Examples with FieldValidationInstrumentation graphql.execution.instrumentation.fieldvalidation.FieldValidationInstrumentation used on opensource projects

Example 1 with FieldValidationInstrumentation

use of graphql.execution.instrumentation.fieldvalidation.FieldValidationInstrumentation in project graphql-java by graphql-java.

the class InstrumentationExamples method fieldValidation.

private void fieldValidation() {
    ExecutionPath fieldPath = ExecutionPath.parse("/user");
    FieldValidation fieldValidation = new SimpleFieldValidation().addRule(fieldPath, new BiFunction<FieldAndArguments, FieldValidationEnvironment, Optional<GraphQLError>>() {

        @Override
        public Optional<GraphQLError> apply(FieldAndArguments fieldAndArguments, FieldValidationEnvironment environment) {
            String nameArg = fieldAndArguments.getArgumentValue("name");
            if (nameArg.length() > 255) {
                return Optional.of(environment.mkError("Invalid user name", fieldAndArguments));
            }
            return Optional.empty();
        }
    });
    FieldValidationInstrumentation instrumentation = new FieldValidationInstrumentation(fieldValidation);
    GraphQL.newGraphQL(schema).instrumentation(instrumentation).build();
}