/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.xerces.parsers;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Locale;

import org.apache.xerces.impl.Constants;
import org.apache.xerces.impl.XML11DTDScannerImpl;
import org.apache.xerces.impl.XML11DocumentScannerImpl;
import org.apache.xerces.impl.XML11NSDocumentScannerImpl;
import org.apache.xerces.impl.XMLDTDScannerImpl;
import org.apache.xerces.impl.XMLDocumentScannerImpl;
import org.apache.xerces.impl.XMLEntityHandler;
import org.apache.xerces.impl.XMLEntityManager;
import org.apache.xerces.impl.XMLErrorReporter;
import org.apache.xerces.impl.XMLNSDocumentScannerImpl;
import org.apache.xerces.impl.XMLVersionDetector;
import org.apache.xerces.impl.dv.DTDDVFactory;
import org.apache.xerces.impl.msg.XMLMessageFormatter;
import org.apache.xerces.impl.validation.ValidationManager;
import org.apache.xerces.util.ParserConfigurationSettings;
import org.apache.xerces.util.SymbolTable;
import org.apache.xerces.xni.XMLDTDContentModelHandler;
import org.apache.xerces.xni.XMLDTDHandler;
import org.apache.xerces.xni.XMLDocumentHandler;
import org.apache.xerces.xni.XMLLocator;
import org.apache.xerces.xni.XNIException;
import org.apache.xerces.xni.grammars.XMLGrammarPool;
import org.apache.xerces.xni.parser.XMLComponent;
import org.apache.xerces.xni.parser.XMLComponentManager;
import org.apache.xerces.xni.parser.XMLConfigurationException;
import org.apache.xerces.xni.parser.XMLDTDScanner;
import org.apache.xerces.xni.parser.XMLDocumentScanner;
import org.apache.xerces.xni.parser.XMLDocumentSource;
import org.apache.xerces.xni.parser.XMLEntityResolver;
import org.apache.xerces.xni.parser.XMLErrorHandler;
import org.apache.xerces.xni.parser.XMLInputSource;
import org.apache.xerces.xni.parser.XMLPullParserConfiguration;

This class is the non validating parser configuration 
used to parse XML 1.0 and XML 1.1 documents.
Xerces parser that uses this configuration is not conformant 
non-validating XML processor, since conformant non-validating processor is required  
to process "all the declarations they read in the internal DTD subset ... must use the information in those declarations to normalize attribute values, 
include the replacement text of internal entities, and supply default attribute values".
Author:
Elena Litani, IBM, John Kim, IBM, Michael Glavassevich, IBM
Version:
$Id: XML11NonValidatingConfiguration.java 1375061 2012-08-20 15:30:31Z mrglavas $/**
 * This class is the non validating parser configuration 
 * used to parse XML 1.0 and XML 1.1 documents.
 *
 * Xerces parser that uses this configuration is <strong>not</strong> <a href="http://www.w3.org/TR/REC-xml#sec-conformance">conformant</a> 
 * non-validating XML processor, since conformant non-validating processor is required  
 * to process "all the declarations they read in the internal DTD subset ... must use the information in those declarations to normalize attribute values, 
 * include the replacement text of internal entities, and supply default attribute values".

 * @author Elena Litani, IBM
 * @author John Kim, IBM
 * @author Michael Glavassevich, IBM
 *
 * @version $Id: XML11NonValidatingConfiguration.java 1375061 2012-08-20 15:30:31Z mrglavas $
 */
public class XML11NonValidatingConfiguration extends ParserConfigurationSettings
    implements XMLPullParserConfiguration, XML11Configurable {

    //
    // Constants
    //
    protected final static String XML11_DATATYPE_VALIDATOR_FACTORY =
        "org.apache.xerces.impl.dv.dtd.XML11DTDDVFactoryImpl";

    // feature identifiers

    
Feature identifier: validation. /** Feature identifier: validation. */
    protected static final String VALIDATION =
        Constants.SAX_FEATURE_PREFIX + Constants.VALIDATION_FEATURE;
    
    
Feature identifier: namespaces. /** Feature identifier: namespaces. */
    protected static final String NAMESPACES =
        Constants.SAX_FEATURE_PREFIX + Constants.NAMESPACES_FEATURE;
    
    
Feature identifier: external general entities. /** Feature identifier: external general entities. */
    protected static final String EXTERNAL_GENERAL_ENTITIES =
        Constants.SAX_FEATURE_PREFIX + Constants.EXTERNAL_GENERAL_ENTITIES_FEATURE;
    
    
Feature identifier: external parameter entities. /** Feature identifier: external parameter entities. */
    protected static final String EXTERNAL_PARAMETER_ENTITIES =
        Constants.SAX_FEATURE_PREFIX + Constants.EXTERNAL_PARAMETER_ENTITIES_FEATURE;
    
    
    
Feature identifier: continue after fatal error. /** Feature identifier: continue after fatal error. */
    protected static final String CONTINUE_AFTER_FATAL_ERROR =
        Constants.XERCES_FEATURE_PREFIX + Constants.CONTINUE_AFTER_FATAL_ERROR_FEATURE;

   
    // property identifiers

	
Property identifier: xml string. /** Property identifier: xml string. */
	protected static final String XML_STRING = 
		Constants.SAX_PROPERTY_PREFIX + Constants.XML_STRING_PROPERTY;

	
Property identifier: symbol table. /** Property identifier: symbol table. */
	protected static final String SYMBOL_TABLE = 
		Constants.XERCES_PROPERTY_PREFIX + Constants.SYMBOL_TABLE_PROPERTY;

	
Property identifier: error handler. /** Property identifier: error handler. */
	protected static final String ERROR_HANDLER = 
		Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_HANDLER_PROPERTY;

