/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * <BR><BR>
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * <BR><BR>
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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.
 *
 * <BR><BR>
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */
package org.greenstone.gatherer.msm;

/**
 * Title:        The Gatherer<br>
 * Description:  The Gatherer: a tool for gathering and enriching digital collections.<br>
 * Copyright:    Copyright (c) 2001<br>
 * Company:      The University of Waikato<br>
 * @author John Thompson, Greenstone Digital Libraries
 * @version 2.1
 */
import java.awt.AWTEvent;
import java.io.*;
import org.greenstone.gatherer.file.FileNode;
import org.greenstone.gatherer.msm.ElementWrapper;
import org.greenstone.gatherer.msm.Metadata;
import org.greenstone.gatherer.msm.MSMAction;
import org.greenstone.gatherer.valuetree.GValueModel;
/** An event object which contains useful information about the event that generated it, which in this case is probably an element update (this means a MSMAction object should be provided). */
public class MSMEvent
    extends AWTEvent {
    /** The element associated with this event. */
    private ElementWrapper element = null;
    /** The file associated with this event. */
    private File file = null;
    /** The record associated with this event. */
    private FileNode record = null;
    /** The value tree model after adding a new value. */
    private GValueModel new_model = null;
    /** The value tree model prior to adding a new value. */
    private GValueModel old_model = null;
    /** The action initiated by the user which caused this event, if any */
    private int action = -1;
    /** A unique id given to any file or metadata task so it can be undone in its entirity. */
    private long id;
    /** The new metadata associated with this event. */
    private Metadata new_metadata = null;
    /** The old metadata associated with this event. */
    private Metadata old_metadata = null;
    /** The profile associated with this event. */
    private MSMAction profile = null;
    /** The value associated with this event. */
    private String value = null;
    /** The message counter. */
    static private int count = 0;
    /** Constructor.
     * @param source The <strong>Object</strong> that caused this event.
     * @param id An <i>long</i> identifier.
     * @param element The <strong>ElementWrapper</strong> affected.
     */
    public MSMEvent(Object source, long id, ElementWrapper element, GValueModel old_model, GValueModel new_model) {
	super(source, 0);
	this.element = element;
	this.id = id;
	this.new_model = new_model;
	this.old_model = old_model;
	this.profile = null;
	this.record = null;
    }
    /** Constructor for a metadata change event involving a file. */
    public MSMEvent(Object source, long id, File file, Metadata old_metadata, Metadata new_metadata) {
	super(source, 0);
	this.element = null;
	this.file = file;
	this.id = id;
	this.new_metadata = new_metadata;
	this.old_metadata = old_metadata;
	this.profile = null;
    }
    /** Constructor for a metadata change event involving a filenode. */
    public MSMEvent(Object source, long id, FileNode record, Metadata old_metadata, Metadata new_metadata, int action) {
	super(source, 0);
	this.action = action;
	this.element = null;
	this.id = id;
	this.new_metadata = new_metadata;
	this.old_metadata = old_metadata;
	this.record = record;
	this.profile = null;
    }
    /** Constructor.
     * @param source The <strong>Object</strong> that caused this event.
     * @param id An <i>long</i> identifier.
     * @param profile The <strong>MSMAction</strong> profile if one is applicable.
     */
    public MSMEvent(Object source, long id, MSMAction profile) {
	super(source, 00);
	this.element = null;
	this.id = id;
	this.record = null;
	this.profile = profile;
    }
    /** Constructor for a metadata element changed event. 
     * @param source The <strong>Object</strong> that caused this event.
     * @param element A reference to the effected metadata <strong>ElementWrapper</strong>, or <i>null</i> if element no longer exists.
     * @param value The old name of the element (if its name has changed). If <i>null</i> old name defaults to element.toString().
     */
    public MSMEvent(Object source, ElementWrapper element, String value) {
	super(source, count++);
	this.element = element;
	this.value = value;
    }

    /** Retrieve the code of the user action that fired this event.
     * @return the action as an int
     */
    public int getAction() {
	return action;
    }

    /** Method to retrieve of the element associated with this event.
     * @return A <strong>ElementWrapper</strong>, or <i>null</i> if there is none.
     */
    public ElementWrapper getElement() {
	return element;
    }

    public File getFile() {
	return file;
    }
    /** Method to retrieve the new metadata associated with this event.
     * @return A <strong>Metadata</strong>, or <i>null</i> if there is none.
     */
    public Metadata getNewMetadata() {
	return new_metadata;
    } 
    /* private GValueModel getNewModel() {
	return new_model;
	} */
    /** Method to retrieve the old metadata associated with this event.
     * @return A <strong>Metadata</strong>, or <i>null</i> if there is none.
     */
    public Metadata getOldMetadata() {
	return old_metadata;
    } 
    /* private GValueModel getOldModel() {
	return old_model;
	} */
    /** Method to retrieve of the profile associated with this event.
     * @return A <strong>MSMAction</strong> which details the action profile, or <i>null</i> if no profile exists.
     */
    /* private MSMAction getProfile() {
	return profile;
	} */
    /** Retrieve the record associated with this event. */
    public FileNode getRecord() {
	return record;
    }
    /** Retrieve the associated with this event.
     * @return A <strong>String</strong>.
     */
    public String getValue() {
	String result = null;
	if(value != null) {
	    result = value;
	}
	else if(element != null) {
	    result = element.toString();
	}
	return result;
    }
    public long ID() {
	return id;
    }

    public String toString() {
	StringBuffer text = new StringBuffer("");
	if(old_metadata != null) {
	    text.append(old_metadata.toString());
	}
	text.append(" => ");
	if(new_metadata != null) {
	    text.append(new_metadata.toString());
	}
	return text.toString();
    }
}