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/*
GanttProject is an opensource project management tool.
Copyright (C) 2011 GanttProject team
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 3
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package net.sourceforge.ganttproject.task.dependency.constraint;
import java.util.Calendar;
import java.util.Date;
import net.sourceforge.ganttproject.GanttCalendar;
import net.sourceforge.ganttproject.GanttTaskRelationship;
import net.sourceforge.ganttproject.language.GanttLanguage;
import net.sourceforge.ganttproject.task.Task;
import net.sourceforge.ganttproject.task.TaskActivity;
import net.sourceforge.ganttproject.task.dependency.TaskDependency;
import net.sourceforge.ganttproject.task.dependency.TaskDependencyConstraint;
import net.sourceforge.ganttproject.task.dependency.TaskDependency.ActivityBinding;
/**
* Dependent task starts not earlier than dependee starts
* @author bard
*/
public class StartStartConstraintImpl extends ConstraintImpl implements
TaskDependencyConstraint {
public StartStartConstraintImpl() {
super(GanttTaskRelationship.SS, GanttLanguage.getInstance().getText(
"startstart"));
}
@Override
public TaskDependencyConstraint.Collision getCollision() {
TaskDependencyConstraint.Collision result = null;
Task dependee = getDependency().getDependee();
Task dependant = getDependency().getDependant();
GanttCalendar dependeeStart = dependee.getStart();
GanttCalendar dependantStart = dependant.getStart();
int difference = getDependency().getDifference();
GanttCalendar comparisonDate = dependeeStart.clone();
comparisonDate.add(Calendar.DATE, difference);
boolean isActive = getDependency().getHardness()==TaskDependency.Hardness.RUBBER ? dependantStart
.compareTo(comparisonDate) < 0 : dependantStart
.compareTo(comparisonDate) != 0;
// GanttCalendar acceptableStart = dependee.getStart();
GanttCalendar acceptableStart = dependee.getStart().clone();
addDelay(acceptableStart);
result = new TaskDependencyConstraint.DefaultCollision(acceptableStart,
TaskDependencyConstraint.Collision.START_LATER_VARIATION,
isActive);
return result;
}
@Override
public Collision getBackwardCollision(Date dependantStart) {
Task dependee = getDependency().getDependee();
GanttCalendar dependeeEnd = dependee.getEnd().clone();
Date barrier = shift(
dependantStart,
dependee.getDuration().getLength() - getDependency().getDifference());
boolean isActive = getDependency().getHardness() == TaskDependency.Hardness.RUBBER ?
dependeeEnd.getTime().compareTo(barrier) > 0
: dependeeEnd.getTime().compareTo(barrier) != 0;
return new TaskDependencyConstraint.DefaultCollision(
new GanttCalendar(barrier),
TaskDependencyConstraint.Collision.START_EARLIER_VARIATION,
isActive);
}
@Override
public ActivityBinding getActivityBinding() {
TaskActivity[] dependantActivities = getDependency().getDependant()
.getActivities();
TaskActivity[] dependeeActivities = getDependency().getDependee()
.getActivities();
TaskActivity theDependant = dependantActivities[0];
TaskActivity theDependee = dependeeActivities[0];
return new DependencyActivityBindingImpl(theDependant, theDependee,
new Date[] { theDependant.getStart(), theDependee.getStart() });
}
}
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