001: /*
002: * $Id: RowDecorator.java,v 1.18 2006/01/10 21:02:37 ahimanikya Exp $
003: * =======================================================================
004: * Copyright (c) 2002-2004 Axion Development Team. All rights reserved.
005: *
006: * Redistribution and use in source and binary forms, with or without
007: * modification, are permitted provided that the following conditions
008: * are met:
009: *
010: * 1. Redistributions of source code must retain the above
011: * copyright notice, this list of conditions and the following
012: * disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The names "Tigris", "Axion", nor the names of its contributors may
020: * not be used to endorse or promote products derived from this
021: * software without specific prior written permission.
022: *
023: * 4. Products derived from this software may not be called "Axion", nor
024: * may "Tigris" or "Axion" appear in their names without specific prior
025: * written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
028: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
029: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030: * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
031: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
032: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
033: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
034: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
035: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
036: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
037: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038: * =======================================================================
039: */
040:
041: package org.axiondb;
042:
043: import java.util.Collections;
044: import java.util.Iterator;
045: import java.util.Map;
046:
047: /**
048: * A {@link org.axiondb.Row}with meta-information. (Note that we've intentionally not
049: * implemented <code>Row</code> here. <code>Row</code> and <code>RowDecorator</code>
050: * have different contracts. A reference to a <code>Row</code> is somewhat
051: * persistent--it can be added to a Collection, for example. A {@link RowDecorator}
052: * changes all the time.)
053: *
054: * @version $Revision: 1.18 $ $Date: 2006/01/10 21:02:37 $
055: * @author Rodney Waldhoff
056: * @author Ahimanikya Satapathy
057: */
058: public class RowDecorator {
059: public RowDecorator(Map selectableToFieldMap) {
060: _fieldMap = selectableToFieldMap;
061: }
062:
063: /** Returns the value of the specified column. */
064: public Object get(ColumnIdentifier colid) throws AxionException {
065: Integer index = (Integer) (_fieldMap
066: .get(getCanonicalForm(colid)));
067: if (null == index) {
068: throw new AxionException("Field " + colid + " not found.",
069: 42703);
070: }
071: Object obj = _row.get(index.intValue());
072: return colid.getDataType().convert(obj);
073: }
074:
075: /** Gets the {@link Row}I'm currently decorating. */
076: public Row getRow() {
077: return _row;
078: }
079:
080: public int getRowIndex() throws AxionException {
081: if (_rowndx == -1) {
082: throw new AxionException("Row index not available.");
083: }
084: return _rowndx;
085: }
086:
087: /** Gets the selectable To Field Iterator */
088: public Iterator getSelectableIterator() {
089: return Collections.unmodifiableSet(_fieldMap.keySet())
090: .iterator();
091: }
092:
093: /** Sets the {@link Row}I'm currently decorating. */
094: public void setRow(int rowndx, Row row) {
095: _rowndx = rowndx;
096: _row = row;
097: }
098:
099: /** Sets the {@link Row}I'm currently decorating. */
100: public void setRow(Row row) {
101: setRow(-1, row);
102: }
103:
104: private ColumnIdentifier getCanonicalForm(ColumnIdentifier colid) {
105: if (null == colid) {
106: return null;
107: }
108: return colid.getCanonicalIdentifier();
109: }
110:
111: private Map _fieldMap;
112: private Row _row;
113: private int _rowndx = -1;
114: }
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