Package com.google.code.externalsorting

Class StringSizeEstimator

java.lang.Object

com.google.code.externalsorting.StringSizeEstimator

public final class StringSizeEstimator
extends Object

Simple class used to estimate memory usage.

Author:

Eleftherios Chetzakis

Method Summary

Modifier and Type	Method	Description
static long	estimatedSizeOf(String s)	Estimates the size of a String object in bytes.

Methods inherited from class java.lang.Object

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

Method Details

estimatedSizeOf

public static long estimatedSizeOf(String s)

Estimates the size of a String object in bytes. This function was designed with the following goals in mind (in order of importance) : First goal is speed: this function is called repeatedly and it should execute in not much more than a nanosecond. Second goal is to never underestimate (as it would lead to memory shortage and a crash). Third goal is to never overestimate too much (say within a factor of two), as it would mean that we are leaving much of the RAM underutilized.

Parameters:

s - The string to estimate memory footprint.

Returns:

The estimated size in bytes.