//$Id: SubqueryExpression.java 7365 2005-07-04 02:40:29Z oneovthafew $
package org.hibernate.criterion;
import org.hibernate.Criteria;
import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.QueryParameters;
import org.hibernate.engine.SessionFactoryImplementor;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.TypedValue;
import org.hibernate.impl.CriteriaImpl;
import org.hibernate.loader.criteria.CriteriaQueryTranslator;
import org.hibernate.persister.entity.OuterJoinLoadable;
import org.hibernate.sql.Select;
import org.hibernate.type.Type;
/**
* @author Gavin King
*/
public abstract class SubqueryExpression implements Criterion {
private CriteriaImpl criteriaImpl;
private String quantifier;
private String op;
private QueryParameters params;
private Type[] types;
protected Type[] getTypes() {
return types;
}
protected SubqueryExpression(String op, String quantifier, DetachedCriteria dc) {
this.criteriaImpl = dc.getCriteriaImpl();
this.quantifier = quantifier;
this.op = op;
}
protected abstract String toLeftSqlString(Criteria criteria, CriteriaQuery outerQuery);
public String toSqlString(Criteria criteria, CriteriaQuery criteriaQuery)
throws HibernateException {
final SessionImplementor session = ( (CriteriaImpl) criteria ).getSession(); //ugly!
final SessionFactoryImplementor factory = session.getFactory();
final OuterJoinLoadable persister = (OuterJoinLoadable) factory.getEntityPersister( criteriaImpl.getEntityOrClassName() );
CriteriaQueryTranslator innerQuery = new CriteriaQueryTranslator(
factory,
criteriaImpl,
criteriaImpl.getEntityOrClassName(), //implicit polymorphism not supported (would need a union)
criteriaQuery.generateSQLAlias(),
criteriaQuery
);
params = innerQuery.getQueryParameters(); //TODO: bad lifecycle....
types = innerQuery.getProjectedTypes();
//String filter = persister.filterFragment( innerQuery.getRootSQLALias(), session.getEnabledFilters() );
String sql = new Select( factory.getDialect() )
.setWhereClause( innerQuery.getWhereCondition() )
.setGroupByClause( innerQuery.getGroupBy() )
.setSelectClause( innerQuery.getSelect() )
.setFromClause(
persister.fromTableFragment( innerQuery.getRootSQLALias() ) +
persister.fromJoinFragment( innerQuery.getRootSQLALias(), true, false )
)
.toStatementString();
final StringBuffer buf = new StringBuffer()
.append( toLeftSqlString(criteria, criteriaQuery) );
if (op!=null) buf.append(' ').append(op).append(' ');
if (quantifier!=null) buf.append(quantifier).append(' ');
return buf.append('(').append(sql).append(')')
.toString();
}
public TypedValue[] getTypedValues(Criteria criteria, CriteriaQuery criteriaQuery)
throws HibernateException {
Type[] types = params.getPositionalParameterTypes();
Object[] values = params.getPositionalParameterValues();
TypedValue[] tv = new TypedValue[types.length];
for ( int i=0; i<types.length; i++ ) {
tv[i] = new TypedValue( types[i], values[i], EntityMode.POJO );
}
return tv;
}
}