1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.view.facelets.util;
20
21 import java.util.ArrayList;
22 import javax.faces.FacesException;
23 import org.apache.myfaces.shared.util.ClassUtils;
24
25 /**
26 * Utility methods used in FaceletsViewDeclarationLanguage
27 *
28 * @author Leonardo Uribe
29 */
30 public class FaceletsViewDeclarationLanguageUtils
31 {
32 public static Class getReturnType(String signature)
33 {
34 int endName = signature.indexOf('(');
35 if (endName < 0)
36 {
37 throw new FacesException("Invalid method signature:" + signature);
38 }
39 int end = signature.lastIndexOf(' ', endName);
40 if (end < 0)
41 {
42 throw new FacesException("Invalid method signature:" + signature);
43 }
44 try
45 {
46 return ClassUtils.javaDefaultTypeToClass(signature.substring(0, end));
47 }
48 catch (ClassNotFoundException e)
49 {
50 throw new FacesException("Invalid method signature:" + signature);
51 }
52 }
53
54 /**
55 * Get the parameters types from the function signature.
56 *
57 * @return An array of parameter class names
58 */
59 public static Class[] getParameters(String signature) throws FacesException
60 {
61 ArrayList<Class> params = new ArrayList<Class>();
62 // Signature is of the form
63 // <return-type> S <method-name S? '('
64 // < <arg-type> ( ',' <arg-type> )* )? ')'
65 int start = signature.indexOf('(') + 1;
66 boolean lastArg = false;
67 while (true)
68 {
69 int p = signature.indexOf(',', start);
70 if (p < 0)
71 {
72 p = signature.indexOf(')', start);
73 if (p < 0)
74 {
75 throw new FacesException("Invalid method signature:" + signature);
76 }
77 lastArg = true;
78 }
79 String arg = signature.substring(start, p).trim();
80 if (!"".equals(arg))
81 {
82 try
83 {
84 params.add(ClassUtils.javaDefaultTypeToClass(arg));
85 }
86 catch (ClassNotFoundException e)
87 {
88 throw new FacesException("Invalid method signature:" + signature);
89 }
90 }
91 if (lastArg)
92 {
93 break;
94 }
95 start = p + 1;
96 }
97 return params.toArray(new Class[params.size()]);
98 }
99
100
101 }