Examples of com.google.common.io.CharSource

com.google.common.io.CharSource
A readable source of characters, such as a text file. Unlike a {@link Reader}, a {@code CharSource} is not an open, stateful stream of characters that can be read and closed.Instead, it is an immutable supplier of {@code Reader} instances.
{@code CharSource} provides two kinds of methods:
- Methods that return a reader: These methods should return a new, independent instance each time they are called. The caller is responsible for ensuring that the returned reader is closed.
- Convenience methods: These are implementations of common operations that are typically implemented by opening a reader using one of the methods in the first category, doing something and finally closing the reader that was opened.
Several methods in this class, such as {@link #readLines()}, break the contents of the source into lines. Like {@link BufferedReader}, these methods break lines on any of {@code \n}, {@code \r} or {@code \r\n}, do not include the line separator in each line and do not consider there to be an empty line at the end if the contents are terminated with a line separator.
Any {@link ByteSource} containing text encoded with a specific {@linkplain Charset characterencoding} may be viewed as a {@code CharSource} using {@link ByteSource#asCharSource(Charset)}. @since 14.0 @author Colin Decker


  private Object eval(Reader reader, Context context) throws ScriptException {
    SEXP source;
    try {
      // terminate with '\n'
      CharSource terminated = CharSource.concat(
          newReaderSupplier(reader),
         CharSource.wrap("\n"));
      source = RParser.parseSource(terminated);
    } catch (IOException e) {
      throw new ScriptException(e);

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    eval(reader);
    reader.close();
  }
  
  private CharSource newReaderSupplier(final Reader reader) {
    return new CharSource() {
      @Override
      public Reader openStream() throws IOException {
        return reader;
      }      
    };

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    }


    private Optional<Style> tryLoadSLD(final ByteSource byteSource, final Integer styleIndex) throws IOException {
        Assert.isTrue(styleIndex == null || styleIndex > -1, "styleIndex must be > -1 but was: " + styleIndex);


        final CharSource charSource = byteSource.asCharSource(Constants.DEFAULT_CHARSET);
        BufferedReader reader = null;
        final Style[] styles;
        try {
            reader = charSource.openBufferedStream();


            final SLDParser sldParser = new SLDParser(CommonFactoryFinder.getStyleFactory());
            sldParser.setInput(reader);
            styles = sldParser.readXML();

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        final String geojsonString;
        Closer closer = Closer.create();
        try {
            Reader input;
            if (url.getProtocol().equalsIgnoreCase("file")) {
                final CharSource charSource = Files.asCharSource(new File(url.getFile()), Constants.DEFAULT_CHARSET);
                input = closer.register(charSource.openBufferedStream());
            } else {
                final ClientHttpResponse response = closer.register(this.httpRequestFactory.createRequest(url.toURI(),
                        HttpMethod.GET).execute());


                input = closer.register(new BufferedReader(new InputStreamReader(response.getBody(), Constants.DEFAULT_CHARSET)));

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    }


    public static List<String> runAndParseCommand(boolean failFast, String... command)
            throws Exception {
        runCommand(failFast, command);
        CharSource reader = CharSource.wrap(stdOut.toString(Charsets.UTF_8.name()));
        ImmutableList<String> lines = reader.readLines();
        return lines;
    }

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    }


    private StringBuilder getLimitedOutput(FileBackedOutputStream out, final int limit)
            throws IOException {


        CharSource charSource = out.asByteSource().asCharSource(Charsets.UTF_8);
        BufferedReader reader = charSource.openBufferedStream();
        final StringBuilder output = new StringBuilder();
        int count = 0;
        String line;
        while ((line = reader.readLine()) != null) {
            output.append(line).append('\n');

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    try {
      NetHttpTransport httpTransport = new NetHttpTransport();
      JsonFactory jsonFactory = new JacksonFactory();


      URL url = Resources.getResource(GDrive.class, CLIENTSECRETS_LOCATION);
      CharSource charSource = Resources.asCharSource(url, Charsets.UTF_8);
      Reader reader = charSource.openStream();
      GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(jsonFactory, reader);


      GoogleCredential credential = new GoogleCredential.Builder()
          .setTransport(httpTransport)
          .setJsonFactory(jsonFactory)

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    @Test
    public void whenReadUsingCharSource_thenRead() throws IOException {
        final String expectedValue = "Hello world";
        final File file = new File("src/test/resources/test1.in");


        final CharSource source = Files.asCharSource(file, Charsets.UTF_8);


        final String result = source.read();
        assertEquals(expectedValue, result);
    }

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    public void whenReadMultipleCharSources_thenRead() throws IOException {
        final String expectedValue = "Hello worldTest";
        final File file1 = new File("src/test/resources/test1.in");
        final File file2 = new File("src/test/resources/test1_1.in");


        final CharSource source1 = Files.asCharSource(file1, Charsets.UTF_8);
        final CharSource source2 = Files.asCharSource(file2, Charsets.UTF_8);
        final CharSource source = CharSource.concat(source1, source2);


        final String result = source.read();


        assertEquals(expectedValue, result);
    }

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    try {
      NetHttpTransport httpTransport = new NetHttpTransport();
      JsonFactory jsonFactory = new JacksonFactory();


      URL url = Resources.getResource(GDrive.class, CLIENTSECRETS_LOCATION);
      CharSource charSource = Resources.asCharSource(url, Charsets.UTF_8);
      Reader reader = charSource.openStream();
      GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(jsonFactory, reader);


      GoogleCredential credential = new GoogleCredential.Builder()
          .setTransport(httpTransport)
          .setJsonFactory(jsonFactory)

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