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Easiest solution to save and query JPA entities
There is a newer version: 3.2.4
package br.eti.clairton.repository;

import static br.eti.clairton.repository.Comparators.EQUAL;
import static br.eti.clairton.repository.Operators.AND;
import static javax.persistence.criteria.JoinType.INNER;

import java.io.Serializable;

import javax.persistence.criteria.JoinType;
import javax.persistence.metamodel.Attribute;
import javax.validation.constraints.NotNull;

/**
 * Predicado para consulta.
 * 
 * @author Clairton Rodrigo Heinzen [email protected]
 */
public class Predicate implements Serializable {
	private static final long serialVersionUID = 1L;

	private Object value;

	private Attribute[] attributes;

	private JoinType joinType = INNER;

	private Comparator comparator = EQUAL;

	private Operator operator = AND;

	public  Predicate(final @NotNull T value, 
			final @NotNull Attribute... attributes) {
		this(value, INNER, EQUAL, AND, attributes);
	}

	public  Predicate(final @NotNull Operator operator, 
			final @NotNull T value, 
			final @NotNull Attribute... attribute) {
		this(value, INNER, EQUAL, operator, attribute);
	}

	public  Predicate(final @NotNull T value, 
			final @NotNull Comparator comparator, 
			final @NotNull Attribute... attribute) {
		this(value, INNER, comparator, AND, attribute);
	}

	public Predicate(final @NotNull Attribute... attribute) {
		this(null, INNER, EQUAL, AND, attribute);
	}

	public Predicate(final @NotNull Comparator comparator, 
			final @NotNull Attribute... attribute) {
		this(null, INNER, comparator, AND, attribute);
	}

	public Predicate(final @NotNull JoinType joinType, 
			final @NotNull Comparator comparator,
			final @NotNull Attribute... attribute) {
		this(null, joinType, comparator, AND, attribute);
	}

	public  Predicate(final @NotNull T value, JoinType joinType,
			final @NotNull Comparator comparator,
			final @NotNull Operator operator,
			final @NotNull Attribute... attribute) {
		super();
		this.value = value;
		this.attributes = attribute;
		this.joinType = joinType;
		this.comparator = comparator;
		this.operator = operator;
	}

	public Attribute[] getAttributes() {
		return attributes;
	}

	public Attribute getAttribute() {
		return attributes[0];
	}

	public  void setValue(final @NotNull T value) {
		this.value = value;
	}

	@SuppressWarnings("unchecked")
	public  T getValue() {
		return (T) value;
	}

	public Comparator getComparator() {
		return comparator;
	}

	public Operator getOperator() {
		return operator;
	}

	public JoinType getJoinType() {
		return joinType;
	}

	public void setJoinType(final @NotNull JoinType joinType) {
		this.joinType = joinType;
	}

	public void setValueObject(final @NotNull Object value) {
		this.value = value;
	}

	@Override
	public String toString() {
		return joinType.toString() + " " + path() + " " + comparator.toString() + " " + value.toString();
	}

	private String path() {
		final StringBuilder path = new StringBuilder();
		String separator = "";
		for (final Attribute a : attributes) {
			path.append(separator + a.getName());
			separator = ".";
		}
		return path.toString();
	}
}