/*
* Copyright 2002-2009 the original author or authors.
*
* Licensed 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.springframework.expression.spel.ast;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.Operation;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
/**
* The power operator.
*
* @author Andy Clement
* @since 3.0
*/
public class OperatorPower extends Operator {
public OperatorPower(int pos, SpelNodeImpl... operands) {
super("^", pos, operands);
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
SpelNodeImpl leftOp = getLeftOperand();
SpelNodeImpl rightOp = getRightOperand();
Object operandOne = leftOp.getValueInternal(state).getValue();
Object operandTwo = rightOp.getValueInternal(state).getValue();
if (operandOne instanceof Number && operandTwo instanceof Number) {
Number op1 = (Number) operandOne;
Number op2 = (Number) operandTwo;
if (op1 instanceof Double || op2 instanceof Double) {
return new TypedValue(Math.pow(op1.doubleValue(),op2.doubleValue()));
} else if (op1 instanceof Long || op2 instanceof Long) {
double d= Math.pow(op1.longValue(), op2.longValue());
return new TypedValue((long)d);
} else {
double d= Math.pow(op1.longValue(), op2.longValue());
if (d > Integer.MAX_VALUE) {
return new TypedValue((long)d);
} else {
return new TypedValue((int)d);
}
}
}
return state.operate(Operation.POWER, operandOne, operandTwo);
}
}
|