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//
// ========================================================================
// Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.io;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map.Entry;
import org.eclipse.jetty.util.StringMap;
/* ------------------------------------------------------------------------------- */
/**
* Stores a collection of {@link Buffer} objects.
* Buffers are stored in an ordered collection and can retreived by index or value
*
*/
public class BufferCache
{
private final HashMap _bufferMap=new HashMap();
private final StringMap _stringMap=new StringMap(StringMap.CASE_INSENSTIVE);
private final 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);
if (_index.get(ordinal)==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)
{
if (buffer instanceof CachedBuffer)
return buffer;
Buffer b= get(buffer);
if (b == null)
{
if (buffer instanceof Buffer.CaseInsensitve)
return buffer;
return new ByteArrayBuffer.CaseInsensitive(buffer.asArray(),0,buffer.length(),Buffer.IMMUTABLE);
}
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(String value)
{
CachedBuffer buffer = (CachedBuffer)_stringMap.get(value);
return buffer==null?-1:buffer.getOrdinal();
}
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 final 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);
}
// TODO Replace Associate with a mime encoding specific solution
public void setAssociate(Object key, CachedBuffer associate)
{
if (_associateMap==null)
_associateMap=new HashMap();
_associateMap.put(key,associate);
}
}
@Override
public String toString()
{
return "CACHE["+
"bufferMap="+_bufferMap+
",stringMap="+_stringMap+
",index="+_index+
"]";
}
}
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