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.StringUtils; 023 024/** 025 * Expression language AST node that represents a string literal. 026 * 027 * @author Andy Clement 028 * @author Juergen Hoeller 029 * @since 3.0 030 */ 031public class StringLiteral extends Literal { 032 033 private final TypedValue value; 034 035 036 public StringLiteral(String payload, int startPos, int endPos, String value) { 037 super(payload, startPos, endPos); 038 039 String valueWithinQuotes = value.substring(1, value.length() - 1); 040 valueWithinQuotes = StringUtils.replace(valueWithinQuotes, "''", "'"); 041 valueWithinQuotes = StringUtils.replace(valueWithinQuotes, "\"\"", "\""); 042 043 this.value = new TypedValue(valueWithinQuotes); 044 this.exitTypeDescriptor = "Ljava/lang/String"; 045 } 046 047 048 @Override 049 public TypedValue getLiteralValue() { 050 return this.value; 051 } 052 053 @Override 054 public String toString() { 055 return "'" + getLiteralValue().getValue() + "'"; 056 } 057 058 @Override 059 public boolean isCompilable() { 060 return true; 061 } 062 063 @Override 064 public void generateCode(MethodVisitor mv, CodeFlow cf) { 065 mv.visitLdcInsn(this.value.getValue()); 066 cf.pushDescriptor(this.exitTypeDescriptor); 067 } 068 069}