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

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/*
 * Copyright (c) 2010 Mysema Ltd.
 * All rights reserved.
 *
 */
package com.mysema.query.jpa.hibernate;

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.DeleteClause;
import com.mysema.query.jpa.JPQLSerializer;
import com.mysema.query.jpa.HQLTemplates;
import com.mysema.query.jpa.JPQLTemplates;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Predicate;

/**
 * DeleteClause implementation for Hibernate
 *
 * @author tiwe
 *
 */
public class HibernateDeleteClause implements DeleteClause{

    private final QueryMetadata md = new DefaultQueryMetadata();

    private final SessionHolder session;

    private final JPQLTemplates templates;

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

    public HibernateDeleteClause(StatelessSession session, EntityPath entity){
        this(new StatelessSessionHolder(session), entity, HQLTemplates.DEFAULT);
    }

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

    @Override
    public long execute() {
        JPQLSerializer serializer = new JPQLSerializer(templates);
        serializer.serializeForDelete(md);
        Map constants = serializer.getConstantToLabel();

        Query query = session.createQuery(serializer.toString());
        HibernateUtil.setConstants(query, constants, md.getParams());
        return query.executeUpdate();
    }
    
    @Override
    public HibernateDeleteClause where(Predicate... o) {
        md.addWhere(o);
        return this;
    }
    
    @Override
    public String toString(){
        JPQLSerializer serializer = new JPQLSerializer(templates);
        serializer.serializeForDelete(md);
        return serializer.toString();
    }

}