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//========================================================================
//$Id: View.java,v 1.1 2005/10/05 14:09:25 janb Exp $
//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;
/**
* A View on another buffer. Allows operations that do not change the _content or
* indexes of the backing buffer.
*
* @author gregw
*
*/
public class View extends AbstractBuffer
{
Buffer _buffer;
/**
* @param buffer The Buffer on which we are presenting a View.
* @param mark The initial value of the {@link Buffer#markIndex mark index}
* @param get The initial value of the {@link Buffer#getIndex get index}
* @param put The initial value of the {@link Buffer#putIndex put index}
* @param access The access level - one of the constants from {@link Buffer}.
*/
public View(Buffer buffer, int mark, int get, int put,int access)
{
super(READWRITE,!buffer.isImmutable());
_buffer=buffer.buffer();
setPutIndex(put);
setGetIndex(get);
setMarkIndex(mark);
_access=access;
}
public View(Buffer buffer)
{
super(READWRITE,!buffer.isImmutable());
_buffer=buffer.buffer();
setPutIndex(buffer.putIndex());
setGetIndex(buffer.getIndex());
setMarkIndex(buffer.markIndex());
_access=buffer.isReadOnly()?READONLY:READWRITE;
}
public View()
{
super(READWRITE,true);
}
/**
* Update view to buffer
*/
public void update(Buffer buffer)
{
_access=READWRITE;
_buffer=buffer.buffer();
setGetIndex(0);
setPutIndex(buffer.putIndex());
setGetIndex(buffer.getIndex());
setMarkIndex(buffer.markIndex());
_access=buffer.isReadOnly()?READONLY:READWRITE;
}
public void update(int get, int put)
{
int a=_access;
_access=READWRITE;
setGetIndex(0);
setPutIndex(put);
setGetIndex(get);
setMarkIndex(-1);
_access=a;
}
/**
* @return The {@link Buffer#array()} from the underlying buffer.
*/
public byte[] array()
{
return _buffer.array();
}
/**
* @return The {@link Buffer#buffer()} from the underlying buffer.
*/
public Buffer buffer()
{
return _buffer.buffer();
}
/**
* @return The {@link Buffer#capacity} of the underlying buffer.
*/
public int capacity()
{
return _buffer.capacity();
}
/**
*
*/
public void clear()
{
setMarkIndex(-1);
setGetIndex(0);
setPutIndex(_buffer.getIndex());
setGetIndex(_buffer.getIndex());
}
/**
*
*/
public void compact()
{
// TODO
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#equals(java.lang.Object)
*/
public boolean equals(Object obj)
{
return this==obj ||((obj instanceof Buffer)&&((Buffer)obj).equals(this)) || super.equals(obj);
}
/**
* @return Whether the underlying buffer is {@link Buffer#isReadOnly read only}
*/
public boolean isReadOnly()
{
return _buffer.isReadOnly();
}
/**
* @return Whether the underlying buffer is {@link Buffer#isVolatile volatile}
*/
public boolean isVolatile()
{
return true;
}
/**
* @return The result of calling {@link Buffer#peek(int)} on the underlying buffer
*/
public byte peek(int index)
{
return _buffer.peek(index);
}
/**
* @return The result of calling {@link Buffer#peek(int, byte[], int, int)} on the underlying buffer
*/
public int peek(int index, byte[] b, int offset, int length)
{
return _buffer.peek(index,b,offset,length);
}
/**
* @return The result of calling {@link Buffer#peek(int, int)} on the underlying buffer
*/
public Buffer peek(int index, int length)
{
return _buffer.peek(index, length);
}
/**
* @param index
* @param src
*/
public int poke(int index, Buffer src)
{
return _buffer.poke(index,src);
}
/**
* @param index
* @param b
*/
public void poke(int index, byte b)
{
_buffer.poke(index,b);
}
/**
* @param index
* @param b
* @param offset
* @param length
*/
public int poke(int index, byte[] b, int offset, int length)
{
return _buffer.poke(index,b,offset,length);
}
public String toString()
{
if (_buffer==null)
return "INVALID";
return super.toString();
}
public static class CaseInsensitive extends View implements Buffer.CaseInsensitve
{
public CaseInsensitive()
{
super();
}
public CaseInsensitive(Buffer buffer, int mark, int get, int put, int access)
{
super(buffer,mark,get,put,access);
}
public CaseInsensitive(Buffer buffer)
{
super(buffer);
}
public boolean equals(Object obj)
{
return this==obj ||((obj instanceof Buffer)&&((Buffer)obj).equalsIgnoreCase(this)) || super.equals(obj);
}
}
}
