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A application used to translate RSQL nodes to JPA Criteria Query.
There is a newer version: 2.0.2
/*
 * The MIT License
 *
 * Copyright 2015 Antonio Rabelo.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.github.tennaito.rsql.jpa;

import java.util.logging.Level;
import java.util.logging.Logger;

import javax.persistence.EntityManager;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.From;

import cz.jirutka.rsql.parser.ast.AndNode;
import cz.jirutka.rsql.parser.ast.ComparisonNode;
import cz.jirutka.rsql.parser.ast.OrNode;
import cz.jirutka.rsql.parser.ast.RSQLVisitor;

/**
 * JpaCriteriaQueryVisitor
 *
 * Visitor class for Criteria Query creation from RSQL AST Nodes.
 *
 * @author AntonioRabelo
 *
 * @param  Entity type
 */
public class JpaCriteriaQueryVisitor extends AbstractJpaVisitor, T>  implements RSQLVisitor, EntityManager> {

	private static final Logger LOG = Logger.getLogger(JpaCriteriaQueryVisitor.class.getName());

	private final JpaPredicateVisitor predicateVisitor;
	
	/**
	 * Construtor with template varargs for entityClass discovery.
	 *
	 * @param t not for usage
	 */
	public JpaCriteriaQueryVisitor(T... t) {
		super(t);
		this.predicateVisitor = new JpaPredicateVisitor(t);
	}
	
	/**
	 * Get the Predicate Visitor instance.
	 * 
	 * @return Return the Predicate Visitor.
	 */
	protected JpaPredicateVisitor getPredicateVisitor() {
		this.predicateVisitor.setBuilderTools(this.getBuilderTools());
		return this.predicateVisitor;
	}

	/* (non-Javadoc)
	 * @see cz.jirutka.rsql.parser.ast.RSQLVisitor#visit(cz.jirutka.rsql.parser.ast.AndNode, java.lang.Object)
	 */
	public CriteriaQuery visit(AndNode node, EntityManager entityManager) {
		LOG.log(Level.INFO, "Creating CriteriaQuery for AndNode: {0}", node);
		CriteriaQuery criteria = entityManager.getCriteriaBuilder().createQuery(entityClass);
    	From root = criteria.from(entityClass);
		return criteria.where(this.getPredicateVisitor().defineRoot(root).visit(node, entityManager));
	}

	/* (non-Javadoc)
	 * @see cz.jirutka.rsql.parser.ast.RSQLVisitor#visit(cz.jirutka.rsql.parser.ast.OrNode, java.lang.Object)
	 */
	public CriteriaQuery visit(OrNode node, EntityManager entityManager) {
		LOG.log(Level.INFO, "Creating CriteriaQuery for OrNode: {0}", node);
		CriteriaQuery criteria = entityManager.getCriteriaBuilder().createQuery(entityClass);
    	From root = criteria.from(entityClass);
		return criteria.where(this.getPredicateVisitor().defineRoot(root).visit(node, entityManager));
	}

	/* (non-Javadoc)
	 * @see cz.jirutka.rsql.parser.ast.RSQLVisitor#visit(cz.jirutka.rsql.parser.ast.ComparisonNode, java.lang.Object)
	 */
	public CriteriaQuery visit(ComparisonNode node, EntityManager entityManager) {
		LOG.log(Level.INFO, "Creating CriteriaQuery for ComparisonNode: {0}", node);
    	CriteriaQuery criteria = entityManager.getCriteriaBuilder().createQuery(entityClass);
    	From root = criteria.from(entityClass);
    	return criteria.where(this.getPredicateVisitor().defineRoot(root).visit(node, entityManager));
	}
}