Entidade.java

package br.com.dextra.dextranet.persistencia;

import java.util.UUID;

import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;

public abstract class Entidade {

	protected String id;

	public Entidade() {
		this.id = UUID.randomUUID().toString();
	}

	public Entidade(String id) {
		this.id = id;
	}

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

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

	public <T extends Entidade> Key getKey(Class<T> clazz) {
		return KeyFactory.createKey(clazz.getName(), this.getId());
	}

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

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

}