Tag.java

package br.com.caelum.guj.model;

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

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

@Entity
@Table(name = "tags")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Tag {

	@Id
	@GeneratedValue
	private int id;

	@Column(nullable = false, unique = true)
	private String name;

	@ManyToMany(mappedBy = "tags")
	@JoinTable(name = "article_tags")
	private List<Article> articles = new ArrayList<Article>();

	public int getId() {
		return this.id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	/**
	 * @param articles
	 *            the articles to set
	 */
	public void setArticles(List<Article> articles) {
		this.articles = articles;
	}

	/**
	 * @return the articles
	 */
	public List<Article> getArticles() {
		return this.articles;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((this.name == null) ? 0 : this.name.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null) {
			return false;
		}
		if (this.getClass() != obj.getClass()) {
			return false;
		}
		Tag other = (Tag) obj;
		if (this.name == null) {
			if (other.name != null) {
				return false;
			}
		} else if (!this.name.equals(other.name)) {
			return false;
		}
		return true;
	}
}