| /****************************************************************************** |
| * Copyright (c) 2010 Oracle |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Konstantin Komissarchik - initial implementation and ongoing maintenance |
| ******************************************************************************/ |
| |
| package org.eclipse.wst.common.project.facet.core.util.internal; |
| |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a> |
| */ |
| |
| public final class IndexedSet<K,V> |
| { |
| private final Set<V> set; |
| private final Set<V> unmodifiable; |
| private final Map<K,V> index; |
| |
| public IndexedSet() |
| { |
| this.set = new HashSet<V>(); |
| this.unmodifiable = Collections.unmodifiableSet( this.set ); |
| this.index = new HashMap<K,V>(); |
| } |
| |
| public Set<V> getItemSet() |
| { |
| return this.unmodifiable; |
| } |
| |
| public V getItemByKey( final K key ) |
| { |
| return this.index.get( key ); |
| } |
| |
| public boolean containsKey( final K key ) |
| { |
| return this.index.containsKey( key ); |
| } |
| |
| public boolean containsItem( final V item ) |
| { |
| return this.set.contains( item ); |
| } |
| |
| public void addItem( final V item ) |
| { |
| if( item == null ) |
| { |
| throw new IllegalArgumentException(); |
| } |
| |
| this.set.add( item ); |
| } |
| |
| public void addItemWithKey( final K key, |
| final V item ) |
| { |
| addItem( item ); |
| addKey( key, item ); |
| } |
| |
| public void addKey( final K key, |
| final V item ) |
| { |
| if( key == null || item == null ) |
| { |
| throw new IllegalArgumentException(); |
| } |
| |
| if( ! this.set.contains( item ) ) |
| { |
| throw new IllegalArgumentException(); |
| } |
| |
| this.index.put( key, item ); |
| } |
| |
| public boolean removeItem( final V item ) |
| { |
| if( this.set.remove( item ) ) |
| { |
| for( Iterator<Map.Entry<K,V>> itr = this.index.entrySet().iterator(); itr.hasNext(); ) |
| { |
| final Map.Entry<K,V> entry = itr.next(); |
| |
| if( entry.getValue() == item ) |
| { |
| itr.remove(); |
| } |
| } |
| |
| return true; |
| } |
| |
| return false; |
| } |
| |
| public boolean removeItemByKey( final K key ) |
| { |
| final V item = this.index.get( key ); |
| |
| if( item != null ) |
| { |
| return removeItem( item ); |
| } |
| |
| return false; |
| } |
| |
| } |