/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000,2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Ant", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.tools.ant.util;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.regexp.RegexpMatcher;
import org.apache.tools.ant.util.regexp.RegexpMatcherFactory;
import java.util.Vector;
/**
* Implementation of FileNameMapper that does regular expression
* replacements.
*
* @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
*/
public class RegexpPatternMapper implements FileNameMapper {
protected RegexpMatcher reg = null;
protected char[] to = null;
protected StringBuffer result = new StringBuffer();
public RegexpPatternMapper() throws BuildException {
reg = (new RegexpMatcherFactory()).newRegexpMatcher();
}
/**
* Sets the "from" pattern. Required.
*/
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.
*/
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.
*/
public String[] mapFileName(String sourceFileName) {
if (reg == null || to == null
|| !reg.matches(sourceFileName)) {
return null;
}
return new String[] {replaceReferences(sourceFileName)};
}
/**
* Replace all backreferences in the to pattern with the matched
* groups of the source.
*/
protected String replaceReferences(String source) {
Vector v = reg.getGroups(source);
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.toString();
}
}