Class PopulationQuery

java.lang.Object

PopulationQuery

public class PopulationQuery
extends java.lang.Object

This class queries census data to find population densities in different areas of the US.

Field Summary

Fields

Modifier and Type	Field and Description
private CensusData	data Array of census data parsed from the input file.
private static java.util.concurrent.ForkJoinPool	fjPool There should be only one fork/join pool per program, so this needs to be a static variable.
static int	LATITUDE_INDEX For parsing - zero-based index of the field containing the latitude of the current census group.
static int	LONGITUDE_INDEX For parsing - zero-based index of the field containing the longitude of the current census group.
static int	POPULATION_INDEX For parsing - zero-based index of the field containing the population of the current census group.
static int	TOKENS_PER_LINE For parsing - the number of comma-separated fields on a given line.

Constructor Summary

Constructors

Constructor and Description
PopulationQuery(java.lang.String filename) Initialize the query object by parsing the census data in the given file.

Method Summary

Methods

Modifier and Type	Method and Description
static void	main(java.lang.String[] args)
private static CensusData	parse(java.lang.String filename) Parse the input file into a large array held in a CensusData object.
void	preprocess(int cols, int rows, int versionNum) Preprocess the census data for a run using the given parameters.
Pair<java.lang.Integer,java.lang.Float>	singleInteraction(int w, int s, int e, int n) Query the population of a given rectangle.

Methods inherited from class java.lang.Object

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

Field Detail

TOKENS_PER_LINE

public static final int TOKENS_PER_LINE

For parsing - the number of comma-separated fields on a given line.

See Also:

Constant Field Values

POPULATION_INDEX

public static final int POPULATION_INDEX

For parsing - zero-based index of the field containing the population of the current census group.

See Also:

Constant Field Values

LATITUDE_INDEX

public static final int LATITUDE_INDEX

For parsing - zero-based index of the field containing the latitude of the current census group.

See Also:

Constant Field Values

LONGITUDE_INDEX

public static final int LONGITUDE_INDEX

For parsing - zero-based index of the field containing the longitude of the current census group.

See Also:

Constant Field Values

fjPool

private static java.util.concurrent.ForkJoinPool fjPool

There should be only one fork/join pool per program, so this needs to be a static variable.

data

private CensusData data

Array of census data parsed from the input file.

Constructor Detail

PopulationQuery

public PopulationQuery(java.lang.String filename)

Initialize the query object by parsing the census data in the given file.

Parameters:

filename - name of the census data file

Method Detail

parse

private static CensusData parse(java.lang.String filename)

Parse the input file into a large array held in a CensusData object.

Parameters:

filename - name of the file to be used as input.

Returns:

CensusData object containing the parsed data.

preprocess

public void preprocess(int cols,
              int rows,
              int versionNum)

Preprocess the census data for a run using the given parameters.

Parameters:

cols - Number of columns in the map grid.

rows - Number of rows in the map grid.

versionNum - implementation to use

singleInteraction

public Pair<java.lang.Integer,java.lang.Float> singleInteraction(int w,
                                                        int s,
                                                        int e,
                                                        int n)

Query the population of a given rectangle.

Parameters:

w - western edge of the rectangle

s - southern edge of the rectangle

e - eastern edge of the rectangle

n - northern edge of the rectangle

Returns:

pair containing the population of the rectangle and the population as a percentage of the total US population.

main

public static void main(java.lang.String[] args)