http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * 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.
 */

/* $Id: ServletContextURIResolver.java 679326 2008-07-24 09:35:34Z vhennebert $ */

package org.apache.fop.servlet;

import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import javax.servlet.ServletContext;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.stream.StreamSource;


This class is a URIResolver implementation that provides access to resources in the WEB-INF
directory of a web application using "servlet-content:" URIs.

/**
 * This class is a URIResolver implementation that provides access to resources in the WEB-INF
 * directory of a web application using "servlet-content:" URIs.
 */
public class ServletContextURIResolver implements URIResolver {

    
The protocol name for the servlet context URIs. 
/** The protocol name for the servlet context URIs. */
    public static final String SERVLET_CONTEXT_PROTOCOL = "servlet-context:";

    private ServletContext servletContext;

    
Main constructor

Params:
  • servletContext – the servlet context to access the resources through
/**
     * Main constructor
     * @param servletContext the servlet context to access the resources through
     */
    public ServletContextURIResolver(ServletContext servletContext) {
        this.servletContext = servletContext;
    }

    
{@inheritDoc} 
/** {@inheritDoc} */
    public Source resolve(String href, String base) throws TransformerException {
        if (href.startsWith(SERVLET_CONTEXT_PROTOCOL)) {
            return resolveServletContextURI(href.substring(SERVLET_CONTEXT_PROTOCOL.length()));
        } else {
            if (base != null
                    && base.startsWith(SERVLET_CONTEXT_PROTOCOL)
                    && (href.indexOf(':') < 0)) {
                String abs = base + href;
                return resolveServletContextURI(
                        abs.substring(SERVLET_CONTEXT_PROTOCOL.length()));
            } else {
                return null;
            }
        }
    }

    
Resolves the "servlet-context:" URI.

Params:
  • path – the path part after the protocol (should start with a "/")
Throws:
Returns:the resolved Source or null if the resource was not found
/**
     * Resolves the "servlet-context:" URI.
     * @param path the path part after the protocol (should start with a "/")
     * @return the resolved Source or null if the resource was not found
     * @throws TransformerException if no URL can be constructed from the path
     */
    protected Source resolveServletContextURI(String path) throws TransformerException {
        while (path.startsWith("//")) {
            path = path.substring(1);
        }
        try {
            URL url = this.servletContext.getResource(path);
            InputStream in = this.servletContext.getResourceAsStream(path);
            if (in != null) {
                if (url != null) {
                    return new StreamSource(in, url.toExternalForm());
                } else {
                    return new StreamSource(in);
                }
            } else {
                throw new TransformerException("Resource does not exist. \"" + path
                        + "\" is not accessible through the servlet context.");
            }
        } catch (MalformedURLException mfue) {
            throw new TransformerException(
                    "Error accessing resource using servlet context: " + path, mfue);
        }
    }
}