%line | %branch | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
org.apache.commons.jelly.tags.bean.BeanPropertyTag |
|
|
1 | /* |
|
2 | * Copyright 2002,2004 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.commons.jelly.tags.bean; |
|
18 | ||
19 | import java.lang.reflect.Method; |
|
20 | import java.lang.reflect.Modifier; |
|
21 | import java.util.Map; |
|
22 | ||
23 | import org.apache.commons.beanutils.MethodUtils; |
|
24 | ||
25 | import org.apache.commons.jelly.JellyTagException; |
|
26 | import org.apache.commons.jelly.XMLOutput; |
|
27 | ||
28 | /** |
|
29 | * Creates a nested property via calling a beans createFoo() method then |
|
30 | * either calling the setFoo(value) or addFoo(value) methods in a similar way |
|
31 | * to how Ant tags construct themselves. |
|
32 | * |
|
33 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
|
34 | * @author Christian Sell |
|
35 | * @version $Revision: 155420 $ |
|
36 | */ |
|
37 | public class BeanPropertyTag extends BeanTag { |
|
38 | ||
39 | /** empty arguments constant */ |
|
40 | 3 | private static final Object[] EMPTY_ARGS = {}; |
41 | ||
42 | /** empty argument types constant */ |
|
43 | 3 | private static final Class[] EMPTY_ARG_TYPES = {}; |
44 | ||
45 | /** the name of the create method */ |
|
46 | private String createMethodName; |
|
47 | ||
48 | ||
49 | public BeanPropertyTag(String tagName) { |
|
50 | 96 | super(Object.class, tagName); |
51 | ||
52 | 90 | if (tagName.length() > 0) { |
53 | 90 | createMethodName = "create" |
54 | + tagName.substring(0,1).toUpperCase() |
|
55 | + tagName.substring(1); |
|
56 | } |
|
57 | 90 | } |
58 | ||
59 | /** |
|
60 | * Creates a new instance by calling a create method on the parent bean |
|
61 | */ |
|
62 | protected Object newInstance(Class theClass, Map attributes, XMLOutput output) throws JellyTagException { |
|
63 | 90 | Object parentObject = getParentObject(); |
64 | 90 | if (parentObject != null) { |
65 | // now lets try call the create method... |
|
66 | 90 | Class parentClass = parentObject.getClass(); |
67 | 90 | Method method = findCreateMethod(parentClass); |
68 | 90 | if (method != null) { |
69 | try { |
|
70 | 45 | return method.invoke(parentObject, EMPTY_ARGS); |
71 | } |
|
72 | 0 | catch (Exception e) { |
73 | 0 | throw new JellyTagException( "failed to invoke method: " + method + " on bean: " + parentObject + " reason: " + e, e ); |
74 | } |
|
75 | } |
|
76 | else { |
|
77 | 45 | Class tagClass = theClass; |
78 | 45 | if(tagClass == Object.class) |
79 | 45 | tagClass = findAddMethodClass(parentClass); |
80 | 45 | if(tagClass == null) |
81 | 0 | throw new JellyTagException("unable to infer element class for tag "+getTagName()); |
82 | ||
83 | 45 | return super.newInstance(tagClass, attributes, output) ; |
84 | } |
|
85 | } |
|
86 | 0 | throw new JellyTagException("The " + getTagName() + " tag must be nested within a tag which maps to a BeanSource implementor"); |
87 | } |
|
88 | ||
89 | /** |
|
90 | * finds the parameter type of the first public method in the parent class whose name |
|
91 | * matches the add{tag name} pattern, whose return type is void and which takes |
|
92 | * one argument only. |
|
93 | * @param parentClass |
|
94 | * @return the class of the first and only parameter |
|
95 | */ |
|
96 | protected Class findAddMethodClass(Class parentClass) { |
|
97 | 45 | Method[] methods = parentClass.getMethods(); |
98 | 90 | for (int i = 0; i < methods.length; i++) { |
99 | 90 | Method method = methods[i]; |
100 | 90 | if(Modclass="keyword">ifier.isPublic(method.getModclass="keyword">ifiers())) { |
101 | 90 | Class[] args = method.getParameterTypes(); |
102 | 90 | if (method.getName().equals(addMethodName) |
103 | && java.lang.Void.TYPE.equals(method.getReturnType()) |
|
104 | && args.length == 1 |
|
105 | && !java.lang.String.class.equals(args[0]) |
|
106 | && !args[0].isArray() |
|
107 | && !args[0].isPrimitive()) |
|
108 | 45 | return args[0]; |
109 | } |
|
110 | } |
|
111 | 0 | return null; |
112 | } |
|
113 | ||
114 | /** |
|
115 | * Finds the Method to create a new property object |
|
116 | */ |
|
117 | protected Method findCreateMethod(Class theClass) { |
|
118 | 90 | if (createMethodName == null) { |
119 | 0 | return null; |
120 | } |
|
121 | 90 | return MethodUtils.getAccessibleMethod( |
122 | theClass, createMethodName, EMPTY_ARG_TYPES |
|
123 | ); |
|
124 | } |
|
125 | } |
This report is generated by jcoverage, Maven and Maven JCoverage Plugin. |