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Java > Open Source Codes > net > sf > jasperreports > engine > data > JRMapCollectionDataSource


1 /*
2  * ============================================================================
3  * GNU Lesser General Public License
4  * ============================================================================
5  *
6  * JasperReports - Free Java report-generating library.
7  * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
8  *
9  * This library is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
22  *
23  * JasperSoft Corporation
24  * 303 Second Street, Suite 450 North
25  * San Francisco, CA 94107
26  * http://www.jaspersoft.com
27  */

28 package net.sf.jasperreports.engine.data;
29
30 import java.util.Collection JavaDoc;
31 import java.util.Iterator JavaDoc;
32 import java.util.Map JavaDoc;
33
34 import net.sf.jasperreports.engine.JRField;
35 import net.sf.jasperreports.engine.JRRewindableDataSource;
36
37 /**
38  * @author Teodor Danciu (teodord@users.sourceforge.net)
39  * @version $Id: JRMapCollectionDataSource.java 1229 2006-04-19 13:27:35 +0300 (Wed, 19 Apr 2006) teodord $
40  */

41 public class JRMapCollectionDataSource implements JRRewindableDataSource
42 {
43
44     /**
45      *
46      */

47     private Collection JavaDoc records = null;
48     private Iterator JavaDoc iterator = null;
49     private Map JavaDoc currentRecord = null;
50     
51
52     /**
53      *
54      */

55     public JRMapCollectionDataSource(Collection JavaDoc col)
56     {
57         records = col;
58
59         if (records != null)
60         {
61             iterator = records.iterator();
62         }
63     }
64     
65
66     /**
67      *
68      */

69     public boolean next()
70     {
71         boolean hasNext = false;
72         
73         if (iterator != null)
74         {
75             hasNext = iterator.hasNext();
76             
77             if (hasNext)
78             {
79                 currentRecord = (Map JavaDoc)iterator.next();
80             }
81         }
82         
83         return hasNext;
84     }
85     
86     
87     /**
88      *
89      */

90     public Object JavaDoc getFieldValue(JRField field)
91     {
92         Object JavaDoc value = null;
93         
94         if (currentRecord != null)
95         {
96             value = currentRecord.get(field.getName());
97         }
98
99         return value;
100     }
101
102     
103     /**
104      *
105      */

106     public void moveFirst()
107     {
108         if (records != null)
109         {
110             iterator = records.iterator();
111         }
112     }
113
114
115 }
116
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