CustomImplementationHelper


1   /*
2    * Copyright 2004 Outerthought bvba and Schaubroeck nv
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  package org.outerj.daisy.books.publisher.impl.util;
17  
18  import org.apache.xmlbeans.XmlObject;
19  import org.apache.xmlbeans.XmlCursor;
20  
21  import java.util.Map  ;
22  import java.util.HashMap  ;
23  import java.lang.reflect.Constructor  ;
24  import java.lang.reflect.InvocationTargetException  ;
25  
26  public class CustomImplementationHelper {
27      /**
28       * Instantiates a class trying different constructors: first one taking an xmlObject,
29       * then one taking a Map, and finally the default constructor
30       */
31      public static Object   instantiateComponent(Class   clazz, XmlObject xmlObject) throws IllegalAccessException  , InvocationTargetException  , InstantiationException   {
32          // First try constructor taking an XmlObject as argument
33          Constructor   constructor = null;
34          try {
35              constructor = clazz.getConstructor(new Class  [] { XmlObject.class });
36          } catch (NoSuchMethodException   e) {
37              // ignore
38          }
39          if (constructor != null) {
40              return constructor.newInstance(new Object  [] { xmlObject });
41          }
42  
43          // Then try a constructor which takes a map as argument
44          try {
45              constructor = clazz.getConstructor(new Class  [] { Map  .class });
46          } catch (NoSuchMethodException   e) {
47              // ignore
48          }
49          if (constructor != null) {
50              Map   attributes = getAttributes(xmlObject);
51              return constructor.newInstance(new Object  [] { attributes });
52          }
53  
54          // Finally use the default constructor
55          return clazz.newInstance();
56  
57      }
58  
59      private static Map   getAttributes(XmlObject xmlObject) {
60          Map   attributes = new HashMap  ();
61          XmlCursor cursor = xmlObject.newCursor();
62          cursor.toFirstAttribute();
63          do {
64              attributes.put(cursor.getName().getLocalPart(), cursor.getTextValue());
65          } while (cursor.toNextAttribute());
66          cursor.dispose();
67          return attributes;
68      }
69  }
70
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