com.mysema.query.jpa.hibernate.HibernateUpdateClause Maven / Gradle / Ivy

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JPA support for Querydsl
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/*
 * Copyright 2011, Mysema Ltd
 * 
 * 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.mysema.query.jpa.hibernate;

import java.util.List;
import java.util.Map;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.StatelessSession;

import com.mysema.query.DefaultQueryMetadata;
import com.mysema.query.JoinType;
import com.mysema.query.QueryMetadata;
import com.mysema.query.dml.UpdateClause;
import com.mysema.query.jpa.HQLTemplates;
import com.mysema.query.jpa.JPQLSerializer;
import com.mysema.query.jpa.JPQLTemplates;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Expression;
import com.mysema.query.types.ExpressionUtils;
import com.mysema.query.types.NullExpression;
import com.mysema.query.types.Path;
import com.mysema.query.types.Predicate;

/**
 * UpdateClause implementation for Hibernate
 *
 * @author tiwe
 *
 */
public class HibernateUpdateClause implements
        UpdateClause {

    private final QueryMetadata metadata = new DefaultQueryMetadata();

    private final SessionHolder session;

    private final JPQLTemplates templates;

    public HibernateUpdateClause(Session session, EntityPath entity) {
        this(new DefaultSessionHolder(session), entity, HQLTemplates.DEFAULT);
    }

    public HibernateUpdateClause(StatelessSession session, EntityPath entity) {
        this(new StatelessSessionHolder(session), entity, HQLTemplates.DEFAULT);
    }
    
    public HibernateUpdateClause(Session session, EntityPath entity, JPQLTemplates templates) {
        this(new DefaultSessionHolder(session), entity, templates);
    }

    public HibernateUpdateClause(SessionHolder session, EntityPath entity, 
            JPQLTemplates templates) {
        this.session = session;
        this.templates = templates;
        metadata.addJoin(JoinType.DEFAULT, entity);
    }

    @Override
    public long execute() {
        JPQLSerializer serializer = new JPQLSerializer(templates, null);
        serializer.serializeForUpdate(metadata);
        Map constants = serializer.getConstantToLabel();

        Query query = session.createQuery(serializer.toString());
        HibernateUtil.setConstants(query, constants, metadata.getParams());
        return query.executeUpdate();
    }

    @Override
    public  HibernateUpdateClause set(Path path, T value) {
        if (value != null) {
            metadata.addProjection(ExpressionUtils.eqConst(path, value));
        } else {
            setNull(path);
        }
        return this;
    }
    
    @Override
    public  HibernateUpdateClause set(Path path, Expression expression) {
        if (expression != null) {
            metadata.addProjection(ExpressionUtils.eq(path, expression));    
        } else {
            setNull(path);
        }        
        return this;
    }
    
    @Override
    public  HibernateUpdateClause setNull(Path path) {
        metadata.addProjection(ExpressionUtils.eq(path, new NullExpression(path.getType())));
        return this;
    }

    @SuppressWarnings("unchecked")
    @Override
    public HibernateUpdateClause set(List> paths, List values) {
        for (int i = 0; i < paths.size(); i++) {
            if (values.get(i) != null) {
                metadata.addProjection(ExpressionUtils.eqConst((Expression)paths.get(i), values.get(i)));
            } else {
                metadata.addProjection(ExpressionUtils.eq(((Expression)paths.get(i)),
                        new NullExpression(paths.get(i).getType())));
            }

        }
        return this;
    }

    @Override
    public HibernateUpdateClause where(Predicate... o) {
        for (Predicate p : o) {
            metadata.addWhere(p);    
        }        
        return this;
    }
    
    @Override
    public String toString() {
        JPQLSerializer serializer = new JPQLSerializer(templates, null);
        serializer.serializeForUpdate(metadata);
        return serializer.toString();
    }

    @Override
    public boolean isEmpty() {
        return metadata.getProjection().isEmpty();
    }


}