root / tags / v1_0_2_Build_914 / applications / appgvSIG / src / com / vividsolutions / jump / util / CollectionMap.java @ 12200
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/*
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* The Unified Mapping Platform (JUMP) is an extensible, interactive GUI
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* for visualizing and manipulating spatial features with geometry and attributes.
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*
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* Copyright (C) 2003 Vivid Solutions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* For more information, contact:
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*
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* Vivid Solutions
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* Suite #1A
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* 2328 Government Street
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* Victoria BC V8T 5G5
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* Canada
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*
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* (250)385-6040
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* www.vividsolutions.com
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*/
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package com.vividsolutions.jump.util; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.Map; |
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import java.util.Set; |
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import com.vividsolutions.jts.util.Assert; |
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/**
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* A Map whose values are Collections.
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*/
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public class CollectionMap implements Map { |
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private Map map; |
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private Class collectionClass = ArrayList.class; |
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/**
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* Creates a CollectionMap backed by the given Map class.
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* @param mapClass a Class that implements Map
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*/
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public CollectionMap(Class mapClass) { |
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try {
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map = (Map) mapClass.newInstance();
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} catch (InstantiationException e) { |
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Assert.shouldNeverReachHere(); |
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} catch (IllegalAccessException e) { |
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Assert.shouldNeverReachHere(); |
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} |
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} |
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public CollectionMap(Class mapClass, Class collectionClass) { |
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this.collectionClass = collectionClass;
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try {
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map = (Map) mapClass.newInstance();
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} catch (InstantiationException e) { |
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Assert.shouldNeverReachHere(); |
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} catch (IllegalAccessException e) { |
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Assert.shouldNeverReachHere(); |
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} |
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} |
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/**
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* Creates a CollectionMap.
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*/
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public CollectionMap() {
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this(HashMap.class); |
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} |
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private Collection getItemsInternal(Object key) { |
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Collection collection = (Collection) map.get(key); |
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if (collection == null) { |
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try {
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collection = (Collection) collectionClass.newInstance();
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} catch (InstantiationException e) { |
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Assert.shouldNeverReachHere(); |
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} catch (IllegalAccessException e) { |
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Assert.shouldNeverReachHere(); |
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} |
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map.put(key, collection); |
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} |
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return collection;
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} |
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/**
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* Adds the item to the Collection at the given key, creating a new Collection if
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* necessary.
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* @param key the key to the Collection to which the item should be added
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* @param item the item to add
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*/
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public void addItem(Object key, Object item) { |
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getItemsInternal(key).add(item); |
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} |
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public void removeItem(Object key, Object item) { |
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getItemsInternal(key).remove(item); |
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} |
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public void clear() { |
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map.clear(); |
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} |
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/**
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* Adds the items to the Collection at the given key, creating a new Collection if
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* necessary.
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* @param key the key to the Collection to which the items should be added
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* @param items the items to add
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*/
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public void addItems(Object key, Collection items) { |
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for (Iterator i = items.iterator(); i.hasNext();) { |
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addItem(key, i.next()); |
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} |
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} |
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public void addItems(CollectionMap other) { |
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for (Iterator i = other.keySet().iterator(); i.hasNext(); ) { |
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Object key = i.next();
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addItems(key, other.getItems(key)); |
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} |
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} |
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/**
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* Returns the values.
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* @return a view of the values, backed by this CollectionMap
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*/
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public Collection values() { |
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return map.values();
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} |
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/**
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* Returns the keys.
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* @return a view of the keys, backed by this CollectionMap
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*/
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public Set keySet() { |
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return map.keySet();
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} |
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/**
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* Returns the number of mappings.
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* @return the number of key-value pairs
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*/
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public int size() { |
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return map.size();
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} |
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public Object get(Object key) { |
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return getItems(key);
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} |
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public Collection getItems(Object key) { |
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return Collections.unmodifiableCollection(getItemsInternal(key)); |
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} |
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public Object remove(Object key) { |
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return map.remove(key);
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} |
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public boolean containsKey(Object key) { |
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return map.containsKey(key);
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} |
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public boolean containsValue(Object value) { |
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return map.containsValue(value);
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} |
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public Set entrySet() { |
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return map.entrySet();
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} |
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public boolean isEmpty() { |
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return map.isEmpty();
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} |
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public Object put(Object key, Object value) { |
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Assert.isTrue(value instanceof Collection); |
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return map.put(key, value);
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} |
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public void putAll(Map map) { |
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for (Iterator i = map.keySet().iterator(); i.hasNext();) { |
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Object key = i.next();
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//Delegate to #put so that the assertion is made. [Jon Aquino]
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put(key, map.get(key)); |
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} |
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} |
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public void removeItems(Object key, Collection items) { |
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getItemsInternal(key).removeAll(items); |
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} |
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public Map getMap() { |
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return map;
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} |
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} |