Example usage for java.io RandomAccessFile readLine

Introduction

In this page you can find the example usage for java.io RandomAccessFile readLine.

Prototype

public final String readLine() throws IOException 

Source Link

Document

Reads the next line of text from this file.

Usage

From source file:org.xwalk.runtime.extension.api.device_capabilities.DeviceCapabilitiesMemory.java

private long getTotalMemFromFile() {
    long capacity = 0;
    RandomAccessFile file = null;

    try {/*ww  w  .ja va 2  s . c  om*/
        file = new RandomAccessFile(MEM_INFO_FILE, "r");
        String line = file.readLine();

        String[] arrs = line.split(":");
        if (!arrs[0].equals("MemTotal")) {
            return 0;
        }
        String[] values = arrs[1].trim().split("\\s+");
        capacity = Long.parseLong(values[0]) * 1024;
    } catch (IOException e) {
        capacity = 0;
        Log.e(TAG, e.toString());
    } finally {
        try {
            if (file != null) {
                file.close();
            }
        } catch (IOException e) {
            Log.e(TAG, e.toString());
        }
    }

    return capacity;
}

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From source file:net.naijatek.myalumni.util.utilities.FileUtil.java

public static String[] getLastLines(final File file, final int linesToReturn, final String logType)
        throws IOException, FileNotFoundException {

    final int AVERAGE_CHARS_PER_LINE = 250;
    final int BYTES_PER_CHAR = 2;

    RandomAccessFile randomAccessFile = null;
    StringBuffer buffer = new StringBuffer(linesToReturn * AVERAGE_CHARS_PER_LINE);
    int lineTotal = 0;
    try {/*from  w w w .  ja  v a  2s  . c  o  m*/
        randomAccessFile = new RandomAccessFile(file, "r");
        long byteTotal = randomAccessFile.length();
        long byteEstimateToRead = linesToReturn * AVERAGE_CHARS_PER_LINE * BYTES_PER_CHAR;

        long offset = byteTotal - byteEstimateToRead;
        if (offset < 0) {
            offset = 0;
        }

        randomAccessFile.seek(offset);
        //log.debug("SKIP IS ::" + offset);

        String line = null;
        String lineUTF8 = null;
        while ((line = randomAccessFile.readLine()) != null) {
            lineUTF8 = new String(line.getBytes("ISO8859_1"), "UTF-8");
            lineTotal++;
            buffer.append(lineUTF8).append("\n");
        }
    } finally {
        if (randomAccessFile != null) {
            try {
                randomAccessFile.close();
            } catch (IOException ex) {
            }
        }
    }

    //String[] resultLines = new String[linesToReturn];
    ArrayList<String> resultLines = new ArrayList<String>();
    BufferedReader in = null;
    try {
        in = new BufferedReader(new StringReader(buffer.toString()));

        int start = lineTotal /* + 2 */ - linesToReturn; // Ex : 55 - 10 = 45 ~ offset
        if (start < 0) {
            start = 0; // not start line
        }
        for (int i = 0; i < start; i++) {
            in.readLine(); // loop until the offset. Ex: loop 0, 1 ~~ 2 lines
        }

        int i = 0;
        String line = null;
        while ((line = in.readLine()) != null) {
            if (logType.equalsIgnoreCase("ALL")) {
                //resultLines[i] = line;
                resultLines.add(line);
                i++;
            } else if (line.indexOf(logType) > -1) {
                //resultLines[i] = line;
                resultLines.add(line);
                i++;
            }
        }
    } catch (IOException ie) {
        logger.error("Error" + ie);
        throw ie;
    } finally {
        if (in != null) {
            try {
                in.close();
            } catch (IOException ex) {
            }
        }
    }

    String[] resultLines1 = new String[resultLines.size()];
    String tmp = new String();
    for (int i = 0; i < resultLines.size(); i++) {
        tmp = (String) resultLines.get(i);
        resultLines1[i] = tmp;
    }

    return resultLines1;
}

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From source file:titutorial.sysinfo.SysteminfoModule.java

