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package graphql.schema;

import graphql.PublicApi;

import graphql.util.TraversalControl;

import graphql.util.TraverserContext;

import java.util.Collections;

import java.util.List;

import java.util.Objects;

import static graphql.Assert.assertNotNull;

/**

* A modified type that indicates there is a list of the underlying wrapped type, eg a list of strings or a list of booleans.

*

* See http://graphql.org/learn/schema/#lists-and-non-null for more details on the concept

*/

@PublicApi

public class GraphQLList implements GraphQLType, GraphQLInputType, GraphQLOutputType, GraphQLModifiedType, GraphQLNullableType {

private final GraphQLType originalWrappedType;

private GraphQLType replacedWrappedType;

public static final String CHILD_WRAPPED_TYPE = "wrappedType";

/**

* A factory method for creating list types so that when used with static imports allows

* more readable code such as

* {@code .type(list(GraphQLString)) }

*

* @param wrappedType the type to wrap as being a list

*

* @return a GraphQLList of that wrapped type

*/

public static GraphQLList list(GraphQLType wrappedType) {

return new GraphQLList(wrappedType);

}

public GraphQLList(GraphQLType wrappedType) {

assertNotNull(wrappedType, () -> "wrappedType can't be null");

this.originalWrappedType = wrappedType;

}

@Override

public GraphQLType getWrappedType() {

return replacedWrappedType != null ? replacedWrappedType : originalWrappedType;

}

public GraphQLType getOriginalWrappedType() {

return originalWrappedType;

}

void replaceType(GraphQLType type) {

this.replacedWrappedType = type;

}

public boolean isEqualTo(Object o) {

if (this == o) {

return true;

}

if (o == null || getClass() != o.getClass()) {

return false;

}

GraphQLList that = (GraphQLList) o;

GraphQLType wrappedType = getWrappedType();

if (wrappedType instanceof GraphQLNonNull) {

return ((GraphQLNonNull) wrappedType).isEqualTo(that.getWrappedType());

}

return Objects.equals(wrappedType, that.getWrappedType());

}

@Override

public TraversalControl accept(TraverserContext<GraphQLSchemaElement> context, GraphQLTypeVisitor visitor) {

return visitor.visitGraphQLList(this, context);

}

@Override

public List<GraphQLSchemaElement> getChildren() {

return Collections.singletonList(getWrappedType());

}

@Override

public SchemaElementChildrenContainer getChildrenWithTypeReferences() {

return SchemaElementChildrenContainer.newSchemaElementChildrenContainer()

.child(CHILD_WRAPPED_TYPE, originalWrappedType)

.build();

}

@Override

public GraphQLSchemaElement withNewChildren(SchemaElementChildrenContainer newChildren) {

return list(newChildren.getChildOrNull(CHILD_WRAPPED_TYPE));

}

@Override

public String toString() {

return GraphQLTypeUtil.simplePrint(this);

}

/**

* {@inheritDoc}

*/

@Override

public final boolean equals(Object o) {

return super.equals(o);

}

/**

* {@inheritDoc}

*/

@Override

public final int hashCode() {

return super.hashCode();

}

}