com.ibm.as400.access
Class IFSFileWriter

java.lang.Object
  java.io.Writer
      com.ibm.as400.access.IFSFileWriter

All Implemented Interfaces:

Closeable, Flushable, Appendable

public class IFSFileWriter
extends Writer

Convenience class for writing character files in the integrated file system. The behavior of this class is comparable to java.io.FileWriter.
IFSFileWriter is meant for writing streams of characters. For writing streams of raw bytes, use IFSFileOutputStream. If an OutputStream is required, use IFSTextFileOutputStream.

The following example illustrates the use of IFSFileWriter:

import java.io.PrintWriter;
import java.io.BufferedWriter;
// Work with /File1 on the system eniac.
AS400 as400 = new AS400("eniac");
IFSFile file = new IFSFile(system, "/File1");
PrintWriter writer = new PrintWriter(new BufferedWriter(new IFSFileWriter(file)));
// Write a line of text to the file, converting characters.
writer.println(text);
// Close the file.
writer.close();

Field Summary

Modifier and Type	Field and Description
static int	SHARE_ALL Share option that allows read and write access by other users.
static int	SHARE_NONE Share option that does not allow read or write access by other users.
static int	SHARE_READERS Share option that allows only read access by other users.
static int	SHARE_WRITERS Share option that allows only write access by other users.

Fields inherited from class java.io.Writer

lock

Constructor and Description

IFSFileWriter(IFSFile file)
Constructs an IFSFileWriter object.

IFSFileWriter(IFSFile file, boolean append)
Constructs an IFSFileWriter object.

IFSFileWriter(IFSFile file, boolean append, int shareOption)
Constructs an IFSFileWriter object.

IFSFileWriter(IFSFile file, boolean append, int shareOption, int ccsid)
Constructs an IFSFileWriter object.

IFSFileWriter(IFSFileDescriptor fd)
Constructs an IFSFileWriter object.

IFSFileWriter(IFSFile file, int ccsid)
Constructs an IFSFileWriter object.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the stream, flushing it first.
void	flush() Flushes the underlying output stream.
int	getCCSID() Returns the CCSID used by this IFSFileWriter.
String	getEncoding() Returns the encoding used by this IFSFileWriter.
IFSKey	lockBytes(int length) Deprecated. Replaced by lock(long)
IFSKey	lockBytes(long length) Places a lock on the file at the current position for the specified number of bytes.
void	unlockBytes(IFSKey key) Undoes a lock on the file.
void	write(char[] buffer) Writes the specified array of characters.
void	write(char[] buffer, int offset, int length) Writes a portion of an array of characters.
void	write(int c) Writes a single character.
void	write(String data) Writes a String.
void	write(String data, int offset, int length) Writes a portion of a String.

Methods inherited from class java.io.Writer

append, append, append, append, append, append

Methods inherited from class java.lang.Object

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

Field Detail

SHARE_ALL

public static final int SHARE_ALL

Share option that allows read and write access by other users.

See Also:

Constant Field Values

SHARE_NONE

public static final int SHARE_NONE

Share option that does not allow read or write access by other users.

See Also:

Constant Field Values

SHARE_READERS

public static final int SHARE_READERS

Share option that allows only read access by other users.

See Also:

Constant Field Values

SHARE_WRITERS

public static final int SHARE_WRITERS

Share option that allows only write access by other users.

See Also:

Constant Field Values

Constructor Detail

IFSFileWriter

public IFSFileWriter(IFSFile file)
              throws AS400SecurityException,
                     IOException

Constructs an IFSFileWriter object. Other readers and writers are allowed to access the file. The file is opened if it exists; otherwise an exception is thrown. The file's CCSID is obtained by referencing the file's "coded character set ID" tag on the system. Any data currently in the file will be overwritten. Other readers and writers are allowed to access the file.

Parameters:

file - The file to be opened for writing.

Throws:

AS400SecurityException - If a security or authority error occurs.

IOException - If an error occurs while communicating with the system.

See Also:

IFSFile.createNewFile()

IFSFileWriter

public IFSFileWriter(IFSFile file,
                     int ccsid)
              throws AS400SecurityException,
                     IOException

Constructs an IFSFileWriter object. The file is opened if it exists; otherwise an exception is thrown. Any data currently in the file will be overwritten. Other readers and writers are allowed to access the file.

Parameters:

file - The file to be opened for writing.

ccsid - The CCSID to convert the data to when writing to the file. The file's "data CCSID" tag on the system is not changed.

Throws:

AS400SecurityException - If a security or authority error occurs.

IOException - If an error occurs while communicating with the system.

See Also:

IFSFile.createNewFile()

IFSFileWriter

public IFSFileWriter(IFSFile file,
                     boolean append)
              throws AS400SecurityException,
                     IOException

Constructs an IFSFileWriter object. The file is opened if it exists; otherwise an exception is thrown. The file's CCSID is obtained by referencing the file's "coded character set ID" tag on the system. Other readers and writers are allowed to access the file.

Parameters:

file - The file to be opened for writing.

append - If true, output is appended to the file; otherwise, any data currently in the file will be overwritten.

Throws:

AS400SecurityException - If a security or authority error occurs.

IOException - If an error occurs while communicating with the system.