@Kroll.method
public String getTotalRAM() {
    RandomAccessFile reader = null;
    String load = null;//  w w w .  ja v a 2s  . co  m
    try {
        reader = new RandomAccessFile("/proc/meminfo", "r");
        load = reader.readLine();
        load = load.replace("MemTotal:", "");
        load = load.replaceAll("\\s+", " ");
    } catch (IOException ex) {
        ex.printStackTrace();
    } finally {
        // Streams.close(reader);
    }
    return load;
}

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From source file:pl.wasko.utils.xlsxtract.MainFrame.java

private String[] readMainCfgFile(File selectedFile) throws FileNotFoundException, IOException {
    RandomAccessFile raf = new RandomAccessFile(selectedFile, "r");

    List<String> mainCfgData = new ArrayList<>();
    String line;/*from   w w w .  j  a  v a  2s  .  co m*/
    while ((line = raf.readLine()) != null) {
        String[] cline = line.split("=");
        if (cline.length != 2) {
            System.err.println("niepoprawna linai w glownym pliku konfiguracyjnym: " + line);
        } else {
            mainCfgData.add("Typrek: " + cline[0] + ", " + cline[1]);
        }
    }
    return mainCfgData.toArray(new String[mainCfgData.size()]);
}

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From source file:org.openoverlayrouter.noroot.logActivity.java

public void refresh() {

    StringBuffer contents = new StringBuffer();

    final StringBuffer fixedContents = contents;

    try {//w w  w  . jav a  2  s  .  c  om
        RandomAccessFile logFile = new RandomAccessFile(log_file, "r");
        if (logFile.length() > maxReadBytes) {
            logFile.seek(logFile.length() - maxReadBytes);
        }
        String currentLine = logFile.readLine();
        while (currentLine != null) {

            if (currentLine != null) {
                contents.append(currentLine);
                contents.append('\n');
            }
            currentLine = logFile.readLine();
        }
        try {
            if (logFile != null) {
                logFile.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {

    }

    mHandler.post(new Runnable() {
        public void run() {

            // Put the file contents into the TextView
            TextView log = (TextView) llLayout.findViewById(R.id.logView);
            log.setText(fixedContents);

            // Auto scroll to the bottom
            final ScrollView scroll = (ScrollView) llLayout.findViewById(R.id.scrollView1);
            scroll.post(new Runnable() {
                public void run() {
                    scroll.fullScroll(View.FOCUS_DOWN);
                }
            });
            if (myDialog != null) {
                myDialog.dismiss();
                myDialog = null;
            }
        }
    });
}

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From source file:org.xdi.util.FileUtil.java

public long findLastPosition(String filePath, String searchStr) {
    try {/*from w  w w  .j a  v  a 2s.co  m*/
        File f = new File(filePath);
        RandomAccessFile raf;
        raf = new RandomAccessFile(f, "r");
        long position = -1;
        while (raf.getFilePointer() < raf.length()) {
            String line = raf.readLine();
            if (line.contains(searchStr)) {
                position = raf.getFilePointer() + line.indexOf(searchStr) - line.length();
                continue;
            }
        }
        return position;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return -1;
    } catch (IOException e) {
        e.printStackTrace();
        return -1;
    }
}

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From source file:org.xdi.util.FileUtil.java

/**
 * returns the first occurrence of specified string in a file.
 * /*  w  ww  .  j  av  a  2s.  c o  m*/
 * @param filePath
 * @param searchStr
 * @return
 */
public long findFirstPosition(String filePath, String searchStr) {
    try {
        File f = new File(filePath);
        RandomAccessFile raf;
        raf = new RandomAccessFile(f, "r");
        long position = -1;
        while (raf.getFilePointer() < raf.length()) {
            String line = raf.readLine();
            if (line.contains(searchStr)) {
                position = raf.getFilePointer() + line.indexOf(searchStr) - (line.length() + 1);
                break;
            }
        }
        return position;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return -1;
    } catch (IOException e) {
        e.printStackTrace();
        return -1;
    }
}

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From source file:com.baidu.terminator.manager.service.LogServiceImpl.java

@Override
public Log readLog(int linkId, long offset) throws IOException {
    String logFileLocation = LinkLogger.getLogFileLocation(linkId);
    FileUtils.createFile(logFileLocation);

