Package com.graphhopper.util

Class Helper

java.lang.Object

com.graphhopper.util.Helper

public class Helper
extends Object

Author:

Peter Karich

Field Summary

Fields

Modifier and Type	Field	Description
static final long	MB
static final TimeZone	UTC
static final Charset	UTF_CS

Method Summary

Modifier and Type	Method	Description
static String	camelCaseToUnderScore(String key)
static void	close(Closeable cl)
static List<Double>	createDoubleList(double[] values)
static DateFormat	createFormatter()	This creates a date formatter for yyyy-MM-dd'T'HH:mm:ss'Z' which is has to be identical to buildDate used in pom.xml
static DateFormat	createFormatter(String str)	Creates a SimpleDateFormat with ENGLISH locale.
static PointList	createPointList(double... list)
static PointList	createPointList3D(double... list)
static int	degreeToInt(double deg)	Converts into an integer to be compatible with the still limited DataAccess class (accepts only integer values).
static int	eleToUInt(double ele)	Converts elevation value (in meters) into integer for storage.
static String	firstBig(String sayText)
static Locale	getLocale(String param)
static String	getMemInfo()
static int	getSizeOfLongArray(int length, int factor)
static int	getSizeOfObjectArray(int length, int factor)
static int	getSizeOfObjectRef(int factor)
static long	getTotalMB()
static long	getUsedMB()
static int	idealByteArraySize(int need)
static int	idealIntArraySize(int need)
static double	intToDegree(int storedInt)	Converts back the integer value.
static boolean	isEmpty(String str)
static boolean	isFileMapped(ByteBuffer bb)	Determines if the specified ByteBuffer is one which maps to a file!
static String	isToString(InputStream inputStream)
static double	keepIn(double value, double min, double max)	This methods returns the value or min if too small or max if too big.
static String	nf(long no)
static List<String>	parseList(String listStr)	parses a string like [a,b,c]
static String	pruneFileEnd(String file)
static List<String>	readFile(Reader simpleReader)
static List<String>	readFile(String file)
static String	readJSONFileWithoutComments(InputStreamReader reader)
static String	readJSONFileWithoutComments(String file)
static boolean	removeDir(File file)
static double	round(double value, int decimalPlaces)	Round the value to the specified number of decimal places, i.e.
static double	round2(double value)
static double	round4(double value)
static double	round6(double value)
static void	saveProperties(Map<String,String> map, Writer tmpWriter)
static int	staticHashCode(String str)	Produces a static hashcode for a string that is platform independent and still compatible to the default of openjdk.
static String	toLowerCase(String string)
static Object	toObject(String string)	This method probes the specified string for a boolean, int, long, float and double.
static String	toUpperCase(String string)
static double	uIntToEle(int integEle)	Converts the integer value retrieved from storage into elevation (in meters).
static String	underScoreToCamelCase(String key)

Methods inherited from class java.lang.Object

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

Field Details

UTF_CS

public static final Charset UTF_CS

UTC

public static final TimeZone UTC

MB

public static final long MB

See Also:

• Constant Field Values

Method Details

getLocale

public static Locale getLocale(String param)

toLowerCase

public static String toLowerCase(String string)

toUpperCase

public static String toUpperCase(String string)

saveProperties

public static void saveProperties(Map<String,String> map,
 Writer tmpWriter)
                           throws IOException

Throws:

IOException

readJSONFileWithoutComments

public static String readJSONFileWithoutComments(String file)
                                          throws IOException

Throws:

IOException

readJSONFileWithoutComments

public static String readJSONFileWithoutComments(InputStreamReader reader)
                                          throws IOException

Throws:

IOException

readFile

public static List<String> readFile(String file)
                             throws IOException

Throws:

IOException

readFile

public static List<String> readFile(Reader simpleReader)
                             throws IOException

Throws:

IOException

isToString

public static String isToString(InputStream inputStream)
                         throws IOException

Throws:

IOException

idealIntArraySize

public static int idealIntArraySize(int need)

idealByteArraySize

public static int idealByteArraySize(int need)

removeDir

public static boolean removeDir(File file)

getTotalMB

public static long getTotalMB()

getUsedMB

public static long getUsedMB()

getMemInfo

public static String getMemInfo()

getSizeOfObjectRef

public static int getSizeOfObjectRef(int factor)

getSizeOfLongArray

public static int getSizeOfLongArray(int length,
 int factor)

getSizeOfObjectArray

public static int getSizeOfObjectArray(int length,
 int factor)

close

public static void close(Closeable cl)

isEmpty

public static boolean isEmpty(String str)

isFileMapped

public static boolean isFileMapped(ByteBuffer bb)

Determines if the specified ByteBuffer is one which maps to a file!

pruneFileEnd

public static String pruneFileEnd(String file)

createDoubleList

public static List<Double> createDoubleList(double[] values)

createPointList

public static PointList createPointList(double... list)

createPointList3D

public static PointList createPointList3D(double... list)

degreeToInt

public static int degreeToInt(double deg)

Converts into an integer to be compatible with the still limited DataAccess class (accepts only integer values). But this conversion also reduces memory consumption where the precision loss is acceptable. As +- 180° and +-90° are assumed as maximum values.

Returns:

the integer of the specified degree

intToDegree

public static double intToDegree(int storedInt)

Converts back the integer value.

Returns:

the degree value of the specified integer

eleToUInt

public static int eleToUInt(double ele)

Converts elevation value (in meters) into integer for storage.

uIntToEle

public static double uIntToEle(int integEle)

Converts the integer value retrieved from storage into elevation (in meters). Do not expect more precision than meters although it currently is!

nf

public static String nf(long no)

firstBig

public static String firstBig(String sayText)

keepIn

public static double keepIn(double value,
 double min,
 double max)

This methods returns the value or min if too small or max if too big.

round

public static double round(double value,
 int decimalPlaces)

Round the value to the specified number of decimal places, i.e. decimalPlaces=2 means we round to two decimal places. Using negative values like decimalPlaces=-2 means we round to two places before the decimal point.

round6

public static double round6(double value)

round4

public static double round4(double value)

round2

public static double round2(double value)

createFormatter

public static DateFormat createFormatter()

This creates a date formatter for yyyy-MM-dd'T'HH:mm:ss'Z' which is has to be identical to buildDate used in pom.xml

createFormatter

public static DateFormat createFormatter(String str)

Creates a SimpleDateFormat with ENGLISH locale.

toObject

public static Object toObject(String string)

This method probes the specified string for a boolean, int, long, float and double. If all this fails it returns the unchanged string.

camelCaseToUnderScore

public static String camelCaseToUnderScore(String key)

underScoreToCamelCase

public static String underScoreToCamelCase(String key)

parseList

public static List<String> parseList(String listStr)

parses a string like [a,b,c]

staticHashCode

public static int staticHashCode(String str)

Produces a static hashcode for a string that is platform independent and still compatible to the default of openjdk. Do not use for performance critical applications.

See Also:

• String.hashCode()