Source Code : Resettable File InputStream

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

Resettable File InputStream

   
/****************************************************************
 * 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.                                           *
 ****************************************************************/


import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author  Federico Barbieri <fede@apache.org>
 */
public class ResettableFileInputStream
    extends InputStream
{
    protected static final int DEFAULT_BUFFER_SIZE = 1024;

    protected final String m_filename;
    protected int m_bufferSize;
    protected InputStream m_inputStream;
    protected long m_position;
    protected long m_mark;
    protected boolean m_isMarkSet;

    public ResettableFileInputStream( final File file )
        throws IOException
    {
        this( file.getCanonicalPath() );
    }

    public ResettableFileInputStream( final String filename )
        throws IOException
    {
        this( filename, DEFAULT_BUFFER_SIZE );
    }

    public ResettableFileInputStream( final String filename, final int bufferSize )
        throws IOException
    {
        m_bufferSize = bufferSize;
        m_filename = filename;
        m_position = 0;

        m_inputStream = newStream();
    }

    public void mark( final int readLimit )
    {
        m_isMarkSet = true;
        m_mark = m_position;
        m_inputStream.mark( readLimit );
    }

    public boolean markSupported()
    {
        return true;
    }

    public void reset()
        throws IOException
    {
        if( !m_isMarkSet )
        {
            throw new IOException( "Unmarked Stream" );
        }
        try
        {
            m_inputStream.reset();
        }
        catch( final IOException ioe )
        {
            try
            {
                m_inputStream.close();
                m_inputStream = newStream();
                m_inputStream.skip( m_mark );
                m_position = m_mark;
            }
            catch( final Exception e )
            {
                throw new IOException( "Cannot reset current Stream: " + e.getMessage() );
            }
        }
    }

    protected InputStream newStream()
        throws IOException
    {
        return new BufferedInputStream( new FileInputStream( m_filename ), m_bufferSize );
    }

    public int available()
        throws IOException
    {
        return m_inputStream.available();
    }

    public void close() throws IOException
    {
        m_inputStream.close();
    }

    public int read() throws IOException
    {
        m_position++;
        return m_inputStream.read();
    }

    public int read( final byte[] bytes, final int offset, final int length )
        throws IOException
    {
        final int count = m_inputStream.read( bytes, offset, length );
        m_position += count;
        return count;
    }

    public long skip( final long count )
        throws IOException
    {
        m_position += count;
        return m_inputStream.skip( count );
    }
}

   
    
    
  

Thank with us