java.io.Writer Maven / Gradle / Ivy
/*
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documentation, such as a unified set of documents of API signatures for
a platform that includes technologies expressed as Java APIs. The file
may also be used to produce "compilation stubs," which allow
applications to be compiled and validated for such platforms.
Any work generated from this file, such as unified javadocs or compiled
stub files, must be accompanied by this notice in its entirety.
This work corresponds to the API signatures of JSR 219: Foundation
Profile 1.1. In the event of a discrepency between this work and the
JSR 219 specification, which is available at
http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence.
*/
package java.io;
/**
* Abstract class for writing to character streams. The only methods that a
* subclass must implement are write(char[], int, int), flush(), and close().
* Most subclasses, however, will override some of the methods defined here in
* order to provide higher efficiency, additional functionality, or both.
*
* @see Writer
* @see BufferedWriter
* @see CharArrayWriter
* @see FilterWriter
* @see OutputStreamWriter
* @see FileWriter
* @see PipedWriter
* @see PrintWriter
* @see Reader
*
* @version 1.20, 00/05/03
* @author Mark Reinhold
* @since JDK1.1
*/
public abstract class Writer
{
/**
* The object used to synchronize operations on this stream. For
* efficiency, a character-stream object may use an object other than
* itself to protect critical sections. A subclass should therefore use
* the object in this field rather than this or a synchronized
* method.
*/
protected Object lock;
/**
* Create a new character-stream writer whose critical sections will
* synchronize on the writer itself.
*/
protected Writer() { }
/**
* Create a new character-stream writer whose critical sections will
* synchronize on the given object.
*
* @param lock Object to synchronize on.
*/
protected Writer(Object lock) { }
/**
* Write a single character. The character to be written is contained in
* the 16 low-order bits of the given integer value; the 16 high-order bits
* are ignored.
*
*
Subclasses that intend to support efficient single-character output
* should override this method.
*
* @param c int specifying a character to be written.
* @exception IOException If an I/O error occurs
*/
public void write(int c) throws IOException { }
/**
* Write an array of characters.
*
* @param cbuf Array of characters to be written
*
* @exception IOException If an I/O error occurs
*/
public void write(char[] cbuf) throws IOException { }
/**
* Write a portion of an array of characters.
*
* @param cbuf Array of characters
* @param off Offset from which to start writing characters
* @param len Number of characters to write
*
* @exception IOException If an I/O error occurs
*/
public abstract void write(char[] cbuf, int off, int len)
throws IOException;
/**
* Write a string.
*
* @param str String to be written
*
* @exception IOException If an I/O error occurs
*/
public void write(String str) throws IOException { }
/**
* Write a portion of a string.
*
* @param str A String
* @param off Offset from which to start writing characters
* @param len Number of characters to write
*
* @exception IOException If an I/O error occurs
*/
public void write(String str, int off, int len) throws IOException { }
/**
* Flush the stream. If the stream has saved any characters from the
* various write() methods in a buffer, write them immediately to their
* intended destination. Then, if that destination is another character or
* byte stream, flush it. Thus one flush() invocation will flush all the
* buffers in a chain of Writers and OutputStreams.
*
* @exception IOException If an I/O error occurs
*/
public abstract void flush() throws IOException;
/**
* Close the stream, flushing it first. Once a stream has been closed,
* further write() or flush() invocations will cause an IOException to be
* thrown. Closing a previously-closed stream, however, has no effect.
*
* @exception IOException If an I/O error occurs
*/
public abstract void close() throws IOException;
}