https://ant.apache.org/: master POM (The 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
 *
 *      https://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.tools.ant.filters;

import java.io.IOException;
import java.io.Reader;
import java.util.Vector;

import org.apache.tools.ant.Project;
import org.apache.tools.ant.types.Parameter;


Filter which includes only those lines that contain the user-specified
strings.
Example:

<linecontains>
  <contains value="foo">
  <contains value="bar">
</linecontains>

Or:

<filterreader classname="org.apache.tools.ant.filters.LineContains">
   <param type="contains" value="foo"/>
   <param type="contains" value="bar"/>
</filterreader>

This will include only those lines that contain foo and
bar. Starting Ant 1.10.4, the matchAny attribute can be used to control whether any one of the user-specified strings is expected to be contained in the line or all of them are expected to be contained. For example: 
<linecontains matchAny="true">
 *   <contains value="foo">
 *   <contains value="bar">
 * </linecontains>

This will include only those lines that contain either foo or bar.

/**
 * Filter which includes only those lines that contain the user-specified
 * strings.
 *
 * Example:
 *
 * <pre>&lt;linecontains&gt;
 *   &lt;contains value=&quot;foo&quot;&gt;
 *   &lt;contains value=&quot;bar&quot;&gt;
 * &lt;/linecontains&gt;</pre>
 *
 * Or:
 *
 * <pre>&lt;filterreader classname=&quot;org.apache.tools.ant.filters.LineContains&quot;&gt;
 *    &lt;param type=&quot;contains&quot; value=&quot;foo&quot;/&gt;
 *    &lt;param type=&quot;contains&quot; value=&quot;bar&quot;/&gt;
 * &lt;/filterreader&gt;</pre>
 *
 * This will include only those lines that contain <code>foo</code> and
 * <code>bar</code>.
 *
 * Starting Ant 1.10.4, the {@code matchAny} attribute can be used to control whether any one
 * of the user-specified strings is expected to be contained in the line or all
 * of them are expected to be contained.
 *
 * For example:
 *
 * <pre>&lt;linecontains matchAny=&quot;true&quot;&gt;
 *  *   &lt;contains value=&quot;foo&quot;&gt;
 *  *   &lt;contains value=&quot;bar&quot;&gt;
 *  * &lt;/linecontains&gt;</pre>
 *
 * This will include only those lines that contain either <code>foo</code> or <code>bar</code>.
 *
 */
public final class LineContains
    extends BaseParamFilterReader
    implements ChainableReader {
    
Parameter name for the words to filter on. 
/** Parameter name for the words to filter on. */
    private static final String CONTAINS_KEY = "contains";

    
Parameter name for the words to filter on. 
/** Parameter name for the words to filter on. */
    private static final String NEGATE_KEY = "negate";

    
Vector that holds the strings that input lines must contain. 
/** Vector that holds the strings that input lines must contain. */
    private Vector<String> contains = new Vector<>();

    
Remaining line to be read from this filter, or null if
the next call to read() should read the original stream
to find the next matching line.

/**
     * Remaining line to be read from this filter, or <code>null</code> if
     * the next call to <code>read()</code> should read the original stream
     * to find the next matching line.
     */
    private String line = null;

    private boolean negate = false;

    private boolean matchAny = false;

    
Constructor for "dummy" instances.

See Also:
  • BaseFilterReader.BaseFilterReader()
/**
     * Constructor for "dummy" instances.
     *
     * @see BaseFilterReader#BaseFilterReader()
     */
    public LineContains() {
        super();
    }

    
Creates a new filtered reader.

Params:
  • in – A Reader object providing the underlying stream.
          Must not be null.
/**
     * Creates a new filtered reader.
     *
     * @param in A Reader object providing the underlying stream.
     *           Must not be <code>null</code>.
     */
    public LineContains(final Reader in) {
        super(in);
    }

    
Returns the next character in the filtered stream, only including
lines from the original stream which contain all of the specified words.

Throws:
  • IOException – if the underlying stream throws an IOException
during reading
Returns:the next character in the resulting stream, or -1
if the end of the resulting stream has been reached
/**
     * Returns the next character in the filtered stream, only including
     * lines from the original stream which contain all of the specified words.
     *
     * @return the next character in the resulting stream, or -1
     * if the end of the resulting stream has been reached
     *
     * @exception IOException if the underlying stream throws an IOException
     * during reading
     */
    public int read() throws IOException {
        if (!getInitialized()) {
            initialize();
            setInitialized(true);
        }

        int ch = -1;

        if (line != null) {
            ch = line.charAt(0);
            if (line.length() == 1) {
                line = null;
            } else {
                line = line.substring(1);
            }
        } else {
            final int containsSize = contains.size();

            for (line = readLine(); line != null; line = readLine()) {
                boolean matches = true;
                for (int i = 0; i < containsSize; i++) {
                    final String containsStr = contains.elementAt(i);
                    matches = line.contains(containsStr);
                    if (!matches) {
                        if (this.matchAny) {
                            // this one didn't match, but we are expected to have
                            // any one of them match. so try next
                            continue;
                        } else {
                            // all were expected to match, but this one didn't.
                            // so no point checking the rest
                            break;
                        }
                    } else if (this.matchAny) {
                        // we were expected to match any of the contains
                        // and this one did. so no more checks needed
                        break;
                    }
                }
                if (matches ^ isNegated()) {
                    break;
                }
            }
            if (line != null) {
                return read();
            }
        }
        return ch;
    }

    
Adds a contains element.

