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package org.apache.commons.collections.collection;
import java.util.Collection;
import java.util.Iterator;
import org.apache.commons.collections.BoundedCollection;
import org.apache.commons.collections.iterators.UnmodifiableIterator;
/**
* UnmodifiableBoundedCollection
decorates another BoundedCollection
* to ensure it can't be altered.
*
* 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: 1.5 $ $Date: 2004/01/14 21:43:18 $
*
* @author Stephen Colebourne
*/
public final class UnmodifiableBoundedCollection extends AbstractCollectionDecorator implements BoundedCollection {
/**
* Factory method to create an unmodifiable bounded collection.
*
* @param coll the BoundedCollection
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.
*
* This method is capable of drilling down through up to 1000 other decorators
* to find a suitable BoundedCollection.
*
* @param coll the BoundedCollection
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 coll is null
*/
private UnmodifiableBoundedCollection(BoundedCollection coll) {
super(coll);
}
//-----------------------------------------------------------------------
public Iterator iterator() {
return UnmodifiableIterator.decorate(getCollection().iterator());
}
public boolean add(Object object) {
throw new UnsupportedOperationException();
}
public boolean addAll(Collection coll) {
throw new UnsupportedOperationException();
}
public void clear() {
throw new UnsupportedOperationException();
}
public boolean remove(Object object) {
throw new UnsupportedOperationException();
}
public boolean removeAll(Collection coll) {
throw new UnsupportedOperationException();
}
public boolean retainAll(Collection coll) {
throw new UnsupportedOperationException();
}
//-----------------------------------------------------------------------
public boolean isFull() {
return ((BoundedCollection) collection).isFull();
}
public int maxSize() {
return ((BoundedCollection) collection).maxSize();
}
}