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Java > Open Source Codes > com > google > gwt > lang > Exceptions


1 /*
2  * Copyright 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * 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, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.lang;
17
18 import com.google.gwt.core.client.JavaScriptException;
19
20 /**
21  * This is a magic class the compiler uses to throw and check exceptions.
22  */
23 final class Exceptions {
24
25   static Object JavaDoc caught(Object JavaDoc e) {
26     if (e instanceof Throwable JavaDoc) {
27       return e;
28     }
29     return new JavaScriptException(javaScriptExceptionName(e),
30         javaScriptExceptionDescription(e));
31   }
32
33   /**
34    * Returns the description of an unexpected JavaScript exception (not a normal
35    * Java one).
36    */
37   private static native String JavaDoc javaScriptExceptionDescription(Object JavaDoc e) /*-{
38     return e.message;
39   }-*/;
40
41   /**
42    * Returns the name of an unexpected JavaScript exception (not a normal Java
43    * one).
44    */
45   private static native String JavaDoc javaScriptExceptionName(Object JavaDoc e) /*-{
46     return e.name;
47   }-*/;
48
49 }
50
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