|
1
22 package org.jboss.xb.binding;
23
24 import java.lang.reflect.Method  ;
25 import org.jboss.logging.Logger;
26
27
33 public class DelegatingObjectModelProvider
34 implements GenericObjectModelProvider
35 {
36 private static final Logger log = Logger.getLogger(DelegatingObjectModelProvider.class);
37
38 private final ObjectModelProvider provider;
39 private final boolean trace = log.isTraceEnabled();
40
41 public DelegatingObjectModelProvider(ObjectModelProvider provider)
42 {
43 this.provider = provider;
44 }
45
46 public Object getChildren(Object o, MarshallingContext ctx, String namespaceURI, String localName)
47 {
48 return provideChildren(provider, o, namespaceURI, localName);
49 }
50
51 public Object getElementValue(Object o, MarshallingContext ctx, String namespaceURI, String localName)
52 {
53 return provideValue(provider, o, namespaceURI, localName);
54 }
55
56 public Object getAttributeValue(Object o, MarshallingContext ctx, String namespaceURI, String localName)
57 {
58 return provideAttributeValue(provider, o, namespaceURI, localName);
59 }
60
61 public Object getRoot(Object o, MarshallingContext ctx, String namespaceURI, String localName)
62 {
63 return provider.getRoot(o, null, namespaceURI, localName);
64 }
65
66
68 Object provideChildren(ObjectModelProvider provider,
69 Object parent,
70 String namespaceUri,
71 String name)
72 {
73 Class providerClass = provider.getClass();
74 Class parentClass = parent.getClass();
75 String methodName = "getChildren";
76
77 Object container = null;
78 Method method = getProviderMethod(providerClass,
79 methodName,
80 new Class []{parentClass, String .class, String .class}
81 );
82 if(method != null)
83 {
84 try
85 {
86 container = method.invoke(provider, new Object []{parent, namespaceUri, name});
87 }
88 catch(Exception e)
89 {
90 log.error("Failed to invoke method " + methodName, e);
91 throw new IllegalStateException ("Failed to invoke method " + methodName);
92 }
93 }
94 else if(trace)
95 {
96 log.trace("No " + methodName + " for " + name);
97 }
98 return container;
99 }
100
101 Object provideValue(ObjectModelProvider provider,
102 Object parent,
103 String namespaceUri,
104 String name)
105 {
106 Class providerClass = provider.getClass();
107 Class parentClass = parent.getClass();
108 String methodName = "getElementValue";
109
110 Object value = null;
111 Method method = getProviderMethod(providerClass,
112 methodName,
113 new Class []{parentClass, String .class, String .class}
114 );
115 if(method != null)
116 {
117 try
118 {
119 value = method.invoke(provider, new Object []{parent, namespaceUri, name});
120 }
121 catch(Exception e)
122 {
123 throw new IllegalStateException ("Failed to invoke method " + methodName);
124 }
125 }
126 else if(trace)
127 {
128 log.trace("No " + methodName + " for " + name);
129 }
130 return value;
131 }
132
133 Object provideAttributeValue(ObjectModelProvider provider,
134 Object object,
135 String namespaceUri,
136 String name)
137 {
138 Class providerClass = provider.getClass();
139 Class objectClass = object.getClass();
140 String methodName = "getAttributeValue";
141
142 Object value = null;
143 Method method = getProviderMethod(providerClass,
144 methodName,
145 new Class []{objectClass, String .class, String .class}
146 );
147 if(method != null)
148 {
149 try
150 {
151 value = method.invoke(provider, new Object []{object, namespaceUri, name});
152 }
153 catch(Exception e)
154 {
155 throw new IllegalStateException ("Failed to invoke method " + methodName);
156 }
157 }
158 else if(trace)
159 {
160 log.trace("No " + methodName + " for " + name);
161 }
162 return value;
163 }
164
165 private static Method getProviderMethod(Class providerClass, String methodName, Class [] args)
166 {
167 Method method = null;
168 try
169 {
170 method = providerClass.getMethod(methodName, args);
171 }
172 catch(NoSuchMethodException e)
173 {
174 }
176 return method;
177 }
178 }
179 |
Popular Tags |
Java API By Example, From Geeks To Geeks.