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INT-4215: Add ChainFileListFilter

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JIRA: https://jira.spring.io/browse/INT-4215
Fixes GH-1998 (https://github.com/spring-projects/spring-integration/issues/1998)

Just make an `CompositeFileListFilter` extension which chains result of the previous filter to the next

**Cherry-pick 4.3.x**
This commit is contained in:
Artem Bilan
2017-01-25 13:00:19 -05:00
committed by Gary Russell
parent eaaa21ef5d
commit d47bca48cc
5 changed files with 95 additions and 6 deletions
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48
spring-integration-file/src/main/java/org/springframework/integration/file/filters/ChainFileListFilter.java Normal file
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@@ -0,0 +1,48 @@
/*
* 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.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.
*
* @author Artem Bilan
*
* @since 4.3.7
*
* @param <F> The type that will be filtered.
*/
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) {
@SuppressWarnings("unchecked")
F[] fileArray = (F[]) leftOver.toArray();
leftOver = fileFilter.filterFiles(fileArray);
}
return leftOver;
}
}

7
spring-integration-file/src/main/java/org/springframework/integration/file/filters/CompositeFileListFilter.java
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@@ -1,5 +1,5 @@
/*
* Copyright 2002-2016 the original author or authors.
* 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.
@@ -32,17 +32,18 @@ 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
*
* @param <F> The type that will be filtered.
*
*/
public class CompositeFileListFilter<F> implements ReversibleFileListFilter<F>, ResettableFileListFilter<F>, Closeable {
private final Set<FileListFilter<F>> fileFilters;
protected final Set<FileListFilter<F>> fileFilters; // NOSONAR
public CompositeFileListFilter() {