Examples of com.google.common.io.Closer

com.google.common.io.Closer
oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html"> try-with-resources statement in JDK6-compatible code. Running on Java 7, code using this should be approximately equivalent in behavior to the same code written with try-with-resources. Running on Java 6, exceptions that cannot be thrown must be logged rather than being added to the thrown exception as a suppressed exception.
This class is intended to be used in the following pattern:
```
    {@code Closer closer = Closer.create();}try  InputStream in = closer.register(openInputStream()); OutputStream out = closer.register(openOutputStream()); // do stuff } catch (Throwable e) { // ensure that any checked exception types other than IOException that could be thrown are // provided here, e.g. throw closer.rethrow(e, CheckedException.class); throw closer.rethrow(e); } finally { closer.close(); }}
```
Note that this try-catch-finally block is not equivalent to a try-catch-finally block using try-with-resources. To get the equivalent of that, you must wrap the above code in another try block in order to catch any exception that may be thrown (including from the call to {@code close()}).
This pattern ensures the following:
- Each {@code Closeable} resource that is successfully registered will be closed later.
- If a {@code Throwable} is thrown in the try block, no exceptions that occur when attemptingto close resources will be thrown from the finally block. The throwable from the try block will be thrown.
- If no exceptions or errors were thrown in the try block, the first exception thrown by an attempt to close a resource will be thrown.
- Any exception caught when attempting to close a resource that is not thrown (because another exception is already being thrown) is suppressed.
An exception that is suppressed is not thrown. The method of suppression used depends on the version of Java the code is running on:
- Java 7+: Exceptions are suppressed by adding them to the exception that will be thrown using {@code Throwable.addSuppressed(Throwable)}.
- Java 6: Exceptions are suppressed by logging them instead.
@author Colin Decker @since 14.0

     * @param requestFactory Request factory for making the request.
     * @param uri            the uri to load data from.
     * @return the data in string form.
     */
    public static String toString(final MfClientHttpRequestFactory requestFactory, final URI uri) throws IOException {
        Closer closer = Closer.create();
        try {
            ClientHttpResponse response = closer.register(requestFactory.createRequest(uri, HttpMethod.GET).execute());


            InputStream input = closer.register(response.getBody());
            InputStreamReader reader = closer.register(new InputStreamReader(input, Constants.DEFAULT_ENCODING));
            BufferedReader bufferedReader = closer.register(new BufferedReader(reader));


            return CharStreams.toString(bufferedReader);
        } finally {
            closer.close();
        }
    }

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   */
  private List<FeedEvent> extractEntriesFromLogfile(final File logFile, final int entriesToExtract)
      throws IOException
  {
    final List<FeedEvent> entries = Lists.newArrayList();
    Closer closer = Closer.create();
    try {
      final BufferedReader reader =
          Files.newReader(logFile, Charset.forName("UTF-8"));
      String logLine = reader.readLine();
      while (logLine != null) {
        if (logLine.contains(" WARN ") || logLine.contains(" ERROR ")) {


          // FIXME: Grab following stacktrace if any in log
          // if ( StringUtils.isNotEmpty( item.getStackTrace() ) )
          // {
          // // we need <br/> and &nbsp; to display stack trace on RSS
          // String stackTrace = item.getStackTrace().replace(
          // (String) System.getProperties().get( "line.separator" ),
          // "<br/>" );
          // stackTrace = stackTrace.replace( "\t", "&nbsp;&nbsp;&nbsp;&nbsp;" );
          // contentValue.append( "<br/>" ).append( stackTrace );
          // }


          final FeedEvent entry = new FeedEvent(
              "LOG", // ignored
              "ERROR_WARNING", // ignored
              new Date(), // TODO: timestamp from log file?
              null, // author "system"
              null, // no link (maybe log config? or support?)
              Maps.<String, String>newHashMap()
          );
          if (logLine.contains(" ERROR ")) {
            entry.setTitle("Error");
          }
          else if (logLine.contains(" WARN ")) {
            entry.setTitle("Warning");
          }
          entry.setContent(logLine);


          entries.add(entry);
          if (entries.size() > entriesToExtract) {
            entries.remove(0);
          }
        }
        logLine = reader.readLine();
      }
    }
    catch (Throwable e) {
      throw closer.rethrow(e);
    }
    finally {
      closer.close();
    }
    return Lists.reverse(entries);
  }

