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Java > Open Source Codes > org > apache > cayenne > access > DataNodeQueryAction


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19
20 package org.apache.cayenne.access;
21
22 import java.sql.Connection JavaDoc;
23 import java.sql.SQLException JavaDoc;
24 import java.util.List JavaDoc;
25
26 import org.apache.cayenne.query.Query;
27 import org.apache.cayenne.query.SQLAction;
28
29 /**
30  * A helper that executes a sequence of queries, providing correct mapping of the results
31  * to the original query. Note that this class is not thread-safe as it stores current
32  * query execution state.
33  *
34  * @since 1.2
35  * @author Andrus Adamchik
36  */
37 class DataNodeQueryAction implements OperationObserver {
38
39     OperationObserver observer;
40     DataNode node;
41
42     private Query currentQuery;
43
44     public DataNodeQueryAction(DataNode node, OperationObserver observer) {
45         this.observer = observer;
46         this.node = node;
47     }
48
49     public void runQuery(Connection JavaDoc connection, Query query) throws SQLException JavaDoc,
50             Exception JavaDoc {
51
52         // remember root query ... it will be used to map the results, even if SQLAction
53 // uses query substitute...
54 this.currentQuery = query;
55
56         SQLAction action = node.getAdapter().getAction(query, node);
57         action.performAction(connection, this);
58     }
59
60     public void nextBatchCount(Query query, int[] resultCount) {
61         observer.nextBatchCount(currentQuery, resultCount);
62     }
63
64     public void nextCount(Query query, int resultCount) {
65         observer.nextCount(currentQuery, resultCount);
66     }
67
68     public void nextDataRows(Query query, List JavaDoc dataRows) {
69         observer.nextDataRows(currentQuery, dataRows);
70     }
71
72     public void nextDataRows(Query q, ResultIterator it) {
73         observer.nextDataRows(currentQuery, it);
74     }
75
76     public void nextGeneratedDataRows(Query query, ResultIterator keysIterator) {
77         observer.nextGeneratedDataRows(currentQuery, keysIterator);
78     }
79
80     public void nextGlobalException(Exception JavaDoc ex) {
81         observer.nextGlobalException(ex);
82     }
83
84     public void nextQueryException(Query query, Exception JavaDoc ex) {
85         observer.nextQueryException(currentQuery, ex);
86     }
87
88     public boolean isIteratedResult() {
89         return observer.isIteratedResult();
90     }
91 }
92
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