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/*******************************************************************************
 * Copyright (c) 2004, 2008 Tasktop Technologies 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:
 *     Tasktop Technologies - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.tasks.core;

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

import org.eclipse.mylyn.tasks.core.IRepositoryElement;
import org.eclipse.mylyn.tasks.core.ITask;

/**
 * @author Rob Elves
 * @author Mik Kersten
 */
public class ScheduledTaskContainer extends AbstractTaskContainer {

	private final TaskActivityManager activityManager;

	private final String summary;

	private final DateRange range;

	public ScheduledTaskContainer(TaskActivityManager activityManager, DateRange range, String summary) {
		super(summary == null ? range.toString(false) : summary);
		this.activityManager = activityManager;
		this.range = range;
		if (summary == null) {
			this.summary = range.toString(false);
		} else {
			this.summary = summary;
		}
	}

	public ScheduledTaskContainer(TaskActivityManager taskActivityManager, DateRange day) {
		this(taskActivityManager, day, null);
	}

	public boolean isFuture() {
		return !isPresent() && range.getStartDate().after(Calendar.getInstance());
	}

	public boolean isPresent() {
		return range.getStartDate().before(Calendar.getInstance()) && range.getEndDate().after(Calendar.getInstance());
	}

	public boolean isWeekDay() {
		return TaskActivityUtil.getCurrentWeek().isCurrentWeekDay(range);
	}

	public boolean isToday() {
		return isPresent()
				&& range.getStartDate().get(Calendar.DAY_OF_YEAR) == range.getEndDate().get(Calendar.DAY_OF_YEAR);
	}

//	public Collection<ITask> getChildren() {
//		Set<ITask> children = new HashSet<ITask>();
//		Calendar beginning = TaskActivityUtil.getCalendar();
//		beginning.setTimeInMillis(0);
//		if (isFloating() && !isFuture()) {
//			for (ITask task : activityManager.getScheduledTasks(rangebeginning, getEndDate())) {
//				if (task.internalIsFloatingScheduledDate()) {
//					children.add(task);
//				}
//			}
//		} else if (isPresent()) {
//			// add all due/overdue
//			Calendar end = TaskActivityUtil.getCalendar();
//			end.set(5000, 12, 1);
//			for (ITask task : activityManager.getDueTasks(beginning, getEndDate())) {
//				if (activityManager.isOwnedByUser(task)) {
//					children.add(task);
//				}
//			}
//
//			// add all scheduled/overscheduled
//			for (ITask task : activityManager.getScheduledTasks(beginning, getEndDate())) {
//				if (!task.internalIsFloatingScheduledDate() && !task.isCompleted()) {
//					children.add(task);
//				}
//			}
//
//			// if not scheduled or due in future, and is active, place in today bin
//			ITask activeTask = activityManager.getActiveTask();
//			if (activeTask != null && !children.contains(activeTask)) {
//				Set<ITask> futureScheduled = activityManager.getScheduledTasks(getStartDate(), end);
//				for (ITask task : activityManager.getDueTasks(getStartDate(), end)) {
//					if (activityManager.isOwnedByUser(task)) {
//						futureScheduled.add(task);
//					}
//				}
//				if (!futureScheduled.contains(activeTask)) {
//					children.add(activeTask);
//				}
//			}
//		} else if (isFuture()) {
//			children.addAll(activityManager.getScheduledTasks(getStartDate(), getEndDate()));
//			for (ITask task : activityManager.getDueTasks(getStartDate(), getEndDate())) {
//				if (activityManager.isOwnedByUser(task)) {
//					children.add(task);
//				}
//			}
//		} else {
//			children.addAll(activityManager.getActiveTasks(range.getStartDate(), range.getEndDate()));
//		}
//		return children;
//	}

	@Override
	public Collection<ITask> getChildren() {

		// TODO: Cache this information until the next modification to pertinent data

		Set<ITask> children = new HashSet<ITask>();

		// All tasks scheduled for this date range
		for (ITask task : activityManager.getScheduledTasks(range)) {
			if (!task.isCompleted()) {
				children.add(task);
			}
		}

		// Add due tasks if not the This Week container
		if (!(range instanceof WeekDateRange && isPresent())) {
			for (ITask task : activityManager.getDueTasks(range.getStartDate(), range.getEndDate())) {
				if (activityManager.isOwnedByUser(task)) {
					children.add(task);
				}
			}
		}

		// All over due/scheduled tasks are present in the Today folder
		if (isToday()) {
			for (ITask task : activityManager.getOverScheduledTasks()) {
				if (task instanceof AbstractTask && !((AbstractTask) task).getScheduledForDate().isWeek()) {
					children.add(task);
				}
			}
			children.addAll(activityManager.getOverDueTasks());
			// if not scheduled or due in future, and is active, place in today bin
			ITask activeTask = activityManager.getActiveTask();
			if (activeTask != null && !children.contains(activeTask)) {
				children.add(activeTask);
			}
		}

		if (range.isThisWeek()) {
			for (ITask task : activityManager.getOverScheduledTasks()) {
				if (task instanceof AbstractTask && ((AbstractTask) task).getScheduledForDate().isWeek()) {
					children.add(task);
				}
			}
		}

		return children;
	}

	@Override
	public String getSummary() {
		if (summary != null) {
			return summary;
		}
		return range.toString();
	}

	@Override
	public String getHandleIdentifier() {
		return summary;
	}

	@Override
	public String getPriority() {
		return "";
	}

	@Override
	public String getUrl() {
		return "";
	}

	@Override
	public int compareTo(IRepositoryElement element) {
		if (element instanceof ScheduledTaskContainer) {
			ScheduledTaskContainer container = ((ScheduledTaskContainer) element);
			return range.compareTo(container.getDateRange());
		}
		return 0;
	}

	public DateRange getDateRange() {
		return range;
	}

	@SuppressWarnings("unchecked")
	@Override
	public Object getAdapter(Class adapter) {
		return null;
	}

	public Calendar getEnd() {
		return range.getEndDate();
	}

	public Calendar getStart() {
		return range.getStartDate();
	}

	public boolean includes(Calendar pastWeeksTaskStart) {
		return range.includes(pastWeeksTaskStart);
	}

}

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