org.eclipse.linuxtools.tmf.ui/src/org/eclipse/linuxtools/tmf/ui/parsers/custom/CustomXmlTrace.java

   1 /*******************************************************************************
   2  * Copyright (c) 2010 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Patrick Tasse - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.tmf.ui.parsers.custom;
  14
  15 import java.io.ByteArrayInputStream;
  16 import java.io.File;
  17 import java.io.FileNotFoundException;
  18 import java.io.IOException;
  19 import java.io.RandomAccessFile;
  20
  21 import javax.xml.parsers.DocumentBuilder;
  22 import javax.xml.parsers.DocumentBuilderFactory;
  23 import javax.xml.parsers.ParserConfigurationException;
  24
  25 import org.eclipse.linuxtools.tmf.event.TmfEvent;
  26 import org.eclipse.linuxtools.tmf.event.TmfEventReference;
  27 import org.eclipse.linuxtools.tmf.event.TmfEventSource;
  28 import org.eclipse.linuxtools.tmf.event.TmfTimestamp;
  29 import org.eclipse.linuxtools.tmf.io.BufferedRandomAccessFile;
  30 import org.eclipse.linuxtools.tmf.trace.ITmfContext;
  31 import org.eclipse.linuxtools.tmf.trace.ITmfLocation;
  32 import org.eclipse.linuxtools.tmf.trace.ITmfTrace;
  33 import org.eclipse.linuxtools.tmf.trace.TmfContext;
  34 import org.eclipse.linuxtools.tmf.trace.TmfLocation;
  35 import org.eclipse.linuxtools.tmf.trace.TmfTrace;
  36 import org.eclipse.linuxtools.tmf.ui.parsers.custom.CustomXmlTraceDefinition.InputAttribute;
  37 import org.eclipse.linuxtools.tmf.ui.parsers.custom.CustomXmlTraceDefinition.InputElement;
  38 import org.w3c.dom.Document;
  39 import org.w3c.dom.Element;
  40 import org.w3c.dom.Node;
  41 import org.w3c.dom.NodeList;
  42 import org.xml.sax.EntityResolver;
  43 import org.xml.sax.ErrorHandler;
  44 import org.xml.sax.InputSource;
  45 import org.xml.sax.SAXException;
  46 import org.xml.sax.SAXParseException;
  47
  48 public class CustomXmlTrace extends TmfTrace<CustomXmlEvent> {
  49
  50     private static final TmfLocation<Long> NULL_LOCATION = new TmfLocation<Long>((Long) null);
  51
  52     private CustomXmlTraceDefinition fDefinition;
  53     private CustomXmlEventType fEventType;
  54     private InputElement fRecordInputElement;
  55
  56     public CustomXmlTrace(String name, CustomXmlTraceDefinition definition, String path, int cacheSize) throws FileNotFoundException {
  57         super(name, CustomXmlEvent.class, path, cacheSize);
  58         fDefinition = definition;
  59         fEventType = new CustomXmlEventType(fDefinition);
  60         fRecordInputElement = getRecordInputElement(fDefinition.rootInputElement);
  61     }
  62
  63     @Override
  64     public TmfContext seekLocation(ITmfLocation<?> location) {
  65         //System.out.println(Thread.currentThread().getName() + "::" + getName() + " seekLocation(" + ((location == null || location.getLocation() == null) ? "null" : location) + ")");
  66         //new Throwable().printStackTrace();
  67         CustomXmlTraceContext context = new CustomXmlTraceContext(NULL_LOCATION, ITmfContext.INITIAL_RANK);
  68         if (NULL_LOCATION.equals(location) || !new File(getPath()).isFile()) {
  69             return context;
  70         }
  71         try {
  72             context.raFile = new BufferedRandomAccessFile(getPath(), "r"); //$NON-NLS-1$
  73             if (location != null && location.getLocation() instanceof Long) {
  74                 context.raFile.seek((Long)location.getLocation());
  75             }
  76
  77             String line;
  78             String recordElementStart = "<" + fRecordInputElement.elementName; //$NON-NLS-1$
  79             long rawPos = context.raFile.getFilePointer();
  80
  81             while ((line = context.raFile.getNextLine()) != null) {
  82                 int idx = line.indexOf(recordElementStart);
  83                 if (idx != -1) {
  84                     context.setLocation(new TmfLocation<Long>(rawPos + idx));
  85                     return context;
  86                 }
  87                 rawPos = context.raFile.getFilePointer();
  88             }
  89             return context;
  90         } catch (FileNotFoundException e) {
  91             e.printStackTrace();
  92             return context;
  93         } catch (IOException e) {
  94             e.printStackTrace();
  95             return context;
  96         }
  97
  98     }
  99
 100     @Override
 101     public TmfContext seekLocation(double ratio) {
 102         try {
