com.hazelcast.projection.impl

Class SingleAttributeProjection<I,O>

java.lang.Object

com.hazelcast.projection.Projection<I,O>

com.hazelcast.projection.impl.SingleAttributeProjection<I,O>

Type Parameters:

I - type of the input

All Implemented Interfaces:

DataSerializable, IdentifiedDataSerializable, Serializable

public final class SingleAttributeProjection<I,O>
extends Projection<I,O>
implements IdentifiedDataSerializable

Projection that extracts the values of the given attribute and returns it.

The attributePath does not support the [any] operator. The input object has to be an instance of Extractable in order for the projection to work.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
SingleAttributeProjection(String attributePath)

Method Summary

Modifier and Type	Method and Description
int	getFactoryId() Returns DataSerializableFactory factory ID for this class.
int	getId() Returns type identifier for this class.
void	readData(ObjectDataInput in) Reads fields from the input stream
O	transform(I input) Transforms the input object into the output object.
void	writeData(ObjectDataOutput out) Writes object fields to output stream

Methods inherited from class java.lang.Object

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

Constructor Detail

SingleAttributeProjection

public SingleAttributeProjection(String attributePath)

Method Detail

transform

public O transform(I input)

Description copied from class: Projection

Transforms the input object into the output object.

Specified by:

transform in class Projection<I,O>

Parameters:

input - object.

Returns:

the output object.

getFactoryId

public int getFactoryId()

Description copied from interface: IdentifiedDataSerializable

Returns DataSerializableFactory factory ID for this class.

Specified by:

getFactoryId in interface IdentifiedDataSerializable

Returns:

factory ID

getId

public int getId()

Description copied from interface: IdentifiedDataSerializable

Returns type identifier for this class. It should be unique per DataSerializableFactory.

Specified by:

getId in interface IdentifiedDataSerializable

Returns:

type ID

writeData

public void writeData(ObjectDataOutput out)
               throws IOException

Description copied from interface: DataSerializable

Writes object fields to output stream

Specified by:

writeData in interface DataSerializable

Parameters:

out - output

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the output stream has been closed.

readData

public void readData(ObjectDataInput in)
              throws IOException

Description copied from interface: DataSerializable

Reads fields from the input stream

Specified by:

readData in interface DataSerializable

Parameters:

in - input

Throws:

IOException - if an I/O error occurs. In particular, an IOException may be thrown if the input stream has been closed.