memorycache.java

来自「Sony Ericsson手机上的Facebook客户端全套代码」· Java 代码 · 共 111 行

// Decompiled by Jad v1.5.7g. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3) 
// Source File Name:   MemoryCache.java

package se.southend.drops.cache;

import java.util.Hashtable;
import java.util.Vector;

// Referenced classes of package se.southend.drops.cache:
//            Cache, CacheInfo

public class MemoryCache
    implements Cache
{
    private class Entry
    {

        CacheInfo info;
        byte data[];

        Entry(CacheInfo info, byte data[])
        {
            this.info = info;
            this.data = data;
        }
    }


    public MemoryCache()
    {
        cache = new Hashtable();
        keys = new Vector();
    }

    public static MemoryCache getInstance()
    {
        if(instance == null)
            instance = new MemoryCache();
        return instance;
    }

    public byte[] get(String key)
    {
        Entry entry = (Entry)cache.get(key);
        return entry != null ? entry.data : null;
    }

    public CacheInfo getInfo(String key)
    {
        Entry entry = (Entry)cache.get(key);
        return entry != null ? entry.info : null;
    }

    public void put(String key, byte data[])
    {
        put(key, null, data);
    }

    public void put(String key, CacheInfo info, byte data[])
    {
        Entry entry = new Entry(info, data);
        size += data.length;
        cache.put(key, entry);
        keys.addElement(key);
    }

    public void remove(String key)
    {
        size -= ((byte[])((Entry)cache.get(key)).data).length;
        cache.remove(key);
        keys.removeElement(key);
    }

    public void empty()
    {
        size = 0;
        cache.clear();
        keys.removeAllElements();
    }

    public boolean contains(String key)
    {
        return cache.containsKey(key);
    }

    public String[] contents()
    {
        String contents[] = new String[keys.size()];
        keys.copyInto(contents);
        return contents;
    }

    public int size()
    {
        return size;
    }

    public void close()
    {
        cache.clear();
        keys.removeAllElements();
    }

    private static MemoryCache instance;
    private Hashtable cache;
    private Vector keys;
    private int size;
}