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177 lines (143 loc) · 8.26 KB
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package graphql.analysis;
import graphql.Internal;
import graphql.execution.ConditionalNodes;
import graphql.execution.ValuesResolver;
import graphql.introspection.Introspection;
import graphql.language.Field;
import graphql.language.FragmentDefinition;
import graphql.language.FragmentSpread;
import graphql.language.InlineFragment;
import graphql.language.Node;
import graphql.language.NodeTraverser;
import graphql.language.NodeVisitorStub;
import graphql.language.TypeName;
import graphql.schema.GraphQLCodeRegistry;
import graphql.schema.GraphQLCompositeType;
import graphql.schema.GraphQLFieldDefinition;
import graphql.schema.GraphQLFieldsContainer;
import graphql.schema.GraphQLSchema;
import graphql.schema.GraphQLUnmodifiedType;
import graphql.util.TraversalControl;
import graphql.util.TraverserContext;
import java.util.Map;
import static graphql.Assert.assertNotNull;
import static graphql.language.NodeTraverser.LeaveOrEnter.LEAVE;
import static graphql.schema.GraphQLTypeUtil.unwrapAll;
/**
* Internally used node visitor which delegates to a {@link QueryVisitor} with type
* information about the visited field.
*/
@Internal
public class NodeVisitorWithTypeTracking extends NodeVisitorStub {
private final QueryVisitor preOrderCallback;
private final QueryVisitor postOrderCallback;
private final Map<String, Object> variables;
private final GraphQLSchema schema;
private final Map<String, FragmentDefinition> fragmentsByName;
private final ConditionalNodes conditionalNodes = new ConditionalNodes();
private final ValuesResolver valuesResolver = new ValuesResolver();
public NodeVisitorWithTypeTracking(QueryVisitor preOrderCallback, QueryVisitor postOrderCallback, Map<String, Object> variables, GraphQLSchema schema, Map<String, FragmentDefinition> fragmentsByName) {
this.preOrderCallback = preOrderCallback;
this.postOrderCallback = postOrderCallback;
this.variables = variables;
this.schema = schema;
this.fragmentsByName = fragmentsByName;
}
@Override
public TraversalControl visitInlineFragment(InlineFragment inlineFragment, TraverserContext<Node> context) {
if (!conditionalNodes.shouldInclude(variables, inlineFragment.getDirectives())) {
return TraversalControl.ABORT;
}
QueryVisitorInlineFragmentEnvironment inlineFragmentEnvironment = new QueryVisitorInlineFragmentEnvironmentImpl(inlineFragment, context);
if (context.getVar(NodeTraverser.LeaveOrEnter.class) == LEAVE) {
postOrderCallback.visitInlineFragment(inlineFragmentEnvironment);
return TraversalControl.CONTINUE;
}
preOrderCallback.visitInlineFragment(inlineFragmentEnvironment);
// inline fragments are allowed not have type conditions, if so the parent type counts
QueryTraversalContext parentEnv = context.getVarFromParents(QueryTraversalContext.class);
GraphQLCompositeType fragmentCondition;
if (inlineFragment.getTypeCondition() != null) {
TypeName typeCondition = inlineFragment.getTypeCondition();
fragmentCondition = (GraphQLCompositeType) schema.getType(typeCondition.getName());
} else {
fragmentCondition = parentEnv.getRawType();
}
// for unions we only have other fragments inside
context.setVar(QueryTraversalContext.class, new QueryTraversalContext(fragmentCondition, fragmentCondition, parentEnv.getEnvironment(), inlineFragment));
return TraversalControl.CONTINUE;
}
@Override
public TraversalControl visitFragmentDefinition(FragmentDefinition node, TraverserContext<Node> context) {
if (!conditionalNodes.shouldInclude(variables, node.getDirectives())) {
return TraversalControl.ABORT;
}
QueryVisitorFragmentDefinitionEnvironment fragmentEnvironment = new QueryVisitorFragmentDefinitionEnvironmentImpl(node, context);
