org.opendaylight.yangtools.yang.model.util

Class SchemaContextUtil

java.lang.Object

org.opendaylight.yangtools.yang.model.util.SchemaContextUtil

public final class SchemaContextUtil
extends Object

The Schema Context Util contains support methods for searching through Schema Context modules for specified schema nodes via Schema Path or Revision Aware XPath. The Schema Context Util is designed as mixin, so it is not instantiable.

Method Summary

Modifier and Type	Method and Description
static SchemaNode	findDataSchemaNode(SchemaContext context, Module module, RevisionAwareXPath nonCondXPath) Method attempts to find DataSchemaNode inside of provided Schema Context and Yang Module accordingly to Non-conditional Revision Aware XPath.
static SchemaNode	findDataSchemaNode(SchemaContext context, SchemaPath schemaPath) Method attempts to find DataSchemaNode in Schema Context via specified Schema Path.
static SchemaNode	findDataSchemaNodeForRelativeXPath(SchemaContext context, Module module, SchemaNode actualSchemaNode, RevisionAwareXPath relativeXPath) Method attempts to find DataSchemaNode inside of provided Schema Context and Yang Module accordingly to Non-conditional relative Revision Aware XPath.
static SchemaNode	findNodeInSchemaContext(SchemaContext context, Iterable<QName> path)
static Module	findParentModule(SchemaContext context, SchemaNode schemaNode) Returns parent Yang Module for specified Schema Context in which Schema Node is declared.
static TypeDefinition<?>	getBaseTypeForLeafRef(LeafrefTypeDefinition typeDefinition, SchemaContext schemaContext, QName qname) Returns base type for typeDefinition which belongs to module specified via qname.
static TypeDefinition<?>	getBaseTypeForLeafRef(LeafrefTypeDefinition typeDefinition, SchemaContext schemaContext, SchemaNode schema) Extracts the base type of node on which schema node points to.
static NotificationDefinition	getNotificationSchema(SchemaContext schema, SchemaPath path) Returns NotificationDefinition from Schema Context.
static ContainerSchemaNode	getRpcDataSchema(SchemaContext schema, SchemaPath path) Returns RPC Input or Output Data container from RPC definition.

Methods inherited from class java.lang.Object

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

Method Detail

findDataSchemaNode

public static SchemaNode findDataSchemaNode(SchemaContext context,
                                            SchemaPath schemaPath)

Method attempts to find DataSchemaNode in Schema Context via specified Schema Path. The returned DataSchemaNode from method will be the node at the end of the SchemaPath. If the DataSchemaNode is not present in the Schema Context the method will return null.
In case that Schema Context or Schema Path are not specified correctly (i.e. contains null values) the method will throw IllegalArgumentException.

Parameters:

context - Schema Context

schemaPath - Schema Path to search for

Returns:

SchemaNode from the end of the Schema Path or null if the Node is not present.

Throws:

IllegalArgumentException - if context or schemaPath is not correct.

findDataSchemaNode

public static SchemaNode findDataSchemaNode(SchemaContext context,
                                            Module module,
                                            RevisionAwareXPath nonCondXPath)

Method attempts to find DataSchemaNode inside of provided Schema Context and Yang Module accordingly to Non-conditional Revision Aware XPath. The specified Module MUST be present in Schema Context otherwise the operation would fail and return null.
The Revision Aware XPath MUST be specified WITHOUT the conditional statement (i.e. without [cond]) in path, because in this state the Schema Context is completely unaware of data state and will be not able to properly resolve XPath. If the XPath contains condition the method will return IllegalArgumentException.
In case that Schema Context or Module or Revision Aware XPath contains null references the method will throw IllegalArgumentException
If the Revision Aware XPath is correct and desired Data Schema Node is present in Yang module or in depending module in Schema Context the method will return specified Data Schema Node, otherwise the operation will fail and method will return null.

