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The source code/* * Sun Public License Notice * * The contents of this file are subject to the Sun Public License * Version 1.0 (the "License"). You may not use this file except in * compliance with the License. A copy of the License is available at * http://www.sun.com/ * * The Original Code is NetBeans. The Initial Developer of the Original * Code is Sun Microsystems, Inc. Portions Copyright 1997-2001 Sun * Microsystems, Inc. All Rights Reserved. */ package org.netbeans.mdr.persistence.btreeimpl.btreeindex; import org.netbeans.mdr.persistence.*; import java.io.*; import java.util.*; /** * This is the read-only Collection interface to the set of values contained * in a SinglevaluedBtree. * * @author Dana Bergen * @version 1.0 */ public class BtreeCollection extends AbstractCollection { protected Btree btree; /** * Construct a Collection view of a btree. * * @param btree the btree */ public BtreeCollection(Btree btree) { this.btree = btree; } /** * Returns the number of items in this btree */ public int size() { try { btree.beginRead(); return btree.countRecords(); } catch (StorageException e) { } finally { btree.endRead(); } return 0; } public boolean isEmpty() { return !iterator().hasNext(); } /** * Returns an iterator on this BtreeCollection */ public Iterator iterator() { return new BtreeIterator(btree); } } |
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