spring CompilablePropertyAccessor 源码
spring CompilablePropertyAccessor 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/CompilablePropertyAccessor.java
/*
* Copyright 2002-2014 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;
import org.springframework.asm.MethodVisitor;
import org.springframework.asm.Opcodes;
import org.springframework.expression.PropertyAccessor;
/**
* A compilable property accessor is able to generate bytecode that represents
* the access operation, facilitating compilation to bytecode of expressions
* that use the accessor.
*
* @author Andy Clement
* @since 4.1
*/
public interface CompilablePropertyAccessor extends PropertyAccessor, Opcodes {
/**
* Return {@code true} if this property accessor is currently suitable for compilation.
*/
boolean isCompilable();
/**
* Return the type of the accessed property - may only be known once an access has occurred.
*/
Class<?> getPropertyType();
/**
* Generate the bytecode the performs the access operation into the specified MethodVisitor
* using context information from the codeflow where necessary.
* @param propertyName the name of the property
* @param mv the Asm method visitor into which code should be generated
* @param cf the current state of the expression compiler
*/
void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf);
}
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