Parameters:

context - Schema Context

module - Yang Module

nonCondXPath - Non Conditional Revision Aware XPath

Returns:

Returns Data Schema Node for specified Schema Context for given Non-conditional Revision Aware XPath, or null if the DataSchemaNode is not present in Schema Context.

findDataSchemaNodeForRelativeXPath

public static SchemaNode findDataSchemaNodeForRelativeXPath(SchemaContext context,
                                                            Module module,
                                                            SchemaNode actualSchemaNode,
                                                            RevisionAwareXPath relativeXPath)

Method attempts to find DataSchemaNode inside of provided Schema Context and Yang Module accordingly to Non-conditional relative Revision Aware XPath. The specified Module MUST be present in Schema Context otherwise the operation would fail and return null.
The relative Revision Aware XPath MUST be specified WITHOUT the conditional statement (i.e. without [cond]) in path, because in this state the Schema Context is completely unaware of data state and will be not able to properly resolve XPath. If the XPath contains condition the method will return IllegalArgumentException.
The Actual Schema Node MUST be specified correctly because from this Schema Node will search starts. If the Actual Schema Node is not correct the operation will simply fail, because it will be unable to find desired DataSchemaNode.
In case that Schema Context or Module or Actual Schema Node or relative Revision Aware XPath contains null references the method will throw IllegalArgumentException
If the Revision Aware XPath doesn't have flag isAbsolute == false the method will throw IllegalArgumentException.
If the relative Revision Aware XPath is correct and desired Data Schema Node is present in Yang module or in depending module in Schema Context the method will return specified Data Schema Node, otherwise the operation will fail and method will return null.

Parameters:

context - Schema Context

module - Yang Module

actualSchemaNode - Actual Schema Node

relativeXPath - Relative Non Conditional Revision Aware XPath

Returns:

DataSchemaNode if is present in specified Schema Context for given relative Revision Aware XPath, otherwise will return null.

findParentModule

public static Module findParentModule(SchemaContext context,
                                      SchemaNode schemaNode)

Returns parent Yang Module for specified Schema Context in which Schema Node is declared. If the Schema Node is not present in Schema Context the operation will return null.
If Schema Context or Schema Node contains null references the method will throw IllegalArgumentException

Parameters:

context - Schema Context

schemaNode - Schema Node

Returns:

Yang Module for specified Schema Context and Schema Node, if Schema Node is NOT present, the method will return null

findNodeInSchemaContext

public static SchemaNode findNodeInSchemaContext(SchemaContext context,
                                                 Iterable<QName> path)

getNotificationSchema

@Beta
 @Nullable
public static NotificationDefinition getNotificationSchema(@Nonnull
                                                                            SchemaContext schema,
                                                                            @Nonnull
                                                                            SchemaPath path)

Returns NotificationDefinition from Schema Context.

Parameters:

schema - SchemaContext in which lookup should be performed.

path - Schema Path of notification

Returns:

Notification schema or null, if notification is not present in schema context.

getRpcDataSchema

@Beta
 @Nullable
public static ContainerSchemaNode getRpcDataSchema(@Nonnull
                                                                    SchemaContext schema,
                                                                    @Nonnull
                                                                    SchemaPath path)

Returns RPC Input or Output Data container from RPC definition.

Parameters:

schema - SchemaContext in which lookup should be performed.

path - Schema path of RPC input/output data container

Returns:

Notification schema or null, if notification is not present in schema context.

getBaseTypeForLeafRef

public static TypeDefinition<?> getBaseTypeForLeafRef(LeafrefTypeDefinition typeDefinition,
                                                      SchemaContext schemaContext,
                                                      SchemaNode schema)

Extracts the base type of node on which schema node points to. If target node is again of type LeafrefTypeDefinition, methods will be call recursively until it reach concrete type definition.

Parameters:

typeDefinition - type of node which will be extracted

schemaContext - Schema Context

schema - Schema Node

Returns:

recursively found type definition this leafref is pointing to or null if the xpath is incorrect (null is there to preserve backwards compatibility)

getBaseTypeForLeafRef

public static TypeDefinition<?> getBaseTypeForLeafRef(LeafrefTypeDefinition typeDefinition,
                                                      SchemaContext schemaContext,
                                                      QName qname)

Returns base type for typeDefinition which belongs to module specified via qname. This handle the case when leafref type isn't specified as type substatement of leaf or leaf-list but is defined in other module as typedef which is then imported to referenced module.

Because typeDefinition is definied via typedef statement, only absolute path is meaningful.