org.geotools.measure

Class AngleFormat

Object

Format

AngleFormat

All Implemented Interfaces:

Serializable, Cloneable

public class AngleFormat
extends Format

Parses and formats angles according a specified pattern. The pattern is a string containing any characters, with a special meaning for the following characters:

D	The integer part of degrees
d	The fractional part of degrees
M	The integer part of minutes
m	The fractional part of minutes
S	The integer part of seconds
s	The fractional part of seconds
.	The decimal separator

Upper-case letters D, M and S are for the integer parts of degrees, minutes and seconds respectively. They must appear in this order (e.g. "M'D" is illegal because "M" and "S" are inverted; "D°S" is illegal too because there is no "M" between "D" and "S"). Lower-case letters d, m and s are for fractional parts of degrees, minutes and seconds respectively. Only one of those may appears in a pattern, and it must be the last special symbol (e.g. "D.dd°MM'" is illegal because "d" is followed by "M"; "D.mm" is illegal because "m" is not the fractional part of "D").

The number of occurrence of D, M, S and their lower-case counterpart is the number of digits to format. For example, "DD.ddd" will format angle with two digits for the integer part and three digits for the fractional part (e.g. 4.4578 will be formatted as "04.458"). Separator characters like °, ' and " and inserted "as-is" in the formatted string (except the decimal separator dot ("."), which is replaced by the local-dependent decimal separator). Separator characters may be completely omitted; AngleFormat will still differentiate degrees, minutes and seconds fields according the pattern. For example, "0480439" with the pattern "DDDMMmm" will be parsed as 48°04.39'.

The following table gives some examples of legal patterns.

Pattern	Example
DD°MM'SS"	48°30'00"
DD°MM'	48°30'
DD.ddd	48.500
DDMM	4830
DDMMSS	483000

Since:

2.0

Author:

Martin Desruisseaux (PMO, IRD)

See Also:

Angle, Latitude, Longitude, Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	AngleFormat.RoundingMethod Set the rounding method to use when the last significant digit in a value is 5.

Nested classes/interfaces inherited from class Format

Format.Field

Field Summary

Fields

Modifier and Type	Field and Description
static AngleFormat.RoundingMethod	DEFAULT_ROUNDING_METHOD The default rounding method (AngleFormat.RoundingMethod.ROUND_HALF_EVEN).
static int	DEGREES_FIELD Constant for degrees field.
static int	HEMISPHERE_FIELD Constant for hemisphere field.
static int	MINUTES_FIELD Constant for minutes field.
static int	SECONDS_FIELD Constant for seconds field.

Constructor Summary

Constructors

Constructor and Description
AngleFormat() Constructs a new AngleFormat using the current default locale and a default pattern.
AngleFormat(String pattern) Constructs a new AngleFormat using the current default locale and the specified pattern.
AngleFormat(String pattern, DecimalFormatSymbols symbols) Constructs a new AngleFormat using the specified pattern and decimal symbols.
AngleFormat(String pattern, Locale locale) Constructs a new AngleFormat using the specified pattern and locale.

Method Summary

Modifier and Type	Method and Description
void	applyPattern(String pattern) Sets the pattern to use for parsing and formatting angle.
boolean	equals(Object obj) Compares this format with the specified object for equality.
String	format(double angle) Format an angle.
StringBuffer	format(double angle, StringBuffer toAppendTo, FieldPosition pos) Formats an angle and appends the resulting text to a given string buffer.
StringBuffer	format(Object obj, StringBuffer toAppendTo, FieldPosition pos) Formats an angle, a latitude or a longitude and appends the resulting text to a given string buffer.
static AngleFormat.RoundingMethod	getDefaultRoundingMethod() Get the default rounding method.
static AngleFormat	getInstance(Locale locale) Constructs a new AngleFormat for the specified locale.
static AngleFormat.RoundingMethod	getRoundingMethod() Get the rounding method being used by this instance.
int	hashCode() Returns a "hash value" for this object.
Angle	parse(String source) Parses a string as an angle.
Angle	parse(String source, ParsePosition pos) Parses a string as an angle.
Angle	parseObject(String source) Parses a string as an object.
Angle	parseObject(String source, ParsePosition pos) Parses a substring as an angle.
static void	setDefaultRoundingMethod(AngleFormat.RoundingMethod method) Set the default rounding method for all instances of this class to use when the last significant digit of a value is 5.
void	setRoundingMethod(AngleFormat.RoundingMethod method) Set the rounding method for this instance to use when the last significant digit of a value is 5.
String	toPattern() Returns the pattern used for parsing and formatting angles.
String	toString() Returns a string representation of this object.

