org.apache.hadoop.io
Class ArrayWritable
java.lang.Object
org.apache.hadoop.io.ArrayWritable
- All Implemented Interfaces:
- Writable
@InterfaceAudience.Public
@InterfaceStability.Stable
public class ArrayWritable
- extends Object
- implements Writable
A Writable for arrays containing instances of a class. The elements of this
writable must all be instances of the same class. If this writable will be
the input for a Reducer, you will need to create a subclass that sets the
value to be of the proper type.
For example:
public class IntArrayWritable extends ArrayWritable {
public IntArrayWritable() {
super(IntWritable.class);
}
}
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
ArrayWritable
public ArrayWritable(Class<? extends Writable> valueClass)
ArrayWritable
public ArrayWritable(Class<? extends Writable> valueClass,
Writable[] values)
ArrayWritable
public ArrayWritable(String[] strings)
getValueClass
public Class getValueClass()
toStrings
public String[] toStrings()
toArray
public Object toArray()
set
public void set(Writable[] values)
get
public Writable[] get()
readFields
public void readFields(DataInput in)
throws IOException
- Description copied from interface:
Writable
- Deserialize the fields of this object from
in
.
For efficiency, implementations should attempt to re-use storage in the
existing object where possible.
- Specified by:
readFields
in interface Writable
- Parameters:
in
- DataInput
to deseriablize this object from.
- Throws:
IOException
write
public void write(DataOutput out)
throws IOException
- Description copied from interface:
Writable
- Serialize the fields of this object to
out
.
- Specified by:
write
in interface Writable
- Parameters:
out
- DataOuput
to serialize this object into.
- Throws:
IOException
Copyright © 2014 Apache Software Foundation. All Rights Reserved.