| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 |
| * |
| * http://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.apache.commons.jexl2.internal; |
| import java.util.List; |
| import java.lang.reflect.Array; |
| /** |
| * Specialized executor to set a property in a List or array. |
| * @since 2.0 |
| */ |
| public final class ListSetExecutor extends AbstractExecutor.Set { |
| /** The java.lang.reflect.Array.get method used as an active marker in ListGet. */ |
| private static final java.lang.reflect.Method ARRAY_SET = |
| initMarker(Array.class, "set", Object.class, Integer.TYPE, Object.class); |
| /** The java.util.obj.set method used as an active marker in ListSet. */ |
| private static final java.lang.reflect.Method LIST_SET = |
| initMarker(List.class, "set", Integer.TYPE, Object.class); |
| /** The property. */ |
| private final Integer property; |
| |
| /** |
| * Creates an instance checking for the List interface or Array capability. |
| * @param is the introspector |
| * @param clazz the class that might implement the map interface |
| * @param key the key to use in obj.set(key,value) |
| * @param value the value to use in obj.set(key,value) |
| */ |
| public ListSetExecutor(Introspector is, Class<?> clazz, Integer key, Object value) { |
| super(clazz, discover(clazz)); |
| property = key; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Object getTargetProperty() { |
| return property; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Object execute(final Object obj, Object value) { |
| if (method == ARRAY_SET) { |
| java.lang.reflect.Array.set(obj, property.intValue(), value); |
| } else { |
| @SuppressWarnings("unchecked") // LSE should only be created for array or list types |
| final List<Object> list = (List<Object>) obj; |
| list.set(property.intValue(), value); |
| } |
| return value; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Object tryExecute(final Object obj, Object key, Object value) { |
| if (obj != null && method != null |
| && objectClass.equals(obj.getClass()) |
| && key instanceof Integer) { |
| if (method == ARRAY_SET) { |
| Array.set(obj, ((Integer) key).intValue(), value); |
| } else { |
| @SuppressWarnings("unchecked") // LSE should only be created for array or list types |
| final List<Object> list = (List<Object>) obj; |
| list.set(((Integer) key).intValue(), value); |
| } |
| return value; |
| } |
| return TRY_FAILED; |
| } |
| |
| |
| /** |
| * Finds the method to perform 'set' on a obj of array. |
| * @param clazz the class to introspect |
| * @return a marker method, obj.set or array.set |
| */ |
| static java.lang.reflect.Method discover(Class<?> clazz) { |
| if (clazz.isArray()) { |
| // we could verify if the call can be performed but it does not change |
| // the fact we would fail... |
| // Class<?> formal = clazz.getComponentType(); |
| // Class<?> actual = value == null? Object.class : value.getClass(); |
| // if (IntrospectionUtils.isMethodInvocationConvertible(formal, actual, false)) { |
| return ARRAY_SET; |
| // } |
| } |
| if (List.class.isAssignableFrom(clazz)) { |
| return LIST_SET; |
| } |
| return null; |
| } |
| } |