/* * 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 * 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.asm.MethodVisitor;import org.springframework.expression.EvaluationException;import org.springframework.expression.Operation;import org.springframework.expression.TypedValue;import org.springframework.expression.spel.CodeFlow;import org.springframework.expression.spel.ExpressionState;import org.springframework.util.Assert;import org.springframework.util.NumberUtils;/** * The minus operator supports: * <ul> * <li>subtraction of numbers * <li>subtraction of an int from a string of one character * (effectively decreasing that character), so 'd'-3='a' * </ul> * * <p>It can be used as a unary operator for numbers. * The standard promotions are performed when the operand types vary (double-int=double). * For other options it defers to the registered overloader. * * @author Andy Clement * @author Juergen Hoeller * @author Giovanni Dall'Oglio Risso * @since 3.0 */public class OpMinus extends Operator { public OpMinus(int startPos, int endPos, SpelNodeImpl... operands) { super("-", startPos, endPos, operands); } @Override public TypedValue getValueInternal(ExpressionState state) throws EvaluationException { SpelNodeImpl leftOp = getLeftOperand(); if (this.children.length < 2) { // if only one operand, then this is unary minus Object operand = leftOp.getValueInternal(state).getValue(); if (operand instanceof Number) { if (operand instanceof BigDecimal) { return new TypedValue(((BigDecimal) operand).negate()); } else if (operand instanceof Double) { this.exitTypeDescriptor = "D"; return new TypedValue(0 - ((Number) operand).doubleValue()); } else if (operand instanceof Float) { this.exitTypeDescriptor = "F"; return new TypedValue(0 - ((Number) operand).floatValue()); }