org.apache.nutch.io
Class MapFile.Writer

java.lang.Object
  org.apache.nutch.io.MapFile.Writer

Direct Known Subclasses:

ArrayFile.Writer, SetFile.Writer

Enclosing class:

MapFile

public static class MapFile.Writer

extends Object

Writes a new map.

Constructor Summary

MapFile.Writer(NutchFileSystem nfs, String dirName, Class keyClass, Class valClass)
Create the named map for keys of the named class.

MapFile.Writer(NutchFileSystem nfs, String dirName, WritableComparator comparator, Class valClass)
Create the named map using the named key comparator.

Method Summary

void	append(WritableComparable key, Writable val) Append a key/value pair to the map.
void	close() Close the map.
int	getIndexInterval() The number of entries that are added before an index entry is added.
void	setIndexInterval(int interval) Sets the index interval.

Methods inherited from class java.lang.Object

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

Constructor Detail

MapFile.Writer

public MapFile.Writer(NutchFileSystem nfs,
                      String dirName,
                      Class keyClass,
                      Class valClass)
               throws IOException

Create the named map for keys of the named class.

MapFile.Writer

public MapFile.Writer(NutchFileSystem nfs,
                      String dirName,
                      WritableComparator comparator,
                      Class valClass)
               throws IOException

Create the named map using the named key comparator.

Method Detail

getIndexInterval

public int getIndexInterval()

The number of entries that are added before an index entry is added.

setIndexInterval

public void setIndexInterval(int interval)

Sets the index interval.

See Also:

getIndexInterval()

close

public void close()
           throws IOException

Close the map.

Throws:

IOException

append

public void append(WritableComparable key,
                   Writable val)
            throws IOException

Append a key/value pair to the map. The key must be strictly greater than the previous key added to the map.

Throws:

IOException