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/*
* 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.types.mappers;
import java.io.File;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.FileNameMapper;
/**
* A mapper that strips of the a configurable number of leading
* directories from a file name.
*
* <p>This mapper was inspired by a user-list thread that mentioned
* wget's --cut-dirs option.</p>
*
* @see <a href="http://mail-archives.apache.org/mod_mbox/ant-user/201009.mbox/%3C51772743BEA5D44A9EA5BF52AADDD6FB010E96F6@hammai008.delphi.local%3E">
* simplify copy with regexpmapper</a>
*/
public class CutDirsMapper implements FileNameMapper {
private int dirs = 0;
/**
* The number of leading directories to cut.
*/
public void setDirs(final int dirs) {
this.dirs = dirs;
}
/**
* Empty implementation.
* @param ignore ignored.
*/
public void setFrom(final String ignore) {
}
/**
* Empty implementation.
* @param ignore ignored.
*/
public void setTo(final String ignore) {
}
/** {@inheritDoc}. */
public String[] mapFileName(final String sourceFileName) {
if (dirs <= 0) {
throw new BuildException("dirs must be set to a positive number");
}
final char fileSep = File.separatorChar;
final String fileSepCorrected =
sourceFileName.replace('/', fileSep).replace('\\', fileSep);
int nthMatch = fileSepCorrected.indexOf(fileSep);
for (int n = 1; nthMatch > -1 && n < dirs; n++) {
nthMatch = fileSepCorrected.indexOf(fileSep, nthMatch + 1);
}
if (nthMatch == -1) {
return null;
}
return new String[] {sourceFileName.substring(nthMatch + 1)};
}
}
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