	
Property identifier: entity resolver. /** Property identifier: entity resolver. */
	protected static final String ENTITY_RESOLVER = 
		Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_RESOLVER_PROPERTY;

    
Property identifier: error reporter. /** Property identifier: error reporter. */
    protected static final String ERROR_REPORTER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ERROR_REPORTER_PROPERTY;

    
Property identifier: entity manager. /** Property identifier: entity manager. */
    protected static final String ENTITY_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.ENTITY_MANAGER_PROPERTY;

    
Property identifier document scanner: /** Property identifier document scanner: */
    protected static final String DOCUMENT_SCANNER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.DOCUMENT_SCANNER_PROPERTY;

    
Property identifier: DTD scanner. /** Property identifier: DTD scanner. */
    protected static final String DTD_SCANNER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_SCANNER_PROPERTY;

    
Property identifier: grammar pool. /** Property identifier: grammar pool. */
    protected static final String XMLGRAMMAR_POOL =
        Constants.XERCES_PROPERTY_PREFIX + Constants.XMLGRAMMAR_POOL_PROPERTY;

    
Property identifier: DTD validator. /** Property identifier: DTD validator. */
    protected static final String DTD_VALIDATOR =
        Constants.XERCES_PROPERTY_PREFIX + Constants.DTD_VALIDATOR_PROPERTY;

    
Property identifier: namespace binder. /** Property identifier: namespace binder. */
    protected static final String NAMESPACE_BINDER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.NAMESPACE_BINDER_PROPERTY;

    
Property identifier: datatype validator factory. /** Property identifier: datatype validator factory. */
    protected static final String DATATYPE_VALIDATOR_FACTORY =
        Constants.XERCES_PROPERTY_PREFIX + Constants.DATATYPE_VALIDATOR_FACTORY_PROPERTY;

    protected static final String VALIDATION_MANAGER =
        Constants.XERCES_PROPERTY_PREFIX + Constants.VALIDATION_MANAGER_PROPERTY;

    // debugging

    
Set to true and recompile to print exception stack trace. /** Set to true and recompile to print exception stack trace. */
    protected static final boolean PRINT_EXCEPTION_STACK_TRACE = false;

    // 
    // Data
    //
    protected SymbolTable fSymbolTable;
    protected XMLInputSource fInputSource;
    protected ValidationManager fValidationManager;
    protected XMLVersionDetector fVersionDetector;
    protected XMLLocator fLocator;
    protected Locale fLocale;
    
    
XML 1.0 Components. /** XML 1.0 Components. */
    protected ArrayList fComponents;
    
    
XML 1.1. Components. /** XML 1.1. Components. */
    protected ArrayList fXML11Components = null;
    
    
Common components: XMLEntityManager, XMLErrorReporter /** Common components: XMLEntityManager, XMLErrorReporter */
    protected ArrayList fCommonComponents = null;
    
    
The document handler. /** The document handler. */
    protected XMLDocumentHandler fDocumentHandler;
    
    
The DTD handler. /** The DTD handler. */
    protected XMLDTDHandler fDTDHandler;
    
    
The DTD content model handler. /** The DTD content model handler. */
    protected XMLDTDContentModelHandler fDTDContentModelHandler;
    
    
Last component in the document pipeline /** Last component in the document pipeline */     
    protected XMLDocumentSource fLastComponent;
    
    
True if a parse is in progress. This state is needed because
some features/properties cannot be set while parsing (e.g.
namespaces).
/** 
     * True if a parse is in progress. This state is needed because
     * some features/properties cannot be set while parsing (e.g.
     * namespaces).
     */
    protected boolean fParseInProgress = false;
    
    
fConfigUpdated is set to true if there has been any change to the configuration settings, 
i.e a feature or a property was changed.
/** fConfigUpdated is set to true if there has been any change to the configuration settings, 
     * i.e a feature or a property was changed.
     */
    protected boolean fConfigUpdated = false;
    
    //
    // XML 1.0 components
    //
    
    
The XML 1.0 Datatype validator factory. /** The XML 1.0 Datatype validator factory. */
    protected DTDDVFactory fDatatypeValidatorFactory;
    
    
The XML 1.0 Document scanner that does namespace binding. /** The XML 1.0 Document scanner that does namespace binding. */
    protected XMLNSDocumentScannerImpl fNamespaceScanner;
    
    
The XML 1.0 Non-namespace implementation of scanner /** The XML 1.0 Non-namespace implementation of scanner */
    protected XMLDocumentScannerImpl fNonNSScanner;
    
    
The XML 1.0 DTD scanner. /** The XML 1.0 DTD scanner. */
    protected XMLDTDScanner fDTDScanner;
    
    //
    // XML 1.1 components
    //
    
    
The XML 1.1 datatype factory. /** The XML 1.1 datatype factory. **/
    protected DTDDVFactory fXML11DatatypeFactory = null;
    
    
The XML 1.1 document scanner that does namespace binding. /** The XML 1.1 document scanner that does namespace binding. **/
    protected XML11NSDocumentScannerImpl fXML11NSDocScanner = null;
    
    
The XML 1.1 document scanner that does not do namespace binding. /** The XML 1.1 document scanner that does not do namespace binding. **/
    protected XML11DocumentScannerImpl fXML11DocScanner = null;
    
    
The XML 1.1 DTD scanner. /** The XML 1.1 DTD scanner. **/
    protected XML11DTDScannerImpl fXML11DTDScanner = null;
    
    //
    // Common components
    //
    
    
Grammar pool. /** Grammar pool. */
    protected XMLGrammarPool fGrammarPool;
    
    
Error reporter. /** Error reporter. */
    protected XMLErrorReporter fErrorReporter;
    
    
Entity manager. /** Entity manager. */
    protected XMLEntityManager fEntityManager;
    
