Source Code Cross Referenced for TurbineXSLTService.java in  » Web-Framework » TURBINE » org » apache » turbine » services » xslt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » TURBINE » org.apache.turbine.services.xslt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package org.apache.turbine.services.xslt;
002:
003:        /*
004:         * Licensed to the Apache Software Foundation (ASF) under one
005:         * or more contributor license agreements.  See the NOTICE file
006:         * distributed with this work for additional information
007:         * regarding copyright ownership.  The ASF licenses this file
008:         * to you under the Apache License, Version 2.0 (the
009:         * "License"); you may not use this file except in compliance
010:         * with the License.  You may obtain a copy of the License at
011:         *
012:         *   http://www.apache.org/licenses/LICENSE-2.0
013:         *
014:         * Unless required by applicable law or agreed to in writing,
015:         * software distributed under the License is distributed on an
016:         * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017:         * KIND, either express or implied.  See the License for the
018:         * specific language governing permissions and limitations
019:         * under the License.
020:         */
021:
022:        import java.io.IOException;
023:        import java.io.InputStream;
024:        import java.io.Reader;
025:        import java.io.StringWriter;
026:        import java.io.Writer;
027:        import java.net.URL;
028:        import java.util.Iterator;
029:        import java.util.Map;
030:
031:        import javax.xml.transform.Result;
032:        import javax.xml.transform.Source;
033:        import javax.xml.transform.Templates;
034:        import javax.xml.transform.Transformer;
035:        import javax.xml.transform.TransformerException;
036:        import javax.xml.transform.TransformerFactory;
037:        import javax.xml.transform.dom.DOMSource;
038:        import javax.xml.transform.stream.StreamResult;
039:        import javax.xml.transform.stream.StreamSource;
040:
041:        import org.apache.commons.collections.map.LRUMap;
042:        import org.apache.commons.configuration.Configuration;
043:        import org.apache.commons.lang.StringUtils;
044:        import org.apache.turbine.services.InitializationException;
045:        import org.apache.turbine.services.TurbineBaseService;
046:        import org.apache.turbine.services.servlet.TurbineServlet;
047:        import org.w3c.dom.Node;
048:
049:        /**
050:         * Implementation of the Turbine XSLT Service.  It transforms xml with a given
051:         * xsl file.  XSL stylesheets are compiled and cached (if the property in
052:         * TurbineResources.properties is set) to improve speeds.
053:         *
054:         * @author <a href="mailto:leon@opticode.co.za">Leon Messerschmidt</a>
055:         * @author <a href="mailto:rubys@us.ibm.com">Sam Ruby</a>
056:         * @author <a href="thomas.vandahl@tewisoft.de">Thomas Vandahl</a>
057:         * @version $Id: TurbineXSLTService.java 567398 2007-08-19 13:11:33Z tv $
058:         */
059:        public class TurbineXSLTService extends TurbineBaseService implements 
060:                XSLTService {
061:            /**
062:             * Property to control the caching of StyleSheetRoots.
063:             */
064:            protected boolean caching = false;
065:
066:            /**
067:             * Path to style sheets used for tranforming well-formed
068:             * XML documents. The path is relative to the webapp context.
069:             */
070:            protected String path;
071:
072:            /**
073:             * Cache of compiled StyleSheetRoots.
074:             */
075:            private LRUMap cache = new LRUMap(20);
076:
077:            /**
078:             * Factory for producing templates and null transformers
079:             */
080:            private static TransformerFactory tfactory;
081:
082:            /**
083:             * Initialize the TurbineXSLT Service.  Load the path to search for
084:             * xsl files and initiates the cache.
085:             */
086:            public void init() throws InitializationException {
087:                Configuration conf = getConfiguration();
088:
089:                path = conf.getString(STYLESHEET_PATH, STYLESHEET_PATH_DEFAULT);
090:                caching = conf.getBoolean(STYLESHEET_CACHING,
091:                        STYLESHEET_CACHING_DEFAULT);
092:
093:                tfactory = TransformerFactory.newInstance();
094:
095:                setInit(true);
096:            }
097:
098:            /**
099:             * Try to create a valid url object from the style parameter.
100:             *
101:             * @param style the xsl-Style
102:             * @return a <code>URL</code> object or null if the style sheet could not be found
103:             */
104:            private URL getStyleURL(String style) {
105:                StringBuffer sb = new StringBuffer(128);
106:
107:                if (StringUtils.isNotEmpty(path)) {
108:                    if (path.charAt(0) != '/') {
109:                        sb.append('/');
110:                    }
111:
112:                    sb.append(path);
113:
114:                    if (path.charAt(path.length() - 1) != '/') {
115:                        sb.append('/');
116:                    }
117:                } else {
118:                    sb.append('/');
119:                }
120:
121:                // we chop off the existing extension
122:                int colon = style.lastIndexOf(".");
123:
124:                if (colon > 0) {
125:                    sb.append(style.substring(0, colon));
126:                } else {
127:                    sb.append(style);
128:                }
129:
130:                sb.append(".xsl");
131:
132:                return TurbineServlet.getResource(sb.toString());
133:            }
134:
135:            /**
136:             * Compile Templates from an input URL.
