Package it.bancaditalia.oss.vtl.impl.session

Class VTLSessionImpl

java.lang.Object

it.bancaditalia.oss.vtl.impl.session.VTLSessionImpl

All Implemented Interfaces:

TransformationScheme, VTLSession

public class VTLSessionImpl
extends Object
implements VTLSession

Constructor Summary

Constructors

Constructor	Description
VTLSessionImpl()

Method Summary

Modifier and Type	Method	Description
VTLSessionImpl	addStatements(InputStream inputStream, Charset charset)	Adds some VTL statements to this session.
VTLSessionImpl	addStatements(Reader reader)	Adds some VTL statements to this session.
VTLSessionImpl	addStatements(String statements)	Adds some VTL statements to this session.
VTLSessionImpl	addStatements(Path path, Charset charset)	Adds some VTL statements to this session.
List<VTLValueMetadata>	compile()	Compile all the VTL code submitted to this session, and returns the metadata of all the objects contained in this session.
boolean	contains(String alias)	Determine if an alias is defined in this TransformationScheme.
Engine	getEngine()
VTLValueMetadata	getMetadata(String alias)	Searches and retrieves metadata for value, referred by an alias defined in this TransformationScheme.
List<String>	getNodes()
MetadataRepository	getRepository()
Statement	getRule(String alias)	Returns a structure a rule referred by an alias defined in this TransformationScheme.
Map<String,String>	getStatements()
List<List<String>>	getTopology()
Workspace	getWorkspace()
Optional<Lineage>	linkLineage(String alias)	Tries to resolve a lineage link specified by a given alias for a VTL rule defined in this scheme.
VTLValue	resolve(String alias)	Searches and retrieves a value, referred by an alias defined in this TransformationScheme.

Methods inherited from class java.lang.Object

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

Methods inherited from interface it.bancaditalia.oss.vtl.model.transform.TransformationScheme

eval, getParent, resolve

Constructor Detail

VTLSessionImpl

public VTLSessionImpl()

Method Detail

addStatements

public VTLSessionImpl addStatements(String statements)

Description copied from interface: VTLSession

Adds some VTL statements to this session. Code is parsed but not compiled.

Specified by:

addStatements in interface VTLSession

Parameters:

statements - A string containing the statements to add

Returns:

this instance.

addStatements

public VTLSessionImpl addStatements(Reader reader)
                             throws IOException

Description copied from interface: VTLSession

Adds some VTL statements to this session. Code is parsed but not compiled. The Reader will be consumed entirely and closed.

Specified by:

addStatements in interface VTLSession

Parameters:

reader - a Reader which provides the VTL statements to add.

Returns:

this instance.

Throws:

IOException

addStatements

public VTLSessionImpl addStatements(InputStream inputStream,
                                    Charset charset)
                             throws IOException

Description copied from interface: VTLSession

Adds some VTL statements to this session. Code is parsed but not compiled. The InputStream will be consumed entirely and closed.

Specified by:

addStatements in interface VTLSession

Parameters:

inputStream - an InputStream which provides the VTL statements to add

charset - a Charset instance which will be used to interpret the stream contents.

Returns:

this instance.

Throws:

IOException

addStatements

public VTLSessionImpl addStatements(Path path,
                                    Charset charset)
                             throws IOException

Description copied from interface: VTLSession

Adds some VTL statements to this session. Code is parsed but not compiled.

Specified by:

addStatements in interface VTLSession

Parameters:

path - a Path describing the position of a local file which provides the VTL statements to add

charset - a Charset instance which will be used to interpret the file contents.

Returns:

this instance.

Throws:

IOException

resolve

public VTLValue resolve(String alias)

Description copied from interface: TransformationScheme

Searches and retrieves a value, referred by an alias defined in this TransformationScheme.

Specified by:

resolve in interface TransformationScheme

Parameters:

alias - The alias whose value is to be retrieved.

Returns:

The VTLValue if the alias is found.

getMetadata

public VTLValueMetadata getMetadata(String alias)

Description copied from interface: TransformationScheme

Searches and retrieves metadata for value, referred by an alias defined in this TransformationScheme.

Specified by:

getMetadata in interface TransformationScheme

Parameters:

alias - the alias whose value is to be retrieved.

Returns:

the metadata of the value if the alias is found.

contains

public boolean contains(String alias)

Description copied from interface: TransformationScheme

Determine if an alias is defined in this TransformationScheme.

Specified by:

contains in interface TransformationScheme

Parameters:

alias - the alias whose value is to be retrieved.

Returns:

whether the alias is defined or not.

compile

public List<VTLValueMetadata> compile()

Description copied from interface: VTLSession

Compile all the VTL code submitted to this session, and returns the metadata of all the objects contained in this session.

Specified by:

compile in interface VTLSession

Returns:

a List of VTLValueMetadata instances, describing a VTL object each.

getStatements

public Map<String,String> getStatements()

getNodes

public List<String> getNodes()

getTopology

public List<List<String>> getTopology()

getRule

public Statement getRule(String alias)

Description copied from interface: TransformationScheme

Returns a structure a rule referred by an alias defined in this TransformationScheme.

Specified by:

getRule in interface TransformationScheme

Parameters:

alias - the alias of the rule whose structure is to be retrieved.

Returns:

a Statement instance describing the rule if found.

getRepository

public MetadataRepository getRepository()

Specified by:

getRepository in interface TransformationScheme

Returns:

The MetadataRepository instance used by this TransformationScheme.

getEngine

public Engine getEngine()

Specified by:

getEngine in interface VTLSession

Returns:

the computing Engine used by this session

getWorkspace

public Workspace getWorkspace()

Specified by:

getWorkspace in interface VTLSession

Returns:

the Workspace used by this session

linkLineage

public Optional<Lineage> linkLineage(String alias)

Description copied from interface: TransformationScheme

Tries to resolve a lineage link specified by a given alias for a VTL rule defined in this scheme.

Specified by:

linkLineage in interface TransformationScheme

Parameters:

alias - The alias referring to a rule

Returns:

The lineage link