com.graphhopper.util

Class Helper

java.lang.Object

com.graphhopper.util.Helper

public class Helper
extends Object

Several utility classes which are compatible with Java6 on Android.

Author:

Peter Karich

See Also:

for none-Android compatible methods.

Field Summary

Fields

Modifier and Type	Field and Description
static AngleCalc	ANGLE_CALC
static DistanceCalc3D	DIST_3D
static DistanceCalc	DIST_EARTH
static DistancePlaneProjection	DIST_PLANE
static long	MB
static TimeZone	UTC
static Charset	UTF_CS

Method Summary

Modifier and Type	Method and Description
static int	calcIndexSize(BBox graphBounds)
static String	camelCaseToUnderScore(String key)
static void	cleanHack() Trying to force the release of the mapped ByteBuffer.
static void	cleanMappedByteBuffer(ByteBuffer buffer)
static void	close(Closeable cl)
static int	countBitValue(int maxTurnCosts)
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 the UK locale.
static PointList	createPointList(double... list)
static PointList	createPointList3D(double... list)
static gnu.trove.list.TIntList	createTList(int... 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	eleToInt(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 double	intToEle(int integEle) Converts the integer value retrieved from storage into elevation (in meters).
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 void	loadProperties(Map<String,String> map, Reader tmpReader)
static String	nf(long no)
static String	pruneFileEnd(String file)
static List<String>	readFile(Reader simpleReader)
static List<String>	readFile(String file)
static boolean	removeDir(File file)
static double	round(double value, int exponent) Round the value to the specified exponent
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 ArrayList<Integer>	tIntListToArrayList(gnu.trove.list.TIntList from)
static int	toSignedInt(long x) Converts the specified long back into a signed int (reverse method for toUnsignedLong)
static long	toUnsignedLong(int x) This method handles the specified (potentially negative) int as unsigned bit representation and returns the positive converted long.
static String	underScoreToCamelCase(String key)

Methods inherited from class java.lang.Object

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

Field Detail

DIST_EARTH

public static final DistanceCalc DIST_EARTH

DIST_3D

public static final DistanceCalc3D DIST_3D

DIST_PLANE

public static final DistancePlaneProjection DIST_PLANE

ANGLE_CALC

public static final AngleCalc ANGLE_CALC

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 Detail

tIntListToArrayList

public static ArrayList<Integer> tIntListToArrayList(gnu.trove.list.TIntList from)

getLocale

public static Locale getLocale(String param)

countBitValue

public static int countBitValue(int maxTurnCosts)

loadProperties

public static void loadProperties(Map<String,String> map,
                                  Reader tmpReader)
                           throws IOException

Throws:

IOException

saveProperties

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

calcIndexSize

public static int calcIndexSize(BBox graphBounds)

pruneFileEnd

public static String pruneFileEnd(String file)

createTList

public static gnu.trove.list.TIntList createTList(int... list)

createPointList

public static PointList createPointList(double... list)

createPointList3D

public static PointList createPointList3D(double... list)

degreeToInt

public static final 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 accceptable. As +- 180° and +-90° are assumed as maximum values.

Returns:

the integer of the specified degree

intToDegree

public static final double intToDegree(int storedInt)

Converts back the integer value.

Returns:

the degree value of the specified integer

eleToInt

public static final int eleToInt(double ele)

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

intToEle

public static final double intToEle(int integEle)

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

cleanMappedByteBuffer

public static void cleanMappedByteBuffer(ByteBuffer buffer)

cleanHack

public static void cleanHack()

Trying to force the release of the mapped ByteBuffer. See http://stackoverflow.com/q/2972986/194609 and use only if you know what you are doing.

nf

public static String nf(long no)

firstBig

public static String firstBig(String sayText)

keepIn

public static final 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 exponent)

Round the value to the specified exponent

round6

public static final double round6(double value)

round4

public static final double round4(double value)

round2

public static final 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 the UK locale.

toUnsignedLong

public static final long toUnsignedLong(int x)

This method handles the specified (potentially negative) int as unsigned bit representation and returns the positive converted long.

toSignedInt

public static final int toSignedInt(long x)

Converts the specified long back into a signed int (reverse method for toUnsignedLong)

camelCaseToUnderScore

public static final String camelCaseToUnderScore(String key)

underScoreToCamelCase

public static final String underScoreToCamelCase(String key)