org.vfny.geoserver.zserver
Class NumericField

java.lang.Object
  org.vfny.geoserver.zserver.NumericField

public class NumericField

extends java.lang.Object

Implements a way to turn numbers into comparable strings and vice versa, so that they can be indexed and compared by lucene.

Field Summary

protected static int	defaultLeft The number of significant digits to the left of the decimal.
protected static int	defaultRight The number of digits to the right of the decimal.
protected static char	NORM The char to normalize against.

Constructor Summary

NumericField()

Method Summary

protected static char	fixupChar(char digit, int signMultiplier) Normalizes the digit into a character.
static java.lang.String	numberToString(java.lang.Double num) Calls numberToString with default values for the left and right significant digits.
static java.lang.String	numberToString(java.lang.String numString) Convenience method for the numberToString that takes a double.
static java.lang.Double	stringToNumber(java.lang.String s) Calls stringToNumber with default values for the left and right significant digits.

Methods inherited from class java.lang.Object

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

Field Detail

NORM

protected static final char NORM

The char to normalize against.

See Also:

Constant Field Values

defaultLeft

protected static final int defaultLeft

The number of significant digits to the left of the decimal.

See Also:

Constant Field Values

defaultRight

protected static final int defaultRight

The number of digits to the right of the decimal.

See Also:

Constant Field Values

Constructor Detail

NumericField

public NumericField()

Method Detail

fixupChar

protected static char fixupChar(char digit,
                                int signMultiplier)

Normalizes the digit into a character. The signMultiplier tells which way to normalize, up for positive, down for negative.

Parameters:

digit - The character of the digit to be fixed up.

signMultiplier - should be 1 for positives, -1 for negatives.

Returns:

the char that is 'digit' chars away from the NORM, in the direction of the signMultiplier.

numberToString

public static java.lang.String numberToString(java.lang.String numString)
                                       throws java.lang.NumberFormatException

Convenience method for the numberToString that takes a double. Simply does the parsing on the string, passes it to numberToString.

Parameters:

numString - the string representation of a number.

Returns:

the lucene comparable string.

Throws:

java.lang.NumberFormatException - if the passed in string can't be parsed.

numberToString

public static java.lang.String numberToString(java.lang.Double num)

Calls numberToString with default values for the left and right significant digits.

Parameters:

num - the number to convert.

Returns:

the lucene comparable string.

stringToNumber

public static java.lang.Double stringToNumber(java.lang.String s)

Calls stringToNumber with default values for the left and right significant digits.

Parameters:

s - the lucene searchable string to be converted to a double.

Returns:

the Double represented by s.