Package org.apache.hadoop.io

Class ArrayPrimitiveWritable

java.lang.Object
org.apache.hadoop.io.ArrayPrimitiveWritable
All Implemented Interfaces:
Writable
@Public @Stable public class ArrayPrimitiveWritable extends Object implements Writable
This is a wrapper class. It wraps a Writable implementation around an array of primitives (e.g., int[], long[], etc.), with optimized wire format, and without creating new objects per element. This is a wrapper class only; it does not make a copy of the underlying array.

  • Constructor Details

    • ArrayPrimitiveWritable

      public ArrayPrimitiveWritable()
      Construct an empty instance, for use during Writable read

    • ArrayPrimitiveWritable

      public ArrayPrimitiveWritable(Class<?> componentType)
      Construct an instance of known type but no value yet for use with type-specific wrapper classes.
      Parameters:
      componentType - componentType.

    • ArrayPrimitiveWritable

      public ArrayPrimitiveWritable(Object value)
      Wrap an existing array of primitives
      Parameters:
      value - - array of primitives

  • Method Details

    • get

      public Object get()
      Get the original array. Client must cast it back to type componentType[] (or may use type-specific wrapper classes).
      Returns:
      - original array as Object

    • getComponentType

      public Class<?> getComponentType()

    • getDeclaredComponentType

      public Class<?> getDeclaredComponentType()

    • isDeclaredComponentType

      public boolean isDeclaredComponentType(Class<?> componentType)

    • set

      public void set(Object value)

    • 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 - any other problem for write.

    • 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 - any other problem for readFields.