 103             BufferedRandomAccessFile raFile = new BufferedRandomAccessFile(getPath(), "r"); //$NON-NLS-1$
 104             long pos = (long) (ratio * raFile.length());
 105             while (pos > 0) {
 106                 raFile.seek(pos - 1);
 107                 if (raFile.read() == '\n') break;
 108                 pos--;
 109             }
 110             ITmfLocation<?> location = new TmfLocation<Long>(new Long(pos));
 111             TmfContext context = seekLocation(location);
 112             context.setRank(ITmfContext.UNKNOWN_RANK);
 113             return context;
 114         } catch (FileNotFoundException e) {
 115             e.printStackTrace();
 116             return new CustomXmlTraceContext(NULL_LOCATION, ITmfContext.INITIAL_RANK);
 117         } catch (IOException e) {
 118             e.printStackTrace();
 119             return new CustomXmlTraceContext(NULL_LOCATION, ITmfContext.INITIAL_RANK);
 120         }
 121     }
 122
 123     @Override
 124     public double getLocationRatio(ITmfLocation<?> location) {
 125         try {
 126             if (location.getLocation() instanceof Long) {
 127                 RandomAccessFile raFile = new RandomAccessFile(getPath(), "r"); //$NON-NLS-1$
 128                 return (double) ((Long) location.getLocation()) / raFile.length();
 129             }
 130         } catch (FileNotFoundException e) {
 131             e.printStackTrace();
 132         } catch (IOException e) {
 133             e.printStackTrace();
 134         }
 135         return 0;
 136     }
 137
 138     @Override
 139         public ITmfTrace createTraceCopy() {
 140         // TODO Auto-generated method stub
 141         return null;
 142     }
 143
 144     @Override
 145     public ITmfLocation<?> getCurrentLocation() {
 146         // TODO Auto-generated method stub
 147         return null;
 148     }
 149
 150     @Override
 151     public synchronized TmfEvent getNextEvent(TmfContext context) {
 152         ITmfContext savedContext = context.clone();
 153         TmfEvent event = parseEvent(context);
 154         if (event != null) {
 155             updateIndex(savedContext, savedContext.getRank(), event.getTimestamp());
 156             context.updateRank(1);
 157         }
 158         return event;
 159     }
 160
 161     @Override
 162     public TmfEvent parseEvent(TmfContext tmfContext) {
 163         //System.out.println(Thread.currentThread().getName() + ":: " + getName() + " parseEvent(" + tmfContext.getRank() + " @ " + (tmfContext.getLocation().getLocation() == null ? "null" : tmfContext.getLocation()));
 164         if (!(tmfContext instanceof CustomXmlTraceContext)) {
 165             return null;
 166         }
 167
 168         CustomXmlTraceContext context = (CustomXmlTraceContext) tmfContext;
 169         if (!(context.getLocation().getLocation() instanceof Long) || NULL_LOCATION.equals(context.getLocation())) {
 170             return null;
 171         }
 172
 173         synchronized (context.raFile) {
 174             CustomXmlEvent event = null;
 175             try {
 176                 if (context.raFile.getFilePointer() != (Long)context.getLocation().getLocation() + 1) {
 177                     context.raFile.seek((Long)context.getLocation().getLocation() + 1); // +1 is for the <
 178                 }
 179                 StringBuffer elementBuffer = new StringBuffer("<"); //$NON-NLS-1$
 180                 readElement(elementBuffer, context.raFile);
 181                 Element element = parseElementBuffer(elementBuffer);
 182
 183                 event = extractEvent(element, fRecordInputElement);
 184                 ((StringBuffer) event.getContent().getContent()).append(elementBuffer);
 185
 186                 String line;
 187                 String recordElementStart = "<" + fRecordInputElement.elementName; //$NON-NLS-1$
 188                 long rawPos = context.raFile.getFilePointer();
 189
 190                 while ((line = context.raFile.getNextLine()) != null) {
 191                     int idx = line.indexOf(recordElementStart);
 192                     if (idx != -1) {
 193                         context.setLocation(new TmfLocation<Long>(rawPos + idx));
 194                         return event;
 195                     }
 196                     rawPos = context.raFile.getFilePointer();
 197                 }
 198             } catch (IOException e) {
 199                 e.printStackTrace();
 200             }