    RandomAccessFile raf = null;
    List<String> lines = new ArrayList<String>();
    long length = 0;

    try {/*w w  w  .  ja  v a  2 s.  co m*/
        raf = new RandomAccessFile(logFileLocation, "r");
        raf.seek(offset);
        length = raf.length();

        long point = raf.getFilePointer();
        while (point < length) {
            String line = raf.readLine();
            String utf8Line = new String(line.getBytes("8859_1"), "utf-8");
            lines.add(utf8Line);

            if (point - offset >= MAX_READ_BYTES) {
                length = point;
                break;
            }
            point = raf.getFilePointer();
        }
    } finally {
        if (raf != null) {
            raf.close();
        }
    }

    Log log = new Log();
    log.setLogLocation(logFileLocation);
    log.setOffset(length);
    log.setContent(lines);
    return log;
}

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From source file:mediathekplugin.Database.java

public ArrayList<MediathekProgramItem> getMediathekPrograms(final Program program) {
    ArrayList<MediathekProgramItem> result = new ArrayList<MediathekProgramItem>();
    String channelName = unifyChannelName(program.getChannel().getName());
    HashMap<Long, ArrayList<Integer>> programsMap = mChannelItems.get(channelName);
    // search parts in brackets like for ARD
    if (programsMap == null && channelName.contains("(")) {
        String bracketPart = StringUtils.substringBetween(channelName, "(", ")");
        programsMap = mChannelItems.get(bracketPart);
    }//ww  w. j ava 2s. c o m
    // search for partial name, if full name is not found
    if (programsMap == null && channelName.contains(" ")) {
        String firstPart = StringUtils.substringBefore(channelName, " ");
        programsMap = mChannelItems.get(firstPart);
    }
    if (programsMap == null) {
        for (Entry<String, HashMap<Long, ArrayList<Integer>>> entry : mChannelItems.entrySet()) {
            if (StringUtils.startsWithIgnoreCase(channelName, entry.getKey())) {
                programsMap = entry.getValue();
                break;
            }
        }
    }
    if (programsMap == null) {
        return result;
    }
    String title = program.getTitle();
    ArrayList<Integer> programs = programsMap.get(getKey(title));
    if (programs == null && title.endsWith(")") && title.contains("(")) {
        String newTitle = StringUtils.substringBeforeLast(title, "(").trim();
        programs = programsMap.get(getKey(newTitle));
    }
    if (programs == null && title.endsWith("...")) {
        String newTitle = title.substring(0, title.length() - 3).trim();
        programs = programsMap.get(getKey(newTitle));
    }
    if (programs == null) {
        return result;
    }
    try {
        RandomAccessFile file = new RandomAccessFile(new File(mFileName), "r");
        for (Integer byteOffset : programs) {
            file.seek(byteOffset);
            String lineEncoded = file.readLine();
            String line = new String(lineEncoded.getBytes(), "UTF-8");
            Matcher itemMatcher = ITEM_PATTERN.matcher(line);
            if (itemMatcher.find()) {
                String itemTitle = itemMatcher.group(3).trim();
                String itemUrl = itemMatcher.group(4).trim();
                result.add(new MediathekProgramItem(itemTitle, itemUrl, null));
            }
        }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return result;
}

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From source file:org.xdi.util.FileUtil.java

/**
 * Writes data in a file on specified position
 * //  w w w.j  a  v a  2 s.  com
 * @param filePath
 * @param position
 * @param data
 * @return
 */
public boolean writeToFile(String filePath, long position, String data) {

    try {
        File f = new File(filePath);
        RandomAccessFile raf;
        raf = new RandomAccessFile(f, "rw");
        raf.seek(position);
        StringBuilder dataAfterPostion = new StringBuilder(data);
        while (raf.getFilePointer() < raf.length()) {
            String line = raf.readLine();
            dataAfterPostion.append(line);
        }
        raf.seek(position);
        raf.writeUTF(dataAfterPostion.toString());
        raf.close();
        return true;
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return false;
    } catch (IOException e) {
        e.printStackTrace();
        return false;
    }
}

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