graphql.schema.GraphQLUnionType Maven / Gradle / Ivy
package graphql.schema;
import com.google.common.collect.ImmutableList;
import graphql.Assert;
import graphql.DirectivesUtil;
import graphql.Internal;
import graphql.PublicApi;
import graphql.language.UnionTypeDefinition;
import graphql.language.UnionTypeExtensionDefinition;
import graphql.util.TraversalControl;
import graphql.util.TraverserContext;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import static graphql.Assert.assertNotEmpty;
import static graphql.Assert.assertNotNull;
import static graphql.Assert.assertValidName;
import static graphql.collect.ImmutableKit.emptyList;
import static graphql.schema.SchemaElementChildrenContainer.newSchemaElementChildrenContainer;
import static graphql.util.FpKit.getByName;
/**
* A union type is a polymorphic type that dynamically represents one of more concrete object types.
*
* At runtime a {@link TypeResolver} is used to take an union object value and decide what {@link GraphQLObjectType}
* represents this union of types.
*
* Note that members of a union type need to be concrete object types; you can't create a union type out of interfaces or other unions.
*
* See https://graphql.org/learn/schema/#union-types for more details on the concept.
*/
@PublicApi
public class GraphQLUnionType implements GraphQLNamedOutputType, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType, GraphQLDirectiveContainer {
private final String name;
private final String description;
private final ImmutableList originalTypes;
private final TypeResolver typeResolver;
private final UnionTypeDefinition definition;
private final ImmutableList extensionDefinitions;
private final DirectivesUtil.DirectivesHolder directives;
private ImmutableList replacedTypes;
public static final String CHILD_TYPES = "types";
@Internal
private GraphQLUnionType(String name,
String description,
List types,
TypeResolver typeResolver,
List directives,
List appliedDirectives,
UnionTypeDefinition definition,
List extensionDefinitions) {
assertValidName(name);
assertNotNull(types, () -> "types can't be null");
assertNotEmpty(types, () -> "A Union type must define one or more member types.");
assertNotNull(directives, () -> "directives cannot be null");
this.name = name;
this.description = description;
this.originalTypes = ImmutableList.copyOf(types);
this.typeResolver = typeResolver;
this.definition = definition;
this.extensionDefinitions = ImmutableList.copyOf(extensionDefinitions);
this.directives = DirectivesUtil.DirectivesHolder.create(directives, appliedDirectives);
}
void replaceTypes(List types) {
this.replacedTypes = ImmutableList.copyOf(types);
}
/**
* @return This returns GraphQLObjectType or GraphQLTypeReference instances, if the type
* references are not resolved yet. After they are resolved it contains only GraphQLObjectType.
* Reference resolving happens when a full schema is built.
*/
public List getTypes() {
if (replacedTypes != null) {
return replacedTypes;
}
return originalTypes;
}
/**
* Returns true of the object type is a member of this Union type.
*
* @param graphQLObjectType the type to check
*
* @return true if the object type is a member of this union type.
*/
public boolean isPossibleType(GraphQLObjectType graphQLObjectType) {
return getTypes().stream().anyMatch(nt -> nt.getName().equals(graphQLObjectType.getName()));
}
// to be removed in a future version when all code is in the code registry
@Internal
@Deprecated(since = "2018-12-03")
TypeResolver getTypeResolver() {
return typeResolver;
}
@Override
public String getName() {
return name;
}
public String getDescription() {
return description;
}
public UnionTypeDefinition getDefinition() {
return definition;
}
public List getExtensionDefinitions() {
return extensionDefinitions;
}
@Override
public List getDirectives() {
return directives.getDirectives();
}
@Override
public Map getDirectivesByName() {
return directives.getDirectivesByName();
}
@Override
public Map> getAllDirectivesByName() {
return directives.getAllDirectivesByName();
}
@Override
public GraphQLDirective getDirective(String directiveName) {
return directives.getDirective(directiveName);
}
@Override
public List getAppliedDirectives() {
return directives.getAppliedDirectives();
}
@Override
public Map> getAllAppliedDirectivesByName() {
return directives.getAllAppliedDirectivesByName();
}
@Override
public GraphQLAppliedDirective getAppliedDirective(String directiveName) {
return directives.getAppliedDirective(directiveName);
}
/**
* This helps you transform the current GraphQLUnionType into another one by starting a builder with all
* the current values and allows you to transform it how you want.
