Source Code Cross Referenced for SortedTableModel.java in  » Swing-Library » Swinglets » com » javelin » swinglets » table » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Swing Library » Swinglets » com.javelin.swinglets.table 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright Javelin Software, All rights reserved.
003:         */
004:
005:        package com.javelin.swinglets.table;
006:
007:        import java.lang.reflect.*;
008:        import java.awt.event.*;
009:        import java.util.Vector;
010:
011:        import javax.swing.event.*;
012:        import javax.swing.table.*;
013:
014:        //import com.sun.java.util.collections.Comparator;
015:        import java.util.Comparator;
016:
017:        /**
018:         * The SortedTableModel provides a TableModel that sorts using a 
019:         * java 11 collections Comparator or java.util.Comparator.
020:         * <p>
021:         * @author Robin Sharp
022:         */
023:
024:        public class SortedTableModel extends AbstractTableModel implements 
025:                TableModelListener, SortByColumn {
026:            public SortedTableModel(TableModel model) {
027:                this .model = model;
028:                this .model.addTableModelListener(this );
029:                reallocateIndexes();
030:            }
031:
032:            // TABLE MODEL ////////////////////////////////////////////////////////////
033:
034:            /**
035:             * Delegate method the the underlying model.
036:             */
037:            public Object getValueAt(int aRow, int aColumn) {
038:                if (ascending == NATURAL) {
039:                    return model.getValueAt(aRow, aColumn);
040:                } else {
041:                    checkModel();
042:                    return model.getValueAt(indexes[aRow], aColumn);
043:                }
044:            }
045:
046:            /**
047:             * Delegate method the the underlying model.
048:             */
049:            public void setValueAt(Object aValue, int aRow, int aColumn) {
050:                checkModel();
051:                model.setValueAt(aValue, indexes[aRow], aColumn);
052:            }
053:
054:            /**
055:             * Delegate method the the underlying model.
056:             */
057:            public int getRowCount() {
058:                return model.getRowCount();
059:            }
060:
061:            /**
062:             * Delegate method the the underlying model.
063:             */
064:            public int getColumnCount() {
065:                return model.getColumnCount();
066:            }
067:
068:            /**
069:             * Delegate method the the underlying model.
070:             */
071:            public String getColumnName(int aColumn) {
072:                return model.getColumnName(aColumn);
073:            }
074:
075:            /**
076:             * Delegate method the the underlying model.
077:             */
078:            public Class getColumnClass(int aColumn) {
079:                return model.getColumnClass(aColumn);
080:            }
081:
082:            /**
083:             * Delegate method the the underlying model.
084:             */
085:            public boolean isCellEditable(int row, int column) {
086:                return model.isCellEditable(row, column);
087:            }
088:
089:            // SORTED TABLE MODEL //////////////////////////////////////////////////////
090:
091:            /**
092:             * Get the comparator used to do the Sorting.
093:             * This defaults to JDK11Comparator. 
094:             */
095:            public Object getComparator() {
096:                return comparator;
097:            }
098:
099:            /**
100:             * Set a new Comparator.
101:             * <p>
102:             * @exception IllegalArgumentException if the class does not implement 
103:             * the com.sun.java.util.collections.Comparator or the
104:             * java.util.Comparator.
105:             */
106:            public void setComparator(Object comparator)
107:                    throws IllegalArgumentException {
108:                this .comparator = comparator;
109:
110:                if (!(comparator instanceof  Comparator)) {
111:                    throw new IllegalArgumentException(
112:                            "Object does not implement the Comparator interface.");
113:                }
114:
115:            }
116:
117:            /**
118:             * Get the delegate table model.
119:             */
120:            public TableModel getModel() {
121:                return model;
122:            }
123:
124:            public final static int ASCENDING = 1;
125:            public final static int NATURAL = 0;
126:            public final static int DESCENDING = -1;
127:
128:            /**
129:             * @return ASCENDING, NATURAL, DESCENDING
130:             */
131:            public int getSortType() {
132:                return ascending;
133:            }
134:
135:            /**
136:             * Set the lowIndex for the sort.
137:             */
138:            public void setLowIndex(int lowIndex) {
139:                this .lowIndex = lowIndex;
140:            }
141:
142:            public int getSortedIndex() {
143:                return sortedIndex;
144:            }
145:
146:            public int compareRowsByColumn(int row1, int row2, int column) {
147:                Class type = model.getColumnClass(column);
148:                TableModel data = model;
149:
150:                // Check for nulls.
