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.spel.CodeFlow; 021import org.springframework.expression.spel.support.BooleanTypedValue; 022 023/** 024 * Represents the literal values {@code TRUE} and {@code FALSE}. 025 * 026 * @author Andy Clement 027 * @since 3.0 028 */ 029public class BooleanLiteral extends Literal { 030 031 private final BooleanTypedValue value; 032 033 034 public BooleanLiteral(String payload, int pos, boolean value) { 035 super(payload, pos); 036 this.value = BooleanTypedValue.forValue(value); 037 this.exitTypeDescriptor = "Z"; 038 } 039 040 041 @Override 042 public BooleanTypedValue 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 if (this.value == BooleanTypedValue.TRUE) { 054 mv.visitLdcInsn(1); 055 } 056 else { 057 mv.visitLdcInsn(0); 058 } 059 cf.pushDescriptor(this.exitTypeDescriptor); 060 } 061 062}