TaskStack Code

/**
 * Copyright 2011 Juan Gabriel Carrera Otero
 * 
 * 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 net.xan.taskstack;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.PostLoad;
import javax.persistence.Transient;

import lombok.Data;
import lombok.NoArgsConstructor;
import net.xan.easyjtable.Editable;
import net.xan.easyjtable.Title;
import net.xan.easyjtable.Visible;

import org.eclipse.persistence.annotations.Convert;
import org.eclipse.persistence.annotations.Converter;
import org.eclipse.persistence.annotations.PrivateOwned;
import org.joda.time.DateTime;
import org.joda.time.Duration;

/**
 * 
 * @author xandacona 
 */
@Data
@Entity
@NoArgsConstructor
public class Task {

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Editable(value = false)
	@Title(value = "Task Id")
	protected Integer		id;

	@ManyToOne
	@Editable(value = false)
	@Title(value = "Owner")
	protected Person		owner;

	@Transient
	@Editable(value = true)
	@Visible(value = false)
	protected List<Task>	interruptions	= new ArrayList<Task>();

	@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
	@PrivateOwned
	@JoinColumn(name = "task_id")
	@Editable(value = false)
	@Visible(value = false)
	protected List<Session>	sessions;

	@Title(value = "Task")
	protected String		name;

	@Column(columnDefinition = "TIMESTAMP")
	@Converter(name = "dateTimeConverter", converterClass = net.xan.taskstack.JodaDateTimeConverter.class)
	@Convert("dateTimeConverter")
	@Editable(value = false)
	@Title(value = "Init Time")
	protected DateTime		initTime;

	@Column(columnDefinition = "TIMESTAMP")
	@Converter(name = "dateTimeConverter", converterClass = net.xan.taskstack.JodaDateTimeConverter.class)
	@Convert("dateTimeConverter")
	@Title(value = "Finish Time")
	protected DateTime		endTime;

	@Transient
	@Editable(value = false)
	@Title(value = "Duration")
	protected Duration		duration;

	@Title(value = "State")
	protected TaskState		state;

	public Task(Person owner, String name) {
		this.owner = owner;
		this.name = name;
		this.initTime = new DateTime();
		this.endTime = null;
		this.duration = null;
		this.state = TaskState.Running;
		this.sessions = new ArrayList<Session>();
		this.interruptions = new ArrayList<Task>();
	}

	public void close() {
		if (this.state == TaskState.Running) {
			closeCurrentSession();
		}
		this.state = TaskState.Closed;
	}

	public void interrupt(Task task) {
		this.state = TaskState.Stalled;
		this.interruptions.add(task);
		closeCurrentSession();
	}

	public Session closeCurrentSession() {
		switch (this.state) {
		case Running:
			return closeCurrentSession(new DateTime());
		case Stalled:
			return closeCurrentSession(this.sessions.get(this.sessions.size() - 1).getEndTime());
		default:
			return null;
		}
	}

	private Session closeCurrentSession(DateTime end) {
		if (this.sessions.isEmpty()) {
			return null;
		}

		// TODO: TO LESS STEPS
		Session last = this.sessions.remove(this.sessions.size() - 1);
		last.setEndTime(end);
		this.sessions.add(last);
		recalculateDuration();
		this.endTime = end;
		return last;
	}

	public Session startSession(Person person) {
		return startSession(new DateTime(), person);
	}

	public Session startSession(DateTime init, Person person) {
		// closeCurrentSession(init);
		Session session = new Session(init, (DateTime) null, person);
		this.sessions.add(session);
		return session;
	}

	@PostLoad
	public Duration recalculateDuration() {
		this.duration = new Duration(0);
		for (Session i : this.sessions) {
			this.duration = this.duration.plus(new Duration(i.getStartTime(), i.getEndTime()));
		}
		return this.duration;
	}

	public Duration interruptionsDuration() {
		Duration d = new Duration(Duration.ZERO);
		if (this.interruptions != null) {
			for (Task t : this.interruptions) {
				if (t.duration != null) {
					d = d.plus(t.duration);
				}
			}
		}
		return d;
	}

	@Override
	public boolean equals(Object obj) {
		return obj instanceof Task && this.id.equals(((Task) obj).id);
	}

	public String toLog() {
		recalculateDuration();

		StringBuffer sb = new StringBuffer();
		sb.append("\n >>id=" + this.id);
		sb.append("\n   name=" + this.name);
		sb.append("\n   initTime=" + this.initTime);
		sb.append("\n   endTime=" + this.endTime);
		sb.append("\n   duration=" + TSDurationCellRender.format(this.duration));
		sb.append("\n   state=" + this.state);
		sb.append("\n   SESSIONS:");
		for (Session i : this.sessions) {
			sb.append("\n      " + i);
		}
		sb.append("\n   Interruptions");
		for (Task t : this.interruptions) {
			sb.append("\n      " + t.id + " -- " + t.name);
		}
		return sb.toString();
	}

}