Examples of com.google.common.io.CharSink

com.google.common.io.CharSink
A destination to which characters can be written, such as a text file. Unlike a {@link Writer}, a {@code CharSink} is not an open, stateful stream that can be written to and closed. Instead, itis an immutable supplier of {@code Writer} instances.
{@code CharSink} provides two kinds of methods:
- Methods that return a writer: These methods should return a new, independent instance each time they are called. The caller is responsible for ensuring that the returned writer is closed.
- Convenience methods: These are implementations of common operations that are typically implemented by opening a writer using one of the methods in the first category, doing something and finally closing the writer that was opened.
Any {@link ByteSink} may be viewed as a {@code CharSink} with a specific {@linkplain Charset character encoding} using {@link ByteSink#asCharSink(Charset)}. Characters written to the resulting {@code CharSink} will written to the {@code ByteSink} as encoded bytes. @since 14.0 @author Colin Decker

         f.deleteOnExit();
         long length = (long) (Runtime.getRuntime().freeMemory() * 1.1);
         
         MessageDigest digester = md5Digest();


         CharSink fileSink = Files.asCharSink(f, Charsets.UTF_8);
         Writer out = null;
         try {
            out = fileSink.openStream();
            for (long i = 0; i < length; i++) {
               out.append('a');
               digester.update((byte) 'a');
            }
            out.flush();

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         f.deleteOnExit();
         long length = (new Random().nextInt(32) + 1) * 1024 * 1024;


         MessageDigest digester = md5Digest();


         CharSink fileSink = Files.asCharSink(f, Charsets.UTF_8);
         Writer out = null;
         try {
            out = fileSink.openStream();
            for (long i = 0; i < length; i++) {
               out.append('a');
               digester.update((byte) 'a');
            }
            out.flush();

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    String directoryId = "0B1fV80wEwsDzalN6Z3VWNVNFSkU"; // folder


    GDirectory directory = drive.directory(directoryId);


    File file = new File("write");
    CharSink charSink = Files.asCharSink(file, Charsets.UTF_8);
    CharSource
        .wrap("write")
        .copyTo(charSink);


    GFile res = directory.write(file);

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         f.deleteOnExit();
         long length = (long) (Runtime.getRuntime().freeMemory() * 1.1);
         
         MessageDigest digester = md5Digest();


         CharSink fileSink = Files.asCharSink(f, Charsets.UTF_8);
         Writer out = null;
         try {
            out = fileSink.openStream();
            for (long i = 0; i < length; i++) {
               out.append('a');
               digester.update((byte) 'a');
            }
            out.flush();

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         f.deleteOnExit();
         long length = (long) (Runtime.getRuntime().freeMemory() * 1.1);
         
         MessageDigest digester = md5Digest();


         CharSink fileSink = Files.asCharSink(f, Charsets.UTF_8);
         Writer out = null;
         try {
            out = fileSink.openStream();
            for (long i = 0; i < length; i++) {
               out.append('a');
               digester.update((byte) 'a');
            }
            out.flush();

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  @Override
  public void setOuter(JUnit4 task) {
    if (outputFile != null) {
      try {
        Files.createParentDirs(outputFile);
        final CharSink charSink;
        if (append) {
          charSink = Files.asCharSink(outputFile, Charsets.UTF_8, FileWriteMode.APPEND);
        } else {
          charSink = Files.asCharSink(outputFile, Charsets.UTF_8);
        }
        this.output = charSink.openBufferedStream();
      } catch (IOException e) {
        throw new BuildException(e);
      }
    } else {
      if (!UNICODE_ENCODINGS.contains(Charset.defaultCharset().name())) {

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    public void givenUsingGuava_whenWritingReaderContentsToFile_thenCorrect() throws IOException {
        final Reader initialReader = new StringReader("Some text");


        final File targetFile = new File("src/test/resources/targetFile.txt");
        com.google.common.io.Files.touch(targetFile);
        final CharSink charSink = com.google.common.io.Files.asCharSink(targetFile, Charset.defaultCharset(), FileWriteMode.APPEND);
        charSink.writeFrom(initialReader);
        initialReader.close();
    }

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    public void givenUsingGuava_whenConvertingByteArrayIntoWriter_thenCorrect() throws IOException {
        final byte[] initialArray = "With Guava".getBytes();


        final String buffer = new String(initialArray);
        final StringWriter stringWriter = new StringWriter();
        final CharSink charSink = new CharSink() {
            @Override
            public final Writer openStream() throws IOException {
                return stringWriter;
            }
        };
        charSink.write(buffer);


        stringWriter.close();
    }

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    @Test
    public void whenWriteUsingCharSink_thenWritten() throws IOException {
        final String expectedValue = "Hello world";
        final File file = new File("src/test/resources/test.out");
        final CharSink sink = Files.asCharSink(file, Charsets.UTF_8);


        sink.write(expectedValue);


        final String result = Files.toString(file, Charsets.UTF_8);
        assertEquals(expectedValue, result);
    }

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    @Test
    public void whenWriteMultipleLinesUsingCharSink_thenWritten() throws IOException {
        final List<String> names = Lists.newArrayList("John", "Jane", "Adam", "Tom");
        final File file = new File("src/test/resources/test.out");
        final CharSink sink = Files.asCharSink(file, Charsets.UTF_8);


        sink.writeLines(names, " ");


        final String result = Files.toString(file, Charsets.UTF_8);
        final String expectedValue = Joiner.on(" ").join(names);
        assertEquals(expectedValue, result.trim());

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