com.openthinks.libs.sql.entity.key.IdGenerator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of openlibs.sql Show documentation

The lib of java database ORM simple implementation.

The newest version!

package com.openthinks.libs.sql.entity.key;

import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

/**
 * Entity key generator
 * 
 * @author minjdai
 * 
 */
public abstract class IdGenerator {

	private final static Logger logger = Logger.getLogger(IdGenerator.class);
	static Map, IdGenerator> generatorMap = new ConcurrentHashMap, IdGenerator>();
	static {
		generatorMap.put(Object.class, new DefaultIdGenerator());
	}

	public static void register(Class type, IdGenerator generator) {
		generatorMap.put(type, generator);
	}

	public static IdGenerator getGenerator(Class type) {
		IdGenerator generator = generatorMap.get(type);
		if (generator == null) {
			logger.log(Level.WARN, "Can not find this type:" + type + " IdGenerator, use default IdGenerator");
			generator = generatorMap.get(Object.class);
		}
		return generator;
	}

	public abstract String generator();

	static class DefaultIdGenerator extends IdGenerator {
		@Override
		public String generator() {
			return UUID.randomUUID().toString();
		}
	}

}