Methods inherited from class Format

clone, format, formatToCharacterIterator

Methods inherited from class Object

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

Field Detail

DEGREES_FIELD

public static final int DEGREES_FIELD

Constant for degrees field. When formatting a string, this value may be specified to the FieldPosition constructor in order to get the bounding index where degrees have been written.

See Also:

Constant Field Values

MINUTES_FIELD

public static final int MINUTES_FIELD

Constant for minutes field. When formatting a string, this value may be specified to the FieldPosition constructor in order to get the bounding index where minutes have been written.

See Also:

Constant Field Values

SECONDS_FIELD

public static final int SECONDS_FIELD

Constant for seconds field. When formatting a string, this value may be specified to the FieldPosition constructor in order to get the bounding index where seconds have been written.

See Also:

Constant Field Values

HEMISPHERE_FIELD

public static final int HEMISPHERE_FIELD

Constant for hemisphere field. When formatting a string, this value may be specified to the FieldPosition constructor in order to get the bounding index where the hemisphere synbol has been written.

See Also:

Constant Field Values

DEFAULT_ROUNDING_METHOD

public static final AngleFormat.RoundingMethod DEFAULT_ROUNDING_METHOD

The default rounding method (AngleFormat.RoundingMethod.ROUND_HALF_EVEN).

Constructor Detail

AngleFormat

public AngleFormat()

Constructs a new AngleFormat using the current default locale and a default pattern.

AngleFormat

public AngleFormat(String pattern)
            throws IllegalArgumentException

Constructs a new AngleFormat using the current default locale and the specified pattern.

Parameters:

pattern - Pattern to use for parsing and formatting angle. See class description for an explanation of how this pattern work.

Throws:

IllegalArgumentException - If the specified pattern is not legal.

AngleFormat

public AngleFormat(String pattern,
                   Locale locale)
            throws IllegalArgumentException

Constructs a new AngleFormat using the specified pattern and locale.

Parameters:

pattern - Pattern to use for parsing and formatting angle. See class description for an explanation of how this pattern work.

locale - Locale to use.

Throws:

IllegalArgumentException - If the specified pattern is not legal.

AngleFormat

public AngleFormat(String pattern,
                   DecimalFormatSymbols symbols)

Constructs a new AngleFormat using the specified pattern and decimal symbols.

Parameters:

pattern - Pattern to use for parsing and formatting angle. See class description for an explanation of how this pattern work.

symbols - The symbols to use for parsing and formatting numbers.

Throws:

IllegalArgumentException - If the specified pattern is not legal.

Method Detail

getInstance

public static AngleFormat getInstance(Locale locale)

Constructs a new AngleFormat for the specified locale.

Parameters:

locale - The locale.

Returns:

An angle format in the given locale.

setDefaultRoundingMethod

public static void setDefaultRoundingMethod(AngleFormat.RoundingMethod method)

Set the default rounding method for all instances of this class to use when the last significant digit of a value is 5.

Note: this will not affect the rounding method being used by instances of this class created previously.

Parameters:

method - one of AngleFormat.RoundingMethod constants

See Also:

setRoundingMethod(org.geotools.measure.AngleFormat.RoundingMethod), DEFAULT_ROUNDING_METHOD

getDefaultRoundingMethod

public static AngleFormat.RoundingMethod getDefaultRoundingMethod()

Get the default rounding method.

Returns:

the default rounding method.

setRoundingMethod

public void setRoundingMethod(AngleFormat.RoundingMethod method)

Set the rounding method for this instance to use when the last significant digit of a value is 5. If the rounding method has previously been set globally with the static setDefaultRoundingMethod(org.geotools.measure.AngleFormat.RoundingMethod) method, setting a different method here will take precedence for this instance.

Parameters:

method - one of AngleFormat.RoundingMethod constants

See Also:

setDefaultRoundingMethod(org.geotools.measure.AngleFormat.RoundingMethod), DEFAULT_ROUNDING_METHOD

getRoundingMethod

public static AngleFormat.RoundingMethod getRoundingMethod()

Get the rounding method being used by this instance.

Returns:

the rounding method for this instance

applyPattern

public void applyPattern(String pattern)
                  throws IllegalArgumentException

Sets the pattern to use for parsing and formatting angle. See class description for an explanation of how patterns work.

