com.graphhopper.coll

Class CompressedArray

java.lang.Object

com.graphhopper.coll.CompressedArray

public class CompressedArray
extends Object

Stores the entries in compressed segments. The methods de(compress) are taken from Lucene CompressionTools. Before accessing the stored values be sure you called flush.

Author:

Peter Karich

Constructor Summary

Constructors

Constructor and Description
CompressedArray()
CompressedArray(int _segments, int entriesPerSeg, int approxBytesPerEntry)

Method Summary

Modifier and Type	Method and Description
float	calcMemInMB()
static byte[]	compress(byte[] value, int offset, int length, int compressionLevel) Compresses the specified byte range using the specified compressionLevel (constants are defined in java.util.zip.Deflater).
static byte[]	decompress(byte[] value) Decompress the byte array previously returned by compress
void	flush()
GHPoint	get(long index)
CompressedArray	setCompressionLevel(int compressionLevel)
void	write(double lat, double lon)

Methods inherited from class java.lang.Object

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

Constructor Detail

CompressedArray

public CompressedArray()

CompressedArray

public CompressedArray(int _segments,
                       int entriesPerSeg,
                       int approxBytesPerEntry)

Parameters:

_segments - initialize with this number of segments

entriesPerSeg - a static number which sets the entries per segment

approxBytesPerEntry - an *approximate* number (as entries can have different lengths)

Method Detail

compress

public static byte[] compress(byte[] value,
                              int offset,
                              int length,
                              int compressionLevel)

Compresses the specified byte range using the specified compressionLevel (constants are defined in java.util.zip.Deflater).

decompress

public static byte[] decompress(byte[] value)
                         throws DataFormatException

Decompress the byte array previously returned by compress

Throws:

DataFormatException

setCompressionLevel

public CompressedArray setCompressionLevel(int compressionLevel)

write

public void write(double lat,
                  double lon)

get

public GHPoint get(long index)

flush

public void flush()

calcMemInMB

public float calcMemInMB()