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37 package net.sourceforge.cruisecontrol.taglib;
38
39 import java.io.BufferedReader  ;
40 import java.io.File ;
41 import java.io.FileInputStream ;
42 import java.io.FileOutputStream ;
43 import java.io.IOException ;
44 import java.io.InputStream ;
45 import java.io.InputStreamReader ;
46 import java.io.OutputStream ;
47 import java.io.Reader ;
48 import java.io.Writer ;
49 import java.net.URL ;
50 import java.net.URLConnection ;
51 import java.util.Enumeration ;
52 import java.util.HashMap ;
53 import java.util.Iterator ;
54 import java.util.Map ;
55
56 import javax.servlet.ServletConfig ;
57 import javax.servlet.ServletContext ;
58 import javax.servlet.jsp.JspException ;
59 import javax.servlet.jsp.JspTagException ;
60 import javax.xml.transform.Transformer ;
61 import javax.xml.transform.TransformerException ;
62 import javax.xml.transform.TransformerFactory ;
63 import javax.xml.transform.stream.StreamResult ;
64 import javax.xml.transform.stream.StreamSource ;
65
66 import net.sourceforge.cruisecontrol.LogFile;
67 import net.sourceforge.cruisecontrol.util.CCTagException;
68
69
76 public class XSLTag extends CruiseControlTagSupport {
77 private static final String XSLT_PARAMETER_PREFIX = "xslt.";
78 private String xslFileName;
79 private static final String CACHE_DIR = "_cache";
80
81 public void release() {
82 xslFileName = null;
83 }
84
85
86
93 protected void transform(LogFile xmlFile, URL style, OutputStream out) throws JspTagException {
94 InputStream in = null;
95
96 try {
97 TransformerFactory tFactory = TransformerFactory.newInstance();
98 Transformer transformer = tFactory.newTransformer(new StreamSource (style.toExternalForm()));
99 Map parameters = getXSLTParameters();
100 if (!parameters.isEmpty()) {
101 transformer.clearParameters();
102 for (Iterator i = parameters.entrySet().iterator(); i.hasNext(); ) {
103 Map.Entry entry = (Map.Entry ) i.next();
104 transformer.setParameter((String ) entry.getKey(), entry.getValue());
105 }
106 }
107
108 try {
109 in = xmlFile.getInputStream();
110 } catch (IOException ioex) {
111 err(ioex);
112 throw new CCTagException("Cannot read logfile: "
113 + ioex.getMessage(), ioex);
114 }
115 transformer.transform(new StreamSource (in), new StreamResult (out));
116 } catch (ArrayIndexOutOfBoundsException e) {
117 err(e);
118 throw new CCTagException("Error transforming '" + xmlFile.getName()
119 + "'. You might be experiencing XML parser issues."
120 + " Are your xalan & xerces jar files mismatched? Check your JVM version. "
121 + e.getMessage(), e);
122 } catch (TransformerException e) {
123 err(e);
124 throw new CCTagException("Error transforming '" + xmlFile.getName()
125 + "': " + e.getMessage(), e);
126 } finally {
127 closeQuietly(in);
128 }
129 }
130
131
137 protected boolean isCacheFileCurrent(File xmlFile, File cacheFile) {
138 if (!cacheFile.exists() || cacheFile.length() == 0) {
139 return false;
140 }
141 boolean isCurrent = false;
142 long xmlLastModified = xmlFile.lastModified();
143 long cacheLastModified = cacheFile.lastModified();
144 try {
145 URL xslUrl = getPageContext().getServletContext().getResource(xslFileName);
146 URLConnection con = xslUrl.openConnection();
147 long xslLastModified = con.getLastModified();
148 isCurrent = (cacheLastModified > xmlLastModified) && (cacheLastModified > xslLastModified);
149 } catch (Exception e) {
150 err("Failed to retrieve lastModified of xsl file " + xslFileName);
151 }
152 return isCurrent;
153 }
154
155
161 protected void serveCachedCopy(File cacheFile, Writer out) throws JspTagException {
162 try {
163 InputStream input = new FileInputStream (cacheFile);
164 copy(input, out);
165 } catch (IOException e) {
166 err(e);
167 throw new CCTagException("Error reading file '"
168 + cacheFile.getName() + "': " + e.getMessage(), e);
169 }
170 }
171
172 private void copy(InputStream input, Writer out) throws IOException {
173 BufferedReader in;
174 in = new BufferedReader (new InputStreamReader (input, "UTF-8"));
175
176 try {