    
Current scanner /** Current scanner */
    protected XMLDocumentScanner fCurrentScanner;
    
    
Current Datatype validator factory. /** Current Datatype validator factory. */
    protected DTDDVFactory fCurrentDVFactory;
    
    
Current DTD scanner. /** Current DTD scanner. */
    protected XMLDTDScanner fCurrentDTDScanner;
    
    
    
Flag indiciating whether XML11 components have been initialized. /** Flag indiciating whether XML11 components have been initialized. */
    private boolean f11Initialized = false;

    //
    // Constructors
    //

    
Default constructor. /** Default constructor. */
    public XML11NonValidatingConfiguration() {
        this(null, null, null);
    } // <init>()

    
Constructs a parser configuration using the specified symbol table. 
Params:
symbolTable – The symbol table to use./** 
     * Constructs a parser configuration using the specified symbol table. 
     *
     * @param symbolTable The symbol table to use.
     */
    public XML11NonValidatingConfiguration(SymbolTable symbolTable) {
        this(symbolTable, null, null);
    } // <init>(SymbolTable)

    
Constructs a parser configuration using the specified symbol table and
grammar pool.

REVISIT: 
Grammar pool will be updated when the new validation engine is
implemented.
Params:
symbolTable – The symbol table to use.
grammarPool – The grammar pool to use./**
     * Constructs a parser configuration using the specified symbol table and
     * grammar pool.
     * <p>
     * <strong>REVISIT:</strong> 
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable The symbol table to use.
     * @param grammarPool The grammar pool to use.
     */
    public XML11NonValidatingConfiguration(SymbolTable symbolTable, XMLGrammarPool grammarPool) {
        this(symbolTable, grammarPool, null);
    } // <init>(SymbolTable,XMLGrammarPool)

    
Constructs a parser configuration using the specified symbol table,
grammar pool, and parent settings.

REVISIT: 
Grammar pool will be updated when the new validation engine is
implemented.
Params:
symbolTable –    The symbol table to use.
grammarPool –    The grammar pool to use.
parentSettings – The parent settings./**
     * Constructs a parser configuration using the specified symbol table,
     * grammar pool, and parent settings.
     * <p>
     * <strong>REVISIT:</strong> 
     * Grammar pool will be updated when the new validation engine is
     * implemented.
     *
     * @param symbolTable    The symbol table to use.
     * @param grammarPool    The grammar pool to use.
     * @param parentSettings The parent settings.
     */
    public XML11NonValidatingConfiguration(
        SymbolTable symbolTable,
        XMLGrammarPool grammarPool,
        XMLComponentManager parentSettings) {
		
		super(parentSettings);

		// create a vector to hold all the components in use
		// XML 1.0 specialized components
		fComponents = new ArrayList();
		// XML 1.1 specialized components
		fXML11Components = new ArrayList();
		// Common components for XML 1.1. and XML 1.0
		fCommonComponents = new ArrayList();

		// create storage for recognized features and properties
		fRecognizedFeatures = new ArrayList();
		fRecognizedProperties = new ArrayList();

		// create table for features and properties
		fFeatures = new HashMap();
		fProperties = new HashMap();

        // add default recognized features
        final String[] recognizedFeatures =
            {   
            	CONTINUE_AFTER_FATAL_ERROR, // from XMLDTDScannerImpl
				VALIDATION,                 
				NAMESPACES,
 				EXTERNAL_GENERAL_ENTITIES,  
				EXTERNAL_PARAMETER_ENTITIES,
				PARSER_SETTINGS
			};
        addRecognizedFeatures(recognizedFeatures);
        
		// set state for default features
		fFeatures.put(VALIDATION, Boolean.FALSE);
		fFeatures.put(NAMESPACES, Boolean.TRUE);
		fFeatures.put(EXTERNAL_GENERAL_ENTITIES, Boolean.TRUE);
		fFeatures.put(EXTERNAL_PARAMETER_ENTITIES, Boolean.TRUE);
		fFeatures.put(CONTINUE_AFTER_FATAL_ERROR, Boolean.FALSE);
		fFeatures.put(PARSER_SETTINGS, Boolean.TRUE);

        // add default recognized properties
        final String[] recognizedProperties =
            {				     
                XML_STRING,
                SYMBOL_TABLE,
				ERROR_HANDLER,  
				ENTITY_RESOLVER,
                ERROR_REPORTER,
                ENTITY_MANAGER,
                DOCUMENT_SCANNER,
                DTD_SCANNER,
                DTD_VALIDATOR,
				DATATYPE_VALIDATOR_FACTORY,
				VALIDATION_MANAGER,
				XML_STRING,
                XMLGRAMMAR_POOL, };
        addRecognizedProperties(recognizedProperties);
		
		if (symbolTable == null) {
			symbolTable = new SymbolTable();
		}
		fSymbolTable = symbolTable;
		fProperties.put(SYMBOL_TABLE, fSymbolTable);
		
        fGrammarPool = grammarPool;
        if (fGrammarPool != null) {
			fProperties.put(XMLGRAMMAR_POOL, fGrammarPool);
        }

        fEntityManager = new XMLEntityManager();
		fProperties.put(ENTITY_MANAGER, fEntityManager);
        addCommonComponent(fEntityManager);

        fErrorReporter = new XMLErrorReporter();
        fErrorReporter.setDocumentLocator(fEntityManager.getEntityScanner());
		fProperties.put(ERROR_REPORTER, fErrorReporter);
        addCommonComponent(fErrorReporter);

        fNamespaceScanner = new XMLNSDocumentScannerImpl();
		fProperties.put(DOCUMENT_SCANNER, fNamespaceScanner);
        addComponent((XMLComponent) fNamespaceScanner);

        fDTDScanner = new XMLDTDScannerImpl();
		fProperties.put(DTD_SCANNER, fDTDScanner);
        addComponent((XMLComponent) fDTDScanner);
    
        fDatatypeValidatorFactory = DTDDVFactory.getInstance();
		fProperties.put(DATATYPE_VALIDATOR_FACTORY, fDatatypeValidatorFactory);

        fValidationManager = new ValidationManager();
		fProperties.put(VALIDATION_MANAGER, fValidationManager);
        
        fVersionDetector = new XMLVersionDetector();
        
