com.graphhopper.search

Class EdgeKVStorage

java.lang.Object

com.graphhopper.search.EdgeKVStorage

public class EdgeKVStorage
extends Object

This class stores key-value pairs in an append-only manner.

Author:

Peter Karich

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EdgeKVStorage.KeyValue

Constructor Summary

Constructors

Constructor and Description
EdgeKVStorage(Directory dir) Specify a larger cacheSize to reduce disk usage.

Method Summary

Modifier and Type	Method and Description
long	add(List<EdgeKVStorage.KeyValue> entries) This method writes the specified entryMap (key-value pairs) into the storage.
void	close()
EdgeKVStorage	create(long initBytes)
static String	cutString(String value) This method limits the specified String value to the length currently accepted for values in the EdgeKVStorage.
void	flush()
Object	get(long entryPointer, String key, boolean reverse)
List<EdgeKVStorage.KeyValue>	getAll(long entryPointer)
long	getCapacity()
boolean	isClosed()
boolean	loadExisting()

Methods inherited from class java.lang.Object

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

Constructor Detail

EdgeKVStorage

public EdgeKVStorage(Directory dir)

Specify a larger cacheSize to reduce disk usage. Note that this increases the memory usage of this object.

Method Detail

create

public EdgeKVStorage create(long initBytes)

loadExisting

public boolean loadExisting()

add

public long add(List<EdgeKVStorage.KeyValue> entries)

This method writes the specified entryMap (key-value pairs) into the storage. Please note that null keys or null values are rejected. The Class of a value can be only: byte[], String, int, long, float or double (or more precisely, their wrapper equivalent). For all other types an exception is thrown. The first call of add assigns a Class to every key in the Map and future calls of add will throw an exception if this Class differs.

Returns:

entryPointer with which you can later fetch the entryMap via the get or getAll method

getAll

public List<EdgeKVStorage.KeyValue> getAll(long entryPointer)

get

public Object get(long entryPointer,
                  String key,
                  boolean reverse)

flush

public void flush()

close

public void close()

isClosed

public boolean isClosed()

getCapacity

public long getCapacity()

cutString

public static String cutString(String value)

This method limits the specified String value to the length currently accepted for values in the EdgeKVStorage.