 201             context.setLocation(NULL_LOCATION);
 202             return event;
 203         }
 204     }
 205
 206     private Element parseElementBuffer(StringBuffer elementBuffer) {
 207         try {
 208             DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
 209             DocumentBuilder db = dbf.newDocumentBuilder();
 210
 211             // The following allows xml parsing without access to the dtd
 212             EntityResolver resolver = new EntityResolver () {
 213                 @Override
 214                                 public InputSource resolveEntity (String publicId, String systemId) {
 215                     String empty = ""; //$NON-NLS-1$
 216                     ByteArrayInputStream bais = new ByteArrayInputStream(empty.getBytes());
 217                     return new InputSource(bais);
 218                 }
 219             };
 220             db.setEntityResolver(resolver);
 221
 222             // The following catches xml parsing exceptions
 223             db.setErrorHandler(new ErrorHandler(){
 224                 @Override
 225                                 public void error(SAXParseException saxparseexception) throws SAXException {}
 226                 @Override
 227                                 public void warning(SAXParseException saxparseexception) throws SAXException {}
 228                 @Override
 229                                 public void fatalError(SAXParseException saxparseexception) throws SAXException {
 230                     throw saxparseexception;
 231                 }});
 232
 233             Document doc = db.parse(new ByteArrayInputStream(elementBuffer.toString().getBytes()));
 234             return doc.getDocumentElement();
 235         } catch (ParserConfigurationException e) {
 236             e.printStackTrace();
 237         } catch (SAXException e) {
 238             e.printStackTrace();
 239         } catch (IOException e) {
 240             e.printStackTrace();
 241         }
 242         return null;
 243     }
 244
 245     private void readElement(StringBuffer buffer, RandomAccessFile raFile) {
 246         try {
 247             int numRead = 0;
 248             boolean startTagClosed = false;
 249             int i;
 250             while ((i = raFile.read()) != -1) {
 251                 numRead++;
 252                 char c = (char)i;
 253                 buffer.append(c);
 254                 if (c == '"') {
 255                     readQuote(buffer, raFile, '"');
 256                 } else if (c == '\'') {
 257                     readQuote(buffer, raFile, '\'');
 258                 } else if (c == '<') {
 259                     readElement(buffer, raFile);
 260                 } else if (c == '/' && numRead == 1) {
 261                     break; // found "</"
 262                 } else if (c == '-' && numRead == 3 && buffer.substring(buffer.length() - 3, buffer.length() - 1).equals("!-")) { //$NON-NLS-1$
 263                     readComment(buffer, raFile); // found "<!--"
 264                 } else if (i == '>') {
 265                     if (buffer.charAt(buffer.length() - 2) == '/') {
 266                         break; // found "/>"
 267                     } else if (startTagClosed) {
 268                         break; // found "<...>...</...>"
 269                     } else {
 270                         startTagClosed = true; // found "<...>"
 271                     }
 272                 }
 273             }
 274             return;
 275         } catch (IOException e) {
 276             return;
 277         }
 278     }
 279
 280     private void readQuote(StringBuffer buffer, RandomAccessFile raFile, char eq) {
 281         try {
 282             int i;
 283             while ((i = raFile.read()) != -1) {
 284                 char c = (char)i;
 285                 buffer.append(c);
 286                 if (c == eq) {
 287                     break; // found matching end-quote
 288                 }
 289             }
 290             return;
 291         } catch (IOException e) {
 292             return;
 293         }
 294     }
 295
 296     private void readComment(StringBuffer buffer, RandomAccessFile raFile) {
 297         try {
 298             int numRead = 0;
 299             int i;
 300             while ((i = raFile.read()) != -1) {
 301                 numRead++;
 302                 char c = (char)i;
 303                 buffer.append(c);
 304                 if (c == '>' && numRead >= 2 && buffer.substring(buffer.length() - 3, buffer.length() - 1).equals("--")) { //$NON-NLS-1$
