/*
* 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.util.ArrayList;
import java.util.List;
/**
* A convenience base class for any {@link FileListFilter} whose criteria can be
* evaluated against each File in isolation. If the entire List of files is
* required for evaluation, implement the FileListFilter interface directly.
*
* @author Mark Fisher
* @author Iwein Fuld
*/
public abstract class AbstractFileListFilter<F> implements FileListFilter<F> {
@Override
public final List<F> filterFiles(F[] files) {
List<F> accepted = new ArrayList<F>();
if (files != null) {
for (F file : files) {
if (this.accept(file)) {
accepted.add(file);
}
}
}
return accepted;
}
/**
* Subclasses must implement this method.
* @param file The file.
* @return true if the file passes the filter.
*/
public abstract boolean accept(F file);
}