com.graphhopper.routing.ch

Class PrepareEncoder

java.lang.Object

com.graphhopper.routing.ch.PrepareEncoder

public class PrepareEncoder
extends Object

The flags are stored differently for shortcuts: just one weight and the two direction bits which is handled by this class for now as static methods.

Author:

Peter Karich

Constructor Summary

Constructors

Constructor and Description
PrepareEncoder()

Method Summary

Modifier and Type	Method and Description
static int	getScBwdDir() The bit for backward direction
static int	getScDirMask() A bitmask for two directions
static int	getScFwdDir() The bit for forward direction
static int	getScMergeStatus(int existingScFlags, int newScFlags) Returns 1 if existingScFlags of an existing shortcut can be overwritten with a new shortcut by newScFlags without limiting or changing the directions of the existing shortcut.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrepareEncoder

public PrepareEncoder()

Method Detail

getScDirMask

public static final int getScDirMask()

A bitmask for two directions

getScFwdDir

public static final int getScFwdDir()

The bit for forward direction

getScBwdDir

public static final int getScBwdDir()

The bit for backward direction

getScMergeStatus

public static final int getScMergeStatus(int existingScFlags,
                                         int newScFlags)

Returns 1 if existingScFlags of an existing shortcut can be overwritten with a new shortcut by newScFlags without limiting or changing the directions of the existing shortcut. The method returns 2 for the same condition but only if the new shortcut has to be added even if weight is higher than existing shortcut weight.

                 | newScFlags:
 existingScFlags | -> | <- | <->
 ->              |  1 | 0  | 2
 <-              |  0 | 1  | 2
 <->             |  0 | 0  | 1
 

Returns:

1 if newScFlags is identical to existingScFlags for the two direction bits and 0 otherwise. There are two special cases when it returns 2.