com.devexperts.qd.kit

Class DefaultScheme

java.lang.Object

com.devexperts.qd.kit.DefaultScheme

All Implemented Interfaces:

DataScheme

public class DefaultScheme
extends Object
implements DataScheme

The DefaultScheme is a basic implementation of data scheme. It uses record identifier and CompactInt format for record identity serialization. Note, that this implementation works only with records that are derived from DefaultRecord class and fields that are derived from AbstractDataIntField and AbstractDataObjField classes.

Field Summary

Fields

Modifier and Type	Field and Description
protected SymbolCodec	codec
protected String	digest
protected com.devexperts.logging.Logging	log
protected DefaultRecord[]	records

Constructor Summary

Constructors

Constructor and Description
DefaultScheme(SymbolCodec codec, DataRecord... records)

Method Summary

Modifier and Type	Method and Description
static String	calculateDigest(DataScheme scheme)
AbstractDataIntField	findIntFieldByName(String name) Returns Int-field by its full name.
AbstractDataObjField	findObjFieldByName(String name) Returns Obj-field by its full name.
DefaultRecord	findRecordByName(String name) Returns data record by its name.
SymbolCodec	getCodec() Returns symbol codec used in this scheme.
String	getDigest() Returns digest of the scheme.
DefaultRecord	getRecord(int index) Returns data record by its index within this scheme.
int	getRecordCount() Returns number of records in this scheme.
<T> T	getService(Class<T> serviceClass) Extension point for additional scheme-specific services.
static void	setParentReferences(DataScheme scheme) Deprecated. No replacement. Just remove usages of this method. DefaultScheme(SymbolCodec, DataRecord[]) constructor now does it automatically.
String	toString()
static void	verifyScheme(DataScheme scheme) Deprecated. No replacement. Just remove usages of this method. DefaultScheme(SymbolCodec, DataRecord[]) constructor does it all automatically.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected final com.devexperts.logging.Logging log

codec

protected final SymbolCodec codec

records

protected final DefaultRecord[] records

digest

protected String digest

Constructor Detail

DefaultScheme

public DefaultScheme(SymbolCodec codec,
                     DataRecord... records)

Method Detail

getCodec

public final SymbolCodec getCodec()

Description copied from interface: DataScheme

Returns symbol codec used in this scheme.

Specified by:

getCodec in interface DataScheme

getRecordCount

public final int getRecordCount()

Description copied from interface: DataScheme

Returns number of records in this scheme.

Specified by:

getRecordCount in interface DataScheme

getRecord

public final DefaultRecord getRecord(int index)

Description copied from interface: DataScheme

Returns data record by its index within this scheme. The record index in the scheme coincides with its identifier and is also used for identification of data record in serialized form.

Specified by:

getRecord in interface DataScheme

findRecordByName

public final DefaultRecord findRecordByName(String name)

Description copied from interface: DataScheme

Returns data record by its name. Returns null if no such records exists.

Specified by:

findRecordByName in interface DataScheme

findIntFieldByName

public final AbstractDataIntField findIntFieldByName(String name)

Description copied from interface: DataScheme

Returns Int-field by its full name. Returns null if no such fields exists.

Specified by:

findIntFieldByName in interface DataScheme

findObjFieldByName

public final AbstractDataObjField findObjFieldByName(String name)

Description copied from interface: DataScheme

Returns Obj-field by its full name. Returns null if no such fields exists.

Specified by:

findObjFieldByName in interface DataScheme

getService

public <T> T getService(Class<T> serviceClass)

Description copied from interface: DataScheme

Extension point for additional scheme-specific services. The following services are now supported:

• QDFilterFactory
• HistorySubscriptionFilter
• QDErrorHandler

This method returns null if no scheme-specific override for the corresponding service is found.

Default implementation in DefaultScheme is to use Services.createService(java.lang.Class<T>, java.lang.ClassLoader, java.lang.String) with this scheme's class loader.

Specified by:

getService in interface DataScheme

getDigest

public String getDigest()

Description copied from interface: DataScheme

Returns digest of the scheme.

Returns null by default.

Specified by:

getDigest in interface DataScheme

Returns:

Digest of the scheme.

toString

public String toString()

Overrides:

toString in class Object

setParentReferences

public static void setParentReferences(DataScheme scheme)

Deprecated. No replacement. Just remove usages of this method. DefaultScheme(SymbolCodec, DataRecord[]) constructor now does it automatically.

Sets references to corresponding parent entities in the specified scheme. Requires that scheme is instance of DefaultScheme.

Throws:

ClassCastException - if scheme is not an instance of DefaultScheme.

IllegalStateException - if some parent reference already set to different instance.

verifyScheme

public static void verifyScheme(DataScheme scheme)

Deprecated. No replacement. Just remove usages of this method. DefaultScheme(SymbolCodec, DataRecord[]) constructor does it all automatically.

This method does nothing.

calculateDigest

public static String calculateDigest(DataScheme scheme)