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Java > Open Source Codes > org > apache > cayenne > intercept > DataChannelDecorator


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19 package org.apache.cayenne.intercept;
20
21 import org.apache.cayenne.DataChannel;
22 import org.apache.cayenne.ObjectContext;
23 import org.apache.cayenne.QueryResponse;
24 import org.apache.cayenne.event.EventManager;
25 import org.apache.cayenne.graph.GraphDiff;
26 import org.apache.cayenne.map.EntityResolver;
27 import org.apache.cayenne.query.Query;
28
29 /**
30  * A helper {@link DataChannel} implementation that passes all requests to the underlying
31  * decorated channel for execution. Intended for subclassing.
32  *
33  * @since 3.0
34  * @author Andrus Adamchik
35  */
36 public class DataChannelDecorator implements DataChannel {
37
38     protected DataChannel channel;
39
40     protected DataChannelDecorator() {
41
42     }
43
44     public DataChannelDecorator(DataChannel channel) {
45         setChannel(channel);
46     }
47
48     public EntityResolver getEntityResolver() {
49         return channel.getEntityResolver();
50     }
51
52     public EventManager getEventManager() {
53         return channel.getEventManager();
54     }
55
56     public QueryResponse onQuery(ObjectContext originatingContext, Query query) {
57         return channel.onQuery(originatingContext, query);
58     }
59
60     public GraphDiff onSync(
61             ObjectContext originatingContext,
62             GraphDiff changes,
63             int syncType) {
64         return channel.onSync(originatingContext, changes, syncType);
65     }
66
67     public DataChannel getChannel() {
68         return channel;
69     }
70
71     public void setChannel(DataChannel channel) {
72         // TODO: andrus, 9/20/2006 - register as listener of the channel events
73 this.channel = channel;
74     }
75 }
76
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