private void writePossiblePropertyValues(
JsonGenerator jgen,
String currentVocab,
ActionInputParameter actionInputParameter,
@SuppressWarnings("unused") Object[] possiblePropertyValues)
throws IOException {
// Enable the following to list possible values.
// Problem: how to express individuals only for certain hydra:options
// not all hydra:options should be taken as uris, sometimes they might be just literals
// how to make that clear to the client?
// maybe we must write them out for options
// if (possiblePropertyValues.length > 0) {
// jgen.writeArrayFieldStart("hydra:option");
//
// for (Object possibleValue : possiblePropertyValues) {
// // TODO: apply "hydra:option" : { "@type": "@vocab"} to context for enums
// writeScalarValue(jgen, possibleValue,
// actionInputParameter.getParameterType());
// }
// jgen.writeEndArray();
// }
if (actionInputParameter.isArrayOrCollection()) {
jgen.writeBooleanField(
getPropertyOrClassNameInVocab(
currentVocab, "multipleValues", LdContextFactory.HTTP_SCHEMA_ORG, "schema:"),
true);
}
// valueRequired (hard to say, using @Access on Event is for all update requests - or make
// specific request beans for different
// purposes rather than always passing an instance of e.g. Event?)
// -> update is a different use case than create - or maybe have an
// @Requires("eventStatus")
// annotation alongside requestBody to tell which attributes are required or writable,
// and use Requires over
// bean structure, where ctor with least length of args is required and setters are
// supported
// but optional? The bean structure does say what is writable for updates, but not what
// is required for creation. Right now setters are supportedProperties. For creation we would
// have to add constructor arguments as supportedProperties.
// (/) defaultValue (pre-filled value, e.g. list of selected items for option)
// valueName (for iri templates only)
// (/) readonlyValue (true for final public field or absence of setter, send fixed value like
// hidden field?) -> use hydra:readable, hydra:writable
// (/) multipleValues
// (/) valueMinLength
// (/) valueMaxLength
// (/) valuePattern
// minValue (DateTime support)
// maxValue (DateTime support)
// (/) stepValue
final Map<String, Object> inputConstraints = actionInputParameter.getInputConstraints();
if (actionInputParameter.hasCallValue()) {
if (actionInputParameter.isArrayOrCollection()) {
Object[] callValues = actionInputParameter.getCallValues();
Class<?> componentType = callValues.getClass().getComponentType();
// only write defaultValue for array of scalars
if (DataType.isSingleValueType(componentType)) {
jgen.writeFieldName(
getPropertyOrClassNameInVocab(
currentVocab, "defaultValue", LdContextFactory.HTTP_SCHEMA_ORG, "schema:"));
jgen.writeStartArray();
for (Object callValue : callValues) {
writeScalarValue(jgen, callValue, componentType);
}
jgen.writeEndArray();
}
} else {
jgen.writeFieldName(
getPropertyOrClassNameInVocab(
currentVocab, "defaultValue", LdContextFactory.HTTP_SCHEMA_ORG, "schema:"));
writeScalarValue(
jgen, actionInputParameter.getCallValue(), actionInputParameter.getParameterType());
}
}
if (!inputConstraints.isEmpty()) {
final List<String> keysToAppendValue = Arrays.asList(Input.MAX, Input.MIN, Input.STEP);
for (String keyToAppendValue : keysToAppendValue) {
final Object constraint = inputConstraints.get(keyToAppendValue);
if (constraint != null) {
jgen.writeFieldName(
getPropertyOrClassNameInVocab(
currentVocab,
keyToAppendValue + "Value",
LdContextFactory.HTTP_SCHEMA_ORG,
"schema:"));
jgen.writeNumber(constraint.toString());
}
}
final List<String> keysToPrependValue =
Arrays.asList(Input.MAX_LENGTH, Input.MIN_LENGTH, Input.PATTERN);
for (String keyToPrependValue : keysToPrependValue) {
final Object constraint = inputConstraints.get(keyToPrependValue);
if (constraint != null) {
jgen.writeFieldName(
getPropertyOrClassNameInVocab(
currentVocab,
"value" + StringUtils.capitalize(keyToPrependValue),
LdContextFactory.HTTP_SCHEMA_ORG,
"schema:"));
if (Input.PATTERN.equals(keyToPrependValue)) {
jgen.writeString(constraint.toString());
} else {
jgen.writeNumber(constraint.toString());
}
}
}
}
}
private void recurseSupportedProperties(
JsonGenerator jgen,
String currentVocab,
Class<?> beanType,
ActionDescriptor actionDescriptor,
ActionInputParameter actionInputParameter,
Object currentCallValue)
throws IntrospectionException, IOException {
// TODO support Option provider by other method args?
final BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
final PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
// TODO collection and map
for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
final Method writeMethod = propertyDescriptor.getWriteMethod();
if (writeMethod == null) {
continue;
}
final Class<?> propertyType = propertyDescriptor.getPropertyType();
// TODO: the property name must be a valid URI - need to check context for terms?
String propertyName = getWritableExposedPropertyOrPropertyName(propertyDescriptor);
if (DataType.isSingleValueType(propertyType)) {
final Property property =
new Property(
beanType,
propertyDescriptor.getReadMethod(),
propertyDescriptor.getWriteMethod(),
propertyDescriptor.getName());
Object propertyValue = PropertyUtils.getPropertyValue(currentCallValue, propertyDescriptor);
MethodParameter methodParameter =
new MethodParameter(propertyDescriptor.getWriteMethod(), 0);
ActionInputParameter propertySetterInputParameter =
new ActionInputParameter(methodParameter, propertyValue);
final Object[] possiblePropertyValues =
actionInputParameter.getPossibleValues(
propertyDescriptor.getWriteMethod(), 0, actionDescriptor);
writeSupportedProperty(
jgen,
currentVocab,
propertySetterInputParameter,
propertyName,
property,
possiblePropertyValues);
} else {
jgen.writeStartObject();
jgen.writeStringField("hydra:property", propertyName);
// TODO: is the property required -> for bean props we need the Access annotation to express
// that
jgen.writeObjectFieldStart(
getPropertyOrClassNameInVocab(
currentVocab, "rangeIncludes", LdContextFactory.HTTP_SCHEMA_ORG, "schema:"));
Expose expose = AnnotationUtils.getAnnotation(propertyType, Expose.class);
String subClass;
if (expose != null) {
subClass = expose.value();
} else {
subClass = propertyType.getSimpleName();
}
jgen.writeStringField(
getPropertyOrClassNameInVocab(
currentVocab, "subClassOf", "http://www.w3.org/2000/01/rdf-schema#", "rdfs:"),
subClass);
jgen.writeArrayFieldStart("hydra:supportedProperty");
Object propertyValue = PropertyUtils.getPropertyValue(currentCallValue, propertyDescriptor);
recurseSupportedProperties(
jgen,
currentVocab,
propertyType,
actionDescriptor,
actionInputParameter,
propertyValue);
jgen.writeEndArray();
jgen.writeEndObject();
jgen.writeEndObject();
}
}
}