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package graphql.schema;
import graphql.Assert;
import graphql.PublicApi;
import graphql.introspection.Introspection;
import graphql.schema.idl.DirectiveInfo;
import graphql.schema.idl.ScalarInfo;
import java.util.Stack;
import java.util.function.Predicate;
import static graphql.Assert.assertNotNull;
import static graphql.Assert.assertShouldNeverHappen;
/**
* A utility class that helps work with {@link graphql.schema.GraphQLType}s
*/
@PublicApi
public class GraphQLTypeUtil {
/**
* This will return the type in graphql SDL format, eg [typeName!]!
*
* @param type the type in play
*
* @return the type in graphql SDL format, eg [typeName!]!
*/
public static String simplePrint(GraphQLType type) {
Assert.assertNotNull(type, () -> "type can't be null");
StringBuilder sb = new StringBuilder();
if (isNonNull(type)) {
sb.append(simplePrint(unwrapOne(type)));
sb.append("!");
} else if (isList(type)) {
sb.append("[");
sb.append(simplePrint(unwrapOne(type)));
sb.append("]");
} else {
sb.append(((GraphQLNamedType) type).getName());
}
return sb.toString();
}
public static String simplePrint(GraphQLSchemaElement schemaElement) {
if (schemaElement instanceof GraphQLType) {
return simplePrint((GraphQLType) schemaElement);
}
if (schemaElement instanceof GraphQLNamedSchemaElement) {
return ((GraphQLNamedSchemaElement) schemaElement).getName();
}
// a schema element is either a GraphQLType or a GraphQLNamedSchemaElement
return assertShouldNeverHappen("unexpected schema element: " + schemaElement);
}
/**
* Returns true if the given type is a non null type
*
* @param type the type to check
*
* @return true if the given type is a non null type
*/
public static boolean isNonNull(GraphQLType type) {
return type instanceof GraphQLNonNull;
}
/**
* Returns true if the given type is a nullable type
*
* @param type the type to check
*
* @return true if the given type is a nullable type
*/
public static boolean isNullable(GraphQLType type) {
return !isNonNull(type);
}
/**
* Returns true if the given type is a list type
*
* @param type the type to check
*
* @return true if the given type is a list type
*/
public static boolean isList(GraphQLType type) {
return type instanceof GraphQLList;
}
/**
* Returns true if the given type is a non null or list type, that is a wrapped type
*
* @param type the type to check
*
* @return true if the given type is a non null or list type
*/
public static boolean isWrapped(GraphQLType type) {
return isList(type) || isNonNull(type);
}
/**
* Returns true if the given type is NOT a non null or list type
*
* @param type the type to check
*
* @return true if the given type is NOT a non null or list type
*/
public static boolean isNotWrapped(GraphQLType type) {
return !isWrapped(type);
}
/**
* Returns true if the given type is a scalar type
*
* @param type the type to check
*
* @return true if the given type is a scalar type
*/
public static boolean isScalar(GraphQLType type) {
return type instanceof GraphQLScalarType;
}
/**
* Returns true if the given type is an enum type
*
* @param type the type to check
*
* @return true if the given type is an enum type
*/
public static boolean isEnum(GraphQLType type) {
return type instanceof GraphQLEnumType;
}
/**
* Returns true if the given type is a leaf type, that it cant contain any more fields
*
* @param type the type to check
*
* @return true if the given type is a leaf type
*/
public static boolean isLeaf(GraphQLType type) {
GraphQLUnmodifiedType unmodifiedType = unwrapAll(type);
return
unmodifiedType instanceof GraphQLScalarType
|| unmodifiedType instanceof GraphQLEnumType;
}
/**
* Returns true if the given type is an input type
*
* @param type the type to check
*
* @return true if the given type is an input type
*/
public static boolean isInput(GraphQLType type) {
GraphQLUnmodifiedType unmodifiedType = unwrapAll(type);
return
unmodifiedType instanceof GraphQLScalarType
|| unmodifiedType instanceof GraphQLEnumType
|| unmodifiedType instanceof GraphQLInputObjectType;
}
/**
* Unwraps one layer of the type or just returns the type again if it's not a wrapped type
*
* @param type the type to unwrapOne
*
* @return the unwrapped type or the same type again if it's not wrapped
*/
public static GraphQLType unwrapOne(GraphQLType type) {
if (isNonNull(type)) {
return ((GraphQLNonNull) type).getWrappedType();
} else if (isList(type)) {
return ((GraphQLList) type).getWrappedType();
}
return type;
}
/**
* Unwraps one layer of the type or just returns the type again if it's not a wrapped type
* and then cast to the target type.
