Source Code Cross Referenced for PagedTableModel.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:         * PagedTableModel is a TableModel that can page.
019:         * 
020:         * @author Robin Sharp
021:         */
022:
023:        public class PagedTableModel extends AbstractTableModel implements 
024:                TableModelListener, SortByColumn {
025:            public PagedTableModel(TableModel model, int pageSize) {
026:                this .pageSize = pageSize;
027:                this .model = model;
028:                this .model.addTableModelListener(this );
029:                reallocateIndexes();
030:            }
031:
032:            public PagedTableModel(TableModel model) {
033:                this (model, 10);
034:            }
035:
036:            // TABLE MODEL ////////////////////////////////////////////////////////////
037:
038:            /**
039:             * Delegate method the the underlying model.
040:             */
041:            public Object getValueAt(int aRow, int aColumn) {
042:                if (ascending == NATURAL) {
043:                    return model.getValueAt(aRow + offset, aColumn);
044:                } else {
045:                    checkModel();
046:                    int idx = Math.min(aRow + offset, indexes.length - 1);
047:                    //System.out.println(aRow+" "+offset+" "+(indexes.length-1));
048:                    return model.getValueAt(indexes[idx], aColumn);
049:                }
050:            }
051:
052:            /**
053:             * Delegate method the the underlying model.
054:             */
055:            public void setValueAt(Object aValue, int aRow, int aColumn) {
056:                checkModel();
057:                model.setValueAt(aValue, indexes[aRow], aColumn);
058:            }
059:
060:            /**
061:             * Delegate method the the underlying model.
062:             */
063:            public int getRowCount() {
064:                return Math.min(pageSize, model.getRowCount() - offset);
065:            }
066:
067:            /**
068:             * Delegate method the the underlying model.
069:             */
070:            public int getColumnCount() {
071:                return model.getColumnCount();
072:            }
073:
074:            /**
075:             * Delegate method the the underlying model.
076:             */
077:            public String getColumnName(int aColumn) {
078:                return model.getColumnName(aColumn);
079:            }
080:
081:            /**
082:             * Delegate method the the underlying model.
083:             */
084:            public Class getColumnClass(int aColumn) {
085:                return model.getColumnClass(aColumn);
086:            }
087:
088:            /**
089:             * Delegate method the the underlying model.
090:             */
091:            public boolean isCellEditable(int row, int column) {
092:                return model.isCellEditable(row, column);
093:            }
094:
095:            // SORTED TABLE MODEL //////////////////////////////////////////////////////
096:
097:            /**
098:             * Get the comparator used to do the Sorting.
099:             * This defaults to JDK11Comparator. 
100:             */
101:            public Object getComparator() {
102:                return comparator;
103:            }
104:
105:            /**
106:             * Set a new Comparator.
107:             * <p>
108:             * @exception IllegalArgumentException if the class does not implement 
109:             * the com.sun.java.util.collections.Comparator or the
110:             * java.util.Comparator.
111:             */
112:            public void setComparator(Object comparator)
113:                    throws IllegalArgumentException {
114:                this .comparator = comparator;
115:
116:                if (!(comparator instanceof  Comparator)) {
117:                    throw new IllegalArgumentException(
118:                            "Object does not implement the Comparator interface.");
119:                }
120:
121:            }
122:
123:            /**
124:             * Get the delegate table model.
125:             */
126:            public TableModel getModel() {
127:                return model;
128:            }
129:
130:            public final static int ASCENDING = 1;
131:            public final static int NATURAL = 0;
132:            public final static int DESCENDING = -1;
133:
134:            /**
135:             * @return ASCENDING, NATURAL, DESCENDING
136:             */
137:            public int getSortType() {
138:                return ascending;
139:            }
140:
141:            /**
142:             * Set the lowIndex for the sort.
143:             */
144:            public void setLowIndex(int lowIndex) {
145:                this .lowIndex = lowIndex;
146:            }
147:
148:            public int getSortedIndex() {
149:                return sortedIndex;
150:            }
151:
152:            public int compareRowsByColumn(int row1, int row2, int column) {
153:                Class type = model.getColumnClass(column);
154:                TableModel data = model;
155:
156:                // Check for nulls.
157:
158:                Object o1 = data.getValueAt(row1, column);
159:                Object o2 = data.getValueAt(row2, column);
160:
161:                if (o1 == null && o2 == null) {
162:                    // If both values are null, return 0.
163:                    return 0;
164:                } else if (o1 == null) {
165:                    // Define null less than everything. 
