Dave Hoover
02899d1083
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6407 542714f4-19e9-0310-aa3c-eee0fc999fb1
116 lines
3.3 KiB
Java
116 lines
3.3 KiB
Java
//
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// $Id$
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//
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// Narya library - tools for developing networked games
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// Copyright (C) 2002-2011 Three Rings Design, Inc., All Rights Reserved
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// http://code.google.com/p/narya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library 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 GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; 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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package com.threerings.util;
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import java.util.HashMap;
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import java.util.Map;
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import java.io.IOException;
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import com.samskivert.annotation.ReplacedBy;
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import com.threerings.io.ObjectInputStream;
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import com.threerings.io.ObjectOutputStream;
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import com.threerings.io.Streamable;
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/**
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* A {@link HashMap} extension that can be streamed. The keys and values in the map must also be
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* of streamable types.
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*
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* @see Streamable
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* @param <K> the type of key stored in this map.
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* @param <V> the type of value stored in this map.
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*/
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@ReplacedBy("java.util.Map")
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public class StreamableHashMap<K, V> extends HashMap<K, V>
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implements Streamable
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{
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/**
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* Creates an empty StreamableHashMap.
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*/
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public static <K, V> StreamableHashMap<K, V> newMap ()
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{
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return new StreamableHashMap<K, V>();
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}
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/**
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* Creates StreamableHashMap populated with the same values as the provided Map.
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*/
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public static <K, V> StreamableHashMap<K, V> newMap (Map<? extends K, ? extends V> map)
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{
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return new StreamableHashMap<K, V>(map);
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}
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/**
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* Constructs an empty hash map with the specified number of hash buckets.
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*/
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public StreamableHashMap (int buckets, float loadFactor)
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{
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super(buckets, loadFactor);
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}
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/**
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* Constructs an empty hash map with the default number of hash buckets.
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*/
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public StreamableHashMap ()
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{
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super();
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}
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/**
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* Constructs a hash map with the default number of hash buckets, populated with the same
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* values as the provided Map.
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*/
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public StreamableHashMap (Map<? extends K, ? extends V> map)
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{
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super(map);
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}
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/**
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* Writes our custom streamable fields.
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*/
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public void writeObject (ObjectOutputStream out)
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throws IOException
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{
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int ecount = size();
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out.writeInt(ecount);
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for (Map.Entry<K, V> entry : entrySet()) {
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out.writeObject(entry.getKey());
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out.writeObject(entry.getValue());
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}
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}
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/**
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* Reads our custom streamable fields.
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*/
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public void readObject (ObjectInputStream in)
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throws IOException, ClassNotFoundException
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{
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int ecount = in.readInt();
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for (int ii = 0; ii < ecount; ii++) {
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@SuppressWarnings("unchecked") K key = (K)in.readObject();
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@SuppressWarnings("unchecked") V value = (V)in.readObject();
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put(key, value);
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}
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}
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}
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