        // add message formatters
        if (fErrorReporter.getMessageFormatter(XMLMessageFormatter.XML_DOMAIN) == null) {
            XMLMessageFormatter xmft = new XMLMessageFormatter();
            fErrorReporter.putMessageFormatter(XMLMessageFormatter.XML_DOMAIN, xmft);
            fErrorReporter.putMessageFormatter(XMLMessageFormatter.XMLNS_DOMAIN, xmft);
        }

        // set locale
        try {
            setLocale(Locale.getDefault());
        } catch (XNIException e) {
            // do nothing
            // REVISIT: What is the right thing to do? -Ac
        }
        
		fConfigUpdated = false;

    } // <init>(SymbolTable,XMLGrammarPool)

    
Sets the input source for the document to parse.
Params:
inputSource – The document's input source.
Throws:
XMLConfigurationException – Thrown if there is a 
                       configuration error when initializing the
                       parser.
IOException – Thrown on I/O error.
See Also:
parse(boolean)/**
     * Sets the input source for the document to parse.
     *
     * @param inputSource The document's input source.
     *
     * @exception XMLConfigurationException Thrown if there is a 
     *                        configuration error when initializing the
     *                        parser.
     * @exception IOException Thrown on I/O error.
     *
     * @see #parse(boolean)
     */
    public void setInputSource(XMLInputSource inputSource)
        throws XMLConfigurationException, IOException {

        // REVISIT: this method used to reset all the components and
        //          construct the pipeline. Now reset() is called
        //          in parse (boolean) just before we parse the document
        //          Should this method still throw exceptions..?

        fInputSource = inputSource;

    } // setInputSource(XMLInputSource)

    
Set the locale to use for messages.
Params:
locale – The locale object to use for localization of messages.
Throws:
XNIException – Thrown if the parser does not support the
                        specified locale./**
     * Set the locale to use for messages.
     *
     * @param locale The locale object to use for localization of messages.
     *
     * @exception XNIException Thrown if the parser does not support the
     *                         specified locale.
     */
    public void setLocale(Locale locale) throws XNIException {
        fLocale = locale;
        fErrorReporter.setLocale(locale);
    } // setLocale(Locale)
    
	
Sets the document handler on the last component in the pipeline
to receive information about the document.
Params:
documentHandler –   The document handler./**
	 * Sets the document handler on the last component in the pipeline
	 * to receive information about the document.
	 * 
	 * @param documentHandler   The document handler.
	 */
	public void setDocumentHandler(XMLDocumentHandler documentHandler) {
		fDocumentHandler = documentHandler;
		if (fLastComponent != null) {
			fLastComponent.setDocumentHandler(fDocumentHandler);
			if (fDocumentHandler !=null){
				fDocumentHandler.setDocumentSource(fLastComponent);
			}
		}
	} // setDocumentHandler(XMLDocumentHandler)

	
Returns the registered document handler. /** Returns the registered document handler. */
	public XMLDocumentHandler getDocumentHandler() {
		return fDocumentHandler;
	} // getDocumentHandler():XMLDocumentHandler

	
Sets the DTD handler.
Params:
dtdHandler – The DTD handler./**
	 * Sets the DTD handler.
	 * 
	 * @param dtdHandler The DTD handler.
	 */
	public void setDTDHandler(XMLDTDHandler dtdHandler) {
		fDTDHandler = dtdHandler;
	} // setDTDHandler(XMLDTDHandler)

	
Returns the registered DTD handler. /** Returns the registered DTD handler. */
	public XMLDTDHandler getDTDHandler() {
		return fDTDHandler;
	} // getDTDHandler():XMLDTDHandler

	
Sets the DTD content model handler.
Params:
handler – The DTD content model handler./**
	 * Sets the DTD content model handler.
	 * 
	 * @param handler The DTD content model handler.
	 */
	public void setDTDContentModelHandler(XMLDTDContentModelHandler handler) {
		fDTDContentModelHandler = handler;
	} // setDTDContentModelHandler(XMLDTDContentModelHandler)

	
Returns the registered DTD content model handler. /** Returns the registered DTD content model handler. */
	public XMLDTDContentModelHandler getDTDContentModelHandler() {
		return fDTDContentModelHandler;
	} // getDTDContentModelHandler():XMLDTDContentModelHandler

	
Sets the resolver used to resolve external entities. The EntityResolver
interface supports resolution of public and system identifiers.
Params:
resolver – The new entity resolver. Passing a null value will
                uninstall the currently installed resolver./**
	 * Sets the resolver used to resolve external entities. The EntityResolver
	 * interface supports resolution of public and system identifiers.
	 *
	 * @param resolver The new entity resolver. Passing a null value will
	 *                 uninstall the currently installed resolver.
	 */
	public void setEntityResolver(XMLEntityResolver resolver) {
		fProperties.put(ENTITY_RESOLVER, resolver);
	} // setEntityResolver(XMLEntityResolver)

	
Return the current entity resolver.
See Also:
setEntityResolver
Returns:
The current entity resolver, or null if none
        has been registered./**
	 * Return the current entity resolver.
	 *
	 * @return The current entity resolver, or null if none
	 *         has been registered.
	 * @see #setEntityResolver
	 */
	public XMLEntityResolver getEntityResolver() {
		return (XMLEntityResolver)fProperties.get(ENTITY_RESOLVER);
	} // getEntityResolver():XMLEntityResolver
	
