Source Code Cross Referenced for TransformationImpl.java in  » ESB » open-esb » com » sun » jbi » engine » xslt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » ESB » open esb » com.sun.jbi.engine.xslt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * BEGIN_HEADER - DO NOT EDIT
003:         *
004:         * The contents of this file are subject to the terms
005:         * of the Common Development and Distribution License
006:         * (the "License").  You may not use this file except
007:         * in compliance with the License.
008:         *
009:         * You can obtain a copy of the license at
010:         * https://open-esb.dev.java.net/public/CDDLv1.0.html.
011:         * See the License for the specific language governing
012:         * permissions and limitations under the License.
013:         *
014:         * When distributing Covered Code, include this CDDL
015:         * HEADER in each file and include the License file at
016:         * https://open-esb.dev.java.net/public/CDDLv1.0.html.
017:         * If applicable add the following below this CDDL HEADER,
018:         * with the fields enclosed by brackets "[]" replaced with
019:         * your own identifying information: Portions Copyright
020:         * [year] [name of copyright owner]
021:         */
022:
023:        /*
024:         * @(#)TransformationImpl.java
025:         * Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved.
026:         *
027:         * END_HEADER - DO NOT EDIT
028:         */
029:        package com.sun.jbi.engine.xslt;
030:
031:        import com.sun.jbi.engine.xslt.framework.WorkManager;
032:        import com.sun.jbi.engine.xslt.util.StringTranslator;
033:
034:        import org.w3c.dom.Document;
035:        import org.w3c.dom.Element;
036:        import org.w3c.dom.Node;
037:
038:        import java.util.EmptyStackException;
039:        import java.util.Properties;
040:        import java.util.Stack;
041:        import java.util.logging.Logger;
042:
043:        import javax.xml.transform.OutputKeys;
044:        import javax.xml.transform.Result;
045:        import javax.xml.transform.Source;
046:        import javax.xml.transform.Templates;
047:        import javax.xml.transform.Transformer;
048:        import javax.xml.transform.TransformerFactory;
049:        import javax.xml.transform.stream.StreamSource;
050:
051:        /**
052:         * This class provides interfaces to process the messages received by the
053:         * QuoteService implementations. It also contains interfaces to create the
054:         * outbound response and fault message.
055:         *
056:         * @author Sun Microsystems, Inc.
057:         */
058:        public final class TransformationImpl implements 
059:                TransformationProcessor, TEResources {
060:            /**
061:             *    
062:             */
063:            private static StringTranslator sTranslator = new StringTranslator(
064:                    "com.sun.jbi.engine.xslt", null);
065:
066:            /**
067:             *    
068:             */
069:            private static Stack sPool = new Stack();
070:
071:            /**
072:             *    
073:             */
074:            private static TemplateRegistry sTemplateRegistry = TemplateRegistry
075:                    .getRegistry();
076:
077:            /**
078:             *    
079:             */
080:            private static Logger sLogger = TransformationEngineContext
081:                    .getInstance().getLogger("");
082:
083:            /**
084:             *    
085:             */
086:            private Properties mCache = null;
087:
088:            /**
089:             *    
090:             */
091:            private String mTemplateKey = null;
092:
093:            /**
094:             *    
095:             */
096:            private WorkManager mWorkManager = null;
097:
098:            /**
099:             *    
100:             */
101:            private int mCount = 0;
102:
103:            /**
104:             * Creates a new instance of TransformationImpl.
105:             *
106:             * @param count number of Factory instances
107:             */
108:            public TransformationImpl(int count) {
109:                init(count);
110:            }
111:
112:            /**
113:             * DOCUMENT ME!
114:             *
115:             * @return NOT YET DOCUMENTED
116:             */
117:            public static synchronized TransformerFactory getTransformerFactory() {
118:                TransformerFactory tFactory = null;
119:
120:                try {
121:                    tFactory = (TransformerFactory) sPool.pop();
122:                } catch (EmptyStackException ex) {
123:                    sLogger.warning(sTranslator
124:                            .getString(TEResources.NO_TRANSFORMATIONIMPL));
125:                }
126:
127:                return tFactory;
128:            }
129:
130:            /**
131:             * DOCUMENT ME!
132:             *
133:             * @param tfactory NOT YET DOCUMENTED
134:             */
135:            public static synchronized void putTransformerFactory(
136:                    TransformerFactory tfactory) {
137:                Object obj = sPool.push(tfactory);
138:
139:                if (obj == null) {
140:                    sLogger
141:                            .warning(sTranslator
142:                                    .getString(TEResources.PUSHING_TRANSFORMATIONIMPL_FAILED));
143:                }
144:            }
145:
146:            /**
147:             * DOCUMENT ME!
148:             *
149:             * @param template NOT YET DOCUMENTED
150:             */
151:            public void setTemplateName(String template) {
152:                mTemplateKey = template;
153:            }
154:
155:            /**
156:             * DOCUMENT ME!
157:             *
158:             * @return NOT YET DOCUMENTED
159:             */
160:            public String getTemplateName() {
161:                return mTemplateKey;
162:            }
163:
164:            /**
165:             * Generates a fault message.
166:             *
167:             * @param document - a DOM object which will contain the fault message.
168:             * @param input - the stock symbol name.
169:             * @param message - error message.
