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Add BoundedCollection collection decorator 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/collections/trunk@131055 13f79535-47bb-0310-9956-ffa450edef68
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Stephen Colebourne 2003-05-09 18:01:08 +00:00
parent ebc5684efd
commit c284d5a192
1 changed files with 142 additions and 0 deletions
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src/java/org/apache/commons/collections/decorators/UnmodifiableBoundedCollection.java Normal file
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/*
* $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//collections/src/java/org/apache/commons/collections/decorators/Attic/UnmodifiableBoundedCollection.java,v 1.1 2003/05/09 18:01:08 scolebourne Exp $
* ====================================================================
*
* The Apache Software License, Version 1.1
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* Copyright (c) 2003 The Apache Software Foundation. All rights
* reserved.
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* modification, are permitted provided that the following conditions
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*/
package org.apache.commons.collections.decorators;
import java.util.Collection;
import org.apache.commons.collections.BoundedCollection;
/**
* <code>UnmodifiableBoundedCollection</code> decorates another <code>BoundedCollection</code>
* to ensure it can't be altered.
* <p>
* If a BoundedCollection is first wrapped in some other collection decorator,
* such as synchronized or predicated, the BoundedCollection nature is lost.
* The factory on this class will attempt to retrieve the bounded nature by
* examining the package scope variables.
*
* @since Commons Collections 3.0
* @version $Revision: 1.1 $ $Date: 2003/05/09 18:01:08 $
*
* @author Stephen Colebourne
*/
public class UnmodifiableBoundedCollection extends UnmodifiableCollection implements BoundedCollection {
/**
* Factory method to create an unmodifiable bounded collection.
*
* @param bag the bag to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
public static BoundedCollection decorate(BoundedCollection coll) {
return new UnmodifiableBoundedCollection(coll);
}
/**
* Factory method to create an unmodifiable bounded collection.
* <p>
* This method is capable of drilling down through other decorators to find
* a suitable BoundedCollection
*
* @param bag the bag to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
public static BoundedCollection decorateUsing(Collection coll) {
if (coll == null) {
throw new IllegalArgumentException("The collection must not be null");
}
// handle decorators
for (int i = 0; i < 1000; i++) { // counter to prevent infinite looping
if (coll instanceof BoundedCollection) {
break; // normal loop exit
} else if (coll instanceof AbstractCollectionDecorator) {
coll = ((AbstractCollectionDecorator) coll).collection;
} else if (coll instanceof SynchronizedCollection) {
coll = ((SynchronizedCollection) coll).collection;
} else {
break; // normal loop exit
}
}
if (coll instanceof BoundedCollection == false) {
throw new IllegalArgumentException("The collection is not a bounded collection");
}
return new UnmodifiableBoundedCollection((BoundedCollection) coll);
}
/**
* Constructor that wraps (not copies).
*
* @param coll the collection to decorate, must not be null
* @throws IllegalArgumentException if bag is null
*/
protected UnmodifiableBoundedCollection(BoundedCollection coll) {
super(coll);
}
//-----------------------------------------------------------------------
public boolean isFull() {
return ((BoundedCollection) collection).isFull();
}
public int maxSize() {
return ((BoundedCollection) collection).maxSize();
}
}