org.apache.ambari.server.serveraction.kerberos

Class AbstractKerberosDataFileReader

java.lang.Object

org.apache.ambari.server.serveraction.kerberos.AbstractKerberosDataFileReader

All Implemented Interfaces:

Iterable<Map<String,String>>

Direct Known Subclasses:

KerberosConfigDataFileReader, KerberosIdentityDataFileReader

public abstract class AbstractKerberosDataFileReader
extends Object
implements Iterable<Map<String,String>>

AbstractKerberosDataFileReader implements common code to read existing Kerberos data files.

This class encapsulates a CSVParser to read a CSV-formatted file.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractKerberosDataFileReader(File file) Creates a new AbstractKerberosDataFileReader 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
void	close()
boolean	isClosed() Tests this AbstractKerberosDataFileReader to see if the data file is closed.
Iterator<Map<String,String>>	iterator() Gets an iterator to use to access the records in the data file.
void	open() Opens the data file for reading.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

AbstractKerberosDataFileReader

protected AbstractKerberosDataFileReader(File file)
                                  throws IOException

Creates a new AbstractKerberosDataFileReader

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 reading.

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 - if an error occurs while accessing the file

isClosed

public boolean isClosed()

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

Returns:

true if closed; otherwise false

close

public void close()
           throws IOException

Throws:

IOException

iterator

public Iterator<Map<String,String>> iterator()

Gets an iterator to use to access the records in the data file.

Each item is a Map of column names to values.

Specified by:

iterator in interface Iterable<Map<String,String>>

Returns:

an Iterator of records from the data file, each record is represented as a Map of column name (String) to column value (String)