org.gradoop.common.model.impl.properties.strategies

Class NullStrategy

java.lang.Object

org.gradoop.common.model.impl.properties.strategies.NullStrategy

All Implemented Interfaces:

PropertyValueStrategy

public class NullStrategy
extends Object
implements PropertyValueStrategy

Strategy class for handling PropertyValue operations when the value is null.

Constructor Summary

Constructors

Constructor and Description
NullStrategy()

Method Summary

Modifier and Type	Method and Description
int	compare(Object value, Object other) Compares two objects.
Object	get(byte[] bytes) Deserializes an object from the provided byte array.
byte[]	getRawBytes(Object value) Serializes the given object.
byte	getRawType() Gets a byte which represents the data type the specific strategy handles.
Class<?>	getType() Gets the class of the data type the specific strategy handles.
boolean	is(Object value) Checks if given object is an instance of the data type the specific strategy handles.
Object	read(org.apache.flink.core.memory.DataInputView inputView, byte typeByte) Reads raw bytes from the given DataInputView and deserializes the contained object.
void	write(Object value, org.apache.flink.core.memory.DataOutputView outputView) Writes the given value to the provided DataOutputView.

Methods inherited from class java.lang.Object

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

Constructor Detail

NullStrategy

public NullStrategy()

Method Detail

write

public void write(Object value,
                  org.apache.flink.core.memory.DataOutputView outputView)
           throws IOException

Description copied from interface: PropertyValueStrategy

Writes the given value to the provided DataOutputView. The argument value can not be null.

Specified by:

write in interface PropertyValueStrategy

Parameters:

value - to be written to the DataOutputView.

outputView - that the value is written to.

Throws:

IOException - if write process fails.

read

public Object read(org.apache.flink.core.memory.DataInputView inputView,
                   byte typeByte)
            throws IOException

Description copied from interface: PropertyValueStrategy

Reads raw bytes from the given DataInputView and deserializes the contained object.

Specified by:

read in interface PropertyValueStrategy

Parameters:

inputView - containing serialized object.

typeByte - byte needed to indicate whether serialized object has a variable length.

Returns:

deserialized object.

Throws:

IOException - when reading or deserialization of the object fails.

compare

public int compare(Object value,
                   Object other)

Description copied from interface: PropertyValueStrategy

Compares two objects.

Specified by:

compare in interface PropertyValueStrategy

Parameters:

value - first object.

other - second object.

Returns:

a negative integer, zero, or a positive integer as first object is less than, equal to, or greater than the second object.

is

public boolean is(Object value)

Description copied from interface: PropertyValueStrategy

Checks if given object is an instance of the data type the specific strategy handles.

Specified by:

is in interface PropertyValueStrategy

Parameters:

value - to be checked.

Returns:

true if value is an instance of the data type this strategy handles. False otherwise.

getType

public Class<?> getType()

Description copied from interface: PropertyValueStrategy

Gets the class of the data type the specific strategy handles.

Specified by:

getType in interface PropertyValueStrategy

Returns:

class of the type handled by this strategy.

get

public Object get(byte[] bytes)

Description copied from interface: PropertyValueStrategy

Deserializes an object from the provided byte array.

Specified by:

get in interface PropertyValueStrategy

Parameters:

bytes - representing a serialized object.

Returns:

an instance of the type handled by this strategy.

getRawType

public byte getRawType()

Description copied from interface: PropertyValueStrategy

Gets a byte which represents the data type the specific strategy handles.

Specified by:

getRawType in interface PropertyValueStrategy

Returns:

a byte.

getRawBytes

public byte[] getRawBytes(Object value)

Description copied from interface: PropertyValueStrategy

Serializes the given object. The argument value can not be null.

Specified by:

getRawBytes in interface PropertyValueStrategy

Parameters:

value - the object to be serialized.

Returns:

byte array representation of the provided object.