org.apache.tools.ant.util.ChainedMapper Maven / Gradle / Ivy
/*
* 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.Objects;
import java.util.stream.Stream;
/**
* A ContainerMapper that chains the results of the first
* nested FileNameMappers into sourcefiles for the second,
* the second to the third, and so on, returning the resulting mapped
* filenames from the last nested FileNameMapper.
*/
public class ChainedMapper extends ContainerMapper {
/** {@inheritDoc}. */
@Override
public String[] mapFileName(String sourceFileName) {
// we invoke the chain even if the sourceFileName is null. Some
// resources have a null name and users may use a mapper like
// MergeMapper to provide a name for it.
String[] result = getMappers().stream()
.filter(Objects::nonNull)
.reduce(new String[] { sourceFileName }, (i, m) -> Stream.of(i)
.map(m::mapFileName).filter(Objects::nonNull).flatMap(Stream::of).toArray(String[]::new),
(i, o) -> o);
return result == null || result.length == 0 ? null : result;
}
}