001/* 002 * Copyright 2002-2018 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.support; 018 019import java.lang.reflect.Method; 020import java.lang.reflect.Modifier; 021import java.util.List; 022 023import org.springframework.core.convert.TypeDescriptor; 024import org.springframework.expression.AccessException; 025import org.springframework.expression.EvaluationContext; 026import org.springframework.expression.MethodExecutor; 027 028/** 029 * A {@link org.springframework.expression.MethodResolver} variant for data binding 030 * purposes, using reflection to access instance methods on a given target object. 031 * 032 * <p>This accessor does not resolve static methods and also no technical methods 033 * on {@code java.lang.Object} or {@code java.lang.Class}. 034 * For unrestricted resolution, choose {@link ReflectiveMethodResolver} instead. 035 * 036 * @author Juergen Hoeller 037 * @since 4.3.15 038 * @see #forInstanceMethodInvocation() 039 * @see DataBindingPropertyAccessor 040 */ 041public class DataBindingMethodResolver extends ReflectiveMethodResolver { 042 043 private DataBindingMethodResolver() { 044 super(); 045 } 046 047 @Override 048 public MethodExecutor resolve(EvaluationContext context, Object targetObject, String name, 049 List<TypeDescriptor> argumentTypes) throws AccessException { 050 051 if (targetObject instanceof Class) { 052 throw new IllegalArgumentException("DataBindingMethodResolver does not support Class targets"); 053 } 054 return super.resolve(context, targetObject, name, argumentTypes); 055 } 056 057 @Override 058 protected boolean isCandidateForInvocation(Method method, Class<?> targetClass) { 059 if (Modifier.isStatic(method.getModifiers())) { 060 return false; 061 } 062 Class<?> clazz = method.getDeclaringClass(); 063 return (clazz != Object.class && clazz != Class.class && !ClassLoader.class.isAssignableFrom(targetClass)); 064 } 065 066 067 /** 068 * Create a new data-binding method resolver for instance method resolution. 069 */ 070 public static DataBindingMethodResolver forInstanceMethodInvocation() { 071 return new DataBindingMethodResolver(); 072 } 073 074}