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Ant example source code file (RegexpPatternMapper.java)

This example Ant source code file (RegexpPatternMapper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, buildexception, cannot, filenamemapper, noclassdeffounderror, regexpmatcher, regexppatternmapper, regexppatternmapper, string, string, stringbuffer, stringbuffer, util, vector

The RegexpPatternMapper.java source code

/*
 *  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.tools.ant.util;

import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.regexp.RegexpMatcher;
import org.apache.tools.ant.util.regexp.RegexpMatcherFactory;

/**
 * Implementation of FileNameMapper that does regular expression
 * replacements.
 *
 */
public class RegexpPatternMapper implements FileNameMapper {
    // CheckStyle:VisibilityModifier OFF - bc
    protected RegexpMatcher reg = null;
    protected char[] to = null;
    protected StringBuffer result = new StringBuffer();
    // CheckStyle:VisibilityModifier ON

    /**
     * Constructor for RegexpPatternMapper.
     * @throws BuildException on error.
     */
    public RegexpPatternMapper() throws BuildException {
        reg = (new RegexpMatcherFactory()).newRegexpMatcher();
    }

    private boolean handleDirSep = false;
    private int     regexpOptions = 0;

    /**
     * Attribute specifing whether to ignore the difference
     * between / and \ (the two common directory characters).
     * @param handleDirSep a boolean, default is false.
     * @since Ant 1.6.3
     */
    public void setHandleDirSep(boolean handleDirSep) {
        this.handleDirSep = handleDirSep;
    }

    /**
     * Attribute specifing whether to ignore the case difference
     * in the names.
     *
     * @param caseSensitive a boolean, default is false.
     * @since Ant 1.6.3
     */
    public void setCaseSensitive(boolean caseSensitive) {
        if (!caseSensitive) {
            regexpOptions = RegexpMatcher.MATCH_CASE_INSENSITIVE;
        } else {
            regexpOptions = 0;
        }
    }

    /**
     * Sets the "from" pattern. Required.
     * @param from the from pattern.
     * @throws BuildException on error.
     */
    public void setFrom(String from) throws BuildException {
        try {
            reg.setPattern(from);
        } catch (NoClassDefFoundError e) {
            // depending on the implementation the actual RE won't
            // get instantiated in the constructor.
            throw new BuildException("Cannot load regular expression matcher",
                                     e);
        }
    }

    /**
     * Sets the "to" pattern. Required.
     * @param to the to pattern.
     * @throws BuildException on error.
     */
    public void setTo(String to) {
        this.to = to.toCharArray();
    }

    /**
     * Returns null if the source file name doesn't match the
     * "from" pattern, an one-element array containing the
     * translated file otherwise.
     * @param sourceFileName the source file name
     * @return a one-element array containing the translated file or
     *         null if the to pattern did not match
     */
    public String[] mapFileName(String sourceFileName) {
        if (handleDirSep) {
            if (sourceFileName.indexOf("\\") != -1) {
                sourceFileName = sourceFileName.replace('\\', '/');
            }
        }
        if (reg == null  || to == null
            || !reg.matches(sourceFileName, regexpOptions)) {
            return null;
        }
        return new String[] {replaceReferences(sourceFileName)};
    }

    /**
     * Replace all backreferences in the to pattern with the matched
     * groups of the source.
     * @param source the source file name.
     * @return the translated file name.
     */
    protected String replaceReferences(String source) {
        Vector v = reg.getGroups(source, regexpOptions);

        result.setLength(0);
        for (int i = 0; i < to.length; i++) {
            if (to[i] == '\\') {
                if (++i < to.length) {
                    int value = Character.digit(to[i], 10);
                    if (value > -1) {
                        result.append((String) v.elementAt(value));
                    } else {
                        result.append(to[i]);
                    }
                } else {
                    // XXX - should throw an exception instead?
                    result.append('\\');
                }
            } else {
                result.append(to[i]);
            }
        }
        return result.substring(0);
    }

}

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