/*
* Copyright 2017 the original author or authors.
*
* Licensed 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.springframework.integration.file.filters;
import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.List;
import org.springframework.util.Assert;
/**
* The {@link CompositeFileListFilter} extension which chains the result
* of the previous filter to the next one. If a filter in the chain returns
* an empty list, the remaining filters are not invoked.
*
* @param <F> The type that will be filtered.
*
* @author Artem Bilan
* @author Gary Russell
*
* @since 4.3.7
*
*/
public class ChainFileListFilter<F> extends CompositeFileListFilter<F> {
@Override
public List<F> filterFiles(F[] files) {
Assert.notNull(files, "'files' should not be null");
List<F> leftOver = Arrays.asList(files);
for (FileListFilter<F> fileFilter : this.fileFilters) {
if (leftOver.size() == 0) {
break;
}
@SuppressWarnings("unchecked")
F[] fileArray = leftOver.toArray((F[]) Array.newInstance(leftOver.get(0).getClass(), leftOver.size()));
leftOver = fileFilter.filterFiles(fileArray);
}
return leftOver;
}
}