Source Code Cross Referenced for Datasources.java in  » Web-Framework » rife-1.6.1 » com » uwyn » rife » database » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » rife 1.6.1 » com.uwyn.rife.database 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2001-2007 Geert Bevin <gbevin[remove] at uwyn dot com>
003:         * Distributed under the terms of either:
004:         * - the common development and distribution license (CDDL), v1.0; or
005:         * - the GNU Lesser General Public License, v2.1 or later
006:         * $Id: Datasources.java 3634 2007-01-08 21:42:24Z gbevin $
007:         */
008:        package com.uwyn.rife.database;
009:
010:        import com.uwyn.rife.database.exceptions.*;
011:
012:        import com.uwyn.rife.rep.Participant;
013:        import com.uwyn.rife.rep.Rep;
014:        import com.uwyn.rife.resources.ResourceFinder;
015:        import com.uwyn.rife.selector.XmlSelectorResolver;
016:        import com.uwyn.rife.tools.FileUtils;
017:        import com.uwyn.rife.tools.SortListComparables;
018:        import com.uwyn.rife.tools.StringUtils;
019:        import com.uwyn.rife.tools.exceptions.FileUtilsErrorException;
020:        import com.uwyn.rife.xml.exceptions.XmlErrorException;
021:        import java.io.File;
022:        import java.net.URL;
023:        import java.net.URLDecoder;
024:        import java.util.ArrayList;
025:        import java.util.Collection;
026:        import java.util.HashMap;
027:
028:        /**
029:         * Contains a collection of <code>Datasource</code> instances that have been
030:         * created from an XML definition. A <code>Datasources</code> instance can
031:         * either be created by calling the public constructor or by executing the
032:         * <code>ParticipantDatasources</code> which participates in the
033:         * application-wide repository.
034:         *
035:         * @author Geert Bevin (gbevin[remove] at uwyn dot com)
036:         * @version $Revision: 3634 $
037:         * @see com.uwyn.rife.database.Datasource
038:         * @see com.uwyn.rife.database.Xml2Datasources
039:         * @see com.uwyn.rife.rep.Rep
040:         * @see com.uwyn.rife.rep.participants.ParticipantDatasources
041:         * @since 1.0
042:         */
043:        public class Datasources {
044:            public static final String DEFAULT_PARTICIPANT_NAME = "ParticipantDatasources";
045:
046:            private HashMap<String, Datasource> mDatasources = null;
047:            private String mXmlPath = null;
048:            private ResourceFinder mResourceFinder = null;
049:
050:            /**
051:             * Creates a new empty <code>Datasources</code> instance.
052:             *
053:             * @since 1.0
054:             */
055:            public Datasources() throws DatasourcesException {
056:                mDatasources = new HashMap<String, Datasource>();
057:            }
058:
059:            /**
060:             * Creates a new <code>Datasources</code> instance from the definitions in
061:             * an XML file.
062:             *
063:             * @param xmlPath the path of the XML resource that will be used for the
064:             * population
065:             * @param resourceFinder a <code>ResourceFinder</code> instance that will be
066:             * used to find the file that corresponds to the provided
067:             * <code>xmlPath</code>
068:             *
069:             * @throws DatasourcesException when an exception occured during the
070:             * obtainance of the resource's modification time or during the processing
071:             * of the XML file
072:             *
073:             * @since 1.0
074:             */
075:            public Datasources(String xmlPath, ResourceFinder resourceFinder)
076:                    throws DatasourcesException, DatasourceNotFoundException {
077:                if (null == xmlPath)
078:                    throw new IllegalArgumentException("xmlPath can't be null.");
079:                if (0 == xmlPath.length())
080:                    throw new IllegalArgumentException(
081:                            "xmlPath can't be empty.");
082:                if (null == resourceFinder)
083:                    throw new IllegalArgumentException(
084:                            "resourceFinder can't be null.");
085:
086:                mResourceFinder = resourceFinder;
087:
088:                String datasource_resolved = XmlSelectorResolver.resolve(
089:                        xmlPath, mResourceFinder, "rep/datasources-");
090:                if (null == datasource_resolved) {
091:                    throw new DatasourceNotFoundException(xmlPath);
092:                }
093:
094:                URL datasource_resource = mResourceFinder
095:                        .getResource(datasource_resolved);
096:                if (null == datasource_resource) {
097:                    throw new DatasourceNotFoundException(xmlPath,
098:                            datasource_resolved);
099:                }
100:
101:                mXmlPath = datasource_resolved;
102:
103:                initialize();
104:
105:                assert mResourceFinder != null;
106:                assert mXmlPath != null;
107:                assert mXmlPath.length() > 0;
108:            }
109:
110:            /**
111:             * Checks if a <code>ParticipantDatasources</code> participant has been
112:             * initialized and is available from the application-wide repository.
