graphql.schema

Interface DataFetchingFieldSelectionSet

All Superinterfaces:

java.util.function.Supplier<MergedSelectionSet>

All Known Implementing Classes:

DataFetchingFieldSelectionSetImpl

public interface DataFetchingFieldSelectionSet
extends java.util.function.Supplier<MergedSelectionSet>

This allows you to retrieve the selection set of fields that have been asked for when the DataFetcher was invoked. For example imagine we are fetching the field 'user' in the following query

 

  {
      user {
          name
          age
          weight
          friends {
              name
          }
      }
  }
 
 

The selection set in the case above consists of the fields "name, age, weight, friends and friends/name". You can use this selection set perhaps to "peek" ahead and decide that field values you might need from the underlying data system. Imagine a SQL system where this might represent the SQL 'projection' of columns say.

Method Summary

Modifier and Type	Method and Description
boolean	contains(java.lang.String fieldGlobPattern) This will return true if the field selection set matches a specified "glob" pattern matching ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String).
boolean	containsAllOf(java.lang.String fieldGlobPattern, java.lang.String... fieldGlobPatterns) This will return true if the field selection set matches all of the specified "glob" pattern matches ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String).
boolean	containsAnyOf(java.lang.String fieldGlobPattern, java.lang.String... fieldGlobPatterns) This will return true if the field selection set matches any of the specified "glob" pattern matches ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String).
MergedSelectionSet	get()
java.util.Map<java.lang.String,java.util.Map<java.lang.String,java.lang.Object>>	getArguments()
java.util.Map<java.lang.String,GraphQLFieldDefinition>	getDefinitions()
SelectedField	getField(java.lang.String fqFieldName) This will return a selected field using the fully qualified field name.
java.util.List<SelectedField>	getFields() This will return all selected fields.
java.util.List<SelectedField>	getFields(java.lang.String fieldGlobPattern) This will return a list of selected fields that match a specified "glob" pattern matching ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String).

Method Detail

get

MergedSelectionSet get()

Specified by:

get in interface java.util.function.Supplier<MergedSelectionSet>

Returns:

a map of the fields that represent the selection set

getArguments

java.util.Map<java.lang.String,java.util.Map<java.lang.String,java.lang.Object>> getArguments()

Returns:

a map of the arguments for each field in the selection set

getDefinitions

java.util.Map<java.lang.String,GraphQLFieldDefinition> getDefinitions()

Returns:

a map of the GraphQLFieldDefinitions for each field in the selection set

contains

boolean contains(java.lang.String fieldGlobPattern)

This will return true if the field selection set matches a specified "glob" pattern matching ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String). This will allow you to use '*', '**' and '?' as special matching characters such that "invoice/customer*" would match an invoice field with child fields that start with 'customer'.

Parameters:

fieldGlobPattern - the glob pattern to match fields against

Returns:

true if the selection set contains these fields

See Also:

FileSystem.getPathMatcher(String)

containsAnyOf

boolean containsAnyOf(java.lang.String fieldGlobPattern,
                      java.lang.String... fieldGlobPatterns)

This will return true if the field selection set matches any of the specified "glob" pattern matches ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String). This will allow you to use '*', '**' and '?' as special matching characters such that "invoice/customer*" would match an invoice field with child fields that start with 'customer'.

Parameters:

fieldGlobPattern - the glob pattern to match fields against

fieldGlobPatterns - optionally more glob pattern to match fields against

Returns:

true if the selection set contains any of these these fields

See Also:

FileSystem.getPathMatcher(String)

containsAllOf

boolean containsAllOf(java.lang.String fieldGlobPattern,
                      java.lang.String... fieldGlobPatterns)

This will return true if the field selection set matches all of the specified "glob" pattern matches ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String). This will allow you to use '*', '**' and '?' as special matching characters such that "invoice/customer*" would match an invoice field with child fields that start with 'customer'.

Parameters:

fieldGlobPattern - the glob pattern to match fields against

fieldGlobPatterns - optionally more glob pattern to match fields against

Returns:

true if the selection set contains all of these these fields

See Also:

FileSystem.getPathMatcher(String)

getFields

java.util.List<SelectedField> getFields()

This will return all selected fields. The fields are guaranteed to be in pre-order as they appear in the query.

Returns:

a list of all selected fields or empty list if none match

getFields

java.util.List<SelectedField> getFields(java.lang.String fieldGlobPattern)

This will return a list of selected fields that match a specified "glob" pattern matching ie the glob pattern matching supported by FileSystem.getPathMatcher(java.lang.String). This will allow you to use '*', '**' and '?' as special matching characters such that "invoice/customer*" would match an invoice field with child fields that start with 'customer'. The fields are guaranteed to be in pre-order as they appear in the query.

Parameters:

fieldGlobPattern - the glob pattern to match fields against

Returns:

a list of selected fields or empty list if none match

getField

SelectedField getField(java.lang.String fqFieldName)

This will return a selected field using the fully qualified field name.

Parameters:

fqFieldName - the fully qualified name that is contained in the map from get()

Returns:

a selected field or null if there is no matching field