See Also:

IFSFile.createNewFile()

IFSFileWriter

public IFSFileWriter(IFSFile file,
                     boolean append,
                     int shareOption)
              throws AS400SecurityException,
                     IOException

Constructs an IFSFileWriter object. The file is opened if it exists; otherwise an exception is thrown. The file's CCSID is obtained by referencing the file's "coded character set ID" tag on the system.

Parameters:

file - The file to be opened for writing.

append - If true, output is appended to the file; otherwise, any data currently in the file will be overwritten.

shareOption - Indicates how users can access the file.

• SHARE_ALL Share access with readers and writers
• SHARE_NONE Share access with none
• SHARE_READERS Share access with readers
• SHARE_WRITERS Share access with writers

Throws:

AS400SecurityException - If a security or authority error occurs.

IOException - If an error occurs while communicating with the system.

See Also:

IFSFile.createNewFile()

IFSFileWriter

public IFSFileWriter(IFSFile file,
                     boolean append,
                     int shareOption,
                     int ccsid)
              throws AS400SecurityException,
                     IOException

Constructs an IFSFileWriter object. The file is opened if it exists; otherwise an exception may be thrown.

Parameters:

file - The file to be opened for writing.

append - If true, output is appended to the file; otherwise, any data currently in the file will be overwritten.

shareOption - Indicates how users can access the file.

• SHARE_ALL Share access with readers and writers
• SHARE_NONE Share access with none
• SHARE_READERS Share access with readers
• SHARE_WRITERS Share access with writers

ccsid - The CCSID to convert the data to when writing to the file. The file's "data CCSID" tag on the system is not changed.

Throws:

AS400SecurityException - If a security or authority error occurs.

IOException - If an error occurs while communicating with the system.

See Also:

IFSFile.createNewFile()

IFSFileWriter

public IFSFileWriter(IFSFileDescriptor fd)
              throws AS400SecurityException,
                     IOException

Constructs an IFSFileWriter object. The file is opened if it exists; otherwise an exception is thrown.

Parameters:

fd - The file descriptor to be opened for writing.

Throws:

AS400SecurityException - If a security or authority error occurs.

IOException - If an error occurs while communicating with the system.

See Also:

IFSFile.createNewFile()

Method Detail

close

public void close()
           throws IOException

Closes 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.

Specified by:

close in interface Closeable

Specified by:

close in class Writer

Throws:

IOException - If an error occurs while communicating with the system.

flush

public void flush()
           throws IOException

Flushes the underlying output stream.

Specified by:

flush in interface Flushable

Specified by:

flush in class Writer

Throws:

IOException - If an error occurs while communicating with the system.

getCCSID

public int getCCSID()

Returns the CCSID used by this IFSFileWriter.

Returns:

The CCSID, or -1 if the CCSID is not known.

getEncoding

public String getEncoding()

Returns the encoding used by this IFSFileWriter.

Returns:

The encoding, or null if the encoding is not known.

lockBytes

public IFSKey lockBytes(int length)
                 throws IOException

Deprecated. Replaced by lock(long)

Places a lock on the file at the current position for the specified number of bytes. Note: This method is not supported for files under QSYS.

Parameters:

length - The number of bytes to lock.

Returns:

The key for undoing this lock.

Throws:

IOException - If an error occurs while communicating with the system.

See Also:

unlockBytes(com.ibm.as400.access.IFSKey)

lockBytes

public IFSKey lockBytes(long length)
                 throws IOException

Places a lock on the file at the current position for the specified number of bytes. Note: This method is not supported for files under QSYS.

Parameters:

length - The number of bytes to lock.

Returns:

The key for undoing this lock.

Throws:

IOException - If an error occurs while communicating with the system.

See Also:

unlockBytes(com.ibm.as400.access.IFSKey)

unlockBytes

public void unlockBytes(IFSKey key)
                 throws IOException

Undoes a lock on the file. Note: This method is not supported for files under QSYS.

Parameters:

key - The key for the lock.

Throws:

IOException - If an error occurs while communicating with the system.

See Also:

lockBytes(long)

write

public void write(int c)
           throws IOException

Writes a single character.

Overrides:

write in class Writer

Parameters:

c - int specifying a character to be written.

Throws:

IOException - If an error occurs while communicating with the system.

write

public void write(char[] buffer)
           throws IOException

Writes the specified array of characters.

Overrides:

write in class Writer

Parameters:

buffer - The characters to be written.

Throws:

IOException - If an error occurs while communicating with the system.

write

public void write(char[] buffer,
                  int offset,
                  int length)
           throws IOException

Writes a portion of an array of characters.

Specified by:

write in class Writer

Parameters:

buffer - The characters to be written.

offset - The offset into the array from which to begin extracting characters to write.

length - The number of characters to write.

Throws:

IOException - If an error occurs while communicating with the system.

write

public void write(String data)
           throws IOException

Writes a String.

Overrides:

write in class Writer

Parameters:

data - The String to write.

Throws:

IOException - If an error occurs while communicating with the system.

write

public void write(String data,
                  int offset,
                  int length)
           throws IOException

Writes a portion of a String.

Overrides:

write in class Writer

Parameters:

data - The String to write.

offset - The offset into the String from which to begin extracting characters to write.

length - The number of characters to write.

Throws:

IOException - If an error occurs while communicating with the system.