1 package org.apache.commons.ognl;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Map;
23
24 /**
25 * Interface for handling null results from Chains. Object has the opportunity to substitute an object for the null and
26 * continue.
27 *
28 * @author Luke Blanshard (blanshlu@netscape.net)
29 * @author Drew Davidson (drew@ognl.org)
30 */
31 public interface NullHandler
32 {
33 /**
34 * Method called on target returned null.
35 */
36 Object nullMethodResult( Map<String, Object> context, Object target, String methodName, Object[] args );
37
38 /**
39 * Property in target evaluated to null. Property can be a constant String property name or a DynamicSubscript.
40 */
41 Object nullPropertyValue( Map<String, Object> context, Object target, Object property );
42 }