constraint.java

Owing to the applet Gantt chart source yard, already Chinese melt, Gantt chart can demonstrate a Chi

/**
 *   Copyright 2004 Carlos Silva A.
 * 
 *   Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 * 
 */
package jgantt.model;
import java.util.Date;

public class Constraint  {
	public static final int MODE_END_BEGIN = 0;
	public static final int MODE_END_END= 1;
	public static final int MODE_BEGIN_BEGIN= 2;
	public static final int MODE_BEGIN_END= 3; 
	// datos
	/**
	 * Mode 
	 * <ul>
	 * <li> 1 : EB
	 * <li> 2 : EE
	 * <li> 3 : BE
	 * <li> 4 : BB
	 * </ul>
	 */
	protected byte                mode;
	protected int                 delay;
	
	// asociaciones	
	protected Task                masterTask=null;
	protected Task                slaveTask=null;

	// transientes


	// metodos publicos
	/**
	 * Genera un constraint. Ejecuta {@link Task#addConstraint} para terminar de anexar 
	 */
	public Constraint(Task master, Task slave) throws GanttException {
		masterTask = master;
		slaveTask = slave;
		slaveTask.addConstraint(this);		
	}
	
	/**
	 * Retorna la fecha de partida de la tarea esclava de acuerdo a la informacion de 
	 * la tarea principal.
	 * @return
	 */
	public Date getStartDate(){
		//System.out.println("Constraint.getStartDate() mode="+mode+ " entre "+masterTask.getName()+" y "+ slaveTask.getName());
		Date start=null;
		DateOrganizer dorg = masterTask.project.getDateOrganizer();
		switch (mode) {
			case MODE_END_BEGIN:
				start = masterTask.getFinishDate();
				start = dorg.getNextLaborableDate(start,delay);
				break;
			case MODE_BEGIN_BEGIN:
				start = masterTask.getStartDate();
				start = dorg.getNextLaborableDate(start,delay);
				break;
			case MODE_END_END:
				start = masterTask.getFinishDate();
				start = dorg.getNextLaborableDate(start,delay - slaveTask.getLength());
				break;
			default: // BEGIN_END
				start = masterTask.getStartDate();				
				start = dorg.getNextLaborableDate(start, delay - slaveTask.getLength());
		}
		//System.out.println("   "+start);
		return start;
	}
	/**
	 * Remueve el constraint de los hijos y deja este constraint sin uso.
	 */
	public void remove(){
		// Primero se asigna dirty 		
		slaveTask.setDirty();		
		masterTask.setDirty();
		// y luego se remueven sus links
		masterTask.childConstraints.remove(this);
		slaveTask.constraints.remove(this);
		slaveTask.project.sendChange(new ProjectChange(ProjectChange.CONSTRAINT,slaveTask));
		slaveTask=null;
		masterTask=null;
				
	}

	public Task getMasterTask() {
		return masterTask;
	}

	public Task getSlaveTask() {
		return slaveTask;
	}

	public byte getMode() {
		return mode;
	}

	public void setMode(byte newMode ) {
		mode = newMode;
		slaveTask.setDirty();
		slaveTask.project.sendChange(new ProjectChange(ProjectChange.CONSTRAINT,slaveTask));
	}


	public int getDelay() {
		return delay;
	}

	public void setDelay(int newDelay ) {
		delay = newDelay;
		slaveTask.setDirty();
		slaveTask.project.sendChange(new ProjectChange(ProjectChange.CONSTRAINT,slaveTask));
	}
	
}