org.apache.tools.ant.types.resources.SizeLimitCollection Maven / Gradle / Ivy
/*
* 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
*
* https://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 org.apache.tools.ant.BuildException;
/**
* ResourceCollection that imposes a size limit on another ResourceCollection.
* @since Ant 1.7.1
*/
public abstract class SizeLimitCollection extends BaseResourceCollectionWrapper {
private static final String BAD_COUNT
= "size-limited collection count should be set to an int >= 0";
private int count = 1;
/**
* Set the number of resources to be included.
* @param i the count as int.
*/
public synchronized void setCount(int i) {
checkAttributesAllowed();
count = i;
}
/**
* Get the number of resources to be included. Default is 1.
* @return the count as int.
*/
public synchronized int getCount() {
return count;
}
/**
* Efficient size implementation.
* @return int size
*/
@Override
public synchronized int size() {
return Math.min(getResourceCollection().size(), getValidCount());
}
/**
* Get the count, verifying it is >= 0.
* @return int count
*/
protected int getValidCount() {
int ct = getCount();
if (ct < 0) {
throw new BuildException(BAD_COUNT);
}
return ct;
}
}