Package org.apache.hadoop.hdfs.tools.offlineEditsViewer

Class XmlEditsVisitor

java.lang.Object

org.apache.hadoop.hdfs.tools.offlineEditsViewer.XmlEditsVisitor

All Implemented Interfaces:

OfflineEditsVisitor

@Private
@Unstable
public class XmlEditsVisitor
extends Object
implements OfflineEditsVisitor

An XmlEditsVisitor walks over an EditLog structure and writes out an equivalent XML document that contains the EditLog's components.

Constructor Summary

Constructors

Constructor	Description
XmlEditsVisitor(OutputStream out)	Create a processor that writes to the file named and may or may not also output to the screen, as specified.

Method Summary

Modifier and Type	Method	Description
void	addString(String str)
void	close(Throwable error)	Finish visitor
void	start(int version)	Start visitor (initialization)
void	visitOp(FSEditLogOp op)	Begin visiting an element that encloses another element, such as the beginning of the list of blocks that comprise a file.

Methods inherited from class java.lang.Object

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

Constructor Details

XmlEditsVisitor

public XmlEditsVisitor(OutputStream out)
                throws IOException

Create a processor that writes to the file named and may or may not also output to the screen, as specified.

Parameters:

out - output stream to write

Throws:

IOException - on any error

Method Details

start

public void start(int version)
           throws IOException

Start visitor (initialization)

Specified by:

start in interface OfflineEditsVisitor

Parameters:

version - Edit log version

Throws:

IOException

addString

public void addString(String str)
               throws SAXException

Throws:

SAXException

close

public void close(Throwable error)
           throws IOException

Finish visitor

Specified by:

close in interface OfflineEditsVisitor

Parameters:

error - If the visitor was closed because of an unrecoverable error in the input stream, this is the exception.

Throws:

IOException

visitOp

public void visitOp(FSEditLogOp op)
             throws IOException

Description copied from interface: OfflineEditsVisitor

Begin visiting an element that encloses another element, such as the beginning of the list of blocks that comprise a file.

Specified by:

visitOp in interface OfflineEditsVisitor

Parameters:

op - Token being visited

Throws:

IOException