Hibernate example source code file (EntitiesModifiedAtRevisionQuery.java)

This example Hibernate source code file (EntitiesModifiedAtRevisionQuery.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

abstractauditquery, arraylist, auditentitiesconfiguration, auditreaderimplementor, class, entitiesmodifiedatrevisionquery, entitiesmodifiedatrevisionquery, list, list, number, number, query, string, string, util

The Hibernate EntitiesModifiedAtRevisionQuery.java source code

package org.hibernate.envers.query.impl;

import org.hibernate.Query;
import org.hibernate.envers.configuration.AuditConfiguration;
import org.hibernate.envers.configuration.AuditEntitiesConfiguration;
import org.hibernate.envers.query.criteria.AuditCriterion;
import org.hibernate.envers.reader.AuditReaderImplementor;

import java.util.ArrayList;
import java.util.List;

/**
 * In comparison to {@link EntitiesAtRevisionQuery} this query returns an empty collection if an entity
 * of a certain type has not been changed in a given revision.
 * @see EntitiesAtRevisionQuery
 * @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
 */
public class EntitiesModifiedAtRevisionQuery extends AbstractAuditQuery {
    private final Number revision;

    public EntitiesModifiedAtRevisionQuery(AuditConfiguration verCfg, AuditReaderImplementor versionsReader,
                                           Class<?> cls, Number revision) {
        super(verCfg, versionsReader, cls);
        this.revision = revision;
    }

    public EntitiesModifiedAtRevisionQuery(AuditConfiguration verCfg, AuditReaderImplementor versionsReader,
                                           Class<?> cls, String entityName, Number revision) {
        super(verCfg, versionsReader, cls, entityName);
        this.revision = revision;
    }

    @SuppressWarnings({"unchecked"})
    public List list() {
        /*
         * The query that we need to create:
         *   SELECT new list(e) FROM versionsReferencedEntity e
         *   WHERE
         * (all specified conditions, transformed, on the "e" entity) AND
         * e.revision = :revision
         */
        AuditEntitiesConfiguration verEntCfg = verCfg.getAuditEntCfg();
        String revisionPropertyPath = verEntCfg.getRevisionNumberPath();
        qb.getRootParameters().addWhereWithParam(revisionPropertyPath, "=", revision);

        // all specified conditions
        for (AuditCriterion criterion : criterions) {
            criterion.addToQuery(verCfg, entityName, qb, qb.getRootParameters());
        }

        Query query = buildQuery();
        List queryResult = query.list();

        if (hasProjection) {
            return queryResult;
        } else {
            List result = new ArrayList();
            entityInstantiator.addInstancesFromVersionsEntities(entityName, result, queryResult, revision);

            return result;
        }
    }
}