Source Code Cross Referenced for JoSQLFreeChartCategoryDataset.java in  » Development » JoSQL » org » josql » contrib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » JoSQL » org.josql.contrib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2004-2007 Gary Bentley 
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License"); you may 
005:         * not use this file except in compliance with the License. 
006:         * You may obtain a copy of the License at 
007:         *    http://www.apache.org/licenses/LICENSE-2.0 
008:         *
009:         * Unless required by applicable law or agreed to in writing, software 
010:         * distributed under the License is distributed on an "AS IS" BASIS, 
011:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
012:         * See the License for the specific language governing permissions and 
013:         * limitations under the License.
014:         */
015:        package org.josql.contrib;
016:
017:        import java.util.List;
018:        import java.util.ArrayList;
019:        import java.util.Arrays;
020:
021:        import org.jfree.data.category.CategoryDataset;
022:
023:        import org.jfree.data.DomainOrder;
024:
025:        import org.jfree.data.general.DatasetGroup;
026:        import org.jfree.data.general.DatasetChangeListener;
027:        import org.jfree.data.general.DatasetChangeEvent;
028:
029:        import org.josql.Query;
030:        import org.josql.QueryResults;
031:        import org.josql.QueryExecutionException;
032:        import org.josql.QueryParseException;
033:
034:        import org.josql.internal.Utilities;
035:
036:        import org.josql.expressions.SelectItemExpression;
037:
038:        public class JoSQLFreeChartCategoryDataset extends Query implements 
039:                CategoryDataset {
040:
041:            private QueryResults results = null;
042:            private int xCol = 0;
043:            private List yCols = null;
044:            private List listeners = new ArrayList();
045:            private DatasetGroup group = null;
046:
047:            public JoSQLFreeChartCategoryDataset() {
048:
049:            }
050:
051:            public void addChangeListener(DatasetChangeListener l) {
052:
053:                this .listeners.add(l);
054:
055:            }
056:
057:            public void removeChangeListener(DatasetChangeListener l) {
058:
059:                this .listeners.remove(l);
060:
061:            }
062:
063:            public DatasetGroup getGroup() {
064:
065:                return this .group;
066:
067:            }
068:
069:            /**
070:             * Get any results, will be null unless {@link #execute(List)} has been called.
071:             *
072:             * @return The results.
073:             */
074:            public QueryResults getResults() {
075:
076:                return this .results;
077:
078:            }
079:
080:            /**
081:             * Clear any results.
082:             */
083:            public void clearResults() {
084:
085:                this .results = null;
086:
087:            }
088:
089:            public void setGroup(DatasetGroup g) {
090:
091:                this .group = g;
092:
093:            }
094:
095:            public void define(int xCol, Object[] yCols)
096:                    throws IllegalArgumentException, IllegalStateException,
097:                    QueryParseException {
098:
099:                this .define(xCol, Arrays.asList(yCols));
100:
101:            }
102:
103:            public void define(int xCol, int[] yCols)
104:                    throws IllegalArgumentException, IllegalStateException,
105:                    QueryParseException {
106:
107:                List l = new ArrayList(yCols.length);
108:
109:                for (int i = 0; i < yCols.length; i++) {
110:
111:                    l.add(Integer.valueOf(yCols[i]));
112:
113:                }
114:
115:                this .define(xCol, l);
116:
117:            }
118:
119:            public void define(int xCol, List yCols)
120:                    throws IllegalArgumentException, IllegalStateException,
121:                    QueryParseException {
122:
123:                if (!this .parsed()) {
124:
125:                    throw new IllegalStateException(
126:                            "Cannot add a series until a query has been specified and parsed.");
127:
128:                }
129:
130:                if (xCol < 1) {
131:
132:                    throw new IllegalArgumentException(
133:                            "X column index must be a minimum of 1.");
134:
135:                }
136:
137:                for (int i = 0; i < yCols.size(); i++) {
138:
139:                    Object o = yCols.get(i);
140:
141:                    if (o instanceof  String) {
142:
143:                        try {
144:
145:                            yCols.set(i, Integer.valueOf((String) o));
146:
147:                            continue;
148:
149:                        } catch (Exception e) {
150:
151:                            throw new IllegalArgumentException(
152:                                    "Unable to convert y column indicator: "
153:                                            + o + " to an integer.");
154:
155:                        }
156:
157:                    }
158:
159:                    if (o instanceof  Number) {
160:
161:                        yCols.set(i, Integer.valueOf(((Number) o).intValue()));
162:
163:                        continue;
164:
165:                    }
166:
167:                    if (!(o instanceof  Integer)) {
168:
169:                        throw new IllegalArgumentException(
170:                                "Expected y column indicator: "
171:                                        + o
172:                                        + " to be either a number or a string representing a number.");
173:
174:                    }
175:
176:                }
177:
178:                List cols = this .getColumns();
179:
180:                for (int i = 0; i < yCols.size(); i++) {
181:
182:                    Integer in = (Integer) yCols.get(i);
183:
184:                    if (in.intValue() < 1) {
185:
186:                        throw new IllegalArgumentException(
187:                                "Y column index must be a minimum of 1.");
188:
189:                    }
190:
191:                    if (in.intValue() > cols.size()) {
192:
193:                        throw new IllegalArgumentException(
194:                                "Y column index must be a maximum of "
195:                                        + cols.size() + ".");
196:
197:                    }
198:
199:                    SelectItemExpression yexp = (SelectItemExpression) cols
