flowdiagramelementmodelpart.java

一个java写的business process management系统

/*
 * Copyright (c) 2003, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.model;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

import net.orthanc.flow4j.designer.core.Flow4JPlugin;
import net.orthanc.flow4j.designer.model.propertysources.LocationPropertySource;

import org.eclipse.draw2d.geometry.Point;
import org.eclipse.ui.views.properties.IPropertyDescriptor;
import org.eclipse.ui.views.properties.IPropertySource;
import org.eclipse.ui.views.properties.PropertyDescriptor;

/**
 * @author agreif
 *
 * TODO
 * 
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
/**
 * @author agreif
 *
 * TODO
 * 
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
abstract public class FlowDiagramElementModelPart extends Flow4JModelPart
	implements IPropertySource
{

	public static final String PROP_LOCATION = "location"; //$NON-NLS-1$
	
	private Point location = new Point(0, 0);


	private static Set flowDiagramElementPropertyDescriptors = null;






	


	
	/**
	 * Creates the property descriptors if they have not been
	 * created yet. The following descriptor is added:<br>
	 * descriptor for the location group
	 */
	private void createPropertyDescriptors() {
		if (flowDiagramElementPropertyDescriptors != null)
			return;
		
		flowDiagramElementPropertyDescriptors = new HashSet();
		flowDiagramElementPropertyDescriptors.add(new PropertyDescriptor(PROP_LOCATION, Flow4JPlugin.getResourceString("PropertyDescriptor_FlowDiagramElement.location")));
	}
	
	
	
	/**
	 * Returns the collection of the property descriptors
	 * @return the collection of the property descriptors
	 */
	protected Collection getPropertyDescriptorsCollection() {
		if (flowDiagramElementPropertyDescriptors == null)
			createPropertyDescriptors();
			
		return flowDiagramElementPropertyDescriptors;
	}
	

	/**
	 * Returns useful property flowDiagramElementDescriptors for the use
	 * in property sheets. This supports location.
	 *
	 * @see org.eclipse.ui.views.properties.IPropertySource#getPropertyDescriptors()
	 * @return  Array of property flowDiagramElementescriptors.
	 */
	public IPropertyDescriptor[] getPropertyDescriptors() {
		return (IPropertyDescriptor[])getPropertyDescriptorsCollection().toArray(new IPropertyDescriptor[]{});
	}



	/**
	 * Returns an Object which represents the appropriate
	 * value for the property name supplied.
	 *
	 * @see org.eclipse.ui.views.properties.IPropertySource#getPropertyValue(java.lang.Object)
	 * @param propName  Name of the property for which the
	 *                  the values are needed.
	 * @return  Object which is the value of the property.
	 */
	public Object getPropertyValue(Object propName) {
		if(PROP_LOCATION.equals(propName))
			return new LocationPropertySource(getLocation());
		else
			System.out.println("FlowDiagramElementModelPart.getPropertyValue() unknown propName: " + propName);
			
		return null;
	}

	/**
	 * Sets the value of a given property with the value
	 * supplied. Also fires a property change if necessary.
	 * @see org.eclipse.ui.views.properties.IPropertySource#setPropertyValue(java.lang.Object, java.lang.Object)
	 * @param id  Name of the parameter to be changed.
	 * @param value  Value to be set to the given parameter.
	 */
	public void setPropertyValue(Object id, Object value){
		if (PROP_LOCATION.equals(id)) {
			LocationPropertySource propSource = (LocationPropertySource)value;
			setLocation(new Point(propSource.getValue()));
		} else
			System.out.println("FlowDiagramElementModelPart.setPropertyValue() unknown id: " + id);
	}



	/**
	 * Sets the location property and fires a change event
	 * @param point the new location
	 */
	public void setLocation(Point point) {
		if (location.equals(point))
			return;
		Point old = location.getCopy();
		location = point;
		firePropertyChange(PROP_LOCATION, old, point);
	}


	/**
	 * TODO
	 * @return
	 */
	public Point getLocation() {
		return location;
	}


	/**
	 * @see org.eclipse.ui.views.properties.IPropertySource#getEditableValue()
	 */
	public Object getEditableValue() {
		return this;
	}




	/* (non-Javadoc)
	 * @see org.eclipse.ui.views.properties.IPropertySource#resetPropertyValue(java.lang.Object)
	 */
	public void resetPropertyValue(Object prop) {
	}



	/**
	 * @see org.eclipse.ui.views.properties.IPropertySource#isPropertySet(java.lang.Object)
	 */
	public boolean isPropertySet(Object propName){
		return isPropertySet((String)propName);
	}

	/**
	 * TODO
	 * @param propName
	 * @return
	 */
	protected boolean isPropertySet(String propName){
		return true;
	}



}