DataObjectDescriptorFactory


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19  package org.apache.cayenne.reflect.generic;
20  
21  import org.apache.cayenne.DataObject;
22  import org.apache.cayenne.map.ObjAttribute;
23  import org.apache.cayenne.map.ObjEntity;
24  import org.apache.cayenne.map.ObjRelationship;
25  import org.apache.cayenne.reflect.Accessor;
26  import org.apache.cayenne.reflect.ClassDescriptor;
27  import org.apache.cayenne.reflect.ClassDescriptorFactory;
28  import org.apache.cayenne.reflect.ClassDescriptorMap;
29  import org.apache.cayenne.reflect.PersistentDescriptor;
30  import org.apache.cayenne.reflect.PersistentDescriptorFactory;
31  import org.apache.cayenne.reflect.PropertyException;
32  
33  /**
34   * A {@link ClassDescriptorFactory} that creates descriptors for classes implementing
35   * {@link DataObject}.
36   * 
37   * @since 3.0
38   * @author Andrus Adamchik
39   */
40  public class DataObjectDescriptorFactory extends PersistentDescriptorFactory {
41  
42      public DataObjectDescriptorFactory(ClassDescriptorMap descriptorMap) {
43          super(descriptorMap);
44      }
45  
46      protected ClassDescriptor getDescriptor(ObjEntity entity, Class   entityClass) {
47          if (!DataObject.class.isAssignableFrom(entityClass)) {
48              return null;
49          }
50  
51          return super.getDescriptor(entity, entityClass);
52      }
53  
54      protected PersistentDescriptor createDescriptor() {
55          return new DataObjectDescriptor();
56      }
57  
58      protected void createAttributeProperty(
59              PersistentDescriptor descriptor,
60              ObjAttribute attribute) {
61          descriptor.addDeclaredProperty(new DataObjectAttributeProperty(attribute));
62      }
63  
64      protected void createToManyProperty(
65              PersistentDescriptor descriptor,
66              ObjRelationship relationship) {
67  
68          ClassDescriptor targetDescriptor = descriptorMap.getDescriptor(relationship
69                  .getTargetEntityName());
70          descriptor.addDeclaredProperty(new DataObjectToManyProperty(
71                  relationship,
72                  targetDescriptor));
73      }
74  
75      protected void createToOneProperty(
76              PersistentDescriptor descriptor,
77              ObjRelationship relationship) {
78  
79          ClassDescriptor targetDescriptor = descriptorMap.getDescriptor(relationship
80                  .getTargetEntityName());
81          descriptor.addDeclaredProperty(new DataObjectToOneProperty(
82                  relationship,
83                  targetDescriptor));
84      }
85  
86      protected Accessor createAccessor(
87              PersistentDescriptor descriptor,
88              String   propertyName,
89              Class   propertyType) throws PropertyException {
90          return new DataObjectAccessor(propertyName);
91      }
92  }
93
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