xmlmessage.java

java做的WEB邮局系统

/* CVS ID: $Id: XMLMessage.java,v 1.2 2000/09/13 10:35:46 wastl Exp $ */
package net.wastl.webmail.xml;

import java.util.*;

import org.w3c.dom.*;
import org.apache.xerces.dom.*;

/*
 * XMLMessage.java
 *
 * Created: Tue Apr 18 14:02:30 2000
 *
 * Copyright (C) 2000 Sebastian Schaffert
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

/**
 * Represents an XML message object (part of the XMLUserModel)
 * @see XMLUserModel
 */
public class XMLMessage extends XMLMessagePart {
    
    protected Element message;

    public XMLMessage(Element message) {
	super(message);
	this.message=message;
    }
    
    public Element getMessageElement() {
	return message;
    }


    public boolean messageCompletelyCached() {
	NodeList nl=message.getElementsByTagName("PART");
	return nl.getLength()>0;
    }


    public void prepareReply(String prefix_subject, String postfix_subject,
			     String prefix_message, String postfix_message) {
	
	String subject=getHeader("SUBJECT");
	// Test whether this is already a reply (prefixed with RE or AW)
	if(!isReply(subject)) {
	    subject=prefix_subject+" "
		+getHeader("SUBJECT")+" "
		+postfix_subject;
	}
	setHeader("SUBJECT",subject);		    	

	XMLMessagePart firstpart=new XMLMessagePart(getFirstMessageTextPart(message));	

	firstpart.quoteContent();

	firstpart.insertContent(prefix_message+"\n",0);
	firstpart.addContent(postfix_message,0);

	removeAllParts();

	XMLMessagePart newmainpart=createPart("multi");	

	newmainpart.appendPart(firstpart);
    }

    public void prepareForward(String prefix_subject, String postfix_subject,
			       String prefix_message, String postfix_message) {

	String subject=getHeader("SUBJECT");
	subject=prefix_subject+" "
	    +getHeader("SUBJECT")+" "
	    +postfix_subject;
	setHeader("SUBJECT",subject);		    	

	XMLMessagePart mainpart=null;
	NodeList nl=message.getChildNodes();
	for(int i=0;i<nl.getLength();i++) {
	    Element elem=(Element)nl.item(i);
	    if(elem.getTagName().equals("PART")) {
		mainpart=new XMLMessagePart(elem);
		break;
	    }
	}
	XMLMessagePart firstpart=new XMLMessagePart(getFirstMessageTextPart(message));
	
	firstpart.insertContent(prefix_message+"\n",0);
	firstpart.addContent(postfix_message,0);

	removeAllParts();

	XMLMessagePart newmainpart=createPart("multi");

	newmainpart.appendPart(firstpart);

	if(mainpart != null) {
	    Enumeration enum=mainpart.getParts();
	    while(enum.hasMoreElements()) {
		newmainpart.appendPart((XMLMessagePart)enum.nextElement());
	    }
	}		
    }


    public Element getHeader() {
	NodeList nl=message.getElementsByTagName("HEADER");
	Element header=nl.getLength()==0?null:(Element)nl.item(0);
	if(header == null) {
	    header=root.createElement("HEADER");
	    message.appendChild(header);
	}
	return header;
    }

    public String getHeader(String header) {
	Element xml_header=getHeader();
	NodeList nl=xml_header.getElementsByTagName(header);
	Element element;
	if(nl.getLength() == 0) {
	    element=root.createElement(header);
	    xml_header.appendChild(element);
	} else {
	    element=(Element)nl.item(0);
	}
	return XMLCommon.getElementTextValue(element);
    }
	

    public void setHeader(String header, String value) {
	Element xml_header=getHeader();
	NodeList nl=xml_header.getElementsByTagName(header);
	Element element;
	if(nl.getLength() == 0) {
	    element=root.createElement(header);
	    xml_header.appendChild(element);
	} else {
	    element=(Element)nl.item(0);
	}
	XMLCommon.setElementTextValue(element,value);
    }

    
    protected boolean isReply(String subject) {
	String s=subject.toUpperCase();
	return s.startsWith("RE") || s.startsWith("AW");
    }

    protected Element getFirstMessageTextPart(Element parent) {
	NodeList nl=parent.getChildNodes();
	// Modified by exce, start
	/**
	 * Maybe here we should modify the algorithm:
	 * If no appropriate text/plain is found, try to search for text/html.
	 */
	// Modified by exce, end
	for(int i=0;i<nl.getLength();i++) {
	    Element elem=(Element)nl.item(i);
	    if(elem.getTagName().equals("PART")) {
		if(elem.getAttribute("type").equals("multi")) {
		    Element retval=getFirstMessageTextPart(elem);
		    if(retval!=null) {
			return retval;
		    }
		} else if(elem.getAttribute("type").equals("text")) {
		    return elem;
		}			
	    }
	}
	// Modified by exce, start
	for(int i=0;i<nl.getLength();i++) {
	    Element elem=(Element)nl.item(i);
	    if(elem.getTagName().equals("PART")) {
		if(elem.getAttribute("type").equals("multi")) {
		    Element retval=getFirstMessageTextPart(elem);
		    if(retval!=null) {
			return retval;
		    }
		} else if(elem.getAttribute("type").equals("html")) {
			return elem;
		}			
	    }
	}
	// Modified by exce, end
	return null;
    }	

    public XMLMessagePart getFirstMessageTextPart() {
	return new XMLMessagePart(getFirstMessageTextPart(message));
    }

    public XMLMessagePart getFirstMessageMultiPart() {
	NodeList nl=message.getChildNodes();
	for(int i=0;i<nl.getLength();i++) {
	    Element elem=(Element)nl.item(i);
	    if(elem.getTagName().equals("PART")) {
		if(elem.getAttribute("type").equals("multi")) {
		    return new XMLMessagePart(elem);
		}			
	    }
	}
	return null;
    }	
	

} // XMLMessage