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/*
* 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.types.resources;
import java.util.Collection;
import java.util.List;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.util.CollectionUtils;
/**
* ResourceCollection that contains all resources of another
* collection except for the last <code>count</code> elements, a la
* the UNIX head command with parameter <code>-n -count</code>.
* @since Ant 1.9.5
*/
public class AllButLast extends SizeLimitCollection {
/**
* Take all elements except for the last <code>count</code> elements.
* @return a Collection of Resources.
*/
protected Collection<Resource> getCollection() {
int ct = getValidCount();
List<Resource> result =
(List<Resource>) CollectionUtils.asCollection(getResourceCollection()
.iterator());
return result.subList(0, result.size() - ct);
}
@Override
public synchronized int size() {
int sz = getResourceCollection().size();
int ct = getValidCount();
return sz > ct ? sz - ct : 0;
}
}
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