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   * @return a not {@code null Set} of service class names.
   * @throws IOException
   */
  static Set<String> readServiceFile(InputStream input) throws IOException {
    HashSet<String> serviceClasses = new HashSet<String>();
    Closer closer = Closer.create();
    try {
      // TODO(gak): use CharStreams
      BufferedReader r = closer.register(new BufferedReader(new InputStreamReader(input, UTF_8)));
      String line;
      while ((line = r.readLine()) != null) {
        int commentStart = line.indexOf('#');
        if (commentStart >= 0) {
          line = line.substring(0, commentStart);
        }
        line = line.trim();
        if (!line.isEmpty()) {
          serviceClasses.add(line);
        }
      }
      return serviceClasses;
    } catch (Throwable t) {
      throw closer.rethrow(t);
    } finally {
      closer.close();
    }
  }

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        return reportURI.getScheme().equals("file");
    }


    @Override
    public final void loadReport(final URI reportURI, final OutputStream out) throws IOException {
        Closer closer = Closer.create();
        try {
            FileInputStream in = closer.register(new FileInputStream(reportURI.getPath()));
            FileChannel channel = closer.register(in.getChannel());
            channel.transferTo(0, Long.MAX_VALUE, Channels.newChannel(out));
        } finally {
            closer.close();
        }
    }

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            final String graphicFile,
            final Color backgroundColor, 
            final Double rotation,
            final File workingDir,
            final MfClientHttpRequestFactory clientHttpRequestFactory) throws Exception {
        final Closer closer = Closer.create();
        try {
            final RasterReference input = loadGraphic(graphicFile, clientHttpRequestFactory, closer);
            if (graphicFile == null || graphicFile.toLowerCase().trim().endsWith("svg")) {
                return createSvg(targetSize, input, rotation, backgroundColor, workingDir, clientHttpRequestFactory);
            } else {
                return createRaster(targetSize, input, rotation, backgroundColor, workingDir);
            }
        } finally {
            closer.close();
        }
    }

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  /**
   * Create a temporary ANT file for executing JUnit4 ANT task.
   */
  private File createTemporaryAntFile(Document doc) throws IOException {
    Closer closer = Closer.create();
    try {
      File antFile = File.createTempFile("junit4-ant-", ".xml", dir);
      OutputStream os = closer.register(new FileOutputStream(antFile));
      XMLWriter xmlWriter = new XMLWriter(os, OutputFormat.createPrettyPrint());
      xmlWriter.write(doc);
      return antFile;
    } catch (Throwable t) {
      throw closer.rethrow(t);
    } finally {
      closer.close();
    }
  }

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      public void receiveQuit(QuitEvent e) {
        slave.end = System.currentTimeMillis();
      }      
    });


    Closer closer = Closer.create();
    closer.register(eventStream);
    closer.register(w);
    try {
      OutputStream sysout = closer.register(new BufferedOutputStream(new FileOutputStream(sysoutFile)));
      OutputStream syserr = closer.register(new BufferedOutputStream(new FileOutputStream(syserrFile)));
      RandomAccessFile streamsBuffer = closer.register(new RandomAccessFile(streamsBufferFile, "rw"));


      Execute execute = forkProcess(slave, eventBus, commandline, eventStream, sysout, syserr, streamsBuffer);
      log("Forked JVM J" + slave.id + " finished with exit code: " + execute.getExitValue(), Project.MSG_DEBUG);


      if (execute.isFailure()) {
        final int exitStatus = execute.getExitValue();
        switch (exitStatus) {
          case SlaveMain.ERR_NO_JUNIT:
            throw new BuildException("Forked JVM's classpath must include a junit4 JAR.");
          case SlaveMain.ERR_OLD_JUNIT:
            throw new BuildException("Forked JVM's classpath must use JUnit 4.10 or newer.");
          default:
            Closeables.close(sysout, false);
            Closeables.close(syserr, false);


