Package com.google.common.io

Class CharSink

java.lang.Object

com.google.common.io.CharSink

@GwtIncompatible
public abstract class CharSink
extends 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

Modifier and Type	Method	Description
Writer	openBufferedStream()	Opens a new buffered Writer for writing to this sink.
abstract Writer	openStream()	Opens a new Writer for writing to this sink.
void	write(CharSequence charSequence)	Writes the given character sequence to this sink.
long	writeFrom(Readable readable)	Writes all the text from the given Readable (such as a Reader) to this sink.
void	writeLines(Iterable<? extends 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(Iterable<? extends CharSequence> lines, 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 Writer openStream()
                           throws 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:

IOException - if an I/O error occurs while opening the writer

openBufferedStream

public Writer openBufferedStream()
                          throws 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:

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(CharSequence charSequence)
           throws IOException

Writes the given character sequence to this sink.

Throws:

IOException - if an I/O error while writing to this sink

writeLines

public void writeLines(Iterable<? extends CharSequence> lines)
                throws 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:

IOException - if an I/O error occurs while writing to this sink

writeLines

public void writeLines(Iterable<? extends CharSequence> lines,
                       String lineSeparator)
                throws IOException

Writes the given lines of text to this sink with each line (including the last) terminated with the given line separator.

Throws:

IOException - if an I/O error occurs while writing to this sink

writeFrom

@CanIgnoreReturnValue
public long writeFrom(Readable readable)
               throws 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:

IOException - if an I/O error occurs while reading from readable or writing to this sink