	
Allow an application to register an error event handler.
If the application does not register an error handler, all
error events reported by the SAX parser will be silently
ignored; however, normal processing may not continue.  It is
highly recommended that all SAX applications implement an
error handler to avoid unexpected bugs.
Applications may register a new or different handler in the
middle of a parse, and the SAX parser must begin using the new
handler immediately.
Params:
errorHandler – The error handler.
Throws:
NullPointerException – If the handler 
           argument is null.
See Also:
getErrorHandler/**
	 * Allow an application to register an error event handler.
	 *
	 * <p>If the application does not register an error handler, all
	 * error events reported by the SAX parser will be silently
	 * ignored; however, normal processing may not continue.  It is
	 * highly recommended that all SAX applications implement an
	 * error handler to avoid unexpected bugs.</p>
	 *
	 * <p>Applications may register a new or different handler in the
	 * middle of a parse, and the SAX parser must begin using the new
	 * handler immediately.</p>
	 *
	 * @param errorHandler The error handler.
	 * @exception java.lang.NullPointerException If the handler 
	 *            argument is null.
	 * @see #getErrorHandler
	 */
	public void setErrorHandler(XMLErrorHandler errorHandler) {
		fProperties.put(ERROR_HANDLER, errorHandler);
	} // setErrorHandler(XMLErrorHandler)

	
Return the current error handler.
See Also:
setErrorHandler
Returns:
The current error handler, or null if none
        has been registered./**
	 * Return the current error handler.
	 *
	 * @return The current error handler, or null if none
	 *         has been registered.
	 * @see #setErrorHandler
	 */
	public XMLErrorHandler getErrorHandler() {
		// REVISIT: Should this be a property?
		return (XMLErrorHandler)fProperties.get(ERROR_HANDLER);
	} // getErrorHandler():XMLErrorHandler


    
If the application decides to terminate parsing before the xml document
is fully parsed, the application should call this method to free any
resource allocated during parsing. For example, close all opened streams.
/**
     * If the application decides to terminate parsing before the xml document
     * is fully parsed, the application should call this method to free any
     * resource allocated during parsing. For example, close all opened streams.
     */
    public void cleanup() {
        fEntityManager.closeReaders();
    }

    
Parses the specified input source.
Params:
source – The input source.
Throws:
XNIException – Throws exception on XNI error.
IOException – Throws exception on i/o error./**
     * Parses the specified input source.
     *
     * @param source The input source.
     *
     * @exception XNIException Throws exception on XNI error.
     * @exception java.io.IOException Throws exception on i/o error.
     */
    public void parse(XMLInputSource source) throws XNIException, IOException {

        if (fParseInProgress) {
            // REVISIT - need to add new error message
            throw new XNIException("FWK005 parse may not be called while parsing.");
        }
        fParseInProgress = true;

        try {
            setInputSource(source);
            parse(true);
        } catch (XNIException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (IOException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (RuntimeException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (Exception ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw new XNIException(ex);
        } finally {
            fParseInProgress = false;
            // close all streams opened by xerces
            this.cleanup();
        }

    } // parse(InputSource)

    public boolean parse(boolean complete) throws XNIException, IOException {
        //
        // reset and configure pipeline and set InputSource.
        if (fInputSource != null) {
            try {
				fValidationManager.reset();
                fVersionDetector.reset(this);
                resetCommon();

                short version = fVersionDetector.determineDocVersion(fInputSource);
                // XML 1.0
                if (version == Constants.XML_VERSION_1_0) {
                    configurePipeline();
                    reset();
                }
                // XML 1.1
                else if (version == Constants.XML_VERSION_1_1) {
                    initXML11Components();
                    configureXML11Pipeline();
                    resetXML11();
                }
                // Unrecoverable error reported during version detection
                else {
                   return false;
                }
                
                // mark configuration as fixed
                fConfigUpdated = false;

                // resets and sets the pipeline.
                fVersionDetector.startDocumentParsing((XMLEntityHandler) fCurrentScanner, version);
                fInputSource = null;
            } catch (XNIException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } catch (IOException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } catch (RuntimeException ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw ex;
            } catch (Exception ex) {
                if (PRINT_EXCEPTION_STACK_TRACE)
                    ex.printStackTrace();
                throw new XNIException(ex);
            }
        }

        try {
            return fCurrentScanner.scanDocument(complete);
        } catch (XNIException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (IOException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (RuntimeException ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw ex;
        } catch (Exception ex) {
            if (PRINT_EXCEPTION_STACK_TRACE)
                ex.printStackTrace();
            throw new XNIException(ex);
        }

    } // parse(boolean):boolean
    
	
Returns the state of a feature.
Params:
featureId – The feature identifier.
Throws:
XMLConfigurationException – Thrown for configuration error.
                                  In general, components should
                                  only throw this exception if
                                  it is really
                                  a critical error.
Returns:
true if the feature is supported/**
	 * Returns the state of a feature.
	 * 
	 * @param featureId The feature identifier.
		 * @return true if the feature is supported
	 * 
	 * @throws XMLConfigurationException Thrown for configuration error.
	 *                                   In general, components should
	 *                                   only throw this exception if
	 *                                   it is <strong>really</strong>
	 *                                   a critical error.
	 */
	public boolean getFeature(String featureId)
		throws XMLConfigurationException {
			// make this feature special
        if (featureId.equals(PARSER_SETTINGS)){
        	return fConfigUpdated;
        }
        return super.getFeature(featureId);

