GraphQLInterfaceType.java

package graphql.schema;

import graphql.AssertException;
import graphql.Internal;
import graphql.PublicApi;
import graphql.language.InterfaceTypeDefinition;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.UnaryOperator;

import static graphql.Assert.assertNotNull;
import static graphql.Assert.assertValidName;

@PublicApi
public class GraphQLInterfaceType implements GraphQLType, GraphQLOutputType, GraphQLFieldsContainer, GraphQLCompositeType, GraphQLUnmodifiedType, GraphQLNullableType {

    private final String name;
    private final String description;
    private final Map<String, GraphQLFieldDefinition> fieldDefinitionsByName = new LinkedHashMap<>();
    private final TypeResolver typeResolver;
    private final InterfaceTypeDefinition definition;

    @Internal
    public GraphQLInterfaceType(String name, String description, List<GraphQLFieldDefinition> fieldDefinitions, TypeResolver typeResolver) {
        this(name, description, fieldDefinitions, typeResolver, null);
    }

    @Internal
    public GraphQLInterfaceType(String name, String description, List<GraphQLFieldDefinition> fieldDefinitions, TypeResolver typeResolver, InterfaceTypeDefinition definition) {
        assertValidName(name);
        assertNotNull(typeResolver, "typeResolver can't null");
        assertNotNull(fieldDefinitions, "fieldDefinitions can't null");
        this.name = name;
        this.description = description;
        buildDefinitionMap(fieldDefinitions);
        this.typeResolver = typeResolver;
        this.definition = definition;
    }

    private void buildDefinitionMap(List<GraphQLFieldDefinition> fieldDefinitions) {
        for (GraphQLFieldDefinition fieldDefinition : fieldDefinitions) {
            String name = fieldDefinition.getName();
            if (fieldDefinitionsByName.containsKey(name))
                throw new AssertException("field " + name + " redefined");
            fieldDefinitionsByName.put(name, fieldDefinition);
        }
    }

    public GraphQLFieldDefinition getFieldDefinition(String name) {
        return fieldDefinitionsByName.get(name);
    }


    public List<GraphQLFieldDefinition> getFieldDefinitions() {
        return new ArrayList<>(fieldDefinitionsByName.values());
    }

    public String getName() {
        return name;
    }

    public String getDescription() {
        return description;
    }

    public TypeResolver getTypeResolver() {
        return typeResolver;
    }

    public InterfaceTypeDefinition getDefinition() {
        return definition;
    }

    @Override
    public String toString() {
        return "GraphQLInterfaceType{" +
                "name='" + name + '\'' +
                ", description='" + description + '\'' +
                ", fieldDefinitionsByName=" + fieldDefinitionsByName +
                ", typeResolver=" + typeResolver +
                '}';
    }

    public static Builder newInterface() {
        return new Builder();
    }


    @PublicApi
    public static class Builder {
        private String name;
        private String description;
        private List<GraphQLFieldDefinition> fields = new ArrayList<>();
        private TypeResolver typeResolver;
        private InterfaceTypeDefinition definition;


        public Builder name(String name) {
            this.name = name;
            return this;
        }

        public Builder description(String description) {
            this.description = description;
            return this;
        }

        public Builder definition(InterfaceTypeDefinition definition) {
            this.definition = definition;
            return this;
        }

        public Builder field(GraphQLFieldDefinition fieldDefinition) {
            fields.add(fieldDefinition);
            return this;
        }

        /**
         * Take a field builder in a function definition and apply. Can be used in a jdk8 lambda
         * e.g.:
         * <pre>
         *     {@code
         *      field(f -> f.name("fieldName"))
         *     }
         * </pre>
         *
         * @param builderFunction a supplier for the builder impl
         * @return this
         */
        public Builder field(UnaryOperator<GraphQLFieldDefinition.Builder> builderFunction) {
            assertNotNull(builderFunction, "builderFunction can't be null");
            GraphQLFieldDefinition.Builder builder = GraphQLFieldDefinition.newFieldDefinition();
            builder = builderFunction.apply(builder);
            return field(builder);
        }

        /**
         * Same effect as the field(GraphQLFieldDefinition). Builder.build() is called
         * from within
         *
         * @param builder an un-built/incomplete GraphQLFieldDefinition
         * @return this
         */
        public Builder field(GraphQLFieldDefinition.Builder builder) {
            this.fields.add(builder.build());
            return this;
        }

        public Builder fields(List<GraphQLFieldDefinition> fieldDefinitions) {
            assertNotNull(fieldDefinitions, "fieldDefinitions can't be null");
            fields.addAll(fieldDefinitions);
            return this;
        }

        public Builder typeResolver(TypeResolver typeResolver) {
            this.typeResolver = typeResolver;
            return this;
        }

        public GraphQLInterfaceType build() {
            return new GraphQLInterfaceType(name, description, fields, typeResolver, definition);
        }
    }

}