166:                    return -1;
167:                } else if (o2 == null) {
168:                    return 1;
169:                }
170:
171:                if (comparator != null) {
172:                    if (comparator instanceof  Comparator) {
173:                        return ((Comparator) comparator).compare(o1, o2);
174:                    }
175:                }
176:
177:                //Can't compare
178:                return 0;
179:            }
180:
181:            public int compare(int row1, int row2) {
182:                compares++;
183:                for (int level = 0; level < sortingColumns.size(); level++) {
184:                    Integer column = (Integer) sortingColumns.elementAt(level);
185:                    int result = compareRowsByColumn(row1, row2, column
186:                            .intValue());
187:                    if (result != 0) {
188:                        return ascending == ASCENDING ? result : -result;
189:                    }
190:                }
191:
192:                return 0;
193:            }
194:
195:            public void reallocateIndexes() {
196:                int rowCount = model.getRowCount();
197:
198:                // Set up a new array of indexes with the right number of elements
199:                // for the new data model.
200:                indexes = new int[rowCount];
201:
202:                // Initialise with the identity mapping.
203:                for (int row = 0; row < rowCount; row++) {
204:                    indexes[row] = row;
205:                }
206:            }
207:
208:            public void checkModel() {
209:                if (indexes.length != model.getRowCount()) {
210:                    System.err
211:                            .println("Sorter not informed of a change in model!");
212:                }
213:            }
214:
215:            public void sort() {
216:                checkModel();
217:                compares = 0;
218:                sort((int[]) indexes.clone(), indexes, lowIndex, indexes.length);
219:            }
220:
221:            public void sort(int from[], int to[], int low, int high) {
222:                if (high - low < 2) {
223:                    return;
224:                }
225:                int middle = (low + high) / 2;
226:                sort(to, from, low, middle);
227:                sort(to, from, middle, high);
228:
229:                int p = low;
230:                int q = middle;
231:
232:                if (high - low >= 4
233:                        && compare(from[middle - 1], from[middle]) <= 0) {
234:                    for (int i = low; i < high; i++) {
235:                        to[i] = from[i];
236:                    }
237:                    return;
238:                }
239:
240:                // A normal merge. 
241:                for (int i = low; i < high; i++) {
242:                    if (q >= high
243:                            || (p < middle && compare(from[p], from[q]) <= 0)) {
244:                        to[i] = from[p++];
245:                    } else {
246:                        to[i] = from[q++];
247:                    }
248:                }
249:            }
250:
251:            public void swap(int i, int j) {
252:                int tmp = indexes[i];
253:                indexes[i] = indexes[j];
254:                indexes[j] = tmp;
255:            }
256:
257:            public void sortByColumn(int column) {
258:                if (lastSortedColumn == column) {
259:                    if (ascending == DESCENDING)
260:                        ascending = ASCENDING;
261:                    else if (ascending == ASCENDING)
262:                        ascending = DESCENDING;
263:                    else if (ascending == NATURAL)
264:                        ascending = ASCENDING;
265:
266:                } else {
267:                    ascending = ASCENDING;
268:                }
269:
270:                lastSortedColumn = column;
271:
272:                sortedIndex = column;
273:                sortingColumns.removeAllElements();
274:                sortingColumns.addElement(new Integer(column));
275:                sort();
276:                fireTableChanged(new TableModelEvent(this ));
277:                gotoStart();
278:            }
279:
280:            /**
281:             * Set the size of each page.
282:             */
283:            public void setPageSize(int pageSize) {
284:                this .pageSize = pageSize;
285:            }
286:
287:            /**
288:             * Get the size of each page.
289:             */
290:            public int getPageSize() {
291:                return pageSize;
292:            }
293:
294:            public void setOffset(int Offset) {
295:                this .offset = offset;
296:            }
297:
298:            public int getOffset() {
299:                return offset;
300:            }
301:
302:            public void gotoStart() {
303:                offset = 0;
304:            }
305:
306:            public void gotoEnd() {
307:                int count = model.getRowCount();
308:                offset = count - count % pageSize;
309:                if (offset < 0) {
310:                    gotoStart();
311:                }
312:            }
313:
314:            public void gotoNext() {
315:                offset += pageSize;
316:                if (offset > model.getRowCount()) {
317:                    gotoEnd();
318:                }
319:            }
320:
321:            public void gotoPrev() {
322:                offset -= pageSize;
323:                if (offset < 0) {
324:                    gotoStart();
325:                }
326:            }
327:
328:            // TABLE MODEL LISTENER ////////////////////////////////////////
329:
330:            public void tableChanged(TableModelEvent e) {
331:                reallocateIndexes();
332:                fireTableChanged(e);
333:            }
334:
335:            // PRIVATE /////////////////////////////////////////////////////
336:
337:            protected TableModel model;
338:
339:            //The type of sorting to be done
340:            private int ascending = DESCENDING;
341:
342:            private int indexes[];
343:            private Vector sortingColumns = new Vector();
344:            private int compares;
345:            private int sortedIndex;
346:            private int lowIndex;
347:
348:            private int lastSortedColumn;
349:
350:            private Object comparator = new JDK11Comparator();
351:
352:            protected int pageSize = 10;
353:
354:            protected int offset = 0;
355:
356:        }
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