1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * <BR><BR>
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9 | *
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10 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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11 | *
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12 | * <BR><BR>
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13 | *
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14 | * Copyright (C) 1999 New Zealand Digital Library Project
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15 | *
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16 | * <BR><BR>
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17 | *
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18 | * This program is free software; you can redistribute it and/or modify
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19 | * it under the terms of the GNU General Public License as published by
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20 | * the Free Software Foundation; either version 2 of the License, or
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21 | * (at your option) any later version.
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22 | *
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23 | * <BR><BR>
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24 | *
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25 | * This program is distributed in the hope that it will be useful,
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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28 | * GNU General Public License for more details.
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29 | *
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30 | * <BR><BR>
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31 | *
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32 | * You should have received a copy of the GNU General Public License
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33 | * along with this program; if not, write to the Free Software
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34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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35 | *########################################################################
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36 | */
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37 | package org.greenstone.gatherer.gui.metaaudit;
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38 |
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39 | /**************************************************************************************
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40 | * Title: Gatherer
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41 | * Description: The Gatherer: a tool for gathering and enriching a digital collection.
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42 | * Company: The University of Waikato
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43 | * Written: 03/09/02
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44 | * Revised: 04/10/02 - Commented
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45 | **************************************************************************************/
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46 | import de.qfs.lib.gui.TableModelFilter;
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47 | import de.qfs.lib.gui.TableModelFilterEvent;
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48 | import de.qfs.lib.gui.TableModelFilterListener;
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49 | import java.util.ArrayList;
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50 | import java.util.Enumeration;
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51 | import java.util.Vector;
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52 | import javax.swing.table.TableModel;
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53 |
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54 | /** This class essentially manages the autofilters applied to the metaaudit table.
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55 | * @author John Thompson
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56 | * @version 2.3
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57 | */
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58 | public class Filter
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59 | implements TableModelFilter {
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60 | /** An array of autofilters. */
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61 | private Autofilter filters[];
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62 | /** The registered TableModelFilterListeners. */
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63 | private Vector listeners = new Vector ();
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64 | /** Constructor.
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65 | * @param columns The number of columns this Filter will be expected to filter, as an <i>int</i>.
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66 | */
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67 | public Filter(int columns) {
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68 | filters = new Autofilter[columns];
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69 | }
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70 | /** Add a TableModelFilterListener to the TableModelFilter.
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71 | * @param listener The <strong>TableModelFilterListener</strong> to add, if it isn't already registered.
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72 | */
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73 | public synchronized void addTableModelFilterListener(TableModelFilterListener listener) {
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74 | if (!listeners.contains(listener)) {
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75 | listeners.addElement(listener);
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76 | }
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77 | }
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78 | /** Remove a filter from a column.
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79 | * @param column The column number to remove the filter from, as an <i>int</i>.
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80 | */
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81 | public void clearFilter(int column) {
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82 | if(filters[column] != null) {
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83 | filters[column].setActive(false);
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84 | }
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85 | }
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86 | /** Determine if a certain row should be shown in the table by checking it against all the current filters.
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87 | * @param model The <strong>TableModel</strong> the row is from.
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88 | * @param row The row number as an <i>int</i>
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89 | * @return <i>true</i> if the rows data matches all autofilters set and should be displayed, <i>false</i> otherwise.
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90 | */
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91 | public boolean filter(TableModel model, int row) {
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92 | boolean result = true;
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93 | for(int i = 0; result && i < filters.length; i++) {
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94 | if(filters[i] != null && filters[i].active()) {
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95 | ArrayList values = (ArrayList) model.getValueAt(row, i);
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96 | result = result && filters[i].filter(values);
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97 | }
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98 | }
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99 | return result;
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100 | }
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101 | /** Retrieve the autofilter associated with a certain column.
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102 | * @param column The column number as an <i>int</i>.
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103 | * @return The <strong>Autofilter</strong> assigned to that column.
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104 | */
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105 | public Autofilter getFilter(int column) {
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106 | Autofilter filter = filters[column];
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107 | if(filter == null) {
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108 | filter = new Autofilter();
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109 | filters[column] = filter;
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110 | }
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111 | return filter;
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112 | }
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113 | /** Determine if a certain column is filtered.
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114 | * @param column The column number as an <i>int</i>.
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115 | * @return <i>true</i> if there is an active autofilter assigned to this column, <i>false</i> otherwise.
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116 | */
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117 | public boolean isFiltered(int column) {
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118 | boolean result = false;
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119 | if(filters[column] != null) {
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120 | result = filters[column].active();
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121 | }
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122 | return result;
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123 | }
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124 | /** Remove a TableModelFilterListener from the TableModelFilter.
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125 | * @param listener The <strong>TableModelFilterListener</strong> to remove.
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126 | */
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127 | public synchronized void removeTableModelFilterListener(TableModelFilterListener listener) {
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128 | listeners.removeElement(listener);
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129 | }
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130 | /** Called whenever the filters assigned changes significantly, thus prompting a reload of the table model data. */
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131 | public void fireFilterChanged() {
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132 | ///ystem.err.println("Filter Changed!");
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133 | Vector tmp;
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134 | synchronized(this) {
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135 | tmp = (Vector) listeners.clone();
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136 | }
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137 |
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138 | TableModelFilterEvent event = new TableModelFilterEvent (this);
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139 | for (Enumeration enum = tmp.elements();
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140 | enum.hasMoreElements(); ) {
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141 | ((TableModelFilterListener)enum.nextElement()).filterChanged(event);
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142 | }
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143 | }
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144 | }
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