CharSequenceDeferred.java :  » Web-Framework » rife-1.6.1 » com » uwyn » rife » engine » Java Open Source

/*
 * Copyright 2001-2007 Geert Bevin <gbevin[remove] at uwyn dot com>
 * Distributed under the terms of either:
 * - the common development and distribution license (CDDL), v1.0; or
 * - the GNU Lesser General Public License, v2.1 or later
 * $Id: CharSequenceDeferred.java 3734 2007-05-02 22:19:07Z gbevin $
 */
package com.uwyn.rife.engine;

import com.uwyn.rife.template.TemplateEncoder;

public abstract class CharSequenceDeferred<T extends CharSequenceDeferred> implements CharSequence
{
  private  CharSequence  mContent = null;
  private  String      mResult = null;
  private  TemplateEncoder  mEncoder = null;
  private long      mPreservedInputsModified = -1;
  
  public synchronized void setContent(CharSequence content)
  {
    mContent = content;
  }
  
  synchronized T encoder(TemplateEncoder encoder)
  {
    mEncoder = encoder;
    mResult = null;
    
    return (T)this;
  }
  
  public synchronized String encode(String value)
  {
    if (null == mEncoder)
    {
      return value;
    }
    
    return mEncoder.encode(value);
  }
  
  protected abstract void fillInContent();
  
  public synchronized final String toString()
  {
    long modified = RequestState.getActiveRequestState().getElementResultStatesObtained().getModified();
    if (mPreservedInputsModified != modified)
    {
      mResult = null;
      mPreservedInputsModified = modified;
      fillInContent();
    }
    
    if (null == mContent)
    {
      return null;
    }
    
    if (null == mResult)
    {
      mResult = mContent.toString();
    }
    
    return mResult;
  }
  
  public int length()
  {
    return 0;
  }
  
  public char charAt(int index)
  {
    return toString().charAt(index);
  }
  
  public CharSequence subSequence(int start, int end)
  {
    return toString().subSequence(start, end);
  }
}