if (context.getVar(NodeTraverser.LeaveOrEnter.class) == LEAVE) {
postOrderCallback.visitFragmentDefinition(fragmentEnvironment);
return TraversalControl.CONTINUE;
}
preOrderCallback.visitFragmentDefinition(fragmentEnvironment);
QueryTraversalContext parentEnv = context.getVarFromParents(QueryTraversalContext.class);
GraphQLCompositeType typeCondition = (GraphQLCompositeType) schema.getType(node.getTypeCondition().getName());
context
.setVar(QueryTraversalContext.class, new QueryTraversalContext(typeCondition, typeCondition, parentEnv.getEnvironment(), node));
return TraversalControl.CONTINUE;
}
@Override
public TraversalControl visitFragmentSpread(FragmentSpread fragmentSpread, TraverserContext<Node> context) {
if (!conditionalNodes.shouldInclude(variables, fragmentSpread.getDirectives())) {
return TraversalControl.ABORT;
}
FragmentDefinition fragmentDefinition = fragmentsByName.get(fragmentSpread.getName());
if (!conditionalNodes.shouldInclude(variables, fragmentDefinition.getDirectives())) {
return TraversalControl.ABORT;
}
QueryVisitorFragmentSpreadEnvironment fragmentSpreadEnvironment = new QueryVisitorFragmentSpreadEnvironmentImpl(fragmentSpread, fragmentDefinition, context);
if (context.getVar(NodeTraverser.LeaveOrEnter.class) == LEAVE) {
postOrderCallback.visitFragmentSpread(fragmentSpreadEnvironment);
return TraversalControl.CONTINUE;
}
preOrderCallback.visitFragmentSpread(fragmentSpreadEnvironment);
QueryTraversalContext parentEnv = context.getVarFromParents(QueryTraversalContext.class);
GraphQLCompositeType typeCondition = (GraphQLCompositeType) schema.getType(fragmentDefinition.getTypeCondition().getName());
assertNotNull(typeCondition, "Invalid type condition '%s' in fragment '%s'", fragmentDefinition.getTypeCondition().getName(),
fragmentDefinition.getName());
context
.setVar(QueryTraversalContext.class, new QueryTraversalContext(typeCondition, typeCondition, parentEnv.getEnvironment(), fragmentDefinition));
return TraversalControl.CONTINUE;
}
@Override
public TraversalControl visitField(Field field, TraverserContext<Node> context) {
QueryTraversalContext parentEnv = context.getVarFromParents(QueryTraversalContext.class);
GraphQLFieldDefinition fieldDefinition = Introspection.getFieldDef(schema, parentEnv.getRawType(), field.getName());
boolean isTypeNameIntrospectionField = fieldDefinition == Introspection.TypeNameMetaFieldDef;
GraphQLFieldsContainer fieldsContainer = !isTypeNameIntrospectionField ? (GraphQLFieldsContainer) unwrapAll(parentEnv.getOutputType()) : null;
GraphQLCodeRegistry codeRegistry = schema.getCodeRegistry();
Map<String, Object> argumentValues = valuesResolver.getArgumentValues(codeRegistry, fieldDefinition.getArguments(), field.getArguments(), variables);
QueryVisitorFieldEnvironment environment = new QueryVisitorFieldEnvironmentImpl(isTypeNameIntrospectionField,
field,
fieldDefinition,
parentEnv.getOutputType(),
fieldsContainer,
parentEnv.getEnvironment(),
argumentValues,
parentEnv.getSelectionSetContainer(),
context);
NodeTraverser.LeaveOrEnter leaveOrEnter = context.getVar(NodeTraverser.LeaveOrEnter.class);
if (leaveOrEnter == LEAVE) {
postOrderCallback.visitField(environment);
return TraversalControl.CONTINUE;
}
if (!conditionalNodes.shouldInclude(variables, field.getDirectives())) {
return TraversalControl.ABORT;
}
preOrderCallback.visitField(environment);
GraphQLUnmodifiedType unmodifiedType = unwrapAll(fieldDefinition.getType());
QueryTraversalContext fieldEnv = (unmodifiedType instanceof GraphQLCompositeType)
? new QueryTraversalContext(fieldDefinition.getType(), (GraphQLCompositeType) unmodifiedType, environment, field)
: new QueryTraversalContext(null, null, environment, field);// Terminal (scalar) node, EMPTY FRAME
context.setVar(QueryTraversalContext.class, fieldEnv);
return TraversalControl.CONTINUE;
}
}