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/*******************************************************************************
 * Copyright (c) 2003, 2007 s IT Solutions AT Spardat GmbH .
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     s IT Solutions AT Spardat GmbH - initial API and implementation
 *******************************************************************************/

//@(#) $Id: BinarySerializer.java 2089 2007-11-28 13:56:13Z s3460 $
package at.spardat.xma.serializer;

import java.io.IOException;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

import at.spardat.enterprise.exc.SysException;
import at.spardat.xma.util.ByteArray;


/**
 * Serializer implementation that uses the Java-Serialization mechanism
 * 
 * @author YSD, 11.02.2005  
 */
public final class BinarySerializer implements Serializer {

    
    /**
     * Is this executing at the server side of xma?
     */
    private boolean                     fIsAtServer = false;
    
    /**
     * This member is accessed from methods implementing the Synchronization
     * interface.
     */
    private ObjectOutput                fObjOut_;
    
    /**
     * The output buffer
     */
    private ByteArray                   fBuf;
    
    
    
    /**
     * Constructor
     * 
     * @param isAtServer is this serializer running at the server side?
     * @param bufferSize initial buffer size
     */
    public BinarySerializer (boolean isAtServer, int bufferSize) {
        fIsAtServer = isAtServer;
        fBuf = new ByteArray (bufferSize);
    }
    
    /**
     * Since the streams cannot be opened in the constructor, we
     * do it lazy in this method
     */
    private final void initialize () {
        if (fObjOut_ == null) {
            try {
                fObjOut_ = new ObjectOutputStream (fBuf.getOutputStream());
            } catch (IOException x) {
                throw new SysException (x);
            }
        }
    }
    
    
    /**
     * @see at.spardat.xma.serializer.Serializer#addHeader()
     */
    public void addHeader() {
        fBuf.addHeader();
    }

    
    /**
     * @see at.spardat.xma.serializer.Serializer#isAtServer()
     */
    public boolean isAtServer() {
        return fIsAtServer;
    }
    
    /**
     * @see at.spardat.xma.serializer.Serializer#getResult()
     */
    public ByteArray getResult() {
        if (fObjOut_ == null) initialize();
        try {
            fObjOut_.close();
        } catch (Exception x) {
            throw new SysException (x);
        }
        return fBuf;
    }

    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeString(java.lang.String, java.lang.String)
     */
    public void writeString (String label, String s) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeUTF(s);
    }
    
    /**
     * @see at.spardat.xma.serializer.XmaOutput#writeStringN(java.lang.String, java.lang.String)
     */
    public void writeStringN (String label, String s) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeBoolean(s == null);
        if (s != null) {
            fObjOut_.writeUTF(s);
        }
    }

    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeInt(java.lang.String, int)
     */
    public void writeInt(String label, int i) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeInt(i);
    }
    
    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeLong(java.lang.String, long)
     */
    public void writeLong(String label, long l) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeLong(l);
    }

    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeShort(java.lang.String, short)
     */
    public void writeShort(String label, int s) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeShort(s);
    }

    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeBoolean(java.lang.String, boolean)
     */
    public void writeBoolean(String label, boolean b) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeBoolean(b);
    }

    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeByte(java.lang.String, int)
     */
    public void writeByte(String label, int b) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeByte(b);
    }
    
    /**
     * @see at.spardat.xma.serializer.XmaOutput#writeSerializedBytes(String, byte[])
     */
    public void writeSerializedBytes(String label, byte[] bytes) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeInt (bytes.length);
        fObjOut_.write (bytes);
    }    
    
    /* (non-Javadoc)
     * @see at.spardat.xma.serializer.XmaOutput#writeObject(java.lang.String, java.lang.Object)
     */
    public void writeObject(String label, Object obj) throws IOException {
        if (fObjOut_ == null) initialize();
        fObjOut_.writeObject(obj);
    }

}