*
* @param type the type to unwrapOne
* @param <T> for two
*
* @return the unwrapped type or the same type again if it's not wrapped
*/
public static <T extends GraphQLType> T unwrapOneAs(GraphQLType type) {
//noinspection unchecked
return (T) unwrapOne(type);
}
/**
* Unwraps all layers of the type or just returns the type again if it's not a wrapped type
*
* @param type the type to unwrapOne
*
* @return the underlying type
*/
public static GraphQLUnmodifiedType unwrapAll(GraphQLType type) {
while (true) {
if (isNotWrapped(type)) {
return (GraphQLUnmodifiedType) type;
}
type = unwrapOne(type);
}
}
/**
* Unwraps all layers of the type or just returns the type again if it's not a wrapped type
* and then cast to the target type.
*
* @param type the type to unwrapOne
* @param <T> for two
*
* @return the underlying type
*/
public static <T extends GraphQLType> T unwrapAllAs(GraphQLType type) {
//noinspection unchecked
return (T) unwrapAll(type);
}
/**
* Unwraps all non nullable layers of the type until it reaches a type that is not {@link GraphQLNonNull}
*
* @param type the type to unwrap
*
* @return the underlying type that is not {@link GraphQLNonNull}
*/
public static GraphQLType unwrapNonNull(GraphQLType type) {
while (isNonNull(type)) {
type = unwrapOne(type);
}
return type;
}
/**
* Unwraps all non nullable layers of the type until it reaches a type that is not {@link GraphQLNonNull}
* and then cast to the target type.
*
* @param type the type to unwrap
* @param <T> for two
*
* @return the underlying type that is not {@link GraphQLNonNull}
*/
public static <T extends GraphQLType> T unwrapNonNullAs(GraphQLType type) {
//noinspection unchecked
return (T) unwrapNonNull(type);
}
/**
* graphql types can be wrapped in {@link GraphQLNonNull} and {@link GraphQLList} type wrappers
* so this method will unwrap the type down to the raw unwrapped type and return that wrapping
* as a stack, with the top of the stack being the raw underling type.
*
* @param type the type to unwrap
*
* @return a stack of the type wrapping which will be at least 1 later deep
*/
public static Stack<GraphQLType> unwrapType(GraphQLType type) {
assertNotNull(type);
Stack<GraphQLType> decoration = new Stack<>();
while (true) {
decoration.push(type);
if (isNotWrapped(type)) {
break;
}
type = unwrapOne(type);
}
return decoration;
}
public static boolean isInterfaceOrUnion(GraphQLType type) {
return type instanceof GraphQLInterfaceType || type instanceof GraphQLUnionType;
}
public static boolean isObjectType(GraphQLType type) {
return type instanceof GraphQLObjectType;
}
/**
* This predicate returns true if the schema element is an inbuilt schema element
* such as the system scalars and directives or introspection types
*
* @return true if it's a system schema element
*/
public static Predicate<GraphQLNamedSchemaElement> isSystemElement() {
return schemaElement -> {
if (schemaElement instanceof GraphQLScalarType) {
return ScalarInfo.isGraphqlSpecifiedScalar((GraphQLScalarType) schemaElement);
}
if (schemaElement instanceof GraphQLDirective) {
return DirectiveInfo.isGraphqlSpecifiedDirective((GraphQLDirective) schemaElement);
}
if (schemaElement instanceof GraphQLNamedType) {
return Introspection.isIntrospectionTypes((GraphQLNamedType) schemaElement);
}
return false;
};
}
}
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