151:
152:                Object o1 = data.getValueAt(row1, column);
153:                Object o2 = data.getValueAt(row2, column);
154:
155:                if (o1 == null && o2 == null) {
156:                    // If both values are null, return 0.
157:                    return 0;
158:                } else if (o1 == null) {
159:                    // Define null less than everything. 
160:                    return -1;
161:                } else if (o2 == null) {
162:                    return 1;
163:                }
164:
165:                if (comparator != null) {
166:                    if (comparator instanceof  Comparator) {
167:                        return ((Comparator) comparator).compare(o1, o2);
168:                    }
169:                }
170:
171:                //Can't compare
172:                return 0;
173:            }
174:
175:            public int compare(int row1, int row2) {
176:                compares++;
177:                for (int level = 0; level < sortingColumns.size(); level++) {
178:                    Integer column = (Integer) sortingColumns.elementAt(level);
179:                    int result = compareRowsByColumn(row1, row2, column
180:                            .intValue());
181:                    if (result != 0) {
182:                        return ascending == ASCENDING ? result : -result;
183:                    }
184:                }
185:
186:                return 0;
187:            }
188:
189:            public void reallocateIndexes() {
190:                int rowCount = model.getRowCount();
191:
192:                // Set up a new array of indexes with the right number of elements
193:                // for the new data model.
194:                indexes = new int[rowCount];
195:
196:                // Initialise with the identity mapping.
197:                for (int row = 0; row < rowCount; row++) {
198:                    indexes[row] = row;
199:                }
200:            }
201:
202:            public void checkModel() {
203:                if (indexes.length != model.getRowCount()) {
204:                    System.err
205:                            .println("Sorter not informed of a change in model.");
206:                }
207:            }
208:
209:            public void sort() {
210:                checkModel();
211:                compares = 0;
212:                sort((int[]) indexes.clone(), indexes, lowIndex, indexes.length);
213:            }
214:
215:            public void sort(int from[], int to[], int low, int high) {
216:                if (high - low < 2) {
217:                    return;
218:                }
219:                int middle = (low + high) / 2;
220:                sort(to, from, low, middle);
221:                sort(to, from, middle, high);
222:
223:                int p = low;
224:                int q = middle;
225:
226:                if (high - low >= 4
227:                        && compare(from[middle - 1], from[middle]) <= 0) {
228:                    for (int i = low; i < high; i++) {
229:                        to[i] = from[i];
230:                    }
231:                    return;
232:                }
233:
234:                // A normal merge. 
235:                for (int i = low; i < high; i++) {
236:                    if (q >= high
237:                            || (p < middle && compare(from[p], from[q]) <= 0)) {
238:                        to[i] = from[p++];
239:                    } else {
240:                        to[i] = from[q++];
241:                    }
242:                }
243:            }
244:
245:            public void swap(int i, int j) {
246:                int tmp = indexes[i];
247:                indexes[i] = indexes[j];
248:                indexes[j] = tmp;
249:            }
250:
251:            public void sortByColumn(int column) {
252:                if (lastSortedColumn == column) {
253:                    if (ascending == DESCENDING)
254:                        ascending = ASCENDING;
255:                    else if (ascending == ASCENDING)
256:                        ascending = DESCENDING;
257:                    else if (ascending == NATURAL)
258:                        ascending = ASCENDING;
259:
260:                } else {
261:                    ascending = ASCENDING;
262:                }
263:
264:                lastSortedColumn = column;
265:
266:                sortedIndex = column;
267:                sortingColumns.removeAllElements();
268:                sortingColumns.addElement(new Integer(column));
269:                sort();
270:                fireTableChanged(new TableModelEvent(this ));
271:            }
272:
273:            // TABLE MODEL LISTENER ////////////////////////////////////////
274:
275:            public void tableChanged(TableModelEvent e) {
276:                reallocateIndexes();
277:                fireTableChanged(e);
278:            }
279:
280:            // PRIVATE /////////////////////////////////////////////////////
281:
282:            protected TableModel model;
283:
284:            //The type of sorting to be done
285:            private int ascending = DESCENDING;
286:
287:            private int indexes[];
288:            private Vector sortingColumns = new Vector();
289:            private int compares;
290:            private int sortedIndex;
291:            private int lowIndex;
292:
293:            private int lastSortedColumn;
294:
295:            private Object comparator = new JDK11Comparator();
296:
297:        }
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