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

Class PropertyValueStrategyFactory

java.lang.Object

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

public class PropertyValueStrategyFactory
extends Object

Factory class responsible for instantiating strategy classes that manage every kind of access to the current PropertyValue value.

Method Summary

Modifier and Type	Method and Description
static int	compare(Object value, Object other) Compares two values. PropertyValue.NULL_VALUE is considered to be less than all other properties.
static Object	fromRawBytes(byte[] bytes) Returns value which is represented by the the provided byte array.
static PropertyValueStrategy	get(byte value) Returns strategy mapping to the provided byte value.
static PropertyValueStrategy	get(Class clazz) Get a strategy which corresponds the provided class.
static PropertyValueStrategy	get(Object value) Get strategy by object.
static byte[]	getRawBytes(Object value) Get byte array representation of the provided object.

Methods inherited from class java.lang.Object

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

Method Detail

fromRawBytes

public static Object fromRawBytes(byte[] bytes)

Returns value which is represented by the the provided byte array. Assumes that the value is serialized according to the PropertyValue standard.

Parameters:

bytes - byte array of raw bytes.

Returns:

Object which is the result of the deserialization.

compare

public static int compare(Object value,
                          Object other)

Compares two values.
PropertyValue.NULL_VALUE is considered to be less than all other properties.

If other is not comparable to value, the used PropertyValueStrategy will throw an IllegalArgumentException. This behavior violates the requirements of Comparable.compareTo(T).

Parameters:

value - first value.

other - second value.

Returns:

a negative integer, zero, or a positive integer as value is less than, equal to, or greater than other.

getRawBytes

public static byte[] getRawBytes(Object value)

Get byte array representation of the provided object. The object is serialized according to the PropertyValue standard. If the given type is not supported, an UnsupportedTypeException will be thrown.

Parameters:

value - to be serialized.

Returns:

byte array representation of the provided object.

get

public static PropertyValueStrategy get(byte value)
                                 throws UnsupportedTypeException

Returns strategy mapping to the provided byte value.

Parameters:

value - representing a data type.

Returns:

strategy class.

Throws:

UnsupportedTypeException - when there is no matching strategy for a given type byte.

get

public static PropertyValueStrategy get(Class clazz)
                                 throws UnsupportedTypeException

Get a strategy which corresponds the provided class. If there is no mapping for the provided class in the class-strategy map, or the value of the parameter is null, an instance of NullStrategy is returned.

Parameters:

clazz - some class

Returns:

strategy class which is able to handle the provided type.

Throws:

UnsupportedTypeException - when there is no matching strategy for the given class.

get

public static PropertyValueStrategy get(Object value)
                                 throws UnsupportedTypeException

Get strategy by object.

Parameters:

value - some object.

Returns:

strategy that handles operations on the provided object type. If value is null, NullStrategy is returned.

Throws:

UnsupportedTypeException - when there is no matching strategy for a given object.