	} // getFeature(String):boolean
    
	
Set the state of a feature.
Set the state of any feature in a SAX2 parser.  The parser
might not recognize the feature, and if it does recognize
it, it might not be able to fulfill the request.
Params:
featureId – The unique identifier (URI) of the feature.
state – The requested state of the feature (true or false).
Throws:
XMLConfigurationException – If the
           requested feature is not known./**
	 * Set the state of a feature.
	 *
	 * Set the state of any feature in a SAX2 parser.  The parser
	 * might not recognize the feature, and if it does recognize
	 * it, it might not be able to fulfill the request.
	 *
	 * @param featureId The unique identifier (URI) of the feature.
	 * @param state The requested state of the feature (true or false).
	 *
	 * @exception org.apache.xerces.xni.parser.XMLConfigurationException If the
	 *            requested feature is not known.
	 */
	public void setFeature(String featureId, boolean state)
		throws XMLConfigurationException {
		fConfigUpdated = true;
		// forward to every XML 1.0 component
		int count = fComponents.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fComponents.get(i);
			c.setFeature(featureId, state);
		}
		// forward it to common components
		count = fCommonComponents.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fCommonComponents.get(i);
			c.setFeature(featureId, state);
		}
				
		// forward to every XML 1.1 component
		count = fXML11Components.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fXML11Components.get(i);
			try{            
				c.setFeature(featureId, state);
			}
			catch (Exception e){
				// no op
			}
		}
		// save state if noone "objects"
		super.setFeature(featureId, state);

	} // setFeature(String,boolean)
	
	
setProperty
Params:
propertyId – 
value – /**
	 * setProperty
	 * 
	 * @param propertyId 
	 * @param value 
	 */
	public void setProperty(String propertyId, Object value)
		throws XMLConfigurationException {
		fConfigUpdated = true;
		// forward to every XML 1.0 component
		int count = fComponents.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fComponents.get(i);
			c.setProperty(propertyId, value);
		}
		// forward it to every common Component
		count = fCommonComponents.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fCommonComponents.get(i);
			c.setProperty(propertyId, value);
		}
		// forward it to every XML 1.1 component
		count = fXML11Components.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fXML11Components.get(i);
			try{			
				c.setProperty(propertyId, value);
			}
			catch (Exception e){
				// ignore it
			}
		}

		// store value if noone "objects"
		super.setProperty(propertyId, value);

	} // setProperty(String,Object)
    

	
Returns the locale. /** Returns the locale. */
	public Locale getLocale() {
		return fLocale;
	} // getLocale():Locale
	
	
reset all XML 1.0 components before parsing and namespace context
/**
	 * reset all XML 1.0 components before parsing and namespace context
	 */
	protected void reset() throws XNIException {
		int count = fComponents.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fComponents.get(i);
			c.reset(this);
		}

	} // reset()
    
	
reset all common components before parsing
/**
	 * reset all common components before parsing
	 */
	protected void resetCommon() throws XNIException {
		// reset common components
		int count = fCommonComponents.size();
		for (int i = 0; i < count; i++) {
			XMLComponent c = (XMLComponent) fCommonComponents.get(i);
			c.reset(this);
		}

	} // resetCommon()
    
    
	
reset all components before parsing and namespace context
/**
	 * reset all components before parsing and namespace context
	 */
	protected void resetXML11() throws XNIException {
		// reset every component
		int count = fXML11Components.size();
		for (int i = 0; i < count; i++) {			
			XMLComponent c = (XMLComponent) fXML11Components.get(i);
			c.reset(this);
		}

	} // resetXML11()


    
 Configures the XML 1.1 pipeline. 
 Note: this method also resets the new XML11 components.
/**
     *  Configures the XML 1.1 pipeline. 
     *  Note: this method also resets the new XML11 components.
     */
    protected void configureXML11Pipeline() {
        if (fCurrentDVFactory != fXML11DatatypeFactory) {
            fCurrentDVFactory = fXML11DatatypeFactory;
            setProperty(DATATYPE_VALIDATOR_FACTORY, fCurrentDVFactory);
        }
        
        // setup DTD pipeline
        if (fCurrentDTDScanner != fXML11DTDScanner) {
            fCurrentDTDScanner = fXML11DTDScanner;
            setProperty(DTD_SCANNER, fCurrentDTDScanner);
        }
        fXML11DTDScanner.setDTDHandler(fDTDHandler);
        fXML11DTDScanner.setDTDContentModelHandler(fDTDContentModelHandler);

        // setup XML 1.1 document pipeline
        if (fFeatures.get(NAMESPACES) == Boolean.TRUE) {
            if (fCurrentScanner != fXML11NSDocScanner) {
                fCurrentScanner = fXML11NSDocScanner;
                setProperty(DOCUMENT_SCANNER, fXML11NSDocScanner);
            }

            fXML11NSDocScanner.setDTDValidator(null);
            fXML11NSDocScanner.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fXML11NSDocScanner);
            }
            fLastComponent = fXML11NSDocScanner;

        } else {
			// create components
			  if (fXML11DocScanner == null) {
					// non namespace document pipeline
					fXML11DocScanner = new XML11DocumentScannerImpl();
					addXML11Component(fXML11DocScanner);
			  }
            if (fCurrentScanner != fXML11DocScanner) {
                fCurrentScanner = fXML11DocScanner;
                setProperty(DOCUMENT_SCANNER, fXML11DocScanner);
            }
            fXML11DocScanner.setDocumentHandler(fDocumentHandler);

            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fXML11DocScanner);
            }
            fLastComponent = fXML11DocScanner;
        }

    } // configureXML11Pipeline()

    
Configures the pipeline. /** Configures the pipeline. */
    protected void configurePipeline() {
        if (fCurrentDVFactory != fDatatypeValidatorFactory) {
            fCurrentDVFactory = fDatatypeValidatorFactory;
            // use XML 1.0 datatype library
            setProperty(DATATYPE_VALIDATOR_FACTORY, fCurrentDVFactory);
        }