200:                            .get(in.intValue() - 1);
201:
202:                    if (yexp.getAlias() == null) {
203:
204:                        throw new IllegalArgumentException("Y column: " + yexp
205:                                + " must have an alias.");
206:
207:                    }
208:
209:                    Class yc = yexp.getExpectedReturnType(this );
210:
211:                    if (!Utilities.isNumber(yc)) {
212:
213:                        throw new IllegalArgumentException(
214:                                "Y column: "
215:                                        + yexp
216:                                        + " will evaluate to an instance of type: "
217:                                        + yc.getName()
218:                                        + ", but only columns that return numbers are allowed.");
219:
220:                    }
221:
222:                }
223:
224:                if (xCol > cols.size()) {
225:
226:                    throw new IllegalArgumentException(
227:                            "X column index must be a maximum of "
228:                                    + cols.size() + ".");
229:
230:                }
231:
232:                SelectItemExpression xexp = (SelectItemExpression) cols
233:                        .get(xCol - 1);
234:
235:                Class xc = xexp.getExpectedReturnType(this );
236:
237:                xc = Utilities.getObjectClass(xc);
238:
239:                if (!(Comparable.class.isAssignableFrom(xc))) {
240:
241:                    throw new IllegalArgumentException("X column: " + xexp
242:                            + " will evaluate to an instance of type: "
243:                            + xc.getName()
244:                            + ", but only columns that implement: "
245:                            + Comparable.class.getName() + " can be used.");
246:
247:                }
248:
249:                this .yCols = yCols;
250:
251:            }
252:
253:            /**
254:             * Exectute the query and return the results.  A reference to the results is also held to 
255:             * allow them to be iterated over.  If you plan on re-using this data source then 
256:             * you should call: {@link #clearResults()} to free up the references to the results.
257:             *
258:             * @param l The List of objects to execute the query on.
259:             * @return The results.
260:             * @throws QueryExecutionException If the query cannot be executed, or if the query
261:             *                                 is set to return objects rather than "columns".
262:             */
263:            public QueryResults executeQuery(List l)
264:                    throws QueryExecutionException {
265:
266:                if (this .isWantObjects()) {
267:
268:                    throw new QueryExecutionException(
269:                            "Only SQL statements that return columns (not the objects passed in) can be used.");
270:
271:                }
272:
273:                this .results = super .execute(l);
274:
275:                // Notify our listeners.
276:                DatasetChangeEvent dce = new DatasetChangeEvent(this , this );
277:
278:                for (int i = 0; i < this .listeners.size(); i++) {
279:
280:                    DatasetChangeListener d = (DatasetChangeListener) this .listeners
281:                            .get(i);
282:
283:                    d.datasetChanged(dce);
284:
285:                }
286:
287:                return this .results;
288:
289:            }
290:
291:            public DomainOrder getDomainOrder() {
292:
293:                return DomainOrder.ASCENDING;
294:
295:            }
296:
297:            public int getRowCount() {
298:
299:                return this .results.getResults().size();
300:
301:            }
302:
303:            public int getColumnCount() {
304:
305:                return this .yCols.size();
306:
307:            }
308:
309:            public Number getValue(int row, int col) {
310:
311:                List l = (List) this .results.getResults().get(row);
312:
313:                return (Number) l.get(col);
314:
315:            }
316:
317:            public List getRowKeys() {
318:
319:                List ks = new ArrayList();
320:
321:                for (int i = 0; i < this .results.getResults().size(); i++) {
322:
323:                    List l = (List) this .results.getResults().get(i);
324:
325:                    ks.add(l.get(this .xCol));
326:
327:                }
328:
329:                return ks;
330:
331:            }
332:
333:            public Number getValue(Comparable row, Comparable col) {
334:
335:                int rk = this .getRowIndex(row);
336:                int ck = this .getColumnIndex(col);
337:
338:                List l = (List) this .results.getResults().get(rk);
339:
340:                return (Number) l.get(ck);
341:
342:            }
343:
344:            public Comparable getColumnKey(int c) {
345:
346:                return (Comparable) this .getColumnKeys().get(c);
347:
348:            }
349:
350:            public List getColumnKeys() {
351:
352:                List ks = new ArrayList();
353:
354:                for (int i = 0; i < this .yCols.size(); i++) {
355:
356:                    Integer in = (Integer) this .yCols.get(i);
357:
358:                    SelectItemExpression sei = (SelectItemExpression) this 
359:                            .getColumns().get(in.intValue() - 1);
360:
361:                    ks.add(sei.getAlias());
362:
363:                }
364:
365:                return ks;
366:
367:            }
368:
369:            public int getColumnIndex(Comparable c) {
370:
371:                List ck = this .getColumnKeys();
372:
373:                for (int i = 0; i < ck.size(); i++) {
374:
375:                    if (((Comparable) ck.get(i)).compareTo(c) == 0) {
376:
377:                        return i;
378:
379:                    }
380:
381:                }
382:
383:                return -1;
384:
385:            }
386:
387:            public int getRowIndex(Comparable c) {
388:
389:                List rk = this .getRowKeys();
390:
391:                for (int i = 0; i < rk.size(); i++) {
392:
393:                    if (((Comparable) rk.get(i)).compareTo(c) == 0) {
394:
395:                        return i;
396:
397:                    }
398:
399:                }
400:
401:                return -1;
402:
403:            }
404:
405:            public Comparable getRowKey(int k) {
406:
407:                return (Comparable) this.getRowKeys().get(k);
408:
409:            }
410:
411:        }
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