001/* 002 * Copyright 2002-2019 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 org.springframework.asm.MethodVisitor; 020import org.springframework.expression.TypedValue; 021import org.springframework.expression.spel.CodeFlow; 022import org.springframework.util.Assert; 023 024/** 025 * Expression language AST node that represents an integer literal. 026 * 027 * @author Andy Clement 028 * @since 3.0 029 */ 030public class IntLiteral extends Literal { 031 032 private final TypedValue value; 033 034 035 public IntLiteral(String payload, int startPos, int endPos, int value) { 036 super(payload, startPos, endPos); 037 this.value = new TypedValue(value); 038 this.exitTypeDescriptor = "I"; 039 } 040 041 042 @Override 043 public TypedValue getLiteralValue() { 044 return this.value; 045 } 046 047 @Override 048 public boolean isCompilable() { 049 return true; 050 } 051 052 @Override 053 public void generateCode(MethodVisitor mv, CodeFlow cf) { 054 Integer intValue = (Integer) this.value.getValue(); 055 Assert.state(intValue != null, "No int value"); 056 if (intValue == -1) { 057 // Not sure we can get here because -1 is OpMinus 058 mv.visitInsn(ICONST_M1); 059 } 060 else if (intValue >= 0 && intValue < 6) { 061 mv.visitInsn(ICONST_0 + intValue); 062 } 063 else { 064 mv.visitLdcInsn(intValue); 065 } 066 cf.pushDescriptor(this.exitTypeDescriptor); 067 } 068 069}