/*
* 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="LIBSUBJECT")
public class Subject {
@Id
@GeneratedValue
private int oid;
// persistent fields
@Basic
private String name;
@ManyToMany
private Set<Book> books;
protected Subject() {
// used only by OpenJPA
}
public Subject(String name) {
if (name != null)
name = name.trim();
if ((name == null) || (name.length() <= 0))
throw new IllegalArgumentException("name cannot be empty or null");
this.name = name;
books = new HashSet<Book>();
}
public String getName() {
return name;
}
public List<Book> getBooks() {
return new ArrayList<Book>(books);
}
boolean addBook(Book book) {
if (book != null)
return books.add(book);
return false;
}
boolean removeBook(Book book) {
if (book != null)
return books.remove(book);
return false;
}
public String toString() {
return "category [" + oid + "] \"" + name + "\"";
}
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 Subject) {
Subject oc = (Subject) other;
return oid == oc.oid;
}
return false;
}
}