/*
 * 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
/** * 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 true if this property accessor is currently suitable for compilation.
/** * 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.
/** * 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.
Params:
  • propertyName – the name of the property
  • mv – the Asm method visitor into which code should be generated
  • cf – the current state of the expression compiler
/** * 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); }