113:             *
114:             * @return <code>true</code> if this participant is available; or
115:             * <p>
116:             * <code>false</code> otherwise
117:             *
118:             * @see #getRepInstance()
119:             *
120:             * @since 1.0
121:             */
122:            public static boolean hasRepInstance() {
123:                return Rep.hasParticipant(DEFAULT_PARTICIPANT_NAME);
124:            }
125:
126:            /**
127:             * Retrieves the <code>Datasources</code> instance that is initialized by
128:             * the <code>ParticipantDatasources</code> participant in the
129:             * application-wide repository.
130:             *
131:             * @return the requested <code>Datasources</code> instances; or
132:             * <p>
133:             * <code>null</code> if the <code>ParticipantDatasources</code> couldn't be
134:             * found
135:             *
136:             * @see #hasRepInstance()
137:             *
138:             * @since 1.0
139:             */
140:            public static Datasources getRepInstance() {
141:                Participant participant = Rep
142:                        .getParticipant(DEFAULT_PARTICIPANT_NAME);
143:                if (null == participant) {
144:                    return null;
145:                }
146:
147:                return (Datasources) participant.getObject();
148:            }
149:
150:            /**
151:             * Retrieves the <code>Datasource</code> that corresponds to a provided
152:             * name.
153:             *
154:             * @param name a <code>String</code> that identifies the
155:             * <code>Datasource</code> that has to be retrieved
156:             *
157:             * @return the requested <code>Datasource</code> instance; or
158:             * <p>
159:             * <code>null</code> if name isn't known
160:             *
161:             * @since 1.0
162:             */
163:            public Datasource getDatasource(String name) {
164:                return mDatasources.get(name);
165:            }
166:
167:            /**
168:             * Stores a <code>Datasource</code> with a provided name to be able to
169:             * reference it later.
170:             *
171:             * @param name a <code>String</code> that identifies the
172:             * <code>Datasource</code>
173:             * @param datasource the <code>Datasource</code> instance that has to be
174:             * stored
175:             *
176:             * @since 1.0
177:             */
178:            public void setDatasource(String name, Datasource datasource) {
179:                if (null == name)
180:                    throw new IllegalArgumentException("name can't be null.");
181:                if (0 == name.length())
182:                    throw new IllegalArgumentException("name can't be empty.");
183:                if (null == datasource)
184:                    throw new IllegalArgumentException(
185:                            "datasource can't be null.");
186:
187:                mDatasources.put(name, datasource);
188:            }
189:
190:            /**
191:             * Retrieves a collection of all the <code>Datasource</code> names that are
192:             * known by this <code>Datasources</code> instance.
193:             *
194:             * @return the requested <code>Collection</code>
195:             *
196:             * @since 1.0
197:             */
198:            public Collection<String> getDatasourceNames() {
199:                return mDatasources.keySet();
200:            }
201:
202:            /**
203:             * Retrieves the path of the XML document that populated this
204:             * <code>DataSources</code> instance
205:             *
206:             * @return the path of the XML document that populated this
207:             * <code>DataSources</code> instance
208:             *
209:             * @since 1.0
210:             */
211:            public String getXmlPath() {
212:                return mXmlPath;
213:            }
214:
215:            /**
216:             * Creates an XML document with all the data in the current
217:             * <code>Datasources</code> instance
218:             *
219:             * @return the constructed XML document as a <code>String</code>
220:             *
221:             * @since 1.0
222:             */
223:            public String toXml() {
224:                StringBuilder xml_output = new StringBuilder();
225:
226:                xml_output.append("<datasources>\n");
227:
228:                ArrayList<String> datasource_keys_arraylist = new ArrayList<String>();
229:                for (String datasource_key : mDatasources.keySet()) {
230:                    datasource_keys_arraylist.add(datasource_key);
231:                }
232:
233:                (new SortListComparables()).sort(datasource_keys_arraylist);
234:
235:                Datasource datasource = null;
236:                for (String datasource_key : datasource_keys_arraylist) {
237:                    datasource = mDatasources.get(datasource_key);
238:
239:                    xml_output.append("\t<datasource name=\"").append(
240:                            StringUtils.encodeXml(datasource_key)).append(
241:                            "\">\n");
242:                    xml_output.append("\t\t<driver>").append(
243:                            StringUtils.encodeXml(datasource.getDriver()))
244:                            .append("</driver>\n");
245:                    xml_output.append("\t\t<url>").append(
246:                            StringUtils.encodeXml(datasource.getUrl())).append(
247:                            "</url>\n");
248:                    if (null != datasource.getUser()) {
249:                        xml_output.append("\t\t<user>").append(
250:                                StringUtils.encodeXml(datasource.getUser()))
251:                                .append("</user>\n");
252:                    }
253:                    if (null != datasource.getPassword()) {
254:                        xml_output.append("\t\t<password>")
255:                                .append(
256:                                        StringUtils.encodeXml(datasource
257:                                                .getPassword())).append(
258:                                        "</password>\n");
259:                    }
260:                    if (datasource.getPoolsize() > 0) {
261:                        xml_output.append("\t\t<poolsize>").append(
262:                                datasource.getPoolsize()).append(
263:                                "</poolsize>\n");
264:                    }
265:                    xml_output.append("\t</datasource>\n");
266:                }
267:
268:                xml_output.append("</datasources>\n");
269:
270:                assert xml_output.length() > 0;
271:
272:                return xml_output.toString();
273:            }
274:
275:            /**
276:             * Performs the initialization logic.
