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Java > Open Source Codes > org > apache > taglibs > standard > examples > util > Util


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
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
17 package org.apache.taglibs.standard.examples.util;
18
19 import java.io.*;
20 import javax.servlet.jsp.*;
21
22 /**
23  * <p>Utility class for examples webapp.
24  *
25  * @author Pierre Delisle
26  * @version $Revision: 1.3 $ $Date: 2004/02/28 01:01:41 $
27  */

28 public class Util {
29
30     public static Writer castToWriter(Object JavaDoc obj) throws JspException {
31         if (obj instanceof OutputStream) {
32             return new OutputStreamWriter((OutputStream)obj);
33         } else if (obj instanceof Writer) {
34             return (Writer)obj;
35             /*@@@
36         } else if (obj instanceof String) {
37             return new StringWriter();
38              */

39         }
40         throw new JspException("Invalid type '" + obj.getClass().getName() +
41                    "' for castToWriter()");
42     }
43     
44     public static Reader castToReader(Object JavaDoc obj) throws JspException {
45         if (obj instanceof InputStream) {
46             return new InputStreamReader((InputStream)obj);
47         } else if (obj instanceof Reader) {
48             return (Reader)obj;
49         } else if (obj instanceof String JavaDoc) {
50             return new StringReader((String JavaDoc)obj);
51         }
52         throw new JspException("Invalid type '" + obj.getClass().getName() +
53                    "' for castToReader()");
54     }
55 }
56
57
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