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Jetty example source code file (BufferCache.java)

This example Jetty source code file (BufferCache.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Jetty tags/keywords

arraylist, buffer, buffer, buffercache, cache, cachedbuffer, cachedbuffer, entry, hashmap, hashmap, string, string, stringmap, util

The Jetty BufferCache.java source code

// ========================================================================
// Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.mortbay.io;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;

import org.mortbay.util.StringMap;

/* ------------------------------------------------------------------------------- */
/** 
 * Stores a collection of {@link Buffer} objects.
 * Buffers are stored in an ordered collection and can retreived by index or value
 * @author gregw
 */
public class BufferCache
{
    private HashMap _bufferMap=new HashMap();
    private StringMap _stringMap=new StringMap(StringMap.CASE_INSENSTIVE);
    private ArrayList _index= new ArrayList();

    /* ------------------------------------------------------------------------------- */
    /** Add a buffer to the cache at the specified index.
     * @param value The content of the buffer.
     */
    public CachedBuffer add(String value, int ordinal)
    {
        CachedBuffer buffer= new CachedBuffer(value, ordinal);
        _bufferMap.put(buffer, buffer);
        _stringMap.put(value, buffer);
        while ((ordinal - _index.size()) > 0)
            _index.add(null);
        _index.add(ordinal, buffer);
        return buffer;
    }

    public CachedBuffer get(int ordinal)
    {
        if (ordinal < 0 || ordinal >= _index.size())
            return null;
        return (CachedBuffer)_index.get(ordinal);
    }

    public CachedBuffer get(Buffer buffer)
    {
        return (CachedBuffer)_bufferMap.get(buffer);
    }

    public CachedBuffer get(String value)
    {
        return (CachedBuffer)_stringMap.get(value);
    }

    public Buffer lookup(Buffer buffer)
    {
        Buffer b= get(buffer);
        if (b == null)
        {
            if (buffer instanceof Buffer.CaseInsensitve)
                return buffer;
            return new View.CaseInsensitive(buffer);
        }

        return b;
    }
    
    public CachedBuffer getBest(byte[] value, int offset, int maxLength)
    {
        Entry entry = _stringMap.getBestEntry(value, offset, maxLength);
        if (entry!=null)
            return (CachedBuffer)entry.getValue();
        return null;
    }

    public Buffer lookup(String value)
    {
        Buffer b= get(value);
        if (b == null)
        {
            return new CachedBuffer(value,-1);
        }
        return b;
    }

    public String toString(Buffer buffer)
    {
        return lookup(buffer).toString();
    }

    public int getOrdinal(Buffer buffer)
    {
        if (buffer instanceof CachedBuffer)
            return ((CachedBuffer)buffer).getOrdinal();
        buffer=lookup(buffer);
        if (buffer!=null && buffer instanceof CachedBuffer)
            return ((CachedBuffer)buffer).getOrdinal();
        return -1;
    }
    
    public static class CachedBuffer extends ByteArrayBuffer.CaseInsensitive
    {
        private int _ordinal;
        private HashMap _associateMap=null;
        
        public CachedBuffer(String value, int ordinal)
        {
            super(value);
            _ordinal= ordinal;
        }

        public int getOrdinal()
        {
            return _ordinal;
        }

        public CachedBuffer getAssociate(Object key)
        {
            if (_associateMap==null)
                return null;
            return (CachedBuffer)_associateMap.get(key);
        }
        
        public void setAssociate(Object key, CachedBuffer associate)
        {
            // TODO should be synchronized - but lets try without
            if (_associateMap==null)
                _associateMap=new HashMap();
            _associateMap.put(key,associate);
        }
    }
    
    
    public String toString()
    {
        return "CACHE["+
        	"bufferMap="+_bufferMap+
        	",stringMap="+_stringMap+
        	",index="+_index+
        	"]";
    }
}

Other Jetty examples (source code examples)

Here is a short list of links related to this Jetty BufferCache.java source code file:

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