Package com.google.common.io

Class CharSink

  • @GwtIncompatible
public abstract class CharSink
extends java.lang.Object
    A destination to which characters can be written, such as a text file. Unlike a Writer, a CharSink is not an open, stateful stream that can be written to and closed. Instead, it is an immutable supplier of Writer instances.

    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 ByteSink may be viewed as a CharSink with a specific character encoding using ByteSink.asCharSink(Charset). Characters written to the resulting CharSink will written to the ByteSink as encoded bytes.

    Since:
    14.0
    Author:
    Colin Decker

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      protected CharSink()
      Constructor for use by subclasses.

    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      java.io.Writer openBufferedStream()
      Opens a new buffered Writer for writing to this sink.
      abstract java.io.Writer openStream()
      Opens a new Writer for writing to this sink.
      void write​(java.lang.CharSequence charSequence)
      Writes the given character sequence to this sink.
      long writeFrom​(java.lang.Readable readable)
      Writes all the text from the given Readable (such as a Reader) to this sink.
      void writeLines​(java.lang.Iterable<? extends java.lang.CharSequence> lines)
      Writes the given lines of text to this sink with each line (including the last) terminated with the operating system's default line separator.
      void writeLines​(java.lang.Iterable<? extends java.lang.CharSequence> lines, java.lang.String lineSeparator)
      Writes the given lines of text to this sink with each line (including the last) terminated with the given line separator.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • CharSink

        protected CharSink()
        Constructor for use by subclasses.

    • Method Detail

      • openStream

        public abstract java.io.Writer openStream()
                                   throws java.io.IOException
        Opens a new Writer for writing to this sink. This method returns a new, independent writer each time it is called.

        The caller is responsible for ensuring that the returned writer is closed.

        Throws:
        java.io.IOException - if an I/O error occurs while opening the writer

      • openBufferedStream

        public java.io.Writer openBufferedStream()
                                  throws java.io.IOException
        Opens a new buffered Writer for writing to this sink. The returned stream is not required to be a BufferedWriter in order to allow implementations to simply delegate to openStream() when the stream returned by that method does not benefit from additional buffering. This method returns a new, independent writer each time it is called.

        The caller is responsible for ensuring that the returned writer is closed.

        Throws:
        java.io.IOException - if an I/O error occurs while opening the writer
        Since:
        15.0 (in 14.0 with return type BufferedWriter)

      • write

        public void write​(java.lang.CharSequence charSequence)
           throws java.io.IOException
        Writes the given character sequence to this sink.
        Throws:
        java.io.IOException - if an I/O error while writing to this sink

      • writeLines

        public void writeLines​(java.lang.Iterable<? extends java.lang.CharSequence> lines)
                throws java.io.IOException
        Writes the given lines of text to this sink with each line (including the last) terminated with the operating system's default line separator. This method is equivalent to writeLines(lines, System.getProperty("line.separator")).
        Throws:
        java.io.IOException - if an I/O error occurs while writing to this sink

      • writeLines

        public void writeLines​(java.lang.Iterable<? extends java.lang.CharSequence> lines,
                       java.lang.String lineSeparator)
                throws java.io.IOException
        Writes the given lines of text to this sink with each line (including the last) terminated with the given line separator.
        Throws:
        java.io.IOException - if an I/O error occurs while writing to this sink

      • writeFrom

        @CanIgnoreReturnValue
public long writeFrom​(java.lang.Readable readable)
               throws java.io.IOException
        Writes all the text from the given Readable (such as a Reader) to this sink. Does not close readable if it is Closeable.
        Returns:
        the number of characters written
        Throws:
        java.io.IOException - if an I/O error occurs while reading from readable or writing to this sink