/*
* 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 org.apache.openjpa.kernel.Filters;
import org.apache.openjpa.kernel.StoreContext;
/**
* Value produced by a mathematical operation on two values.
*
* @author Abe White
*/
abstract class MathVal
extends Val {
private final Val _val1;
private final Val _val2;
/**
* Constructor. Provide the values to operate on.
*/
public MathVal(Val val1, Val val2) {
_val1 = val1;
_val2 = val2;
}
public Class getType() {
Class c1 = _val1.getType();
Class c2 = _val2.getType();
return Filters.promote(c1, c2);
}
public void setImplicitType(Class type) {
}
protected Object eval(Object candidate, Object orig,
StoreContext ctx, Object[] params) {
Object o1 = _val1.eval(candidate, orig, ctx, params);
Object o2 = _val2.eval(candidate, orig, ctx, params);
return operate(o1, _val1.getType(), o2, _val2.getType());
}
/**
* Return the result of this mathematical operation on the two values.
*/
protected abstract Object operate(Object o1, Class c1, Object o2,
Class c2);
public void acceptVisit(ExpressionVisitor visitor) {
visitor.enter(this);
_val1.acceptVisit(visitor);
_val2.acceptVisit(visitor);
visitor.exit(this);
}
}