/*
* Copyright 2002-2017 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.io.Closeable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
/**
* Simple {@link FileListFilter} that predicates its matches against <b>all</b> of the
* configured {@link FileListFilter}.
* @param <F> The type that will be filtered.
*
* @author Iwein Fuld
* @author Josh Long
* @author Gary Russell
* @author Artem Bilan
*
*
*/
public class CompositeFileListFilter<F> implements ReversibleFileListFilter<F>, ResettableFileListFilter<F>, Closeable {
protected final Set<FileListFilter<F>> fileFilters; // NOSONAR
public CompositeFileListFilter() {
this.fileFilters = new LinkedHashSet<FileListFilter<F>>();
}
public CompositeFileListFilter(Collection<? extends FileListFilter<F>> fileFilters) {
this.fileFilters = new LinkedHashSet<FileListFilter<F>>(fileFilters);
}
@Override
public void close() throws IOException {
for (FileListFilter<F> filter : this.fileFilters) {
if (filter instanceof Closeable) {
((Closeable) filter).close();
}
}
}
public CompositeFileListFilter<F> addFilter(FileListFilter<F> filter) {
return this.addFilters(Collections.singletonList(filter));
}
/**
* @param filters one or more new filters to add
* @return this CompositeFileFilter instance with the added filters
* @see #addFilters(Collection)
*/
@SuppressWarnings("unchecked") //For JDK7
public CompositeFileListFilter<F> addFilters(FileListFilter<F>... filters) {
return addFilters(Arrays.asList(filters));
}
/**
* Not thread safe. Only a single thread may add filters at a time.
* <p>
* Add the new filters to this CompositeFileListFilter while maintaining the existing filters.
*
* @param filtersToAdd a list of filters to add
* @return this CompositeFileListFilter instance with the added filters
*/
public CompositeFileListFilter<F> addFilters(Collection<? extends FileListFilter<F>> filtersToAdd) {
for (FileListFilter<? extends F> elf : filtersToAdd) {
if (elf instanceof InitializingBean) {
try {
((InitializingBean) elf).afterPropertiesSet();
}
catch (Exception e) {
throw new RuntimeException(e);
}
}
}
this.fileFilters.addAll(filtersToAdd);
return this;
}
@Override
public List<F> filterFiles(F[] files) {
Assert.notNull(files, "'files' should not be null");
List<F> results = new ArrayList<F>(Arrays.asList(files));
for (FileListFilter<F> fileFilter : this.fileFilters) {
List<F> currentResults = fileFilter.filterFiles(files);
results.retainAll(currentResults);
}
return results;
}
@Override
public void rollback(F file, List<F> files) {
for (FileListFilter<F> fileFilter : this.fileFilters) {
if (fileFilter instanceof ReversibleFileListFilter) {
((ReversibleFileListFilter<F>) fileFilter).rollback(file, files);
}
}
}
@Override
public boolean remove(F f) {
boolean removed = false;
for (FileListFilter<F> fileFilter : this.fileFilters) {
if (fileFilter instanceof ResettableFileListFilter) {
((ResettableFileListFilter<F>) fileFilter).remove(f);
removed = true;
}
}
return removed;
}
}