277:             *
278:             * @throws DatasourcesException when an error occurred during the
279:             * initialization
280:             *
281:             * @since 1.0
282:             */
283:            private void initialize() throws DatasourcesException {
284:                try {
285:                    Xml2Datasources xml_datasources = new Xml2Datasources();
286:                    xml_datasources.processXml(mXmlPath, mResourceFinder);
287:                    synchronized (this ) {
288:                        mDatasources = xml_datasources.getDatasources();
289:                    }
290:                } catch (XmlErrorException e) {
291:                    throw new InitializationErrorException(mXmlPath, e);
292:                }
293:
294:                assert mDatasources != null;
295:            }
296:
297:            /**
298:             * Stores the XML document with all the data in the current
299:             * <code>Datasources</code> instance to the same file that populated
300:             * this instance.
301:             *
302:             * @throws DatasourcesException when an error occurred during the
303:             * storage
304:             *
305:             * @since 1.0
306:             */
307:            public void storeToXml() throws DatasourcesException {
308:                String xmlpath = null;
309:                URL xmlpath_resource = null;
310:
311:                xmlpath = getXmlPath();
312:                if (null == xmlpath) {
313:                    throw new MissingXmlPathException();
314:                }
315:
316:                xmlpath_resource = mResourceFinder.getResource(xmlpath);
317:                if (null == xmlpath_resource) {
318:                    throw new CantFindXmlPathException(xmlpath);
319:                }
320:
321:                storeToXml(new File(URLDecoder.decode(xmlpath_resource
322:                        .getPath())));
323:            }
324:
325:            /**
326:             * Stores the XML document with all the data in the current
327:             * <code>Datasources</code> instance to the provided file.
328:             *
329:             * @param destination the <code>File</code> in which the data will be stored
330:            
331:             * @throws DatasourcesException when an error occurred during the
332:             * storage
333:             */
334:            public synchronized void storeToXml(File destination)
335:                    throws DatasourcesException {
336:                if (null == destination)
337:                    throw new IllegalArgumentException(
338:                            "destination can't be null");
339:
340:                if (destination.exists() && !destination.canWrite()) {
341:                    throw new CantWriteToDestinationException(destination);
342:                }
343:
344:                StringBuilder content = new StringBuilder(
345:                        "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n");
346:                content
347:                        .append("<!DOCTYPE datasources SYSTEM \"/dtd/datasources.dtd\">\n");
348:                content.append(toXml());
349:                try {
350:                    FileUtils.writeString(content.toString(), destination);
351:                } catch (FileUtilsErrorException e) {
352:                    throw new StoreXmlErrorException(destination, e);
353:                }
354:            }
355:
356:            /**
357:             * Cleans up all connections that have been reserved by this datasource.
358:             *
359:             * @throws DatabaseException when an error occured during the cleanup
360:             *
361:             * @since 1.0
362:             */
363:            public void cleanup() throws DatabaseException {
364:                synchronized (this ) {
365:                    if (null == mDatasources) {
366:                        return;
367:                    }
368:
369:                    HashMap<String, Datasource> datasoures = mDatasources;
370:                    mDatasources = null;
371:
372:                    for (Datasource datasource : datasoures.values()) {
373:                        datasource.cleanup();
374:                    }
375:                }
376:            }
377:        }
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