*
* @param builderConsumer the consumer code that will be given a builder to transform
*
* @return a new object based on calling build on that builder
*/
public GraphQLUnionType transform(Consumer builderConsumer) {
Builder builder = newUnionType(this);
builderConsumer.accept(builder);
return builder.build();
}
@Override
public GraphQLSchemaElement copy() {
return newUnionType(this).build();
}
@Override
public TraversalControl accept(TraverserContext context, GraphQLTypeVisitor visitor) {
return visitor.visitGraphQLUnionType(this, context);
}
@Override
public List getChildren() {
List children = new ArrayList<>(getTypes());
children.addAll(directives.getDirectives());
children.addAll(directives.getAppliedDirectives());
return children;
}
@Override
public SchemaElementChildrenContainer getChildrenWithTypeReferences() {
return newSchemaElementChildrenContainer()
.children(CHILD_TYPES, originalTypes)
.children(CHILD_DIRECTIVES, directives.getDirectives())
.children(CHILD_APPLIED_DIRECTIVES, directives.getAppliedDirectives())
.build();
}
@Override
public GraphQLUnionType withNewChildren(SchemaElementChildrenContainer newChildren) {
return transform(builder ->
builder.replacePossibleTypes(newChildren.getChildren(CHILD_TYPES))
.replaceDirectives(newChildren.getChildren(CHILD_DIRECTIVES))
.replaceAppliedDirectives(newChildren.getChildren(CHILD_APPLIED_DIRECTIVES))
);
}
/**
* {@inheritDoc}
*/
@Override
public final boolean equals(Object o) {
return super.equals(o);
}
/**
* {@inheritDoc}
*/
@Override
public final int hashCode() {
return super.hashCode();
}
@Override
public String toString() {
return "GraphQLUnionType{" +
"name='" + name + '\'' +
", description='" + description + '\'' +
", definition=" + definition +
'}';
}
public static Builder newUnionType() {
return new Builder();
}
public static Builder newUnionType(GraphQLUnionType existing) {
return new Builder(existing);
}
@PublicApi
public static class Builder extends GraphqlDirectivesContainerTypeBuilder {
private TypeResolver typeResolver;
private UnionTypeDefinition definition;
private List extensionDefinitions = emptyList();
private final Map types = new LinkedHashMap<>();
public Builder() {
}
public Builder(GraphQLUnionType existing) {
this.name = existing.getName();
this.description = existing.getDescription();
this.typeResolver = existing.getTypeResolver();
this.definition = existing.getDefinition();
this.extensionDefinitions = existing.getExtensionDefinitions();
this.types.putAll(getByName(existing.originalTypes, GraphQLNamedType::getName));
copyExistingDirectives(existing);
}
public Builder definition(UnionTypeDefinition definition) {
this.definition = definition;
return this;
}
public Builder extensionDefinitions(List extensionDefinitions) {
this.extensionDefinitions = extensionDefinitions;
return this;
}
/**
* @param typeResolver the type resolver
*
* @return this builder
*
* @deprecated use {@link graphql.schema.GraphQLCodeRegistry.Builder#typeResolver(GraphQLUnionType, TypeResolver)} instead
*/
@Deprecated(since = "2018-12-03")
public Builder typeResolver(TypeResolver typeResolver) {
this.typeResolver = typeResolver;
return this;
}
public Builder possibleType(GraphQLObjectType type) {
assertNotNull(type, () -> "possible type can't be null");
types.put(type.getName(), type);
return this;
}
public Builder possibleType(GraphQLTypeReference reference) {
assertNotNull(reference, () -> "reference can't be null");
types.put(reference.getName(), reference);
return this;
}
public Builder possibleTypes(GraphQLObjectType... type) {
for (GraphQLObjectType graphQLType : type) {
possibleType(graphQLType);
}
return this;
}
public Builder replacePossibleTypes(List types) {
this.types.clear();
for (GraphQLSchemaElement schemaElement : types) {
if (schemaElement instanceof GraphQLTypeReference) {
possibleType((GraphQLTypeReference) schemaElement);
} else if (schemaElement instanceof GraphQLObjectType) {
possibleType((GraphQLObjectType) schemaElement);
} else {
Assert.assertShouldNeverHappen("Unexpected type " + (schemaElement != null ? schemaElement.getClass() : "null"));
}
}
return this;
}
public Builder possibleTypes(GraphQLTypeReference... references) {
for (GraphQLTypeReference reference : references) {
possibleType(reference);
}
return this;
}
/**
* This is used to clear all the types in the builder so far.
*
* @return the builder
*/
public Builder clearPossibleTypes() {
types.clear();
return this;
}
public boolean containType(String name) {
return types.containsKey(name);
}
// -- the following are repeated to avoid a binary incompatibility problem --
@Override
public Builder replaceDirectives(List directives) {
return super.replaceDirectives(directives);
}
@Override
public Builder withDirectives(GraphQLDirective... directives) {
return super.withDirectives(directives);
}
@Override
public Builder withDirective(GraphQLDirective directive) {
return super.withDirective(directive);
}
@Override
public Builder withDirective(GraphQLDirective.Builder builder) {
return super.withDirective(builder);
}
@Override
public Builder clearDirectives() {
return super.clearDirectives();
}
@Override
public Builder name(String name) {
return super.name(name);
}
@Override
public Builder description(String description) {
return super.description(description);
}
public GraphQLUnionType build() {
return new GraphQLUnionType(
name,
description,
sort(types, GraphQLUnionType.class, GraphQLOutputType.class),
typeResolver,
sort(directives, GraphQLUnionType.class, GraphQLDirective.class),
sort(appliedDirectives, GraphQLUnionType.class, GraphQLAppliedDirective.class),
definition,
extensionDefinitions);
}
}
}