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///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename:  ConvTableJavaMap.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2004 International Business Machines Corporation and
// others.  All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.access;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

/** This is the class representing a Java converter table.  Each instance of this class handles an encoding that the Toolbox does not support and Java does.  Hence, multiple instances of this class could be cached in the converter pool.
 * 
 */
public class ConvTableJavaMap extends ConvTable
{
    private static final String copyright = "Copyright (C) 1997-2004 International Business Machines Corporation and others.";

    InputStreamReader reader_; // The stream that does the actual conversion.
    OutputStreamWriter writer_; // The stream that does the actual conversion.
    ByteArrayOutputStream outBuffer_;
    ConvTableInputStream inBuffer_;  

    // Constructor.
    ConvTableJavaMap(String encoding) throws UnsupportedEncodingException
    {
        super(0); // Just for compatibility.
        encoding_ = encoding;
        String ccsid = ConversionMaps.encodingToCcsidString(encoding);
        try
        {
            ccsid_ = (new Integer(ccsid)).intValue();
        }
        catch (Exception e)
        {
            if (Trace.traceConversion_) Trace.log(Trace.CONVERSION, "No associated CCSID for encoding '" + encoding + "'. Lookup returned " + ccsid + ".");
            ccsid_ = 0;
        }

        inBuffer_ = new ConvTableInputStream();
        outBuffer_ = new ByteArrayOutputStream();
        writer_ = new OutputStreamWriter(outBuffer_, encoding_);
        reader_ = new InputStreamReader(inBuffer_, encoding_);

        if (Trace.traceConversion_) Trace.log(Trace.CONVERSION, "Successfully loaded Java map for encoding: " + encoding_);
    }

    // Let Java perform an Encoding to Unicode conversion.
    final String byteArrayToString(byte[] buf, int offset, int length, BidiConversionProperties properties)
    {
        if (Trace.traceConversion_) Trace.log(Trace.CONVERSION, "Converting byte array to string for encoding: " + encoding_, buf, offset, length);
        char[] dest = new char[length];
        int count = 0;
        synchronized (inBuffer_)
        {
            inBuffer_.setContents(buf, offset, length);
            try
            {
                if (reader_ == null)
                {
                    reader_ = new InputStreamReader(inBuffer_, encoding_);
                }
                count = reader_.read(dest);
            }
            catch (IOException e)
            {
                if (Trace.traceConversion_) Trace.log(Trace.ERROR, "IOException occurred on byteArrayToString for encoding " + encoding_, e);
            }
            reader_ = null;
        }
        if (Trace.traceConversion_) Trace.log(Trace.CONVERSION, "Destination string for encoding: " + encoding_ + " (" + count + ")", ConvTable.dumpCharArray(dest));
        return String.copyValueOf(dest, 0, count);
    }

    // Let Java perform a Unicode to Encoding conversion.
    final byte[] stringToByteArray(String source, BidiConversionProperties properties)
    {
        if (Trace.traceConversion_) Trace.log(Trace.CONVERSION, "Converting string to byte array for encoding: " + encoding_, ConvTable.dumpCharArray(source.toCharArray()));
        byte[] ret = null;
        synchronized (outBuffer_)
        {
            try
            {
                outBuffer_.reset();
                if (writer_ == null)
                {
                    writer_ = new OutputStreamWriter(outBuffer_, encoding_);
                }
                writer_.write(source);
                writer_.flush();
            }
            catch (IOException e)
            {
                if (Trace.traceConversion_) Trace.log(Trace.ERROR, "IOException occurred on stringToByteArray for encoding " + encoding_, e);
            }
            writer_ = null;
            ret = outBuffer_.toByteArray();
        }
        if (Trace.traceConversion_) Trace.log(Trace.CONVERSION, "Destination byte array for encoding: " + encoding_, ret);
        return ret;
    }
}