org.apache.ambari.server.serveraction.kerberos

Class AbstractKerberosDataFileWriter

java.lang.Object

org.apache.ambari.server.serveraction.kerberos.AbstractKerberosDataFileWriter

Direct Known Subclasses:

KerberosConfigDataFileWriter, KerberosIdentityDataFileWriter

public abstract class AbstractKerberosDataFileWriter
extends Object

AbstractKerberosDataFileWriter provides a generic facility to write a data file using some underlying record-based file writer.

This class encapsulates a CSVPrinter to create a CSV-formatted file.

Constructor Summary

Constructors

Constructor and Description
AbstractKerberosDataFileWriter(File file) Creates a new KerberosConfigDataFileWriter The file is opened upon creation, so there is no need to manually open it unless manually closed before using.

Method Summary

Modifier and Type	Method and Description
protected void	appendRecord(String... record) Appends a new record to the data file
void	close() Closes the data file
protected abstract Iterable<String>	getHeaderRecord() Gets the header record for the CSV file
boolean	isClosed() Tests this KerberosConfigDataFileWriter to see if the data file is closed.
void	open() Opens the data file for writing.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractKerberosDataFileWriter

public AbstractKerberosDataFileWriter(File file)
                               throws IOException

Creates a new KerberosConfigDataFileWriter

The file is opened upon creation, so there is no need to manually open it unless manually closed before using.

Parameters:

file - a File declaring where to write the data

Throws:

IOException

Method Detail

open

public void open()
          throws IOException

Opens the data file for writing.

This may be called multiple times and the appropriate action will occur depending on if the file has been previously opened or closed.

Throws:

IOException

isClosed

public boolean isClosed()

Tests this KerberosConfigDataFileWriter to see if the data file is closed.

Returns:

true if closed; otherwise false

close

public void close()
           throws IOException

Closes the data file

Throws:

IOException

appendRecord

protected void appendRecord(String... record)
                     throws IOException

Appends a new record to the data file

Parameters:

record - a collection of Strings declaring values for the columns of the file

Throws:

IOException

getHeaderRecord

protected abstract Iterable<String> getHeaderRecord()

Gets the header record for the CSV file

Returns:

an Iterable containing the (ordered) list of Strings declaring the columns names