 305                     break; // found "-->"
 306                 }
 307             }
 308             return;
 309         } catch (IOException e) {
 310             return;
 311         }
 312     }
 313
 314     public static StringBuffer parseElement(Element parentElement, StringBuffer buffer) {
 315         NodeList nodeList = parentElement.getChildNodes();
 316         String separator = null;
 317         for (int i = 0; i < nodeList.getLength(); i++) {
 318             Node node = nodeList.item(i);
 319             if (node.getNodeType() == Node.ELEMENT_NODE) {
 320                 if (separator == null) {
 321                     separator = " | "; //$NON-NLS-1$
 322                 } else {
 323                     buffer.append(separator);
 324                 }
 325                 Element element = (Element) node;
 326                 if (element.hasChildNodes() == false) {
 327                     buffer.append(element.getNodeName());
 328                 } else if (element.getChildNodes().getLength() == 1 && element.getFirstChild().getNodeType() == Node.TEXT_NODE) {
 329                     buffer.append(element.getNodeName() + ":" + element.getFirstChild().getNodeValue().trim()); //$NON-NLS-1$
 330                 } else {
 331                     buffer.append(element.getNodeName());
 332                     buffer.append(" [ "); //$NON-NLS-1$
 333                     parseElement(element, buffer);
 334                     buffer.append(" ]"); //$NON-NLS-1$
 335                 }
 336             } else if (node.getNodeType() == Node.TEXT_NODE) {
 337                 if (node.getNodeValue().trim().length() != 0) {
 338                     buffer.append(node.getNodeValue().trim());
 339                 }
 340             }
 341         }
 342         return buffer;
 343     }
 344
 345     public InputElement getRecordInputElement(InputElement inputElement) {
 346         if (inputElement.logEntry) {
 347             return inputElement;
 348         } else if (inputElement.childElements != null) {
 349             for (InputElement childInputElement : inputElement.childElements) {
 350                 InputElement recordInputElement = getRecordInputElement(childInputElement);
 351                 if (recordInputElement != null) {
 352                     return recordInputElement;
 353                 }
 354             }
 355         }
 356         return null;
 357     }
 358
 359     public CustomXmlEvent extractEvent(Element element, InputElement inputElement) {
 360         CustomXmlEvent event = new CustomXmlEvent(fDefinition, TmfTimestamp.Zero, new TmfEventSource(""), fEventType, new TmfEventReference("")); //$NON-NLS-1$ //$NON-NLS-2$
 361         event.setContent(new CustomEventContent(event, new StringBuffer()));
 362         parseElement(element, event, inputElement);
 363         return event;
 364     }
 365
 366     private void parseElement(Element element, CustomXmlEvent event, InputElement inputElement) {
 367         if (inputElement.inputName != null && !inputElement.inputName.equals(CustomXmlTraceDefinition.TAG_IGNORE)) {
 368             event.parseInput(parseElement(element, new StringBuffer()).toString(), inputElement.inputName, inputElement.inputAction, inputElement.inputFormat);
 369         }
 370         if (inputElement.attributes != null) {
 371             for (InputAttribute attribute : inputElement.attributes) {
 372                 event.parseInput(element.getAttribute(attribute.attributeName), attribute.inputName, attribute.inputAction, attribute.inputFormat);
 373             }
 374         }
 375         NodeList childNodes = element.getChildNodes();
 376         if (inputElement.childElements != null) {
 377             for (int i = 0; i < childNodes.getLength(); i++) {
 378                 Node node = childNodes.item(i);
 379                 if (node instanceof Element) {
 380                     for (InputElement child : inputElement.childElements) {
 381                         if (node.getNodeName().equals(child.elementName)) {
 382                             parseElement((Element) node, event, child);
 383                             break;
 384                         }
 385                     }
 386                 }
 387             }
 388         }
 389         return;
 390     }
 391
 392     public CustomTraceDefinition getDefinition() {
 393         return fDefinition;
 394     }
 395 }