Parameters:

pattern - Pattern to use for parsing and formatting angle.

Throws:

IllegalArgumentException - If the specified pattern is not legal.

toPattern

public String toPattern()

Returns the pattern used for parsing and formatting angles. See class description for an explanation of how patterns work.

Returns:

The formatting pattern.

format

public final String format(double angle)

Format an angle. The string will be formatted according the pattern set in the last call to applyPattern(java.lang.String).

Parameters:

angle - Angle to format, in degrees.

Returns:

The formatted string.

format

public StringBuffer format(double angle,
                           StringBuffer toAppendTo,
                           FieldPosition pos)

Formats an angle and appends the resulting text to a given string buffer. The string will be formatted according the pattern set in the last call to applyPattern(java.lang.String).

Parameters:

angle - Angle to format, in degrees.

toAppendTo - Where the text is to be appended.

pos - An optional FieldPosition identifying a field in the formatted text, or null if this information is not wanted. This field position shall be constructed with one of the following constants: DEGREES_FIELD, MINUTES_FIELD, SECONDS_FIELD or HEMISPHERE_FIELD.

Returns:

The string buffer passed in as toAppendTo, with formatted text appended.

format

public StringBuffer format(Object obj,
                           StringBuffer toAppendTo,
                           FieldPosition pos)
                    throws IllegalArgumentException

Formats an angle, a latitude or a longitude and appends the resulting text to a given string buffer. The string will be formatted according the pattern set in the last call to applyPattern(java.lang.String). The argument obj shall be an Angle object or one of its derived class (Latitude, Longitude). If obj is a Latitude object, then a symbol "N" or "S" will be appended to the end of the string (the symbol will be choosen according the angle's sign). Otherwise, if obj is a Longitude object, then a symbol "E" or "W" will be appended to the end of the string. Otherwise, no hemisphere symbol will be appended.

Strictly speaking, formatting ordinary numbers is not the AngleFormat's job. Nevertheless, this method accept Number objects. This capability is provided only as a convenient way to format altitude numbers together with longitude and latitude angles.

Specified by:

format in class Format

Parameters:

obj - Angle or Number object to format.

toAppendTo - Where the text is to be appended.

pos - An optional FieldPosition identifying a field in the formatted text, or null if this information is not wanted. This field position shall be constructed with one of the following constants: DEGREES_FIELD, MINUTES_FIELD, SECONDS_FIELD or HEMISPHERE_FIELD.

Returns:

The string buffer passed in as toAppendTo, with formatted text appended.

Throws:

IllegalArgumentException - if obj if not an object of class Angle or Number.

parse

public Angle parse(String source,
                   ParsePosition pos)

Parses a string as an angle. This method can parse an angle even if it doesn't comply exactly to the expected pattern. For example, this method will parse correctly string "48°12.34'" even if the expected pattern was "DDMM.mm" (i.e. the string should have been "4812.34"). Spaces between degrees, minutes and secondes are ignored. If the string ends with an hemisphere symbol "N" or "S", then this method returns an object of class Latitude. Otherwise, if the string ends with an hemisphere symbol "E" or "W", then this method returns an object of class Longitude. Otherwise, this method returns an object of class Angle.

Parameters:

source - A String whose beginning should be parsed.

pos - Position where to start parsing.

Returns:

The parsed string as an Angle, Latitude or Longitude object.

parse

public Angle parse(String source)
            throws ParseException

Parses a string as an angle.

Parameters:

source - The string to parse.

Returns:

The parsed string as an Angle, Latitude or Longitude object.

Throws:

ParseException - if the string has not been fully parsed.

parseObject

public Angle parseObject(String source,
                         ParsePosition pos)

Parses a substring as an angle. Default implementation invokes parse(String, ParsePosition).

Specified by:

parseObject in class Format

Parameters:

source - A String whose beginning should be parsed.

pos - Position where to start parsing.

Returns:

The parsed string as an Angle, Latitude or Longitude object.

parseObject

public Angle parseObject(String source)
                  throws ParseException

Parses a string as an object. Default implementation invokes parse(String).

Overrides:

parseObject in class Format

Parameters:

source - The string to parse.

Returns:

The parsed string as an Angle, Latitude or Longitude object.

Throws:

ParseException - if the string has not been fully parsed.

hashCode

public int hashCode()

Returns a "hash value" for this object.

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Compares this format with the specified object for equality.

Overrides:

equals in class Object

toString

public String toString()

Returns a string representation of this object.

Overrides:

toString in class Object