spring OperatorPower 源码
spring OperatorPower 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/ast/OperatorPower.java
/*
* Copyright 2002-2021 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
*
* https://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 java.math.BigDecimal;
import java.math.BigInteger;
import org.springframework.expression.EvaluationException;
import org.springframework.expression.Operation;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.ExpressionState;
import org.springframework.util.NumberUtils;
/**
* The power operator.
*
* @author Andy Clement
* @author Giovanni Dall'Oglio Risso
* @since 3.0
*/
public class OperatorPower extends Operator {
public OperatorPower(int startPos, int endPos, SpelNodeImpl... operands) {
super("^", startPos, endPos, operands);
}
@Override
public TypedValue getValueInternal(ExpressionState state) throws EvaluationException {
SpelNodeImpl leftOp = getLeftOperand();
SpelNodeImpl rightOp = getRightOperand();
Object leftOperand = leftOp.getValueInternal(state).getValue();
Object rightOperand = rightOp.getValueInternal(state).getValue();
if (leftOperand instanceof Number leftNumber && rightOperand instanceof Number rightNumber) {
if (leftNumber instanceof BigDecimal) {
BigDecimal leftBigDecimal = NumberUtils.convertNumberToTargetClass(leftNumber, BigDecimal.class);
return new TypedValue(leftBigDecimal.pow(rightNumber.intValue()));
}
else if (leftNumber instanceof BigInteger) {
BigInteger leftBigInteger = NumberUtils.convertNumberToTargetClass(leftNumber, BigInteger.class);
return new TypedValue(leftBigInteger.pow(rightNumber.intValue()));
}
else if (leftNumber instanceof Double || rightNumber instanceof Double) {
return new TypedValue(Math.pow(leftNumber.doubleValue(), rightNumber.doubleValue()));
}
else if (leftNumber instanceof Float || rightNumber instanceof Float) {
return new TypedValue(Math.pow(leftNumber.floatValue(), rightNumber.floatValue()));
}
double d = Math.pow(leftNumber.doubleValue(), rightNumber.doubleValue());
if (d > Integer.MAX_VALUE || leftNumber instanceof Long || rightNumber instanceof Long) {
return new TypedValue((long) d);
}
else {
return new TypedValue((int) d);
}
}
return state.operate(Operation.POWER, leftOperand, rightOperand);
}
}
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