/*
* 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.cocoon.util;
/**
* Add-only Container class.
*
* @author <a href="mailto:stefano@apache.org">Stefano Mazzocchi</a>
* @version CVS $Id$
*/
public class ResizableContainer {
private int pointer = -1;
private int size = 0;
private Object[] container;
public ResizableContainer(int initialCapacity){
this.container = new Object[initialCapacity];
}
public void add(Object o) {
set(++pointer,o);
}
public void set(int index, Object o) {
adjustPointer(index);
ensureCapacity(index+1);
container[index] = o;
size++;
}
public Object get(int index) {
return (index < container.length) ? container[index] : null;
}
public int size() {
return size;
}
private void adjustPointer(int newPointer) {
this.pointer = Math.max(this.pointer, newPointer);
}
private void ensureCapacity(int minCapacity) {
int oldCapacity = container.length;
if (oldCapacity < minCapacity) {
Object[] oldContainer = container;
int newCapacity = (oldCapacity * 3)/2 + 1;
if (newCapacity < minCapacity) {
newCapacity = minCapacity;
}
container = new Object[newCapacity];
System.arraycopy(oldContainer, 0, container, 0, oldContainer.length);
}
}
}