/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.openjpa.persistence.models.library;
import java.util.*;
import javax.persistence.*;
@Entity
@Table(name="LIBBOOK")
public class Book {
private static final int WEEKS_TIME_MS = 1000 * 60 * 60 * 24 * 7;
@Id
@GeneratedValue
private int oid;
// persistent fields
@Basic
private String title;
@Basic
@Temporal(value = TemporalType.TIMESTAMP)
private Date dueDate;
@ManyToOne
private Borrower borrower;
@ManyToMany(mappedBy = "books", cascade = CascadeType.PERSIST)
private Set<Subject> subjects;
protected Book() {
// used only by OpenJPA
}
public Book(String title) {
if (title != null)
title = title.trim();
if ((title == null) || (title.length() <= 0))
throw new IllegalArgumentException("Title cannot be empty or null");
this.title = title;
subjects = new HashSet<Subject>();
}
public String getTitle() {
return title;
}
public Borrower getBorrower() {
return borrower;
}
void setBorrower(Borrower borrower) {
if (borrower != null) {
this.borrower = borrower;
// set the due date, one week from today
long one_week_out = System.currentTimeMillis() + WEEKS_TIME_MS;
dueDate = new Date(one_week_out);
}
}
void clearBorrower() {
borrower = null;
dueDate = null;
}
public Date getDueDate() {
return dueDate;
}
public boolean addSubject(Subject subject) {
boolean retv = false;
if ((subject != null) && subject.addBook(this)) {
retv = true;
subjects.add(subject);
}
return retv;
}
public boolean removeSubject(Subject subject) {
boolean retv = false;
if ((subject != null) && subject.removeBook(this)) {
retv = true;
subjects.remove(subject);
}
return retv;
}
public List<Subject> getSubjects() {
if (subjects == null)
return null;
return new ArrayList<Subject>(subjects);
}
public String toString() {
return "book [" + oid + "] \"" + title + "\""
+ ((dueDate == null) ? "" : (" due back: " + dueDate));
}
public int hashCode() {
return oid;
}
/**
* Uses the object's persistent identity value to determine equivalence.
*/
public boolean equals(Object other) {
// standard fare
if (other == this)
return true;
// if the oid is 0, then this object is not persistent.
// in that case, it cannot be considered equivalent to
// other managed or unmanaged objects
if (oid == 0)
return false;
if (other instanceof Book) {
Book ob = (Book) other;
return oid == ob.oid;
}
return false;
}
}