001: /*
002: * ============================================================================
003: * GNU Lesser General Public License
004: * ============================================================================
005: *
006: * JasperReports - Free Java report-generating library.
007: * Copyright (C) 2001-2006 JasperSoft Corporation http://www.jaspersoft.com
008: *
009: * This library is free software; you can redistribute it and/or
010: * modify it under the terms of the GNU Lesser General Public
011: * License as published by the Free Software Foundation; either
012: * version 2.1 of the License, or (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
017: * Lesser General Public License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
022: *
023: * JasperSoft Corporation
024: * 303 Second Street, Suite 450 North
025: * San Francisco, CA 94107
026: * http://www.jaspersoft.com
027: */
028: package net.sf.jasperreports.engine.data;
029:
030: import java.util.Collection;
031: import java.util.Iterator;
032: import java.util.Map;
033:
034: import net.sf.jasperreports.engine.JRField;
035: import net.sf.jasperreports.engine.JRRewindableDataSource;
036:
037: /**
038: * @author Teodor Danciu (teodord@users.sourceforge.net)
039: * @version $Id: JRMapCollectionDataSource.java 1229 2006-04-19 10:27:35Z teodord $
040: */
041: public class JRMapCollectionDataSource implements
042: JRRewindableDataSource {
043:
044: /**
045: *
046: */
047: private Collection records = null;
048: private Iterator iterator = null;
049: private Map currentRecord = null;
050:
051: /**
052: *
053: */
054: public JRMapCollectionDataSource(Collection col) {
055: records = col;
056:
057: if (records != null) {
058: iterator = records.iterator();
059: }
060: }
061:
062: /**
063: *
064: */
065: public boolean next() {
066: boolean hasNext = false;
067:
068: if (iterator != null) {
069: hasNext = iterator.hasNext();
070:
071: if (hasNext) {
072: currentRecord = (Map) iterator.next();
073: }
074: }
075:
076: return hasNext;
077: }
078:
079: /**
080: *
081: */
082: public Object getFieldValue(JRField field) {
083: Object value = null;
084:
085: if (currentRecord != null) {
086: value = currentRecord.get(field.getName());
087: }
088:
089: return value;
090: }
091:
092: /**
093: *
094: */
095: public void moveFirst() {
096: if (records != null) {
097: iterator = records.iterator();
098: }
099: }
100:
101: }
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