io.leangen.graphql.metadata

Class Resolver

java.lang.Object

io.leangen.graphql.metadata.Resolver

public class Resolver
extends Object

Class representing a single method used to resolve a specific query given specific arguments. A single query can have multiple resolvers, corresponding to different combinations of arguments. This is done mainly to support attaching multiple overloaded methods as resolvers for the same query. Two resolvers of the same query must not accept the same list of argument names.

Author:

bojan.tomic (kaqqao)

Constructor Summary

Constructors

Constructor and Description
Resolver(String operationName, String operationDescription, boolean batched, Executable executable, List<OperationArgument> arguments, String complexityExpression)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object that)
List<OperationArgument>	getArguments()
String	getComplexityExpression()
Set<String>	getFingerprints() Get the fingerprint of this resolver.
String	getOperationDescription()
String	getOperationName()
AnnotatedType	getReturnType()
Set<Type>	getSourceTypes() Gets the generic Java types of the source objects (object returned by the parent query), if one is accepted by this resolver.
int	hashCode()
boolean	isBatched()
Object	resolve(Object source, Object[] args) Calls the underlying resolver method/field
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Resolver

public Resolver(String operationName,
                String operationDescription,
                boolean batched,
                Executable executable,
                List<OperationArgument> arguments,
                String complexityExpression)

Method Detail

resolve

public Object resolve(Object source,
                      Object[] args)
               throws InvocationTargetException,
                      IllegalAccessException

Calls the underlying resolver method/field

Parameters:

source - The object on which the method/field is to be called

args - Arguments to the underlying method (empty if the underlying resolver is a field)

Returns:

The result returned by the underlying method/field

Throws:

InvocationTargetException - If a reflective invocation of the underlying method/field fails

IllegalAccessException - If a reflective invocation of the underlying method/field is not allowed

getSourceTypes

public Set<Type> getSourceTypes()

Gets the generic Java types of the source objects (object returned by the parent query), if one is accepted by this resolver. Used to decide if this query can be nested inside another.

Returns:

The generic Java type of the source object, or null if this resolver does not accept one.

getOperationName

public String getOperationName()

isBatched

public boolean isBatched()

getOperationDescription

public String getOperationDescription()

getFingerprints

public Set<String> getFingerprints()

Get the fingerprint of this resolver. Fingerprint uniquely identifies a resolver within a query. It is based on the name of the query and all parameters this specific resolver accepts. It is used to decide which resolver to invoke for the query, based on the provided arguments.

Returns:

The unique "fingerprint" string identifying this resolver

getArguments

public List<OperationArgument> getArguments()

getReturnType

public AnnotatedType getReturnType()

getComplexityExpression

public String getComplexityExpression()

equals

public boolean equals(Object that)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object