        // setup DTD pipeline
        if (fCurrentDTDScanner != fDTDScanner) {
            fCurrentDTDScanner = fDTDScanner;
            setProperty(DTD_SCANNER, fCurrentDTDScanner);
        }
        fDTDScanner.setDTDHandler(fDTDHandler);
        fDTDScanner.setDTDContentModelHandler(fDTDContentModelHandler);

        // setup document pipeline
        if (fFeatures.get(NAMESPACES) == Boolean.TRUE) {
            if (fCurrentScanner != fNamespaceScanner) {
                fCurrentScanner = fNamespaceScanner;
                setProperty(DOCUMENT_SCANNER, fNamespaceScanner);
            }
            fNamespaceScanner.setDTDValidator(null);
            fNamespaceScanner.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fNamespaceScanner);
            }
            fLastComponent = fNamespaceScanner;
        } else {
            // create components
            if (fNonNSScanner == null) {
                fNonNSScanner = new XMLDocumentScannerImpl();
                // add components
                addComponent((XMLComponent) fNonNSScanner);
              
            }
            if (fCurrentScanner != fNonNSScanner) {
                fCurrentScanner = fNonNSScanner;
                setProperty(DOCUMENT_SCANNER, fNonNSScanner);
    
            }

            fNonNSScanner.setDocumentHandler(fDocumentHandler);
            if (fDocumentHandler != null) {
                fDocumentHandler.setDocumentSource(fNonNSScanner);
            }
            fLastComponent = fNonNSScanner;
        }

    } // configurePipeline()


    // features and properties

    
Check a feature. If feature is know and supported, this method simply
returns. Otherwise, the appropriate exception is thrown.
Params:
featureId – The unique identifier (URI) of the feature.
Throws:
XMLConfigurationException – Thrown for configuration error.
                                  In general, components should
                                  only throw this exception if
                                  it is really
                                  a critical error./**
     * Check a feature. If feature is know and supported, this method simply
     * returns. Otherwise, the appropriate exception is thrown.
     *
     * @param featureId The unique identifier (URI) of the feature.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    protected void checkFeature(String featureId) throws XMLConfigurationException {

        //
        // Xerces Features
        //

        if (featureId.startsWith(Constants.XERCES_FEATURE_PREFIX)) {
            final int suffixLength = featureId.length() - Constants.XERCES_FEATURE_PREFIX.length();
            
            //
            // http://apache.org/xml/features/validation/dynamic
            //   Allows the parser to validate a document only when it
            //   contains a grammar. Validation is turned on/off based
            //   on each document instance, automatically.
            //
            if (suffixLength == Constants.DYNAMIC_VALIDATION_FEATURE.length() && 
                featureId.endsWith(Constants.DYNAMIC_VALIDATION_FEATURE)) {
                return;
            }

            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.DEFAULT_ATTRIBUTE_VALUES_FEATURE.length() &&
                featureId.endsWith(Constants.DEFAULT_ATTRIBUTE_VALUES_FEATURE)) {
                // REVISIT
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.VALIDATE_CONTENT_MODELS_FEATURE.length() && 
                featureId.endsWith(Constants.VALIDATE_CONTENT_MODELS_FEATURE)) {
                // REVISIT
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            //
            // http://apache.org/xml/features/validation/nonvalidating/load-dtd-grammar
            //
            if (suffixLength == Constants.LOAD_DTD_GRAMMAR_FEATURE.length() && 
                featureId.endsWith(Constants.LOAD_DTD_GRAMMAR_FEATURE)) {
                return;
            }
            //
            // http://apache.org/xml/features/validation/nonvalidating/load-external-dtd
            //
            if (suffixLength == Constants.LOAD_EXTERNAL_DTD_FEATURE.length() && 
                featureId.endsWith(Constants.LOAD_EXTERNAL_DTD_FEATURE)) {
                return;
            }

            //
            // http://apache.org/xml/features/validation/default-attribute-values
            //
            if (suffixLength == Constants.VALIDATE_DATATYPES_FEATURE.length() && 
                featureId.endsWith(Constants.VALIDATE_DATATYPES_FEATURE)) {
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
            			 
            // special performance feature: only component manager is allowed to set it.			 
            if (suffixLength == Constants.PARSER_SETTINGS.length() && 
                featureId.endsWith(Constants.PARSER_SETTINGS)) {
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, featureId);
            }
        }

        //
        // Not recognized
        //

        super.checkFeature(featureId);

    } // checkFeature(String)

    
Check a property. If the property is know and supported, this method
simply returns. Otherwise, the appropriate exception is thrown.
Params:
propertyId – The unique identifier (URI) of the property
                  being set.
Throws:
XMLConfigurationException – Thrown for configuration error.
                                  In general, components should
                                  only throw this exception if
                                  it is really
                                  a critical error./**
     * Check a property. If the property is know and supported, this method
     * simply returns. Otherwise, the appropriate exception is thrown.
     *
     * @param propertyId The unique identifier (URI) of the property
     *                   being set.
     *
     * @throws XMLConfigurationException Thrown for configuration error.
     *                                   In general, components should
     *                                   only throw this exception if
     *                                   it is <strong>really</strong>
     *                                   a critical error.
     */
    protected void checkProperty(String propertyId) throws XMLConfigurationException {

        //
        // Xerces Properties
        //

        if (propertyId.startsWith(Constants.XERCES_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.XERCES_PROPERTY_PREFIX.length();

            if (suffixLength == Constants.DTD_SCANNER_PROPERTY.length() && 
                propertyId.endsWith(Constants.DTD_SCANNER_PROPERTY)) {
                return;
            }
        }
        
        if (propertyId.startsWith(Constants.JAXP_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.JAXP_PROPERTY_PREFIX.length();

            if (suffixLength == Constants.SCHEMA_SOURCE.length() && 
                propertyId.endsWith(Constants.SCHEMA_SOURCE)) {
                return;
            }
        }
        
