/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.mina.filter.codec.textline;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoder;
import org.apache.mina.filter.codec.ProtocolEncoderAdapter;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import org.apache.mina.util.CharsetUtil;
/**
* A {@link ProtocolEncoder} which encodes a string into a text line
* which ends with the delimiter.
*
* @author The Apache Directory Project (mina-dev@directory.apache.org)
* @version $Rev: 436993 $, $Date: 2006-08-26 07:36:56 +0900 (토, 26 8월 2006) $,
*/
public class TextLineEncoder extends ProtocolEncoderAdapter
{
private static final String ENCODER = TextLineEncoder.class.getName() + ".encoder";
private final Charset charset;
private final LineDelimiter delimiter;
private int maxLineLength = Integer.MAX_VALUE;
public TextLineEncoder()
{
this( CharsetUtil.getDefaultCharset(), LineDelimiter.UNIX );
}
public TextLineEncoder( LineDelimiter delimiter )
{
this( CharsetUtil.getDefaultCharset(), delimiter );
}
public TextLineEncoder( Charset charset )
{
this( charset, LineDelimiter.UNIX );
}
public TextLineEncoder( Charset charset, LineDelimiter delimiter )
{
if( charset == null )
{
throw new NullPointerException( "charset" );
}
if( delimiter == null )
{
throw new NullPointerException( "delimiter" );
}
if( LineDelimiter.AUTO.equals( delimiter ) )
{
throw new IllegalArgumentException( "AUTO delimiter is not allowed for encoder." );
}
this.charset = charset;
this.delimiter = delimiter;
}
/**
* Returns the allowed maximum size of the encoded line.
* If the size of the encoded line exceeds this value, the encoder
* will throw a {@link IllegalArgumentException}. The default value
* is {@link Integer#MAX_VALUE}.
*/
public int getMaxLineLength()
{
return maxLineLength;
}
/**
* Sets the allowed maximum size of the encoded line.
* If the size of the encoded line exceeds this value, the encoder
* will throw a {@link IllegalArgumentException}. The default value
* is {@link Integer#MAX_VALUE}.
*/
public void setMaxLineLength( int maxLineLength )
{
if( maxLineLength <= 0 )
{
throw new IllegalArgumentException( "maxLineLength: " + maxLineLength );
}
this.maxLineLength = maxLineLength;
}
public void encode( IoSession session, Object message,
ProtocolEncoderOutput out )
throws Exception
{
CharsetEncoder encoder = ( CharsetEncoder ) session.getAttribute( ENCODER );
if( encoder == null )
{
encoder = charset.newEncoder();
session.setAttribute( ENCODER, encoder );
}
String value = message.toString();
ByteBuffer buf = ByteBuffer.allocate( value.length() ).setAutoExpand( true );
buf.putString( value, encoder );
if( buf.position() > maxLineLength )
{
throw new IllegalArgumentException( "Line length: " + buf.position() );
}
buf.putString( delimiter.getValue(), encoder );
buf.flip();
out.write( buf );
}
public void dispose() throws Exception
{
}
}