170:             */
171:            public void createFaultMessage(Document document, Node input,
172:                    String message) {
173:                sLogger.info(sTranslator
174:                        .getString(TEResources.CREATEFAULTMESSAGE_START));
175:
176:                Element transformElement = document.createElement(sTranslator
177:                        .getString(TEResources.TRANSFORM));
178:                Element faultElement = document.createElement(sTranslator
179:                        .getString(TEResources.FAULT));
180:                Element messageElement = document.createElement(sTranslator
181:                        .getString(TEResources.MESSAGE));
182:                messageElement.appendChild(document.createTextNode(message));
183:                faultElement.appendChild(messageElement);
184:                transformElement.appendChild(faultElement);
185:                document.appendChild(transformElement);
186:            }
187:
188:            /**
189:             * Generates a response message.
190:             *
191:             * @param document - a DOM object which will contain the response message.
192:             * @param response - the stock symbol name.
193:             *
194:             * @throws Exception exception
195:             */
196:            public void createResponseMesage(Document document, Node response)
197:                    throws Exception {
198:                Element transformElement = document.createElement(sTranslator
199:                        .getString(TEResources.TRANSFORM));
200:                Element responseElement = document.createElement(sTranslator
201:                        .getString(TEResources.RESPONSE));
202:                responseElement.appendChild(response);
203:                transformElement.appendChild(responseElement);
204:                document.appendChild(transformElement);
205:            }
206:
207:            /**
208:             * Does transformation on the input DOM object using the stylesheet.
209:             *
210:             * @param input - a DOM object containing the message request.
211:             * @param xsltfile - XSLT Tranformation stylesheet
212:             * @param result - Result of the XSLT transformation
213:             *
214:             * @return the symbol if the message conforms to the format; otherwise
215:             *         null.
216:             *
217:             * @throws Exception exception
218:             */
219:            public boolean doTransform(Source input, String xsltfile,
220:                    Result result) throws Exception {
221:                boolean status = false;
222:                TransformerFactory tFactory = null;
223:                Transformer transformer = null;
224:
225:                //Check template registry for the xsltfile
226:                Templates tpl = (Templates) sTemplateRegistry.get(mTemplateKey);
227:                int mSomeNumber = 19;
228:
229:                try {
230:                    if (tpl != null) {
231:                        transformer = tpl.newTransformer();
232:                    } else {
233:                        try {
234:                            int attempt = 0;
235:
236:                            while ((tFactory == null)
237:                                    && (attempt < mSomeNumber)) {
238:                                tFactory = getTransformerFactory();
239:
240:                                if (tFactory == null) {
241:                                    sLogger
242:                                            .severe(sTranslator
243:                                                    .getString(TEResources.CACHED_TRANSFORMERFACTORY_NOT_PRESENT));
244:                                    attempt++;
245:
246:                                    // wait for some time
247:                                }
248:                            }
249:
250:                            // Temproary fix  
251:                            if (tFactory == null) {
252:                                tFactory = TransformerFactory.newInstance();
253:                            }
254:
255:                            if (xsltfile != null) {
256:                                StreamSource stylesheet = new StreamSource(
257:                                        xsltfile);
258:                                transformer = tFactory
259:                                        .newTransformer(stylesheet);
260:                                transformer.setOutputProperty(
261:                                        OutputKeys.OMIT_XML_DECLARATION, "yes");
262:                            }
263:                        } finally {
264:                            //Returning the tFactory to pool
265:                            if (sPool.size() < mCount) {
266:                                putTransformerFactory(tFactory);
267:                            }
268:                        }
269:
270:                        TemplateCommand command = new TemplateCommand(
271:                                mTemplateKey, new StreamSource(xsltfile));
272:
273:                        while (!mWorkManager.processCommand(command)) {
274:                            //block till template is done
275:                        }
276:                    }
277:
278:                    transformer.transform(input, result);
279:                    status = true;
280:                } catch (Exception ex) {
281:                    sLogger.severe(sTranslator
282:                            .getString(TEResources.TRANSFORMATION_FAILED));
283:                    throw ex;
284:                }
285:
286:                return status;
287:            }
288:
289:            /**
290:             * Does transformation on the input DOM object using the stylesheet.
291:             *
292:             * @param input - a DOM object containing the message request.
293:             * @param result - Result of Transformation
294:             *
295:             * @return the symbol if the message conforms to the format; otherwise
296:             *         null.
297:             *
298:             * @throws Exception exception
299:             */
300:            public boolean transform(Source input, Result result)
301:                    throws Exception {
302:                return doTransform(input, "/temp.xsl", result);
303:            }
304:
305:            /**
306:             * Initializes the instance.
307:             *
308:             * @param num - number of Factory instances
309:             */
310:            private void init(int num) {
311:                mWorkManager = WorkManager.getWorkManager(sTranslator
312:                        .getString(TEResources.XSLT));
313:                mCount = num;
314:
315:                /* Commenting out the following as JAXP will be able to detect
316:                   the provider for the underlying platform 
317:
318:                String key = "javax.xml.transform.TransformerFactory";
319:
320:                //String value = "org.apache.xalan.xsltc.trax.SmartTransformerFactoryImpl";
321:                //String value = "org.apache.xalan.processor.TransformerFactoryImpl";
322:                String value = "com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl";
323:                mCache = System.getProperties();
324:                mCache.put(key, value);
325:                System.setProperties(mCache); */
326:
327:                for (int i = 0; i < mCount; i++) {
328:                    TransformerFactory tFactory = TransformerFactory
329:                            .newInstance();
330:                    putTransformerFactory(tFactory);
331:                }
332:            }
333:        }
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