        // special cases
        if (propertyId.startsWith(Constants.SAX_PROPERTY_PREFIX)) {
            final int suffixLength = propertyId.length() - Constants.SAX_PROPERTY_PREFIX.length();
			
            //
            // http://xml.org/sax/properties/xml-string
            // Value type: String
            // Access: read-only
            //   Get the literal string of characters associated with the
            //   current event.  If the parser recognises and supports this
            //   property but is not currently parsing text, it should return
            //   null (this is a good way to check for availability before the
            //   parse begins).
            //
            if (suffixLength == Constants.XML_STRING_PROPERTY.length() && 
                propertyId.endsWith(Constants.XML_STRING_PROPERTY)) {
                // REVISIT - we should probably ask xml-dev for a precise
                // definition of what this is actually supposed to return, and
                // in exactly which circumstances.
                short type = XMLConfigurationException.NOT_SUPPORTED;
                throw new XMLConfigurationException(type, propertyId);
            }
        }

        //
        // Not recognized
        //

        super.checkProperty(propertyId);

    } // checkProperty(String)


    
Adds a component to the parser configuration. This method will
also add all of the component's recognized features and properties
to the list of default recognized features and properties.
Params:
component – The component to add./** 
     * Adds a component to the parser configuration. This method will
     * also add all of the component's recognized features and properties
     * to the list of default recognized features and properties.
     *
     * @param component The component to add.
     */
    protected void addComponent(XMLComponent component) {

        // don't add a component more than once
        if (fComponents.contains(component)) {
            return;
        }
        fComponents.add(component);
        addRecognizedParamsAndSetDefaults(component);
	
    } // addComponent(XMLComponent)
    
    
Adds common component to the parser configuration. This method will
also add all of the component's recognized features and properties
to the list of default recognized features and properties.
Params:
component – The component to add./** 
     * Adds common component to the parser configuration. This method will
     * also add all of the component's recognized features and properties
     * to the list of default recognized features and properties.
     *
     * @param component The component to add.
     */
    protected void addCommonComponent(XMLComponent component) {

        // don't add a component more than once
        if (fCommonComponents.contains(component)) {
            return;
        }
        fCommonComponents.add(component);
        addRecognizedParamsAndSetDefaults(component);

    } // addCommonComponent(XMLComponent)
	
    
Adds an XML 1.1 component to the parser configuration. This method will
also add all of the component's recognized features and properties
to the list of default recognized features and properties.
Params:
component – The component to add./** 
     * Adds an XML 1.1 component to the parser configuration. This method will
     * also add all of the component's recognized features and properties
     * to the list of default recognized features and properties.
     *
     * @param component The component to add.
     */
    protected void addXML11Component(XMLComponent component) {

        // don't add a component more than once
        if (fXML11Components.contains(component)) {
            return;
        }
        fXML11Components.add(component);
        addRecognizedParamsAndSetDefaults(component);
        
    } // addXML11Component(XMLComponent)
    
    
Adds all of the component's recognized features and properties
to the list of default recognized features and properties, and
sets default values on the configuration for features and
properties which were previously absent from the configuration.
Params:
component – The component whose recognized features
and properties will be added to the configuration/**
     * Adds all of the component's recognized features and properties
     * to the list of default recognized features and properties, and
     * sets default values on the configuration for features and
     * properties which were previously absent from the configuration.
     *
     * @param component The component whose recognized features
     * and properties will be added to the configuration
     */
    protected void addRecognizedParamsAndSetDefaults(XMLComponent component) {
        
        // register component's recognized features
        String[] recognizedFeatures = component.getRecognizedFeatures();
        addRecognizedFeatures(recognizedFeatures);
        
        // register component's recognized properties
        String[] recognizedProperties = component.getRecognizedProperties();
        addRecognizedProperties(recognizedProperties);

        // set default values
        if (recognizedFeatures != null) {
            for (int i = 0; i < recognizedFeatures.length; ++i) {
                String featureId = recognizedFeatures[i];
                Boolean state = component.getFeatureDefault(featureId);
                if (state != null) {
                    // Do not overwrite values already set on the configuration.
                    if (!fFeatures.containsKey(featureId)) {
                        fFeatures.put(featureId, state);
                        // For newly added components who recognize this feature
                        // but did not offer a default value, we need to make
                        // sure these components will get an opportunity to read
                        // the value before parsing begins.
                        fConfigUpdated = true;
                    }
                }
            }
        }
        if (recognizedProperties != null) {
            for (int i = 0; i < recognizedProperties.length; ++i) {
                String propertyId = recognizedProperties[i];
                Object value = component.getPropertyDefault(propertyId);
                if (value != null) {
                    // Do not overwrite values already set on the configuration.
                    if (!fProperties.containsKey(propertyId)) {
                        fProperties.put(propertyId, value);
                        // For newly added components who recognize this property
                        // but did not offer a default value, we need to make
                        // sure these components will get an opportunity to read
                        // the value before parsing begins.
                        fConfigUpdated = true;
                    }
                }
            }
        }
    } 

    private void initXML11Components() {
        if (!f11Initialized) {

            // create datatype factory
            fXML11DatatypeFactory = DTDDVFactory.getInstance(XML11_DATATYPE_VALIDATOR_FACTORY);

            // setup XML 1.1 DTD pipeline
            fXML11DTDScanner = new XML11DTDScannerImpl();
            addXML11Component(fXML11DTDScanner);

            // setup XML 1.1. document pipeline - namespace aware
            fXML11NSDocScanner = new XML11NSDocumentScannerImpl();
            addXML11Component(fXML11NSDocScanner);
			
            f11Initialized = true;
        }
    }

} // class XML11NonValidatingConfiguration