001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.jexl3.internal.introspection; 019import java.util.Map; 020 021/** 022 * Specialized executor to set a property in a Map. 023 * @since 2.0 024 */ 025public final class MapSetExecutor extends AbstractExecutor.Set { 026 /** The java.util.map.put method used as an active marker in MapSet. */ 027 private static final java.lang.reflect.Method MAP_SET = initMarker(Map.class, "put", Object.class, Object.class); 028 /** The property. */ 029 private final Object property; 030 /** The property value class. */ 031 private final Class<?> valueClass; 032 033 /** 034 * Attempts to discover a MapSetExecutor. 035 * 036 * @param is the introspector 037 * @param clazz the class to find the set method from 038 * @param identifier the key to use as an argument to the get method 039 * @param value the value to use as argument in map.put(key,value) 040 * @return the executor if found, null otherwise 041 */ 042 public static MapSetExecutor discover(final Introspector is, 043 final Class<?> clazz, 044 final Object identifier, 045 final Object value) { 046 if (Map.class.isAssignableFrom(clazz)) { 047 return new MapSetExecutor(clazz, MAP_SET, identifier, value); 048 } 049 return null; 050 } 051 052 /** 053 * Creates an instance. 054 * @param clazz the class the set method applies to 055 * @param method the method called through this executor 056 * @param key the key to use as 1st argument to the set method 057 * @param value the value to use as 2nd argument to the set method 058 */ 059 private MapSetExecutor(final Class<?> clazz, final java.lang.reflect.Method method, final Object key, final Object value) { 060 super(clazz, method); 061 property = key; 062 valueClass = classOf(value); 063 } 064 065 @Override 066 public Object getTargetProperty() { 067 return property; 068 } 069 070 @Override 071 public Object invoke(final Object obj, final Object value) { 072 @SuppressWarnings("unchecked") // ctor only allows Map instances - see discover() method 073 final Map<Object,Object> map = ((Map<Object, Object>) obj); 074 map.put(property, value); 075 return value; 076 } 077 078 @Override 079 public Object tryInvoke(final Object obj, final Object key, final Object value) { 080 if (obj != null 081 && method != null 082 && objectClass.equals(obj.getClass()) 083 && ((property == null && key == null) 084 || (property != null && key != null && property.getClass().equals(key.getClass()))) 085 && valueClass.equals(classOf(value))) { 086 @SuppressWarnings("unchecked") // ctor only allows Map instances - see discover() method 087 final Map<Object,Object> map = ((Map<Object, Object>) obj); 088 map.put(key, value); 089 return value; 090 } 091 return TRY_FAILED; 092 } 093}