            StringBuilder message = new StringBuilder();
            if (exitStatus == SlaveMain.ERR_OOM) {
              message.append("Forked JVM ran out of memory.");
            } else {
              message.append("Forked process returned with error code: ").append(exitStatus).append(".");
            }


            if (sysoutFile.length() > 0 || syserrFile.length() > 0) {
              if (exitStatus != SlaveMain.ERR_OOM) {
                message.append(" Very likely a JVM crash. ");
              }


              if (jvmOutputAction.contains(JvmOutputAction.PIPE)) {
                message.append(" Process output piped in logs above.");
              } else if (!jvmOutputAction.contains(JvmOutputAction.IGNORE)) {
                if (sysoutFile.length() > 0) {
                  message.append(" See process stdout at: " + sysoutFile.getAbsolutePath());
                }
                if (syserrFile.length() > 0) {
                  message.append(" See process stderr at: " + syserrFile.getAbsolutePath());
                }
              }
            }
            throw new BuildException(message.toString());
        }
      }
    } catch (Throwable t) {
      throw closer.rethrow(t);
    } finally {
      try {
        closer.close();
      } finally {
        Files.asByteSource(classNamesDynamic).copyTo(Files.asByteSink(classNamesFile, FileWriteMode.APPEND));
        classNamesDynamic.delete();
        streamsBufferFile.delete();

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                name = "ratings-" + UUID.randomUUID().toString() + ".csv";
            }
            logger.info("writing ratings to {}", name);
            File file = new File(workingDir, name);
            try {
                Closer closer = Closer.create();
                try {
                    PrintWriter writer = closer.register(new PrintWriter(file));
                    Cursor<Rating> ratings = closer.register(eventDAO.streamEvents(Rating.class));
                    for (Rating r: ratings) {
                        writer.printf("%d,%d,", r.getUserId(), r.getItemId());
                        Preference p = r.getPreference();
                        if (p != null) {
                            writer.print(p.getValue());
                        }
                        writer.print(",");
                        long ts = r.getTimestamp();
                        if (ts >= 0) {
                            writer.print(ts);
                        }
                        writer.println();
                    }
                } catch (Throwable th) {
                    throw closer.rethrow(th);
                } finally {
                    closer.close();
                }
            } catch (IOException e) {
                throw new RuntimeException("Error creating ratings file", e);
            }
            return name;

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                name = prefix + "-" + UUID.randomUUID().toString() + ".csv";
            }
            logger.info("writing {} to {}", prefix, name);
            File file = new File(workingDir, name);
            try {
                Closer closer = Closer.create();
                try {
                    PrintWriter writer = closer.register(new PrintWriter(file));
                    LongSet ids = getIds();
                    LongIterator iter = ids.iterator();
                    while (iter.hasNext()) {
                        writer.println(iter.nextLong());
                    }
                } catch (Throwable th) {
                    throw closer.rethrow(th);
                } finally {
                    closer.close();
                }
            } catch (IOException e) {
                throw new RuntimeException("Error creating ratings file", e);
            }
            return name;

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            if (cacheDir.mkdirs()) {
                logger.debug("created cache directory {}", cacheDir);
            }
            StagedWrite stage = StagedWrite.begin(cacheFile);
            try {
                Closer closer = Closer.create();
                try {
                    OutputStream out = closer.register(stage.openOutputStream());
                    OutputStream gzOut = closer.register(new GZIPOutputStream(out));
                    ObjectOutputStream objOut = closer.register(new ObjectOutputStream(gzOut));
                    objOut.writeObject(obj);
                } catch (Throwable th) {
                    throw closer.rethrow(th);
                } finally {
                    closer.close();
                }
                stage.commit();
            } finally {
                stage.close();
            }

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