rtfdestination.java

处理PDF

/*
 * $Id: RtfDestination.java 3373 2008-05-12 16:21:24Z xlv $
 *
 * Copyright 2007 by Howard Shank ([e-mail])
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999-2006 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000-2006 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the ?GNU LIBRARY GENERAL PUBLIC LICENSE?), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.text.rtf.parser.destinations;

import java.util.ArrayList;
import java.util.Iterator;

import com.lowagie.text.rtf.parser.RtfParser;
import com.lowagie.text.rtf.parser.ctrlwords.RtfCtrlWordData;

 /**
  * <code>RtfDestination</code> is the base class for destinations according
  * to the RTF Specification. All destinations must extend from this class.
  * 
  * @author Howard Shank ([e-mail]
  * 
  * @since 2.0.8
  */
public abstract class RtfDestination {
	/** Parser object */
	protected RtfParser rtfParser = null;
	
	/** Is data in destination modified? */
	protected boolean modified = false;

	/** The last control word handled by this destination */
	protected RtfCtrlWordData lastCtrlWord = null;;
	
	/** The <code>RtfDestinationListener</code>. */
    private static ArrayList listeners = new ArrayList();
    
	/**
	 * Constructor.
	 */
	public RtfDestination() {
		rtfParser = null;
	}
	/**
	 * Constructor
	 * @param parser <code>RtfParser</code> object.
	 */
	public RtfDestination(RtfParser parser) {
		this.rtfParser = parser;
	}
	/**
	 * Set the parser to use with the RtfDestination object.
	 * 
	 * @param parser The RtfParser object.
	 */
	public void setParser(RtfParser parser) {
		if(this.rtfParser != null && this.rtfParser.equals(parser)) return;
		this.rtfParser = parser;
	}
	/**
	 * Clean up when destination is closed.
	 * @return true if handled, false if not handled
	 */
	public abstract boolean closeDestination();
	/**
	 * Handle a new subgroup contained within this group
	 * @return true if handled, false if not handled
	 */
	public abstract boolean handleOpeningSubGroup();
	/**
	 * Clean up when group is closed.
	 * @return true if handled, false if not handled
	 */
	public abstract boolean handleCloseGroup();

	/**
	 * Setup when group is opened.
	 * @return true if handled, false if not handled
	 */
	public abstract boolean handleOpenGroup();
	/**
	 * Handle text for this destination
	 * @return true if handled, false if not handled
	 */
	public abstract boolean handleCharacter(int ch);
	/**
	 * Handle control word for this destination
	 * @param ctrlWordData The control word and parameter information object
	 * @return true if handled, false if not handled
	 */
	public abstract boolean handleControlWord(RtfCtrlWordData ctrlWordData);
	/**
	 * Method to set this object to the default values. Must be implemented in child class.
	 */
	public abstract void setToDefaults();

	/**
	 * Method to indicate if data in this destination has changed.
	 * @return true if modified, false if not modified.
	 */
	public boolean isModified() {
		return modified;
	}

	// listener methods

	/**
	 * Adds a <CODE>RtfDestinationListener</CODE> to the <CODE>RtfDestinationMgr</CODE>.
	 *
	 * @param listener
	 *            the new RtfDestinationListener.
	 */
	public boolean addListener(RtfDestinationListener listener) {
		return listeners.add(listener);
	}

	/**
	 * Removes a <CODE>RtfDestinationListener</CODE> from the <CODE>RtfDestinationMgr</CODE>.
	 *
	 * @param listener
	 *            the RtfCtrlWordListener that has to be removed.
	 */
	public boolean removeListener(RtfDestinationListener listener) {
		return listeners.remove(listener);
	}
	
	protected RtfCtrlWordData beforeCtrlWord(RtfCtrlWordData ctrlWordData) {
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.beforeCtrlWord(ctrlWordData);
        }
		return null;
	}
	/**
	 * 
	 */
	protected  RtfCtrlWordData onCtrlWord(RtfCtrlWordData ctrlWordData){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.onCtrlWord(ctrlWordData);
        }
		return null;
	}

	/**
	 * 
	 */
	protected  RtfCtrlWordData afterCtrlWord(RtfCtrlWordData ctrlWordData){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.afterCtrlWord(ctrlWordData);
        }
		return null;
	}

	/**
	 * 
	 */
	protected  int beforeCharacter(int ch){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.beforeCharacter(ch);
        }
		return 0;
	}

	/**
	 * 
	 */
	protected  int onCharacter(int ch){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.onCharacter(ch);
        }
		return 0;
	}

	/**
	 * 
	 */
	protected  int afterCharacter(int ch){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.afterCharacter(ch);
        }
		return 0;
	}

	/**
	 * 
	 * @return true if all goes well
	 */
	protected  boolean onOpenGroup(){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.onOpenGroup();
        }
		return true;
	}

	/**
	 * 
	 * @return true if all goes well
	 */
	protected  boolean onCloseGroup(){
		RtfDestinationListener listener;
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
            listener = (RtfDestinationListener) iterator.next();
            listener.onCloseGroup();
        }
		return true;
	}
	
	public int getNewTokeniserState() {
		return RtfParser.TOKENISER_IGNORE_RESULT;
	}
}