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Java > Open Source Codes > org > objectstyle > cayenne > access > util > IteratedSelectObserver


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.
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17  * notice, this list of conditions and the following disclaimer in
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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".
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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.
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37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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48  * SUCH DAMAGE.
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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.util;
58
59 import java.io.IOException JavaDoc;
60 import java.io.PrintWriter JavaDoc;
61 import java.io.StringWriter JavaDoc;
62 import java.util.List JavaDoc;
63
64 import org.objectstyle.cayenne.CayenneException;
65 import org.objectstyle.cayenne.CayenneRuntimeException;
66 import org.objectstyle.cayenne.access.ResultIterator;
67 import org.objectstyle.cayenne.query.Query;
68
69 /**
70  * OperationObserver that is used to track the execution
71  * of SelectQueries with results returned as ResultIterator.
72  *
73  * @author Andrei Adamchik
74  */
75 public class IteratedSelectObserver extends DefaultOperationObserver {
76     protected ResultIterator resultIterator;
77
78     public boolean isIteratedResult() {
79         return true;
80     }
81
82     public void nextDataRows(Query query, List JavaDoc dataRows) {
83         throw new CayenneRuntimeException("Results unexpectedly returned as list.");
84     }
85
86     public void nextDataRows(Query q, ResultIterator it) {
87         // don't call super - it closes the iterator
88 resultIterator = it;
89     }
90
91     public ResultIterator getResultIterator() throws CayenneException {
92         if (super.hasExceptions()) {
93             StringWriter JavaDoc str = new StringWriter JavaDoc();
94             PrintWriter JavaDoc out = new PrintWriter JavaDoc(str);
95             super.printExceptions(out);
96
97             try {
98                 out.close();
99                 str.close();
100             } catch (IOException JavaDoc ioex) {
101                 // this should never happen
102 }
103
104             throw new CayenneException(
105                 "Error getting ResultIterator: " + str.getBuffer());
106         }
107
108         return resultIterator;
109     }
110
111 }
112
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