/*
 * Copyright 2002-2019 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
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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, Giovanni Dall'Oglio Risso
Since:3.0
/** * 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 && rightOperand instanceof Number) { Number leftNumber = (Number) leftOperand; Number rightNumber = (Number) rightOperand; 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); } }