Package graphql.schema

Interface GraphQLTypeVisitor

All Known Implementing Classes:

AppliedDirectiveArgumentsAreValid, AppliedDirectivesAreValid, CodeRegistryVisitor, DefaultValuesAreValid, GraphQLTypeCollectingVisitor, GraphQLTypeResolvingVisitor, GraphQLTypeVisitorStub, InputAndOutputTypesUsedAppropriately, MultiReadOnlyGraphQLTypeVisitor, NoUnbrokenInputCycles, TypeAndFieldRule, TypesImplementInterfaces

@PublicApi
public interface GraphQLTypeVisitor

GraphQLTypeVisitor can be used to visit all the elements of a schema (types, fields, directives and so on) in a visitor pattern.

See Also:

GraphQLTypeVisitorStub

Method Summary

Modifier and Type	Method	Description
default TraversalControl	changeNode(TraverserContext<GraphQLSchemaElement> context, GraphQLSchemaElement newChangedNode)	This helper method can be used to "change" a node when returning control from this visitor
default TraversalControl	deleteNode(TraverserContext<GraphQLSchemaElement> context)	This helper method can be used to "delete" the current node when returning control from this visitor
default TraversalControl	insertAfter(TraverserContext<GraphQLSchemaElement> context, GraphQLSchemaElement toInsertAfter)	This helper method can be used to "insert a new node" AFTER the current node when returning control from this visitor
default TraversalControl	insertBefore(TraverserContext<GraphQLSchemaElement> context, GraphQLSchemaElement toInsertBefore)	This helper method can be used to "insert a new node" BEFORE the current node when returning control from this visitor
default TraversalControl	visitBackRef(TraverserContext<GraphQLSchemaElement> context)	Called when a node is visited more than once within a context.
default TraversalControl	visitGraphQLAppliedDirective(GraphQLAppliedDirective node, TraverserContext<GraphQLSchemaElement> context)	This method will be called when a directive is applied to a schema element.
default TraversalControl	visitGraphQLAppliedDirectiveArgument(GraphQLAppliedDirectiveArgument node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLArgument(GraphQLArgument node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLCompositeType(GraphQLCompositeType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLDirective(GraphQLDirective node, TraverserContext<GraphQLSchemaElement> context)	This method will be called twice.
default TraversalControl	visitGraphQLDirectiveContainer(GraphQLDirectiveContainer node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLEnumType(GraphQLEnumType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLEnumValueDefinition(GraphQLEnumValueDefinition node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLFieldDefinition(GraphQLFieldDefinition node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLFieldsContainer(GraphQLFieldsContainer node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLInputFieldsContainer(GraphQLInputFieldsContainer node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLInputObjectField(GraphQLInputObjectField node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLInputObjectType(GraphQLInputObjectType node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLInputType(GraphQLInputType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLInterfaceType(GraphQLInterfaceType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLList(GraphQLList node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLModifiedType(GraphQLModifiedType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLNonNull(GraphQLNonNull node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLNullableType(GraphQLNullableType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLObjectType(GraphQLObjectType node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLOutputType(GraphQLOutputType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLScalarType(GraphQLScalarType node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLTypeReference(GraphQLTypeReference node, TraverserContext<GraphQLSchemaElement> context)
TraversalControl	visitGraphQLUnionType(GraphQLUnionType node, TraverserContext<GraphQLSchemaElement> context)
default TraversalControl	visitGraphQLUnmodifiedType(GraphQLUnmodifiedType node, TraverserContext<GraphQLSchemaElement> context)

Method Detail

visitGraphQLAppliedDirective

default TraversalControl visitGraphQLAppliedDirective(GraphQLAppliedDirective node,
                                                      TraverserContext<GraphQLSchemaElement> context)

This method will be called when a directive is applied to a schema element. The TraverserContext.getParentNode() will be the schema element that this is applied to. The graphql-java code base is trying to slowly move away from using GraphQLDirectives when they really should be GraphQLAppliedDirectives

Parameters:

node - the applied directive

context - the traversal context

Returns:

how to control the visitation processing

visitGraphQLAppliedDirectiveArgument

default TraversalControl visitGraphQLAppliedDirectiveArgument(GraphQLAppliedDirectiveArgument node,
                                                              TraverserContext<GraphQLSchemaElement> context)

visitGraphQLArgument

TraversalControl visitGraphQLArgument(GraphQLArgument node,
                                      TraverserContext<GraphQLSchemaElement> context)

visitGraphQLDirective

TraversalControl visitGraphQLDirective(GraphQLDirective node,
                                       TraverserContext<GraphQLSchemaElement> context)

This method will be called twice. Once for a directive definition in a schema and then do each time a directive is applied to a schema element When it's applied to a schema element then TraverserContext.getParentNode() will be the schema element that this is applied to. The graphql-java code base is trying to slowly move away from using GraphQLDirectives when they really should be GraphQLAppliedDirectives and this is another place that has been left in. In the future this behavior will change and this will only visit directive definitions of a schema, not where they are applied.

