/*
* 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.kernel.exps;
import java.util.Collection;
import java.util.Map;
/**
* {@link BindVariableExpression} for map key sets.
*
* @author Abe White
*/
class BindKeyVariableExpression
extends BindVariableExpression {
/**
* Constructor.
*
* @param var the bound variable
* @param val the value the variable is bound to
*/
public BindKeyVariableExpression(BoundVariable var, Val val) {
super(var, val);
}
protected Collection getCollection(Object values) {
Map map = (Map) values;
return (map == null) ? null : map.keySet();
}
}