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Java > Open Source Codes > org > springframework > webflow > engine > FlowExecutionExceptionHandler


1 /*
2  * Copyright 2002-2006 the original author or authors.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.springframework.webflow.engine;
17
18 import org.springframework.webflow.execution.FlowExecutionException;
19 import org.springframework.webflow.execution.ViewSelection;
20
21 /**
22  * A strategy for handling an exception that occurs at runtime during the
23  * execution of a flow definition.
24  *
25  * @author Keith Donald
26  */
27 public interface FlowExecutionExceptionHandler {
28
29     /**
30      * Can this handler handle the given exception?
31      * @param exception the exception that occured
32      * @return true if yes, false if no
33      */
34     public boolean handles(FlowExecutionException exception);
35
36     /**
37      * Handle the exception in the context of the current request, optionally
38      * making an error view selection that should be rendered.
39      * @param exception the exception that occured
40      * @param context the execution control context for this request
41      * @return the selected error view that should be displayed (may be null if
42      * the handler chooses not to select a view, in which case other exception
43      * handlers may be given a chance to handle the exception)
44      */
45     public ViewSelection handle(FlowExecutionException exception, RequestControlContext context);
46 }
47
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