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java.lang.Objectorg.apache.hadoop.io.MapFile.Reader
org.apache.hadoop.io.ArrayFile.Reader
public static class ArrayFile.Reader
Provide access to an existing array file.
| Constructor Summary | |
|---|---|
ArrayFile.Reader(FileSystem fs,
String file,
Configuration conf)
Construct an array reader for the named file. |
|
| Method Summary | |
|---|---|
Writable |
get(long n,
Writable value)
Return the nth value in the file. |
long |
key()
Returns the key associated with the most recent call to seek(long), next(Writable), or get(long,Writable). |
Writable |
next(Writable value)
Read and return the next value in the file. |
void |
seek(long n)
Positions the reader before its nth value. |
| Methods inherited from class org.apache.hadoop.io.MapFile.Reader |
|---|
close, createDataFileReader, finalKey, get, getClosest, getClosest, getKeyClass, getValueClass, midKey, next, open, reset, seek |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public ArrayFile.Reader(FileSystem fs,
String file,
Configuration conf)
throws IOException
IOException| Method Detail |
|---|
public void seek(long n)
throws IOException
nth value.
IOException
public Writable next(Writable value)
throws IOException
IOException
public long key()
throws IOException
seek(long), next(Writable), or get(long,Writable).
IOException
public Writable get(long n,
Writable value)
throws IOException
nth value in the file.
IOException
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