177 char[] cbuf = new char[8192];
178 while (true) {
179 int charsRead = in.read(cbuf);
180 if (charsRead == -1) {
181 break;
182 }
183 out.write(cbuf, 0, charsRead);
184 }
185 } finally {
186 closeQuietly(in);
187 }
188 }
189
190
197 protected String getCachedCopyFileName(File xmlFile) {
198 String xmlFileName = xmlFile.getName().substring(0, xmlFile.getName().lastIndexOf("."));
199
200 int slashIndex = xslFileName.lastIndexOf("/");
203 String styleSheetName = xslFileName.substring(slashIndex + 1, xslFileName.lastIndexOf("."));
204 return xmlFileName + "-" + styleSheetName + ".html";
205 }
206
207 Map getXSLTParameters() {
208 Map xsltParameters = new HashMap ();
209 ServletConfig config = pageContext.getServletConfig();
210 Enumeration names = config.getInitParameterNames();
211 while (names.hasMoreElements()) {
212 String parameterName = (String ) names.nextElement();
213 if (parameterName.startsWith(XSLT_PARAMETER_PREFIX)) {
214 String value = config.getInitParameter(parameterName);
215 String name = parameterName.substring(XSLT_PARAMETER_PREFIX.length());
216 info("using XSLT parameter: " + name + "=" + value);
217 xsltParameters.put(name, value);
218 }
219 }
220 ServletContext context = config.getServletContext();
221 names = context.getInitParameterNames();
222 while (names.hasMoreElements()) {
223 String parameterName = (String ) names.nextElement();
224 if (parameterName.startsWith(XSLT_PARAMETER_PREFIX)) {
225 String value = context.getInitParameter(parameterName);
226 String name = parameterName.substring(XSLT_PARAMETER_PREFIX.length());
227 info("using XSLT parameter: " + name + "=" + value);
228 xsltParameters.put(name, value);
229 }
230 }
231
232 return xsltParameters;
233 }
234
235
241 public void setXslFile(String xslFile) {
242 xslFileName = xslFile;
243 }
244
245
251 File prepareContent() throws JspException {
252 LogFile xmlFile = findLogFile();
253 File cacheFile = findCacheFile(xmlFile);
254 if (!isCacheFileCurrent(xmlFile.getFile(), cacheFile)) {
255 info("Updating cached copy: " + cacheFile.getAbsolutePath());
256 updateCacheFile(xmlFile, cacheFile);
257 } else {
258 info("Using cached copy: " + cacheFile.getAbsolutePath());
259 }
260 return cacheFile;
261 }
262
263 protected void updateCacheFile(LogFile xmlFile, File cacheFile) throws JspTagException {
264 OutputStream out = null;
265 try {
266 out = new FileOutputStream (cacheFile);
267 URL style = getPageContext().getServletContext().getResource(xslFileName);
268 transform(xmlFile, style, out);
269 } catch (IOException e) {
270 err(e);
271 throw new CCTagException("Error saving a cached transformation '"
272 + cacheFile.getName() + "': " + e.getMessage(), e);
273 } finally {
274 closeQuietly(out);
275 }
276 }
277
278 private File findCacheFile(LogFile xmlFile) {
279 String cacheRoot = getContextParam("cacheRoot");
280 File cacheDir = cacheRoot == null
281 ? new File (xmlFile.getLogDirectory(), CACHE_DIR)
282 : new File (cacheRoot + File.separator + getProject());
283 if (!cacheDir.exists()) {
284 cacheDir.mkdir();
285 }
286 File cacheFile = new File (cacheDir, getCachedCopyFileName(xmlFile.getFile()));
287 return cacheFile;
288 }
289
290 public int doEndTag() throws JspException {
291 File cachedFile = prepareContent();
292 serveCachedCopy(cachedFile, getPageContext().getOut());
293 return EVAL_PAGE;
294 }
295
296 private void closeQuietly(InputStream in) {
297 if (in != null) {
298 try {
299 in.close();
300 } catch (IOException ioex) {
301 info("Ignored " + ioex.getMessage() + " while closing stream");
302 }
303 }
304 }
305 private void closeQuietly(Reader in) {
306 if (in != null) {
307 try {
308 in.close();
309 } catch (IOException ioex) {
310 info("Ignored " + ioex.getMessage() + " while closing reader");
311 }
312 }
313 }
314 private void closeQuietly(OutputStream out) {
315 if (out != null) {
316 try {
317 out.close();
318 } catch (IOException ioex) {
319 info("Ignored " + ioex.getMessage() + " while closing stream");
320 }
321 }
322 }
323 }
324 |
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