datafu.pig.hash.lsh.util

Enum DataTypeUtil

java.lang.Object

java.lang.Enum<DataTypeUtil>

datafu.pig.hash.lsh.util.DataTypeUtil

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<DataTypeUtil>

public enum DataTypeUtil
extends java.lang.Enum<DataTypeUtil>

A utility function to translate between pig types and vectors.

Enum Constant Summary

Enum Constants

Enum Constant and Description
INSTANCE

Method Summary

Modifier and Type	Method and Description
org.apache.commons.math.linear.RealVector	convert(org.apache.pig.data.Tuple t, int dim) Convert a tuple t into a RealVector of dimension dim.
static boolean	isValidVector(org.apache.pig.impl.logicalLayer.schema.Schema.FieldSchema inputSchema, int dimension)
static DataTypeUtil	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static DataTypeUtil[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INSTANCE

public static final DataTypeUtil INSTANCE

Method Detail

values

public static DataTypeUtil[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (DataTypeUtil c : DataTypeUtil.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static DataTypeUtil valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

convert

public org.apache.commons.math.linear.RealVector convert(org.apache.pig.data.Tuple t,
                                                         int dim)
                                                  throws org.apache.pig.PigException

Convert a tuple t into a RealVector of dimension dim. The tuple can be of a couple of forms:

• A tuple composed of dim numeric types a la (1.0,2.0,3,5.0)
• A tuple which contains as its first element a tuple like above a la ( (1.0,2.0,3,5.0), 5) ) would yield (1.0,2.0,3,5.0)
• A bag containing tuples where the first element is the position and the second element is the value. This is for sparse vectors and it looks like this ( { (0,1.0), (1, 2.0), (3,3), (4,5.0) } ).

Parameters:

t - The tuple to convert to a vector

dim - The dimension of the vector

Returns:

The actual RealVector (which may or may not be sparse)

Throws:

org.apache.pig.PigException - PigException

isValidVector

public static boolean isValidVector(org.apache.pig.impl.logicalLayer.schema.Schema.FieldSchema inputSchema,
                                    int dimension)