/**************************************************************
 * 
 * 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 com.sun.star.script.framework.io;

import com.sun.star.io.XInputStream;
import java.io.InputStream;
import java.io.IOException;

public class XInputStreamImpl implements XInputStream
{
    InputStream is;
    public XInputStreamImpl( InputStream is )
    {
        this.is = is;
    }
   
    public int readBytes( /*OUT*/byte[][] aData, /*IN*/int nBytesToRead ) throws com.sun.star.io.NotConnectedException, com.sun.star.io.BufferSizeExceededException, com.sun.star.io.IOException
    {
        aData[ 0 ] = new byte[ nBytesToRead ];

        int totalBytesRead = 0;

        try
        {
            int bytesRead = 0; 
            while ( ( nBytesToRead > 0 ) && ( bytesRead = is.read( aData[ 0 ], totalBytesRead, nBytesToRead ) ) > 0 )
            {
                totalBytesRead += bytesRead;
                nBytesToRead -= bytesRead;
            }
            if ( totalBytesRead < aData[ 0 ].length )
            {
                byte[] out = new byte[ totalBytesRead ];
                System.arraycopy( aData[ 0 ], 0, out, 0, totalBytesRead );
                aData[ 0 ] = out;
            }
        }
        catch ( IOException e )
        {
            throw new com.sun.star.io.IOException( e.toString() );
        }
        catch ( IndexOutOfBoundsException aie )
        {
            throw new com.sun.star.io.BufferSizeExceededException( aie.toString() );
        }
        return totalBytesRead;   
    }

    public int readSomeBytes( /*OUT*/byte[][] aData, /*IN*/int nMaxBytesToRead ) throws com.sun.star.io.NotConnectedException, com.sun.star.io.BufferSizeExceededException, com.sun.star.io.IOException
    {
        int bytesToRead = nMaxBytesToRead;
        int availableBytes = available();
        if ( 0 < availableBytes && availableBytes < nMaxBytesToRead )
        {
            bytesToRead = availableBytes;
        } 
        int read =  readBytes( aData, bytesToRead );
        return read;
    }

    public void skipBytes( /*IN*/int nBytesToSkip ) throws com.sun.star.io.NotConnectedException, com.sun.star.io.BufferSizeExceededException, com.sun.star.io.IOException
    {
        long bytesSkipped = 0;
        try 
        {
            bytesSkipped = is.skip( (long)nBytesToSkip );
        }
        catch ( IOException e )
        {
            throw new com.sun.star.io.IOException( e.toString() );
        }
    }

    public int available(  ) throws com.sun.star.io.NotConnectedException, com.sun.star.io.IOException
    {
        int bytesAvail = 0;
        try 
        {
            bytesAvail = is.available();
        }
        catch ( IOException e )
        {
            throw new com.sun.star.io.IOException( e.toString() );
        }
        return bytesAvail;
    }

    public void closeInput(  ) throws com.sun.star.io.NotConnectedException, com.sun.star.io.IOException
    {
        try 
        {
            is.close();
        }
        catch( IOException e )
        {
            throw new com.sun.star.io.IOException( e.toString() );
        }
    }

}