Source Code Cross Referenced for JoSQLFreeChartPieDataset.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.Map;
020:        import java.util.LinkedHashMap;
021:        import java.util.Iterator;
022:
023:        import org.jfree.data.general.PieDataset;
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 JoSQLFreeChartPieDataset extends Query implements 
039:                PieDataset {
040:
041:            private Map values = new LinkedHashMap();
042:            private int key = 0;
043:            private int value = 0;
044:            private List listeners = new ArrayList();
045:            private DatasetGroup group = null;
046:
047:            public JoSQLFreeChartPieDataset() {
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:            public void setGroup(DatasetGroup g) {
070:
071:                this .group = g;
072:
073:            }
074:
075:            public void setKeyValue(int keyCol, int valueCol)
076:                    throws IllegalArgumentException, IllegalStateException,
077:                    QueryParseException {
078:
079:                if (!this .parsed()) {
080:
081:                    throw new IllegalStateException(
082:                            "Cannot specify the key and value columns until a query has been specified and parsed.");
083:
084:                }
085:
086:                if (keyCol < 1) {
087:
088:                    throw new IllegalArgumentException(
089:                            "Key column index must be a minimum of 1.");
090:
091:                }
092:
093:                if (valueCol < 1) {
094:
095:                    throw new IllegalArgumentException(
096:                            "Value column index must be a minimum of 1.");
097:
098:                }
099:
100:                List cols = this .getColumns();
101:
102:                if (keyCol > cols.size()) {
103:
104:                    throw new IllegalArgumentException(
105:                            "Key column index must be a minimum of "
106:                                    + cols.size() + ".");
107:
108:                }
109:
110:                if (valueCol > cols.size()) {
111:
112:                    throw new IllegalArgumentException(
113:                            "Value column index must be a minimum of "
114:                                    + cols.size() + ".");
115:
116:                }
117:
118:                SelectItemExpression vexp = (SelectItemExpression) cols
119:                        .get(valueCol - 1);
120:
121:                Class vc = vexp.getExpectedReturnType(this );
122:
123:                if (!Utilities.isNumber(vc)) {
124:
125:                    throw new IllegalArgumentException(
126:                            "Value column: "
127:                                    + valueCol
128:                                    + " will evaluate to an instance of type: "
129:                                    + vc.getName()
130:                                    + ", but only columns that return numbers are allowed.");
131:
132:                }
133:
134:                this .key = keyCol;
135:                this .value = valueCol;
136:
137:            }
138:
139:            /**
140:             * Exectute the query and return the results.  A reference to the results is also held to 
141:             * allow them to be iterated over.  If you plan on re-using this data source then 
142:             * you should call: {@link #clearResults()} to free up the references to the results.
143:             *
144:             * @param l The List of objects to execute the query on.
145:             * @return The results.
146:             * @throws QueryExecutionException If the query cannot be executed, or if the query
147:             *                                 is set to return objects rather than "columns".
148:             */
149:            public QueryResults executeQuery(List l)
150:                    throws QueryExecutionException {
151:
152:                if (this .isWantObjects()) {
153:
154:                    throw new QueryExecutionException(
155:                            "Only SQL statements that return columns (not the objects passed in) can be used.");
156:
157:                }
158:
159:                if ((this .key == 0) || (this .value == 0)) {
160:
161:                    throw new IllegalStateException(
162:                            "Key and/or value columns not specified.");
163:
164:                }
165:
166:                QueryResults qr = super .execute(l);
167:
168:                List res = qr.getResults();
169:
170:                Map nValues = new LinkedHashMap();
171:
172:                for (int i = 0; i < res.size(); i++) {
173:
174:                    List resR = (List) res.get(i);
175:
176:                    // Get the key.
177:                    Object k = resR.get(this .key - 1);
178:
179:                    // Get the value.
180:                    Object v = resR.get(this .value - 1);
181:
182:                    String kv = null + "";
183:
184:                    if (k == null) {
185:
186:                        nValues.put(kv, v);
187:
188:                    }
189:
190:                    // See if the key is "comparable".
191:                    if (k instanceof  Comparable) {
192:
193:                        nValues.put(k, v);
194:
195:                    } else {
196:
197:                        kv = k.toString();
198:
199:                        nValues.put(kv, v);
200:
201:                    }
202:
203:                }
204:
205:                // Just switch them, this way enables any client of the data to
206:                // still iterate over them without fear of a ConcurrentModificationException
207:                // occuring.
208:                this .values = nValues;
209:
210:                // Notify our listeners.
211:                DatasetChangeEvent dce = new DatasetChangeEvent(this , this );
212:
213:                for (int i = 0; i < this .listeners.size(); i++) {
214:
215:                    DatasetChangeListener d = (DatasetChangeListener) this .listeners
216:                            .get(i);
217:
218:                    d.datasetChanged(dce);
219:
220:                }
221:
222:                return qr;
223:
224:            }
225:
226:            public int getItemCount() {
227:
228:                return this .values.size();
229:
230:            }
231:
232:            public Number getValue(int index) {
233:
234:                int c = 0;
235:
236:                Iterator iter = this .values.keySet().iterator();
237:
238:                while (iter.hasNext()) {
239:
240:                    Object k = iter.next();
241:
242:                    if (index == c) {
243:
244:                        return (Number) this .values.get(k);
245:
246:                    }
247:
248:                    c++;
249:
250:                }
251:
252:                return new Double(-1);
253:
254:            }
255:
256:            public int getIndex(Comparable k) {
257:
258:                int c = 0;
259:
260:                Iterator iter = this .values.keySet().iterator();
261:
262:                while (iter.hasNext()) {
263:
264:                    Comparable ko = (Comparable) iter.next();
265:
266:                    if (ko.compareTo(k) == 0) {
267:
268:                        return c;
269:
270:                    }
271:
272:                    c++;
273:
274:                }
275:
276:                return -1;
277:
278:            }
279:
280:            public Comparable getKey(int index) {
281:
282:                int c = 0;
283:
284:                Iterator iter = this .values.keySet().iterator();
285:
286:                while (iter.hasNext()) {
287:
288:                    Object k = iter.next();
289:
290:                    if (index == c) {
291:
292:                        return (Comparable) k;
293:
294:                    }
295:
296:                    c++;
297:
298:                }
299:
300:                return null;
301:
302:            }
303:
304:            public Number getValue(Comparable key) {
305:
306:                return (Number) this .values.get(key);
307:
308:            }
309:
310:            public List getKeys() {
311:
312:                return new ArrayList(this.values.keySet());
313:
314:            }
315:
316:        }
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