Package org.hibernate.criterion

Source Code of org.hibernate.criterion.AbstractEmptinessExpression

// $Id: AbstractEmptinessExpression.java 6670 2005-05-03 22:19:00Z steveebersole $
package org.hibernate.criterion;

import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.QueryException;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.TypedValue;
import org.hibernate.persister.collection.QueryableCollection;
import org.hibernate.persister.entity.Loadable;
import org.hibernate.persister.entity.PropertyMapping;
import org.hibernate.sql.ConditionFragment;
import org.hibernate.type.CollectionType;
import org.hibernate.type.Type;

/**
* Implementation of AbstractEmptinessExpression.
*
* @author Steve Ebersole
*/
public abstract class AbstractEmptinessExpression implements Criterion {

  private static final TypedValue[] NO_VALUES = new TypedValue[0];

  protected final String propertyName;

  protected AbstractEmptinessExpression(String propertyName) {
    this.propertyName = propertyName;
  }

  protected abstract boolean excludeEmpty();

  public final String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery) throws HibernateException {
    String entityName = criteriaQuery.getEntityName( criteria, propertyName );
    String actualPropertyName = criteriaQuery.getPropertyName( propertyName );
    String sqlAlias = criteriaQuery.getSQLAlias( criteria, propertyName );

    SessionFactoryImplementor factory = criteriaQuery.getFactory();
    QueryableCollection collectionPersister = getQueryableCollection( entityName, actualPropertyName, factory );

    String[] collectionKeys = collectionPersister.getKeyColumnNames();
    String[] ownerKeys = ( ( Loadable ) factory.getEntityPersister( entityName ) ).getIdentifierColumnNames();

    String innerSelect = "(select 1 from " + collectionPersister.getTableName()
            + " where "
            + new ConditionFragment().setTableAlias( sqlAlias ).setCondition( ownerKeys, collectionKeys ).toFragmentString()
            + ")";

    return excludeEmpty()
            ? "exists " + innerSelect
            : "not exists " + innerSelect;
  }


  protected QueryableCollection getQueryableCollection(String entityName, String propertyName, SessionFactoryImplementor factory)
          throws HibernateException {
    PropertyMapping ownerMapping = ( PropertyMapping ) factory.getEntityPersister( entityName );
    Type type = ownerMapping.toType( propertyName );
    if ( !type.isCollectionType() ) {
      throw new MappingException(
              "Property path [" + entityName + "." + propertyName + "] does not reference a collection"
      );
    }

    String role = ( ( CollectionType ) type ).getRole();
    try {
      return ( QueryableCollection ) factory.getCollectionPersister( role );
    }
    catch ( ClassCastException cce ) {
      throw new QueryException( "collection role is not queryable: " + role );
    }
    catch ( Exception e ) {
      throw new QueryException( "collection role not found: " + role );
    }
  }

  public final TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery)
          throws HibernateException {
    return NO_VALUES;
  }

  public final String toString() {
    return propertyName + ( excludeEmpty() ? " is not empty" : " is empty" );
  }
}
TOP

Related Classes of org.hibernate.criterion.AbstractEmptinessExpression

TOP
Copyright © 2018 www.massapi.com. All rights reserved.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.