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The Open Source version of the IBM Toolbox for Java
///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename: IFSTextFileInputStream.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2004 International Business Machines Corporation and
// others. All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////
package com.ibm.as400.access;
import java.io.IOException;
import java.io.InputStreamReader;
/**
Represents an integrated file system input stream for character data.
IFSTextFileInputStream objects are capable of generating file events
which call the following FileListener methods: fileClosed and fileOpened.
Note: This class is provided for situations where an InputStream is required. The preferred method of reading a text file is via {@link IFSFileReader IFSFileReader}.
The following example illustrates the use of IFSTextFileInputStream:
// Work with /File on the system eniac.
AS400 as400 = new AS400("eniac");
IFSTextFileInputStream file = new IFSTextFileInputStream(as400, "/File");
// Read the first four characters of the file.
String s = file.read(4);
// Display the characters read.
System.out.println(s);
// Close the file.
file.close();
@see com.ibm.as400.access.FileEvent
@see com.ibm.as400.access.IFSFileInputStream#addFileListener
@see com.ibm.as400.access.IFSFileInputStream#removeFileListener
**/
public class IFSTextFileInputStream extends IFSFileInputStream
implements java.io.Serializable
{
static final long serialVersionUID = 4L;
/**
Constructs an IFSTextFileInputStream object.
**/
public IFSTextFileInputStream()
{
super();
}
/**
Constructs an IFSTextFileInputStream object.
It creates a file input stream to read from the text file name.
Other readers and writers are allowed to access the file. The file is
opened if it exists; otherwise an exception is thrown.
@param system The AS400 that contains the file.
@param name The integrated file system name.
@exception AS400SecurityException If a security or authority error occurs.
@exception IOException If an error occurs while communicating with the system.
**/
public IFSTextFileInputStream(AS400 system,
String name)
throws AS400SecurityException, IOException
{
super(system, name);
}
/**
Constructs an IFSTextFileInputStream object.
It creates a file input stream to read from the text file name.
@param system The AS400 that contains the file.
@param name The integrated file system name.
@param 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
@exception AS400SecurityException If a security or authority error occurs.
@exception IOException If an error occurs while communicating with the system.
**/
public IFSTextFileInputStream(AS400 system,
String name,
int shareOption)
throws AS400SecurityException, IOException
{
super(system, name, shareOption);
}
// @A5a
/**
Constructs an IFSTextFileInputStream object.
It creates a file input stream to read from the text file specified by file.
Other readers and writers are allowed to access the file. The file is
opened if it exists; otherwise an exception is thrown.
@param file The file to be opened for reading.
@exception AS400SecurityException If a security or authority error occurs.
@exception IOException If an error occurs while communicating with the system.
**/
public IFSTextFileInputStream(IFSFile file)
throws AS400SecurityException, IOException
{
super(file);
}
/**
Constructs an IFSTextFileInputStream object.
It creates a file input stream to read from the text file specified by file.
@param system The AS400 that contains the file.
@param file The file to be opened for reading.
@param 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
@exception AS400SecurityException If a security or authority error occurs.
@exception IOException If an error occurs while communicating with the system.
**/
public IFSTextFileInputStream(AS400 system,
IFSFile file,
int shareOption)
throws AS400SecurityException, IOException
{
super(system, file, shareOption);
}
// @A5a
/**
Constructs an IFSTextFileInputStream object.
It creates a file input stream to read from the text file specified by file.
Other readers and writers are allowed to access the file. The file is
opened if it exists; otherwise an exception is thrown.
@param file The file to be opened for reading.
@exception AS400SecurityException If a security or authority error occurs.
@exception IOException If an error occurs while communicating with the system.
**/
public IFSTextFileInputStream(IFSJavaFile file)
throws AS400SecurityException, IOException
{
super(file);
}
// @A2A
/**
Constructs an IFSTextFileInputStream object.
It creates a file input stream to read from the text file specified by file.
@param system The AS400 that contains the file.
@param file The file to be opened for reading.
@param 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
@exception AS400SecurityException If a security or authority error occurs.
@exception IOException If an error occurs while communicating with the system.
**/
public IFSTextFileInputStream(AS400 system,
IFSJavaFile file,
int shareOption)
throws AS400SecurityException, IOException
{
super(system, file, shareOption);
}
/**
Constructs an IFSTextFileInputStream object.
It creates a text file input stream to read from file descriptor fd.
@param fd The file descriptor to be opened for reading.
**/
public IFSTextFileInputStream(IFSFileDescriptor fd)
{
super(fd);
}
/**
Returns the implementation object.
@return The implementation object associated with this stream.
**/
IFSFileInputStreamImpl getImpl()
{
return super.getImpl(); // Note: This may be null.
}
/**
Reads up to length characters from this text file input stream.
The file contents are converted from the file data CCSID to Unicode if
the encoding is supported.
@param length The number of characters to read from the stream.
@return The characters read from the stream. If the end of file has been
reached an empty String is returned.
@exception IOException If an error occurs while communicating with the system.
**/
public String read(int length)
throws IOException
{
String data = "";
// Validate length.
if (length < 0)
{
throw new ExtendedIllegalArgumentException("length (" +
Integer.toString(length) +
")",
ExtendedIllegalArgumentException.LENGTH_NOT_VALID);
}
else if (length == 0)
{
return "";
}
else
{
// Ensure that the file is open.
open();
return impl_.readText(length);
}
}
}