com.graphhopper.storage

Class DAType

java.lang.Object

com.graphhopper.storage.DAType

public class DAType
extends Object

Defines how a DataAccess object is created.

Author:

Peter Karich

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DAType.MemRef

Field Summary

Fields

Modifier and Type	Field and Description
static DAType	MMAP Memory mapped DA object.
static DAType	MMAP_RO Read-only memory mapped DA object.
static DAType	RAM The DA object is hold entirely in-memory.
static DAType	RAM_INT Optimized RAM DA type for integer access.
static DAType	RAM_INT_STORE Optimized RAM_STORE DA type for integer access.
static DAType	RAM_STORE The DA object is hold entirely in-memory.

Constructor Summary

Constructors

Constructor and Description
DAType(DAType.MemRef memRef, boolean storing, boolean integ, boolean allowWrites)
DAType(DAType type)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object obj)
static DAType	fromString(String dataAccess)
static DAType	getPreferredInt(DAType type) This method returns RAM_INT if the specified type is in-memory.
int	hashCode()
boolean	isAllowWrites()
boolean	isInMemory()
boolean	isInteg() Optimized for integer values? default is false
boolean	isMMap()
boolean	isStoring() Temporary data or store (with loading and storing)? default is false
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

RAM

public static final DAType RAM

The DA object is hold entirely in-memory. Loading and flushing is a no-op. See RAMDataAccess.

RAM_INT

public static final DAType RAM_INT

Optimized RAM DA type for integer access. The set and getBytes methods cannot be used.

RAM_STORE

public static final DAType RAM_STORE

The DA object is hold entirely in-memory. It will read load disc and flush to it if they equivalent methods are called. See RAMDataAccess.

RAM_INT_STORE

public static final DAType RAM_INT_STORE

Optimized RAM_STORE DA type for integer access. The set and getBytes methods cannot be used.

MMAP

public static final DAType MMAP

Memory mapped DA object. See MMapDataAccess.

MMAP_RO

public static final DAType MMAP_RO

Read-only memory mapped DA object. To avoid write access useful for reading on mobile or embedded data stores.

Constructor Detail

DAType

public DAType(DAType type)

DAType

public DAType(DAType.MemRef memRef,
              boolean storing,
              boolean integ,
              boolean allowWrites)

Method Detail

fromString

public static DAType fromString(String dataAccess)

getPreferredInt

public static DAType getPreferredInt(DAType type)

This method returns RAM_INT if the specified type is in-memory.

isAllowWrites

public boolean isAllowWrites()

isInMemory

public boolean isInMemory()

Returns:

true if data resides in the JVM heap.

isMMap

public boolean isMMap()

isStoring

public boolean isStoring()

Temporary data or store (with loading and storing)? default is false

isInteg

public boolean isInteg()

Optimized for integer values? default is false

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object