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/*******************************************************************************
* Copyright (c) 2004 - 2006 University Of British Columbia 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
*
* Contributors:
* University Of British Columbia - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.views;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.mylyn.context.core.ContextCorePlugin;
import org.eclipse.mylyn.monitor.core.InteractionEvent;
import org.eclipse.mylyn.monitor.core.StatusHandler;
import org.eclipse.mylyn.tasks.core.AbstractTask;
import org.eclipse.mylyn.tasks.ui.TasksUiPlugin;
/**
* @author Ken Sueda (original prototype)
* @author Wesley Coelho (Added persistent tasks)
* @author Mik Kersten (hardening)
* @author Rob Elves
*/
public class TaskActivationHistory {
private List<AbstractTask> history = new ArrayList<AbstractTask>();
private int currentIndex = -1;
/**
* The number of tasks from the previous Eclipse session to load into the
* history at startup. (This is not the maximum size of the history, which
* is currently unbounded)
*/
private static final int NUM_SAVED_HISTORY_ITEMS_TO_LOAD = 12;
private boolean persistentHistoryLoaded = false;
/**
* Load in a number of saved history tasks from previous session. Should be
* called from constructor but ContextManager doesn't seem to be able to
* provide activity history at that point
*
* @author Wesley Coelho
*/
public void loadPersistentHistory() {
int tasksAdded = 0;
history.clear();
for (int i = ContextCorePlugin.getContextManager().getActivityMetaContext().getInteractionHistory()
.size() - 1; i >= 0; i--) {
AbstractTask prevTask = getHistoryTaskAt(i);
if (prevTask != null && !history.contains(prevTask)) {
// !isDuplicate(prevTask, i + 1)) {
history.add(0, prevTask);
currentIndex++;
tasksAdded++;
if (tasksAdded == NUM_SAVED_HISTORY_ITEMS_TO_LOAD) {
break;
}
}
}
persistentHistoryLoaded = true;
}
/**
* Returns the task corresponding to the interaction event history item at
* the specified position
*/
protected AbstractTask getHistoryTaskAt(int pos) {
InteractionEvent event = ContextCorePlugin.getContextManager().getActivityMetaContext()
.getInteractionHistory().get(pos);
return TasksUiPlugin.getTaskListManager().getTaskList().getTask(event.getStructureHandle());
}
public void addTask(AbstractTask task) {
try {
if (!persistentHistoryLoaded) {
loadPersistentHistory();
persistentHistoryLoaded = true;
}
history.remove(task);
history.add(task);
currentIndex = history.size() - 1;
} catch (RuntimeException e) {
StatusHandler.fail(e, "could not add task to history", false);
}
}
public AbstractTask getPreviousTask() {
try {
boolean active = false;
for (AbstractTask task: history) {
if(task.isActive()) {
active = true;
break;
}
}
if (hasPrevious()) {
if ((currentIndex == 0 && !history.get(currentIndex).isActive()) || !active) {
return history.get(currentIndex);
} else {
return history.get(--currentIndex);
}
} else {
return null;
}
} catch (RuntimeException e) {
StatusHandler.fail(e, "could not get previous task from history", false);
return null;
}
}
public List<AbstractTask> getPreviousTasks() {
return history;
}
public boolean hasPrevious() {
try {
if (!persistentHistoryLoaded) {
loadPersistentHistory();
persistentHistoryLoaded = true;
}
return (currentIndex == 0 && !history.get(currentIndex).isActive()) || currentIndex > 0;
} catch (RuntimeException e) {
StatusHandler.fail(e, "could determine previous task", false);
return false;
}
}
public void clear() {
try {
history.clear();
currentIndex = -1;
} catch (RuntimeException e) {
StatusHandler.fail(e, "could not clear history", false);
}
}
}
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