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/*******************************************************************************
* Copyright (c) 2004, 2007 Mylyn project committers and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.core;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.eclipse.mylyn.tasks.core.ITask;
import org.eclipse.mylyn.tasks.core.ITaskContainer;
/**
* @author Ken Sueda (original prototype)
* @author Wesley Coelho (Added persistent tasks)
* @author Mik Kersten (hardening)
* @author Rob Elves
*/
public class TaskActivationHistory {
private final List<AbstractTask> history = new ArrayList<AbstractTask>();
private int currentIndex = -1;
public void addTask(AbstractTask task) {
history.remove(task);
history.add(task);
currentIndex = history.size() - 1;
}
public boolean containsTask(ITask task) {
return history.contains(task);
}
public boolean removeTask(ITask task) {
return history.remove(task);
}
public AbstractTask getPreviousTask() {
boolean active = false;
for (AbstractTask task : history) {
if (task.isActive()) {
active = true;
break;
}
}
if (hasPrevious()) {
if (!active) {
return history.get(currentIndex);
}
if (currentIndex < history.size() - 1 && ((currentIndex == 0 && !history.get(currentIndex).isActive()))) {
return history.get(currentIndex);
} else if (currentIndex > 0 && currentIndex < history.size()) {
return history.get(--currentIndex);
}
}
return null;
}
public List<AbstractTask> getPreviousTasks() {
return Collections.unmodifiableList(new ArrayList<AbstractTask>(history));
}
/**
* Returns task activation history for tasks present in <code>containers</code>
*/
public List<AbstractTask> getPreviousTasks(Set<AbstractTaskContainer> containers) {
if (containers.isEmpty()) {
return getPreviousTasks();
}
Set<ITask> allWorkingSetTasks = new HashSet<ITask>();
for (ITaskContainer container : containers) {
allWorkingSetTasks.addAll(container.getChildren());
}
List<AbstractTask> allScopedTasks = new ArrayList<AbstractTask>(getPreviousTasks());
for (Iterator<AbstractTask> it = allScopedTasks.iterator(); it.hasNext();) {
AbstractTask task = it.next();
if (!allWorkingSetTasks.contains(task)) {
it.remove();
}
}
return Collections.unmodifiableList(allScopedTasks);
}
public boolean hasPrevious() {
return (currentIndex == 0 && !history.get(currentIndex).isActive()) || currentIndex > 0;
}
public void clear() {
history.clear();
currentIndex = -1;
}
public int indexOf(ITask task) {
return history.indexOf(task);
}
public int getSize() {
return history.size();
}
}
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