001/* 002 * Copyright 2002-2016 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; 022 023/** 024 * Expression language AST node that represents an integer literal. 025 * 026 * @author Andy Clement 027 * @since 3.0 028 */ 029public class IntLiteral extends Literal { 030 031 private final TypedValue value; 032 033 034 public IntLiteral(String payload, int pos, int value) { 035 super(payload, pos); 036 this.value = new TypedValue(value); 037 this.exitTypeDescriptor = "I"; 038 } 039 040 041 @Override 042 public TypedValue getLiteralValue() { 043 return this.value; 044 } 045 046 @Override 047 public boolean isCompilable() { 048 return true; 049 } 050 051 @Override 052 public void generateCode(MethodVisitor mv, CodeFlow cf) { 053 int intValue = (Integer) this.value.getValue(); 054 if (intValue == -1) { 055 // Not sure we can get here because -1 is OpMinus 056 mv.visitInsn(ICONST_M1); 057 } 058 else if (intValue >= 0 && intValue < 6) { 059 mv.visitInsn(ICONST_0 + intValue); 060 } 061 else { 062 mv.visitLdcInsn(intValue); 063 } 064 cf.pushDescriptor(this.exitTypeDescriptor); 065 } 066 067}