001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *  
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *  
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License. 
018 *  
019 */
020
021package org.apache.directory.server.kerberos.changepwd.protocol;
022
023
024import org.apache.directory.server.i18n.I18n;
025import org.apache.directory.server.kerberos.changepwd.io.ChangePasswordDecoder;
026import org.apache.mina.core.buffer.IoBuffer;
027import org.apache.mina.core.session.IoSession;
028import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
029import org.apache.mina.filter.codec.ProtocolDecoderOutput;
030
031
032/**
033 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
034 */
035public class MinaChangePasswordDecoder extends CumulativeProtocolDecoder
036{
037    private int maxObjectSize = 16384; // 16KB
038
039
040    /**
041     * Returns the allowed maximum size of the object to be decoded.
042     * 
043     * @return The max object size.
044     */
045    public int getMaxObjectSize()
046    {
047        return maxObjectSize;
048    }
049
050
051    /**
052     * Sets the allowed maximum size of the object to be decoded.
053     * If the size of the object to be decoded exceeds this value, this
054     * decoder will throw a {@link IllegalArgumentException}.  The default
055     * value is <tt>16384</tt> (16KB).
056     * 
057     * @param maxObjectSize The maximum size for a PDU
058     */
059    public void setMaxObjectSize( int maxObjectSize )
060    {
061        if ( maxObjectSize <= 0 )
062        {
063            throw new IllegalArgumentException( I18n.err( I18n.ERR_634, maxObjectSize ) );
064        }
065
066        this.maxObjectSize = maxObjectSize;
067    }
068
069
070    @Override
071    protected boolean doDecode( IoSession session, IoBuffer in, ProtocolDecoderOutput out ) throws Exception
072    {
073        boolean isTcp = !session.getTransportMetadata().isConnectionless();
074
075        out.write( ChangePasswordDecoder.decode( in.buf(), isTcp ) );
076
077        return true;
078    }
079}