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File org.sfc.xml.ReferenceCountedSAXSource.java

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/*
 * Copyright (c) 2005 Thomas Weise
 * 
 * E-Mail           : tweise@gmx.de
 * Creation Date    : 2005-07-20 16:39:42
 * Original Filename: org.sfc.xml.ReferenceCountedSAXSource.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 javax.xml.transform.Result;
import javax.xml.transform.sax.SAXSource;

import org.xml.sax.InputSource;

import org.sfc.scoped.AlreadyDisposedException;
import org.sfc.scoped.IReferenceCounted;

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

public final  class ReferenceCountedSAXSource extends    SAXSource
                                              implements IReferenceCounted,
                                                         Result
  {
/**
 * 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    ;


/**
 * Create a new closeable sax source.
 */

  ReferenceCountedSAXSource  ()
    {
    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();
        }
      }
    }
  
  
/**
 * Copy the data from another sax-source to this one.
 * @param p_ss  The sax-source to be copied.
 */

  public final void set_sax_source(final SAXSource p_ss)
    {
    InputSource                 l_x;
    ReferenceCountedInputSource l_is;
    
    l_x = p_ss.getInputSource();
    if(l_x != null)
      {
      l_is = new ReferenceCountedInputSource();
      l_is.set_input_source(l_x);
      super.setInputSource(l_is);
      }
    else super.setInputSource(null);
    
    this.setSystemId(p_ss.getSystemId());
    }
  
/**
 * 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();
    }
  
/**
 * Set the SAX InputSource to be used for the Source.
 *
 * @param p_input_source A valid InputSource reference.
 */

  @Override
  public final  void setInputSource(final InputSource p_input_source)
    {
    ReferenceCountedInputSource l_x;
    
    l_x = ((ReferenceCountedInputSource)(this.getInputSource()));
    if(l_x != null) l_x.release();
    super.setInputSource(XML.get_input_source(p_input_source));
    }
  
/**
 * 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
    {
    ReferenceCountedInputSource l_x;
    
    
    synchronized(this)
      {
      if(this.m_living)
        {        
        if( (--this.m_ref_count) <= 0)
          {
          this.m_living = false;
          
          l_x = ((ReferenceCountedInputSource)(this.getInputSource()));
          if(l_x != null) return l_x.do_release();          
          }
        }
      else
        {
        throw new AlreadyDisposedException();
        }
      }
    
    return null;
    }
  
  
  
  
/**
 * Returns a new instance of the io object.
 * @return  Another port to the io object.
 */

    @Override
  public  final Object  clone ()
    {
    this.add_ref();
    return this;
    }

/**
 * 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:ReferenceCountedSAXSource.java
package:org.sfc.xml
qualified name:org.sfc.xml.ReferenceCountedSAXSource.java
file type:Java Source File
download location:download http://dgpf.sourceforge.net/source/org/sfc/xml/ReferenceCountedSAXSource.java
size:5.785 KB (5924 B)
uploaded: 2015-07-22 04:11:13 GMT+0000
last update: 2006-03-07 04:20:28 GMT+0000
last access: 2018-01-22 03:59:37 GMT+0000

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