Parameters:

node - the directive

context - the traversal context

Returns:

how to control the visitation processing

visitGraphQLEnumType

TraversalControl visitGraphQLEnumType(GraphQLEnumType node,
                                      TraverserContext<GraphQLSchemaElement> context)

visitGraphQLEnumValueDefinition

TraversalControl visitGraphQLEnumValueDefinition(GraphQLEnumValueDefinition node,
                                                 TraverserContext<GraphQLSchemaElement> context)

visitGraphQLFieldDefinition

TraversalControl visitGraphQLFieldDefinition(GraphQLFieldDefinition node,
                                             TraverserContext<GraphQLSchemaElement> context)

visitGraphQLInputObjectField

TraversalControl visitGraphQLInputObjectField(GraphQLInputObjectField node,
                                              TraverserContext<GraphQLSchemaElement> context)

visitGraphQLInputObjectType

TraversalControl visitGraphQLInputObjectType(GraphQLInputObjectType node,
                                             TraverserContext<GraphQLSchemaElement> context)

visitGraphQLInterfaceType

TraversalControl visitGraphQLInterfaceType(GraphQLInterfaceType node,
                                           TraverserContext<GraphQLSchemaElement> context)

visitGraphQLList

TraversalControl visitGraphQLList(GraphQLList node,
                                  TraverserContext<GraphQLSchemaElement> context)

visitGraphQLNonNull

TraversalControl visitGraphQLNonNull(GraphQLNonNull node,
                                     TraverserContext<GraphQLSchemaElement> context)

visitGraphQLObjectType

TraversalControl visitGraphQLObjectType(GraphQLObjectType node,
                                        TraverserContext<GraphQLSchemaElement> context)

visitGraphQLScalarType

TraversalControl visitGraphQLScalarType(GraphQLScalarType node,
                                        TraverserContext<GraphQLSchemaElement> context)

visitGraphQLTypeReference

TraversalControl visitGraphQLTypeReference(GraphQLTypeReference node,
                                           TraverserContext<GraphQLSchemaElement> context)

visitGraphQLUnionType

TraversalControl visitGraphQLUnionType(GraphQLUnionType node,
                                       TraverserContext<GraphQLSchemaElement> context)

visitBackRef

default TraversalControl visitBackRef(TraverserContext<GraphQLSchemaElement> context)

Called when a node is visited more than once within a context. TraverserContext.thisNode() contains the node

Parameters:

context - the traversal context

Returns:

by default CONTINUE

visitGraphQLCompositeType

default TraversalControl visitGraphQLCompositeType(GraphQLCompositeType node,
                                                   TraverserContext<GraphQLSchemaElement> context)

visitGraphQLDirectiveContainer

default TraversalControl visitGraphQLDirectiveContainer(GraphQLDirectiveContainer node,
                                                        TraverserContext<GraphQLSchemaElement> context)

visitGraphQLFieldsContainer

default TraversalControl visitGraphQLFieldsContainer(GraphQLFieldsContainer node,
                                                     TraverserContext<GraphQLSchemaElement> context)

visitGraphQLInputFieldsContainer

default TraversalControl visitGraphQLInputFieldsContainer(GraphQLInputFieldsContainer node,
                                                          TraverserContext<GraphQLSchemaElement> context)

visitGraphQLInputType

default TraversalControl visitGraphQLInputType(GraphQLInputType node,
                                               TraverserContext<GraphQLSchemaElement> context)

visitGraphQLModifiedType

default TraversalControl visitGraphQLModifiedType(GraphQLModifiedType node,
                                                  TraverserContext<GraphQLSchemaElement> context)

visitGraphQLNullableType

default TraversalControl visitGraphQLNullableType(GraphQLNullableType node,
                                                  TraverserContext<GraphQLSchemaElement> context)

visitGraphQLOutputType

default TraversalControl visitGraphQLOutputType(GraphQLOutputType node,
                                                TraverserContext<GraphQLSchemaElement> context)

visitGraphQLUnmodifiedType

default TraversalControl visitGraphQLUnmodifiedType(GraphQLUnmodifiedType node,
                                                    TraverserContext<GraphQLSchemaElement> context)

changeNode

default TraversalControl changeNode(TraverserContext<GraphQLSchemaElement> context,
                                    GraphQLSchemaElement newChangedNode)

This helper method can be used to "change" a node when returning control from this visitor

Parameters:

context - the current traversal context

newChangedNode - the new to be changed at this place

Returns:

this will always sent back TraversalControl.CONTINUE

deleteNode

default TraversalControl deleteNode(TraverserContext<GraphQLSchemaElement> context)

This helper method can be used to "delete" the current node when returning control from this visitor

Parameters:

context - the current traversal context which is pointing to the current node to be deleted

Returns:

this will always sent back TraversalControl.CONTINUE

insertAfter

default TraversalControl insertAfter(TraverserContext<GraphQLSchemaElement> context,
                                     GraphQLSchemaElement toInsertAfter)

This helper method can be used to "insert a new node" AFTER the current node when returning control from this visitor

Parameters:

context - the current traversal context

toInsertAfter - the new to be inserted AFTER this current code

Returns:

this will always sent back TraversalControl.CONTINUE

insertBefore

default TraversalControl insertBefore(TraverserContext<GraphQLSchemaElement> context,
                                      GraphQLSchemaElement toInsertBefore)

This helper method can be used to "insert a new node" BEFORE the current node when returning control from this visitor

Parameters:

context - the current traversal context

toInsertBefore - the new to be inserted BEFORE this current code

Returns:

this will always sent back TraversalControl.CONTINUE