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; 027import org.springframework.lang.Nullable; 028 029/** 030 * A {@link org.springframework.expression.MethodResolver} variant for data binding 031 * purposes, using reflection to access instance methods on a given target object. 032 * 033 * <p>This accessor does not resolve static methods and also no technical methods 034 * on {@code java.lang.Object} or {@code java.lang.Class}. 035 * For unrestricted resolution, choose {@link ReflectiveMethodResolver} instead. 036 * 037 * @author Juergen Hoeller 038 * @since 4.3.15 039 * @see #forInstanceMethodInvocation() 040 * @see DataBindingPropertyAccessor 041 */ 042public final class DataBindingMethodResolver extends ReflectiveMethodResolver { 043 044 private DataBindingMethodResolver() { 045 super(); 046 } 047 048 @Override 049 @Nullable 050 public MethodExecutor resolve(EvaluationContext context, Object targetObject, String name, 051 List<TypeDescriptor> argumentTypes) throws AccessException { 052 053 if (targetObject instanceof Class) { 054 throw new IllegalArgumentException("DataBindingMethodResolver does not support Class targets"); 055 } 056 return super.resolve(context, targetObject, name, argumentTypes); 057 } 058 059 @Override 060 protected boolean isCandidateForInvocation(Method method, Class<?> targetClass) { 061 if (Modifier.isStatic(method.getModifiers())) { 062 return false; 063 } 064 Class<?> clazz = method.getDeclaringClass(); 065 return (clazz != Object.class && clazz != Class.class && !ClassLoader.class.isAssignableFrom(targetClass)); 066 } 067 068 069 /** 070 * Create a new data-binding method resolver for instance method resolution. 071 */ 072 public static DataBindingMethodResolver forInstanceMethodInvocation() { 073 return new DataBindingMethodResolver(); 074 } 075 076}