137:             */
138:            protected Templates compileTemplates(URL source) throws Exception {
139:                InputStream in = source.openStream();
140:                StreamSource xslin = new StreamSource(in, source.toString());
141:                Templates root = TransformerFactory.newInstance().newTemplates(
142:                        xslin);
143:                in.close();
144:
145:                return root;
146:            }
147:
148:            /**
149:             * Retrieves Templates.  If caching is switched on the
150:             * first attempt is to load the Templates from the cache.
151:             * If caching is switched off or if the Stylesheet is not found
152:             * in the cache a new StyleSheetRoot is compiled from an input
153:             * file.
154:             */
155:            protected Templates getTemplates(String xslName) throws Exception {
156:                synchronized (cache) {
157:                    if (caching && cache.containsKey(xslName)) {
158:                        return (Templates) cache.get(xslName);
159:                    }
160:                }
161:
162:                URL url = getStyleURL(xslName);
163:
164:                if (url == null) {
165:                    return null;
166:                }
167:
168:                Templates sr = compileTemplates(url);
169:
170:                synchronized (cache) {
171:                    if (caching) {
172:                        cache.put(xslName, sr);
173:                    }
174:                }
175:
176:                return sr;
177:            }
178:
179:            /**
180:             * Transform the input source into the output source using the given style
181:             *
182:             * @param style the stylesheet parameter
183:             * @param in the input source
184:             * @param out the output source
185:             * @param params XSLT parameter for the style sheet
186:             *
187:             * @throws TransformerException
188:             */
189:            protected void transform(String style, Source in, Result out,
190:                    Map params) throws TransformerException, IOException,
191:                    Exception {
192:                Templates styleTemplate = getTemplates(style);
193:
194:                Transformer transformer = (styleTemplate != null) ? styleTemplate
195:                        .newTransformer()
196:                        : tfactory.newTransformer();
197:
198:                if (params != null) {
199:                    for (Iterator it = params.entrySet().iterator(); it
200:                            .hasNext();) {
201:                        Map.Entry entry = (Map.Entry) it.next();
202:                        transformer.setParameter(
203:                                String.valueOf(entry.getKey()), entry
204:                                        .getValue());
205:                    }
206:                }
207:
208:                //      Start the transformation and rendering process
209:                transformer.transform(in, out);
210:            }
211:
212:            /**
213:             * Execute an xslt
214:             */
215:            public void transform(String xslName, Reader in, Writer out)
216:                    throws Exception {
217:                Source xmlin = new StreamSource(in);
218:                Result xmlout = new StreamResult(out);
219:
220:                transform(xslName, xmlin, xmlout, null);
221:            }
222:
223:            /**
224:             * Execute an xslt
225:             */
226:            public String transform(String xslName, Reader in) throws Exception {
227:                StringWriter sw = new StringWriter();
228:                transform(xslName, in, sw);
229:                return sw.toString();
230:            }
231:
232:            /**
233:             * Execute an xslt
234:             */
235:            public void transform(String xslName, Node in, Writer out)
236:                    throws Exception {
237:                Source xmlin = new DOMSource(in);
238:                Result xmlout = new StreamResult(out);
239:
240:                transform(xslName, xmlin, xmlout, null);
241:            }
242:
243:            /**
244:             * Execute an xslt
245:             */
246:            public String transform(String xslName, Node in) throws Exception {
247:                StringWriter sw = new StringWriter();
248:                transform(xslName, in, sw);
249:                return sw.toString();
250:            }
251:
252:            /**
253:             * Execute an xslt
254:             */
255:            public void transform(String xslName, Reader in, Writer out,
256:                    Map params) throws Exception {
257:                Source xmlin = new StreamSource(in);
258:                Result xmlout = new StreamResult(out);
259:
260:                transform(xslName, xmlin, xmlout, params);
261:            }
262:
263:            /**
264:             * Execute an xslt
265:             */
266:            public String transform(String xslName, Reader in, Map params)
267:                    throws Exception {
268:                StringWriter sw = new StringWriter();
269:                transform(xslName, in, sw, params);
270:                return sw.toString();
271:            }
272:
273:            /**
274:             * Execute an xslt
275:             */
276:            public void transform(String xslName, Node in, Writer out,
277:                    Map params) throws Exception {
278:                Source xmlin = new DOMSource(in);
279:                Result xmlout = new StreamResult(out);
280:
281:                transform(xslName, xmlin, xmlout, params);
282:            }
283:
284:            /**
285:             * Execute an xslt
286:             */
287:            public String transform(String xslName, Node in, Map params)
288:                    throws Exception {
289:                StringWriter sw = new StringWriter();
290:                transform(xslName, in, sw, params);
291:                return sw.toString();
292:            }
293:
294:        }
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