001/* 002 * Copyright 2002-2014 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.expression.spel.ast; 018 019import java.math.BigDecimal; 020import java.math.BigInteger; 021 022import org.springframework.asm.MethodVisitor; 023import org.springframework.expression.EvaluationException; 024import org.springframework.expression.spel.CodeFlow; 025import org.springframework.expression.spel.ExpressionState; 026import org.springframework.expression.spel.support.BooleanTypedValue; 027import org.springframework.util.NumberUtils; 028 029/** 030 * Implements the less-than-or-equal operator. 031 * 032 * @author Andy Clement 033 * @author Juergen Hoeller 034 * @author Giovanni Dall'Oglio Risso 035 * @since 3.0 036 */ 037public class OpLE extends Operator { 038 039 public OpLE(int pos, SpelNodeImpl... operands) { 040 super("<=", pos, operands); 041 this.exitTypeDescriptor = "Z"; 042 } 043 044 045 @Override 046 public BooleanTypedValue getValueInternal(ExpressionState state) throws EvaluationException { 047 Object left = getLeftOperand().getValueInternal(state).getValue(); 048 Object right = getRightOperand().getValueInternal(state).getValue(); 049 050 this.leftActualDescriptor = CodeFlow.toDescriptorFromObject(left); 051 this.rightActualDescriptor = CodeFlow.toDescriptorFromObject(right); 052 053 if (left instanceof Number && right instanceof Number) { 054 Number leftNumber = (Number) left; 055 Number rightNumber = (Number) right; 056 057 if (leftNumber instanceof BigDecimal || rightNumber instanceof BigDecimal) { 058 BigDecimal leftBigDecimal = NumberUtils.convertNumberToTargetClass(leftNumber, BigDecimal.class); 059 BigDecimal rightBigDecimal = NumberUtils.convertNumberToTargetClass(rightNumber, BigDecimal.class); 060 return BooleanTypedValue.forValue(leftBigDecimal.compareTo(rightBigDecimal) <= 0); 061 } 062 else if (leftNumber instanceof Double || rightNumber instanceof Double) { 063 return BooleanTypedValue.forValue(leftNumber.doubleValue() <= rightNumber.doubleValue()); 064 } 065 else if (leftNumber instanceof Float || rightNumber instanceof Float) { 066 return BooleanTypedValue.forValue(leftNumber.floatValue() <= rightNumber.floatValue()); 067 } 068 else if (leftNumber instanceof BigInteger || rightNumber instanceof BigInteger) { 069 BigInteger leftBigInteger = NumberUtils.convertNumberToTargetClass(leftNumber, BigInteger.class); 070 BigInteger rightBigInteger = NumberUtils.convertNumberToTargetClass(rightNumber, BigInteger.class); 071 return BooleanTypedValue.forValue(leftBigInteger.compareTo(rightBigInteger) <= 0); 072 } 073 else if (leftNumber instanceof Long || rightNumber instanceof Long) { 074 return BooleanTypedValue.forValue(leftNumber.longValue() <= rightNumber.longValue()); 075 } 076 else if (leftNumber instanceof Integer || rightNumber instanceof Integer) { 077 return BooleanTypedValue.forValue(leftNumber.intValue() <= rightNumber.intValue()); 078 } 079 else if (leftNumber instanceof Short || rightNumber instanceof Short) { 080 return BooleanTypedValue.forValue(leftNumber.shortValue() <= rightNumber.shortValue()); 081 } 082 else if (leftNumber instanceof Byte || rightNumber instanceof Byte) { 083 return BooleanTypedValue.forValue(leftNumber.byteValue() <= rightNumber.byteValue()); 084 } 085 else { 086 // Unknown Number subtypes -> best guess is double comparison 087 return BooleanTypedValue.forValue(leftNumber.doubleValue() <= rightNumber.doubleValue()); 088 } 089 } 090 091 return BooleanTypedValue.forValue(state.getTypeComparator().compare(left, right) <= 0); 092 } 093 094 @Override 095 public boolean isCompilable() { 096 return isCompilableOperatorUsingNumerics(); 097 } 098 099 @Override 100 public void generateCode(MethodVisitor mv, CodeFlow cf) { 101 generateComparisonCode(mv, cf, IFGT, IF_ICMPGT); 102 } 103 104}