Params:
  • contains – The contains element to add.
                Must not be null.
/**
     * Adds a <code>contains</code> element.
     *
     * @param contains The <code>contains</code> element to add.
     *                 Must not be <code>null</code>.
     */
    public void addConfiguredContains(final Contains contains) {
        this.contains.addElement(contains.getValue());
    }

    
Set the negation mode.  Default false (no negation).

Params:
  • b – the boolean negation mode to set.
/**
     * Set the negation mode.  Default false (no negation).
     * @param b the boolean negation mode to set.
     */
    public void setNegate(boolean b) {
        negate = b;
    }

    
Find out whether we have been negated.

Returns:boolean negation flag.
/**
     * Find out whether we have been negated.
     * @return boolean negation flag.
     */
    public boolean isNegated() {
        return negate;
    }

    
Params:
  • matchAny – True if this LineContains is considered a match, if any of the contains value match. False if all of the contains value are expected to match
Since:Ant 1.10.4
/**
     *
     * @param matchAny True if this {@link LineContains} is considered a match,
     *                 if {@code any} of the {@code contains} value match. False
     *                 if {@code all} of the {@code contains} value are expected
     *                 to match
     * @since Ant 1.10.4
     *
     */
    public void setMatchAny(final boolean matchAny) {
        this.matchAny = matchAny;
    }

    
Returns:Returns true if this LineContains is considered a match, if any of the contains value match. False if all of the contains value are expected to match
Since:Ant 1.10.4
/**
     * @return Returns true if this {@link LineContains} is considered a match,
     * if {@code any} of the {@code contains} value match. False
     * if {@code all} of the {@code contains} value are expected
     * to match
     *
     * @since Ant 1.10.4
     */
    public boolean isMatchAny() {
        return this.matchAny;
    }

    
Sets the vector of words which must be contained within a line read
from the original stream in order for it to match this filter.

Params:
  • contains – A vector of words which must be contained within a line
in order for it to match in this filter. Must not be null.
/**
     * Sets the vector of words which must be contained within a line read
     * from the original stream in order for it to match this filter.
     *
     * @param contains A vector of words which must be contained within a line
     * in order for it to match in this filter. Must not be <code>null</code>.
     */
    private void setContains(final Vector<String> contains) {
        this.contains = contains;
    }

    
Returns the vector of words which must be contained within a line read
from the original stream in order for it to match this filter.

Returns:the vector of words which must be contained within a line read
from the original stream in order for it to match this filter. The
returned object is "live" - in other words, changes made to the
returned object are mirrored in the filter.
/**
     * Returns the vector of words which must be contained within a line read
     * from the original stream in order for it to match this filter.
     *
     * @return the vector of words which must be contained within a line read
     * from the original stream in order for it to match this filter. The
     * returned object is "live" - in other words, changes made to the
     * returned object are mirrored in the filter.
     */
    private Vector<String> getContains() {
        return contains;
    }

    
Creates a new LineContains using the passed in
Reader for instantiation.

Params:
  • rdr – A Reader object providing the underlying stream.
           Must not be null.
Returns:a new filter based on this configuration, but filtering
        the specified reader
/**
     * Creates a new LineContains using the passed in
     * Reader for instantiation.
     *
     * @param rdr A Reader object providing the underlying stream.
     *            Must not be <code>null</code>.
     *
     * @return a new filter based on this configuration, but filtering
     *         the specified reader
     */
    public Reader chain(final Reader rdr) {
        LineContains newFilter = new LineContains(rdr);
        newFilter.setContains(getContains());
        newFilter.setNegate(isNegated());
        newFilter.setMatchAny(isMatchAny());
        return newFilter;
    }

    
Parses the parameters to add user-defined contains strings.

/**
     * Parses the parameters to add user-defined contains strings.
     */
    private void initialize() {
        Parameter[] params = getParameters();
        if (params != null) {
            for (Parameter param : params) {
                if (CONTAINS_KEY.equals(param.getType())) {
                    contains.addElement(param.getValue());
                } else if (NEGATE_KEY.equals(param.getType())) {
                    setNegate(Project.toBoolean(param.getValue()));
                }
            }
        }
    }

    
Holds a contains element

/**
     * Holds a contains element
     */
    public static class Contains {

        
User defined contains string 
/** User defined contains string */
        private String value;

        
Sets the contains string

Params:
  • contains – The contains string to set.
                Must not be null.
/**
         * Sets the contains string
         *
         * @param contains The contains string to set.
         *                 Must not be <code>null</code>.
         */
        public final void setValue(String contains) {
            value = contains;
        }

        
Returns the contains string.

Returns:the contains string for this element
/**
         * Returns the contains string.
         *
         * @return the contains string for this element
         */
        public final String getValue() {
            return value;
        }
    }
}