me.prettyprint.hom

Class HectorObjectMapper

java.lang.Object

me.prettyprint.hom.HectorObjectMapper

Type Parameters:

T - Type of object mapping to cassandra row

public class HectorObjectMapper
extends Object

Maps a slice of HColumns to an object's properties. See #createObject(Object, ColumnSlice) for more details.

As mentioned above all column names must be Strings - doesn't really make sense to have other types when mapping to object properties.

Author:

Todd Burruss

Constructor Summary

Constructors

Constructor and Description
HectorObjectMapper(ClassCacheMgr cacheMgr)

Method Summary

Methods

Modifier and Type	Method and Description
static Serializer<?>	determineSerializer(Class<?> theType)
<T,I> T	getObject(Keyspace keyspace, String colFamName, I pkObj) Retrieve columns from cassandra keyspace and column family, instantiate a new object of required type, and then map them to the object's properties.
static boolean	isImplementedBy(Class<?> clazz, Class<?> target)
static boolean	isSerializable(Class<?> clazz)
<T> T	saveObj(Keyspace keyspace, T obj)
Collection<?>	saveObjCollection(Keyspace keyspace, Collection<?> objColl) Persists the object collection using a single batch mutate.
Collection<?>	saveObjCollection(Keyspace keyspace, Collection<?> objColl, Mutator<byte[]> m)
void	setKeyConcatStrategy(KeyConcatenationStrategy keyConcatStrategy)

Methods inherited from class java.lang.Object

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

Constructor Detail

HectorObjectMapper

public HectorObjectMapper(ClassCacheMgr cacheMgr)

Method Detail

getObject

public <T,I> T getObject(Keyspace keyspace,
                String colFamName,
                I pkObj)

Retrieve columns from cassandra keyspace and column family, instantiate a new object of required type, and then map them to the object's properties.

Type Parameters:

T -

Parameters:

keyspace -

colFamName -

pkObj -

Returns:

saveObj

public <T> T saveObj(Keyspace keyspace,
            T obj)

Parameters:

keyspace -

obj -

Returns:

saveObjCollection

public Collection<?> saveObjCollection(Keyspace keyspace,
                              Collection<?> objColl)

Persists the object collection using a single batch mutate. It is up to the client to partition large collections appropriately so not to cause timeout or buffer overflow issues. The objects can be heterogenous (mapping to multiple column families, etc.)

Parameters:

keyspace -

objColl -

Returns:

saveObjCollection

public Collection<?> saveObjCollection(Keyspace keyspace,
                              Collection<?> objColl,
                              Mutator<byte[]> m)

determineSerializer

public static Serializer<?> determineSerializer(Class<?> theType)

isSerializable

public static boolean isSerializable(Class<?> clazz)

isImplementedBy

public static boolean isImplementedBy(Class<?> clazz,
                      Class<?> target)

setKeyConcatStrategy

public void setKeyConcatStrategy(KeyConcatenationStrategy keyConcatStrategy)