org.springframework.data.hadoop.store.expression

Class HashMethodExecutor

java.lang.Object

org.springframework.data.hadoop.store.expression.HashMethodExecutor

All Implemented Interfaces:

org.springframework.expression.MethodExecutor

public class HashMethodExecutor
extends java.lang.Object
implements org.springframework.expression.MethodExecutor

A MethodExecutor using an first argument as an Object to get its hashcode and second argument expected to be an Integer to calculate a simple bucket name.

Spel expression "hash(region,2)" would create either key "0_hash" or "1_hash". Using a bucketsize 0 results an AccessException.

Author:

Janne Valkealahti

Constructor Summary

Constructors

Constructor and Description
HashMethodExecutor()

Method Summary

Methods

Modifier and Type	Method and Description
org.springframework.expression.TypedValue	execute(org.springframework.expression.EvaluationContext context, java.lang.Object target, java.lang.Object... arguments)
static java.lang.String	hash(int arg1, int arg2)
static java.lang.String	hash(java.lang.Object arg1, java.lang.Integer arg2)

Methods inherited from class java.lang.Object

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

Constructor Detail

HashMethodExecutor

public HashMethodExecutor()

Method Detail

execute

public org.springframework.expression.TypedValue execute(org.springframework.expression.EvaluationContext context,
                                                java.lang.Object target,
                                                java.lang.Object... arguments)
                                                  throws org.springframework.expression.AccessException

Specified by:

execute in interface org.springframework.expression.MethodExecutor

Throws:

org.springframework.expression.AccessException

hash

public static java.lang.String hash(int arg1,
                    int arg2)

hash

public static java.lang.String hash(java.lang.Object arg1,
                    java.lang.Integer arg2)