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File org.sfc.xml.ReferenceCountedStreamResult.java

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/*
 * Copyright (c) 2005 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2005-07-25 16:33:11
 * Original Filename: org.sfc.xml.ReferenceCountedStreamResult.java
 * Version          : 1.0.2
 * Last modification: 2006-03-07
 *                by: Thomas Weise
 * 
 * License          : GNU LESSER GENERAL PUBLIC LICENSE
 *                    Version 2.1, February 1999
 *                    You should have received a copy of this license along
 *                    with this library; if not, write to the Free Software
 *                    Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *                    MA 02111-1307, USA or download the license under
 *                    http://www.gnu.org/copyleft/lesser.html.
 *                    
 * Warranty         : This software is provided "as is" without any
 *                    warranty; without even the implied warranty of
 *                    merchantability or fitness for a particular purpose.
 *                    See the Gnu Lesser General Public License for more
 *                    details.
 */

 
package org.sfc.xml;

import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamResult;

import org.sfc.io.IO;
import org.sfc.io.ReferenceCountedOutputStream;
import org.sfc.io.ReferenceCountedWriter;
import org.sfc.scoped.AlreadyDisposedException;
import org.sfc.scoped.IReferenceCounted;

/**
 * A stream result implementing the <code>IReferenceCounted</code>-
 * interface.
 *
 * @author Thomas Weise
 */

public final  class ReferenceCountedStreamResult
                                          extends     StreamResult
                                          implements  IReferenceCounted,
                                                      Source
  {
/**
 * The internal reference counter.
 */

  private   int       m_ref_count ;
/**
 * <code>true</code> as long as this object is alive, <code>false</code> if
 * it died. 
 */

  private   boolean   m_living    ;

/**
 * Construct a new <code>StreamResult</code>.
 *
 */

  public  ReferenceCountedStreamResult()
    {
    super();
    this.m_living    = true;
    this.m_ref_count = 1;
    }
  
  
/**
 * Increase the reference counter of this object by one.
 * You must call <code>add_ref</code> before you assign a variable to point
 * on this object (except when calling the constructor and storing the
 * result to exactly one variable).
 * @throws AlreadyDisposedException If the object has already been disposed.
 */

  public  final void  add_ref () throws AlreadyDisposedException
    {
    synchronized(this)
      {
      if(this.m_living)
        {
        this.m_ref_count++;
        }
      else
        {
        throw new AlreadyDisposedException();
        }
      }
    }
  
/**
 * Decrease the reference counter of this object by one.
 * If the reference count reaches zero, the object will automatically
 * perform cleanup operations. You must call <code>release</code> whenever
 * you don't need a variable pointing to this object anymore.
 * @throws AlreadyDisposedException If the object has already been disposed.
 */

  public  final void  release () throws AlreadyDisposedException
    {
    this.do_release();
    }
  
  
/**
 * Decrease the reference counter of this object by one.
 * If the reference count reaches zero, the object will automatically
 * perform cleanup operations. You must call <code>release</code> whenever
 * you don't need a variable pointing to this object anymore.
 * @throws AlreadyDisposedException If the object has already been disposed.
 * @return  The <code>IOException</code> that was thrown during closing of
 *          the object, or <code>null</code> if everything was ok. 
 */

  final IOException do_release () throws AlreadyDisposedException
    {
    OutputStream l_is;
    Writer       l_r;
    IOException  l_ioe;
    
    synchronized(this)
      {
      if(this.m_living)
        {        
        if( (--this.m_ref_count) <= 0)
          {
          this.m_living = false;
       
          l_ioe = null;
          l_is  = getOutputStream();
          if(l_is != null)
            {
            try
              {
              l_is.close();        
              }
            catch(IOException l_ioe2)
              {
              l_ioe = l_ioe2;
              }
            finally
              {
              super.setOutputStream(null);
              }      
            }
          
          l_r = getWriter();
          if(l_r != null)
            {
            try
              {
              l_r.close();        
              }
            catch(IOException l_ioe2)
              {
              l_ioe = l_ioe2;
              }
            finally
              {
              super.setWriter(null);
              }
            }
          
          return l_ioe;
          }
        }
      else
        {
        throw new AlreadyDisposedException();
        }
      }
    
    return null;
    }
  
/**
 * Set the ByteStream that is to be written to.  Normally,
 * a stream should be used rather than a reader, so that
 * the transformer may use instructions contained in the
 * transformation instructions to control the encoding.
 *
 * @param p_output_stream A valid OutputStream reference.
 */

  @Override
  public final  void setOutputStream(final OutputStream p_output_stream)
    {
    ReferenceCountedOutputStream  l_x;
    
    l_x = ((ReferenceCountedOutputStream)(this.getOutputStream()));
    if(l_x != null) l_x = null;
    
    super.setOutputStream(IO.get_output_stream(p_output_stream));
    }

/**
 * Assign this stream result from another one.
 * @param p_result The other stream result to be the blueprint for this
 *                 one.
 */

  public final void set_stream_result(final StreamResult p_result)
    {
    OutputStream  l_os;
    Writer        l_w;
    
    l_os = p_result.getOutputStream();
    l_w  = p_result.getWriter();
    if(p_result instanceof ReferenceCountedStreamResult)
      {
      if(l_os != null) ((ReferenceCountedOutputStream)l_os).add_ref();
      if(l_w != null) ((ReferenceCountedWriter)l_w).add_ref();
      }
    
    this.setOutputStream(l_os);
    this.setWriter(l_w);
    this.setSystemId(p_result.getSystemId());
    }
  
/**
 * Set the writer that is to receive the result.  Normally,
 * a stream should be used rather than a writer, so that
 * the transformer may use instructions contained in the
 * transformation instructions to control the encoding.  However,
 * there are times when it is useful to write to a writer,
 * such as when using a StringWriter.
 *
 * @param p_writer  A valid Writer reference.
 */

  @Override
  public final  void setWriter(final  Writer p_writer)
    {
    ReferenceCountedWriter  l_x;
    
    l_x = ((ReferenceCountedWriter)p_writer);
    if(l_x != null) l_x.release();
    
    super.setWriter(IO.get_writer(p_writer,
                                             XML.PREFERED_ENCODING));
    }

  
  
  
  

/**
 * Cleanup this input source.
 * @throws  Throwable From the super implementation.
 */

    @Override
  protected final void  finalize  ()  throws Throwable
    {    
    synchronized(this)
      {
      if(this.m_living)
        {
        this.m_ref_count = 1;
        this.do_release();
        this.m_living    = false;               
        }
      
      this.m_ref_count = 0;
      }
    super.finalize();
    }
  }

File Information:

file name:ReferenceCountedStreamResult.java
package:org.sfc.xml
qualified name:org.sfc.xml.ReferenceCountedStreamResult.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/sfc/xml/ReferenceCountedStreamResult.java
size:7.568 KB (7750 B)
uploaded: 2018-01-07 12:03:36 GMT+0000
last update: 2006-03-07 04:20:28 GMT+0000
last access: 2018-04-27 02:32:48 GMT+0000

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