spring IntLiteral 源码
spring IntLiteral 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/ast/IntLiteral.java
/*
* Copyright 2002-2019 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.Assert;
/**
* Expression language AST node that represents an integer literal.
*
* @author Andy Clement
* @since 3.0
*/
public class IntLiteral extends Literal {
private final TypedValue value;
public IntLiteral(String payload, int startPos, int endPos, int value) {
super(payload, startPos, endPos);
this.value = new TypedValue(value);
this.exitTypeDescriptor = "I";
}
@Override
public TypedValue getLiteralValue() {
return this.value;
}
@Override
public boolean isCompilable() {
return true;
}
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
Integer intValue = (Integer) this.value.getValue();
Assert.state(intValue != null, "No int value");
if (intValue == -1) {
// Not sure we can get here because -1 is OpMinus
mv.visitInsn(ICONST_M1);
}
else if (intValue >= 0 && intValue < 6) {
mv.visitInsn(ICONST_0 + intValue);
}
else {
mv.visitLdcInsn(intValue);
}
cf.pushDescriptor(this.exitTypeDescriptor);
}
}
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