org.apache.openjpa.jdbc.meta.JDBCValueOrder Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.openjpa.jdbc.meta;
import java.util.Comparator;
import org.apache.openjpa.jdbc.identifier.DBIdentifier;
import org.apache.openjpa.jdbc.sql.Joins;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.meta.Order;
/**
* Order by value columns, which are the primary key columns in the case
* of a relation field.
*
* @author Abe White
*/
@SuppressWarnings("serial")
class JDBCValueOrder
implements JDBCOrder {
private final FieldMapping _fm;
private final boolean _asc;
private static final DBIdentifier SQL_ELEMENT = DBIdentifier.newColumn(Order.ELEMENT);
public JDBCValueOrder(FieldMapping fm, boolean asc) {
_fm = fm;
_asc = asc;
}
public String getName() {
return Order.ELEMENT;
}
public DBIdentifier getIdentifier() {
return SQL_ELEMENT;
}
public boolean isAscending() {
return _asc;
}
public Comparator getComparator() {
return null;
}
public boolean isInRelation() {
return _fm.getElement().getTypeMetaData() != null;
}
public void order(Select sel, ClassMapping elem, Joins joins) {
if (elem != null)
sel.orderBy(elem.getPrimaryKeyColumns(), _asc, joins, false);
else
sel.orderBy(_fm.getElementMapping().getColumns(), _asc,
joins, false);
}
}