edu.umn.cs.spatialHadoop.core

Class GridInfo

java.lang.Object

edu.umn.cs.spatialHadoop.core.Rectangle

edu.umn.cs.spatialHadoop.core.GridInfo

All Implemented Interfaces:

Shape, TextSerializable, java.lang.Cloneable

public class GridInfo
extends Rectangle

Stores grid information that can be used with spatial files. The grid is uniform which means all cells have the same width and the same height.

Author:

Ahmed Eldawy

Field Summary

Fields

Modifier and Type	Field and Description
int	columns
int	rows

Fields inherited from class edu.umn.cs.spatialHadoop.core.Rectangle

x1, x2, y1, y2

Constructor Summary

Constructors

Constructor and Description
GridInfo()
GridInfo(double x1, double y1, double x2, double y2)

Method Summary

Methods

Modifier and Type	Method and Description
void	calculateCellDimensions(int numCells)
void	calculateCellDimensions(long totalFileSize, long blockSize)
boolean	equals(java.lang.Object obj)
void	fromText(Text text) Retrieve information from the given text.
CellInfo[]	getAllCells()
double	getAverageCellHeight()
double	getAverageCellWidth()
CellInfo	getCell(int cellId) Returns the information of a grid cell given it ID
int	getCellId(int column, int row)
int	getOverlappingCell(double x, double y)
java.awt.Rectangle	getOverlappingCells(Rectangle rect) Computes the range of all cells that overlap a given rectangle
void	readFields(java.io.DataInput in)
java.lang.String	toString()
Text	toText(Text text) Store current object as string in the given text appending text already there.
void	write(java.io.DataOutput out)

Methods inherited from class edu.umn.cs.spatialHadoop.core.Rectangle

buffer, clone, compareTo, compareTo, contains, contains, contains, contains, distanceTo, draw, draw, expand, getCenterPoint, getHeight, getIntersection, getMaxDistance, getMaxDistanceTo, getMBR, getMinDistance, getMinDistanceTo, getWidth, invalidate, isIntersected, isValid, set, set, toWKT, translate, union

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

columns

public int columns

rows

public int rows

Constructor Detail

GridInfo

public GridInfo()

GridInfo

public GridInfo(double x1,
        double y1,
        double x2,
        double y2)

Method Detail

write

public void write(java.io.DataOutput out)
           throws java.io.IOException

Overrides:

write in class Rectangle

Throws:

java.io.IOException

readFields

public void readFields(java.io.DataInput in)
                throws java.io.IOException

Overrides:

readFields in class Rectangle

Throws:

java.io.IOException

toString

public java.lang.String toString()

Overrides:

toString in class Rectangle

getAverageCellHeight

public double getAverageCellHeight()

getAverageCellWidth

public double getAverageCellWidth()

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class Rectangle

calculateCellDimensions

public void calculateCellDimensions(long totalFileSize,
                           long blockSize)

calculateCellDimensions

public void calculateCellDimensions(int numCells)

toText

public Text toText(Text text)

Description copied from interface: TextSerializable

Store current object as string in the given text appending text already there.

Specified by:

toText in interface TextSerializable

Overrides:

toText in class Rectangle

fromText

public void fromText(Text text)

Description copied from interface: TextSerializable

Retrieve information from the given text.

Specified by:

fromText in interface TextSerializable

Overrides:

fromText in class Rectangle

getAllCells

public CellInfo[] getAllCells()

getOverlappingCells

public java.awt.Rectangle getOverlappingCells(Rectangle rect)

Computes the range of all cells that overlap a given rectangle

Parameters:

rect -

Returns:

getOverlappingCell

public int getOverlappingCell(double x,
                     double y)

getCell

public CellInfo getCell(int cellId)

Returns the information of a grid cell given it ID

Parameters:

cellId -

Returns:

getCellId

public int getCellId(int column,
            int row)