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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 com.querydsl.core.QueryMetadata;
import com.querydsl.core.support.FetchableSubQueryBase;
import com.querydsl.core.types.*;
import com.querydsl.core.types.dsl.Expressions;

/**
 * {@code JPAQueryBase} is a base Query class for JPA queries
 *
 * @param  result type
 * @param  concrete subtype
 *
 * @author tiwe
 */
public abstract class JPAQueryBase> extends FetchableSubQueryBase implements JPQLQuery {

    protected final JPAQueryMixin queryMixin;

    private final JPQLTemplates templates;

    @SuppressWarnings("unchecked")
    public JPAQueryBase(QueryMetadata md, JPQLTemplates templates) {
        super(new JPAQueryMixin(md));
        super.queryMixin.setSelf((Q) this);
        this.queryMixin = (JPAQueryMixin) super.queryMixin;
        this.templates = templates;
    }

    protected JPQLTemplates getTemplates() {
        return templates;
    }

    protected abstract JPQLSerializer createSerializer();

    protected JPQLSerializer serialize(boolean forCountRow) {
        return serialize(forCountRow, true);
    }

    protected JPQLSerializer serialize(boolean forCountRow, boolean validate) {
        if (validate) {
            if (queryMixin.getMetadata().getJoins().isEmpty()) {
                throw new IllegalArgumentException("No sources given");
            }
        }
        JPQLSerializer serializer = createSerializer();
        serializer.serialize(queryMixin.getMetadata(), forCountRow, null);
        return serializer;
    }

    protected abstract void reset();

    @Override
    public Q fetchJoin() {
        return queryMixin.fetchJoin();
    }

    @Override
    public Q fetchAll() {
        return queryMixin.fetchAll();
    }

    public Q from(EntityPath arg) {
        return queryMixin.from(arg);
    }

    @Override
    public Q from(EntityPath... args) {
        return queryMixin.from(args);
    }

    @SuppressWarnings("unchecked")
    @Override
    public  Q from(CollectionExpression target, Path
 alias) {
        return queryMixin.from(Expressions.as((Path) target, alias));
    }

    @Override
    public 
 Q innerJoin(CollectionExpression target) {
        return queryMixin.innerJoin(target);
    }

    @Override
    public 
 Q innerJoin(CollectionExpressiontarget, Path
 alias) {
        return queryMixin.innerJoin(target, alias);
    }

    @Override
    public 
 Q innerJoin(EntityPath
 target) {
        return queryMixin.innerJoin(target);
    }

    @Override
    public 
 Q innerJoin(EntityPath
 target, Path
 alias) {
        return queryMixin.innerJoin(target, alias);
    }

    @Override
    public 
 Q innerJoin(MapExpression target) {
        return queryMixin.innerJoin(target);
    }

    @Override
    public 
 Q innerJoin(MapExpression target, Path
 alias) {
        return queryMixin.innerJoin(target, alias);
    }

    @Override
    public 
 Q join(CollectionExpression target) {
        return queryMixin.join(target);
    }

    @Override
    public 
 Q join(CollectionExpression target, Path
 alias) {
        return queryMixin.join(target, alias);
    }

    @Override
    public 
 Q join(EntityPath
 target) {
        return queryMixin.join(target);
    }

    @Override
    public 
 Q join(EntityPath
 target, Path
 alias) {
        return queryMixin.join(target, alias);
    }

    @Override
    public 
 Q join(MapExpression target) {
        return queryMixin.join(target);
    }

    @Override
    public 
 Q join(MapExpression target, Path
 alias) {
        return queryMixin.join(target, alias);
    }

    @Override
    public 
 Q leftJoin(CollectionExpression target) {
        return queryMixin.leftJoin(target);
    }

    @Override
    public 
 Q leftJoin(CollectionExpression target, Path
 alias) {
        return queryMixin.leftJoin(target, alias);
    }

    @Override
    public 
 Q leftJoin(EntityPath
 target) {
        return queryMixin.leftJoin(target);
    }

    @Override
    public 
 Q leftJoin(EntityPath
 target, Path
 alias) {
        return queryMixin.leftJoin(target, alias);
    }

    @Override
    public 
 Q leftJoin(MapExpression target) {
        return queryMixin.leftJoin(target);
    }

    @Override
    public 
 Q leftJoin(MapExpression target, Path
 alias) {
        return queryMixin.leftJoin(target, alias);
    }

    @Override
    public 
 Q rightJoin(CollectionExpression target) {
        return queryMixin.rightJoin(target);
    }

    @Override
    public 
 Q rightJoin(CollectionExpression target, Path
 alias) {
        return queryMixin.rightJoin(target, alias);
    }

    @Override
    public 
 Q rightJoin(EntityPath
 target) {
        return queryMixin.rightJoin(target);
    }

    @Override
    public 
 Q rightJoin(EntityPath
 target, Path
 alias) {
        return queryMixin.rightJoin(target, alias);
    }

    @Override
    public 
 Q rightJoin(MapExpression target) {
        return queryMixin.rightJoin(target);
    }

    @Override
    public 
 Q rightJoin(MapExpression target, Path alias) {
        return queryMixin.rightJoin(target, alias);
    }

    public Q on(Predicate condition) {
        return queryMixin.on(condition);
    }

    @Override
    public Q on(Predicate... conditions) {
        return queryMixin.on(conditions);
    }


    @Override
    public String toString() {
        JPQLSerializer serializer = serialize(false, false);
        return serializer.toString().trim();
    }

    @Override
    public abstract Q clone();

}