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JPA Cloner allows cloning of JPA entity subgraphs.

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/*   JPA cloner project.
 *   
 *   Copyright (C) 2013 Miroslav Nociar
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see 
 */
package sk.nociar.jpacloner;

import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import sk.nociar.jpacloner.graphs.GraphExplorer;
import sk.nociar.jpacloner.graphs.PropertyFilter;

/**
 * Generic explorer of JPA entities. Explored entities can be accessed by the method {@link #getEntities(Class)}.
 * 
 * @author Miroslav Nociar
 *
 */
public class JpaExplorer extends AbstractJpaExplorer {
	
	private final Set entities = new HashSet();
	
	public JpaExplorer() {
		super();
	}
	
	public JpaExplorer(PropertyFilter propertyFilter) {
		super(propertyFilter);
	}
	
	@Override
	protected void explore(Object entity, String property, Collection collection) {
		for (Object object : collection) {
			addJpaObject(object);
		}
	}

	@Override
	protected void explore(Object entity, String property, Map map) {
		for (Map.Entry entry : map.entrySet()) {
			addJpaObject(entry.getKey());
			addJpaObject(entry.getValue());
		}
	}

	@Override
	protected void explore(Object entity, String property, Object value) {
		addJpaObject(value);
	}

	private void addJpaObject(Object object) {
		if (getClassInfo(object) != null) {
			entities.add(object);
		}
	}
	
	/**
	 * Returns all explored entities of the given class.
	 * 
	 * @param clazz the entity class
	 * @return a set of explored entities of the given class
	 */
	public  Set getEntities(Class clazz) {
		Set set = new HashSet();
		for (Object entity : entities) {
			if (clazz.isInstance(entity)) {
				set.add(clazz.cast(entity));
			}
		}
		return set;
	}

	/**
	 * Explores the passed JPA entity. The explored relations are specified by string patters. 
	 * For description of patterns see the {@link GraphExplorer}.
	 */
	public static JpaExplorer doExplore(Object root, String... patterns) {
		JpaExplorer jpaExplorer = new JpaExplorer();
		jpaExplorer.addJpaObject(root);
		if (patterns != null) {
			for (String pattern : patterns) {
				GraphExplorer graphExplorer = GraphExplorer.get(pattern);
				graphExplorer.explore(Collections.singleton(root), jpaExplorer);
			}
		}
		return jpaExplorer;
	}
	
	/**
	 * Explores the passed JPA entity. The explored relations are specified by string patters. 
	 * For description of patterns see the {@link GraphExplorer}.
	 */
	public static JpaExplorer doExplore(Object root, PropertyFilter propertyFilter, String... patterns) {
		JpaExplorer jpaExplorer = new JpaExplorer(propertyFilter);
		jpaExplorer.addJpaObject(root);
		if (patterns != null) {
			for (String pattern : patterns) {
				GraphExplorer graphExplorer = GraphExplorer.get(pattern);
				graphExplorer.explore(Collections.singleton(root), jpaExplorer);
			}
		}
		return jpaExplorer;
	}

	/**
	 * Explores a collection of JPA entities. The explored relations are specified by string patters. 
	 * For description of patterns see the {@link GraphExplorer}.
	 */
	public static JpaExplorer doExplore(Collection collection, String... patterns) {
		JpaExplorer jpaExplorer = new JpaExplorer();
		if (patterns != null) {
			for (String pattern : patterns) {
				GraphExplorer graphExplorer = GraphExplorer.get(pattern);
				graphExplorer.explore(collection, jpaExplorer);
			}
		}
		for (Object root : collection) {
			jpaExplorer.addJpaObject(root);
		}
		return jpaExplorer;
	}

}
 















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