com.google.appengine.tools.mapreduce

Class Marshallers

java.lang.Object

com.google.appengine.tools.mapreduce.Marshallers

public class Marshallers
extends Object

Some Marshallers and related utilities.

Author:

ohler@google.com (Christian Ohler)

Method Summary

Methods

Modifier and Type	Method and Description
static Marshaller<ByteBuffer>	getByteBufferMarshaller() Returns a Marshaller for ByteBuffer.
static <T> Marshaller<T>	getGenericJsonMarshaller(Class<T> type) Returns a Marshaller for the given type.
static Marshaller<Integer>	getIntegerMarshaller() Returns a Marshaller for Integerss that uses a more efficient representation than getSerializationMarshaller().
static <K,V> Marshaller<KeyValue<K,V>>	getKeyValueMarshaller(Marshaller<K> keyMarshaller, Marshaller<V> valueMarshaller) Returns a Marshaller for key-value pairs based on keyMarshaller and valueMarshaller.
static <K,V> Marshaller<KeyValue<K,? extends Iterable<V>>>	getKeyValuesMarshaller(Marshaller<K> keyMarshaller, Marshaller<V> valueMarshaller) Returns a Marshaller for key-values pairs based on keyMarshaller and valueMarshaller.
static Marshaller<Long>	getLongMarshaller() Returns a Marshaller for Longs that uses a more efficient representation than getSerializationMarshaller().
static <T extends Serializable> Marshaller<T>	getSerializationMarshaller() Returns a Marshaller that uses Java Serialization.
static Marshaller<String>	getStringMarshaller() Returns a Marshaller for Strings.
static Marshaller<Void>	getVoidMarshaller() Returns a Marshaller for Void.

Methods inherited from class java.lang.Object

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

Method Detail

getSerializationMarshaller

public static <T extends Serializable> Marshaller<T> getSerializationMarshaller()

Returns a Marshaller that uses Java Serialization. Works for any type that implements Serializable, but is not space-efficient for boxed primitives like Long or Double.

getStringMarshaller

public static Marshaller<String> getStringMarshaller()

Returns a Marshaller for Strings. They will be encoded in UTF-8.

getLongMarshaller

public static Marshaller<Long> getLongMarshaller()

Returns a Marshaller for Longs that uses a more efficient representation than getSerializationMarshaller().

getIntegerMarshaller

public static Marshaller<Integer> getIntegerMarshaller()

Returns a Marshaller for Integerss that uses a more efficient representation than getSerializationMarshaller().

getVoidMarshaller

public static Marshaller<Void> getVoidMarshaller()

Returns a Marshaller for Void.

getByteBufferMarshaller

public static Marshaller<ByteBuffer> getByteBufferMarshaller()

Returns a Marshaller for ByteBuffer.

getKeyValueMarshaller

public static <K,V> Marshaller<KeyValue<K,V>> getKeyValueMarshaller(Marshaller<K> keyMarshaller,
                                                    Marshaller<V> valueMarshaller)

Returns a Marshaller for key-value pairs based on keyMarshaller and valueMarshaller.

getKeyValuesMarshaller

public static <K,V> Marshaller<KeyValue<K,? extends Iterable<V>>> getKeyValuesMarshaller(Marshaller<K> keyMarshaller,
                                                                         Marshaller<V> valueMarshaller)

Returns a Marshaller for key-values pairs based on keyMarshaller and valueMarshaller.

getGenericJsonMarshaller

public static <T> Marshaller<T> getGenericJsonMarshaller(Class<T> type)

Returns a Marshaller for the given type. Uses jackson to serialize/deserialize.