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JPA support for Querydsl
There is a newer version: 5.1.0
/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.querydsl.jpa;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import com.google.common.collect.ImmutableMap;
import com.querydsl.core.types.Operator;
import com.querydsl.core.types.Ops;

/**
 * HQLTemplates extends {@link JPQLTemplates} with Hibernate specific extensions
 *
 * @author tiwe
 *
 */
public class HQLTemplates extends JPQLTemplates {

    private static final QueryHandler QUERY_HANDLER;

    static {
        QueryHandler instance;
        try {
            instance = (QueryHandler) Class.forName("com.querydsl.jpa.HibernateHandler").newInstance();
        } catch (NoClassDefFoundError e) {
            instance = DefaultQueryHandler.DEFAULT;
        } catch (Exception e) {
            instance = DefaultQueryHandler.DEFAULT;
        }
        QUERY_HANDLER = instance;
    }

    private static final List wrapElements = Arrays. asList(
            Ops.QuantOps.ALL,
            Ops.QuantOps.ANY,
            Ops.QuantOps.AVG_IN_COL,
            Ops.EXISTS);

    public static final HQLTemplates DEFAULT = new HQLTemplates();

    private final Map, String> typeNames;

    public HQLTemplates() {
        this(DEFAULT_ESCAPE);
    }

    @SuppressWarnings("unchecked")
    public HQLTemplates(char escape) {
        super(escape, QUERY_HANDLER);

        ImmutableMap.Builder, String> builder = ImmutableMap.builder();
        builder.put(Byte.class, "byte");
        builder.put(Short.class, "short");
        builder.put(Integer.class, "integer");
        builder.put(Long.class, "long");
        builder.put(BigInteger.class, "big_integer");
        builder.put(Float.class, "float");
        builder.put(Double.class, "double");
        builder.put(BigDecimal.class, "big_decimal");
        typeNames = builder.build();

        // add Hibernate Spatial mappings, if on classpath
        try {
            Class cl = Class.forName("com.querydsl.spatial.hibernate.HibernateSpatialSupport");
            add((Map) cl.getMethod("getSpatialOps").invoke(null));
        } catch (Exception e) {
            // do nothing
        }
    }

    @Override
    public boolean wrapElements(Operator operator) {
        return wrapElements.contains(operator);
    }

    @Override
    public String getTypeForCast(Class cl) {
        return typeNames.get(cl);
    }

    @Override
    public String getExistsProjection() {
        return "1";
    }

    @Override
    public boolean wrapConstant(Object constant) {
        // related : https://hibernate.onjira.com/browse/HHH-6913
        Class type = constant.getClass();
        return type.isArray() || Collection.class.isAssignableFrom(type);
    }

    @Override
    public boolean isWithForOn() {
        return true;
    }

    @Override
    public boolean isCaseWithLiterals() {
        return true;
    }

}