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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.Reader;
import java.io.StringReader;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.UnsupportedAttributeException;
import org.apache.tools.ant.filters.util.ChainReaderHelper;
import org.apache.tools.ant.types.FilterChain;
import org.apache.tools.ant.util.FileNameMapper;
import org.apache.tools.ant.util.FileUtils;
/**
* This is a FileNameMapper based on a FilterChain.
*/
public class FilterMapper extends FilterChain implements FileNameMapper {
private static final int BUFFER_SIZE = 8192;
/**
* From attribute not supported.
* @param from a string
* @throws BuildException always
*/
public void setFrom(String from) {
throw new UnsupportedAttributeException(
"filtermapper doesn't support the \"from\" attribute.", "from");
}
/**
* From attribute not supported.
* @param to a string
* @throws BuildException always
*/
public void setTo(String to) {
throw new UnsupportedAttributeException(
"filtermapper doesn't support the \"to\" attribute.", "to");
}
/**
* Return the result of the filters on the sourcefilename.
* @param sourceFileName the filename to map
* @return a one-element array of converted filenames, or null if
* the filterchain returns an empty string.
*/
public String[] mapFileName(String sourceFileName) {
try {
Reader stringReader = new StringReader(sourceFileName);
ChainReaderHelper helper = new ChainReaderHelper();
helper.setBufferSize(BUFFER_SIZE);
helper.setPrimaryReader(stringReader);
helper.setProject(getProject());
Vector<FilterChain> filterChains = new Vector<FilterChain>();
filterChains.add(this);
helper.setFilterChains(filterChains);
String result = FileUtils.safeReadFully(helper.getAssembledReader());
if (result.length() == 0) {
return null;
} else {
return new String[] {result};
}
} catch (BuildException ex) {
throw ex;
} catch (Exception ex) {
throw new BuildException(ex);
}
}
}
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