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


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
32  *
33  * 5. Products derived from this software may not be called "ObjectStyle"
34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */

56
57 package org.objectstyle.cayenne.access;
58
59 import java.sql.Connection JavaDoc;
60 import java.sql.SQLException JavaDoc;
61 import java.util.List JavaDoc;
62
63 import org.apache.log4j.Level;
64 import org.objectstyle.cayenne.query.Query;
65 import org.objectstyle.cayenne.query.SQLAction;
66
67 /**
68  * A helper that executes a sequence of queries, providing correct mapping of the results
69  * to the original query. Note that this class is not thread-safe as it stores current
70  * query execution state.
71  *
72  * @since 1.2
73  * @author Andrus Adamchik
74  */

75 class DataNodeQueryAction implements OperationObserver {
76
77     OperationObserver observer;
78     DataNode node;
79
80     private Query currentQuery;
81
82     public DataNodeQueryAction(DataNode node, OperationObserver observer) {
83         this.observer = observer;
84         this.node = node;
85     }
86
87     public void runQuery(Connection JavaDoc connection, Query query) throws SQLException JavaDoc,
88             Exception JavaDoc {
89
90         // remember root query ... it will be used to map the results, even if SQLAction
91
// uses query substitute...
92
this.currentQuery = query;
93
94         SQLAction action = node.getAdapter().getAction(query, node);
95         action.performAction(connection, this);
96     }
97
98     public void nextBatchCount(Query query, int[] resultCount) {
99         observer.nextBatchCount(currentQuery, resultCount);
100     }
101
102     public void nextCount(Query query, int resultCount) {
103         observer.nextCount(currentQuery, resultCount);
104     }
105
106     public void nextDataRows(Query query, List JavaDoc dataRows) {
107         observer.nextDataRows(currentQuery, dataRows);
108     }
109
110     public void nextDataRows(Query q, ResultIterator it) {
111         observer.nextDataRows(currentQuery, it);
112     }
113
114     public void nextGeneratedDataRows(Query query, ResultIterator keysIterator) {
115         observer.nextGeneratedDataRows(currentQuery, keysIterator);
116     }
117
118     public void nextGlobalException(Exception JavaDoc ex) {
119         observer.nextGlobalException(ex);
120     }
121
122     public void nextQueryException(Query query, Exception JavaDoc ex) {
123         observer.nextQueryException(currentQuery, ex);
124     }
125
126     public Level getLoggingLevel() {
127         return observer.getLoggingLevel();
128     }
129
130     public boolean isIteratedResult() {
131         return observer.isIteratedResult();
132     }
133 }
134
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