/
StringLiteral.java
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/
StringLiteral.java
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/*
* Copyright 2002-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.expression.spel.ast;
import org.springframework.asm.MethodVisitor;
import org.springframework.expression.TypedValue;
import org.springframework.expression.spel.CodeFlow;
import org.springframework.util.StringUtils;
/**
* Expression language AST node that represents a string literal.
*
* @author Andy Clement
* @author Juergen Hoeller
* @author Sam Brannen
* @since 3.0
*/
public class StringLiteral extends Literal {
private final TypedValue value;
public StringLiteral(String payload, int startPos, int endPos, String value) {
super(payload, startPos, endPos);
// The original enclosing quote character for the string literal: ' or ".
char quoteCharacter = value.charAt(0);
// Remove enclosing quotes
String valueWithinQuotes = value.substring(1, value.length() - 1);
// Replace escaped internal quote characters
if (quoteCharacter == '\'') {
valueWithinQuotes = StringUtils.replace(valueWithinQuotes, "''", "'");
}
else {
valueWithinQuotes = StringUtils.replace(valueWithinQuotes, "\"\"", "\"");
}
this.value = new TypedValue(valueWithinQuotes);
this.exitTypeDescriptor = "Ljava/lang/String";
}
@Override
public TypedValue getLiteralValue() {
return this.value;
}
@Override
public String toString() {
String ast = String.valueOf(getLiteralValue().getValue());
ast = StringUtils.replace(ast, "'", "''");
return "'" + ast + "'";
}
@Override
public boolean isCompilable() {
return true;
}
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
mv.visitLdcInsn(this.value.getValue());
cf.pushDescriptor(this.exitTypeDescriptor);
}
}