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package org.glassfish.admin.rest.composite.metadata;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import javax.json.Json;
import javax.json.JsonArrayBuilder;
import javax.json.JsonException;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.ws.rs.Consumes;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.container.Suspended;
import org.glassfish.admin.rest.OptionsCapable;
import org.glassfish.admin.rest.composite.RestCollection;
import org.glassfish.admin.rest.composite.RestModel;
import org.glassfish.admin.rest.utils.Util;
/**
* This class encapsulates the metadata for the specified REST resource method.
* @author jdlee
*/
public class RestMethodMetadata {
private String httpMethod;
private List queryParameters = new ArrayList();
/**
* The type of the incoming request body, if there is one.
*/
private Type requestPayload;
/**
* The type of the response entity. If isCollection is true, this value reflects the type of the items
* in the collection.
*/
private Type returnPayload;
/**
* Specifies whether or not the return payload is a collection (in which case returnPayload gives the
* type of the items in the collection) or not.
*/
private boolean isCollection = false;
private final String path;
private String[] produces;
private String[] consumes;
private final OptionsCapable context;
public RestMethodMetadata(OptionsCapable context, Method method, Annotation designator) {
this.context = context;
this.httpMethod = designator.getClass().getInterfaces()[0].getSimpleName();
this.returnPayload = calculateReturnPayload(method);
this.path = getPath(method);
Consumes cann = getAnnotation(Consumes.class, method);
Produces pann = getAnnotation(Produces.class, method);
if (cann != null) {
consumes = cann.value();
}
if (pann != null) {
produces = pann.value();
}
processParameters(method);
}
private T getAnnotation(Class annoClass, Method method) {
T annotation = (T)method.getAnnotation((Class)annoClass);
if (annotation == null) {
annotation = (T)method.getDeclaringClass().getAnnotation((Class)annoClass);
}
return annotation;
}
public String getHttpMethod() {
return httpMethod;
}
public void setHttpMethod(String httpMethod) {
this.httpMethod = httpMethod;
}
public List getQueryParameters() {
return queryParameters;
}
public void setQueryParameters(List queryParameters) {
this.queryParameters = queryParameters;
}
public Type getRequestPayload() {
return requestPayload;
}
public void setRequestPayload(Type requestPayload) {
this.requestPayload = requestPayload;
}
public Type getReturnPayload() {
return returnPayload;
}
public void setReturnPayload(Type returnPayload) {
this.returnPayload = returnPayload;
}
public boolean getIsCollection() {
return isCollection;
}
public void setIsCollection(boolean isCollection) {
this.isCollection = isCollection;
}
@Override
public String toString() {
try {
return toJson().toString();
} catch (JsonException ex) {
return ex.getMessage();
}
}
/**
* Build and return a Json object representing the metadata for the resource method
* @return
* @throws JsonException
*/
public JsonObject toJson() throws JsonException {
JsonObjectBuilder o = Json.createObjectBuilder();
if (path != null) {
o.add("path", path);
}
JsonObjectBuilder queryParamJson = Json.createObjectBuilder();
for (ParamMetadata pmd : queryParameters) {
queryParamJson.add(pmd.getName(), pmd.toJson());
}
if (consumes != null) {
JsonArrayBuilder array = Json.createArrayBuilder();
for (String type : consumes) {
array.add(type);
}
o.add("accepts", array);
}
if (produces != null) {
JsonArrayBuilder array = Json.createArrayBuilder();
for (String type : produces) {
array.add(type);
}
o.add("produces", array);
}
o.add("queryParams", queryParamJson);
if (requestPayload != null) {
JsonObjectBuilder requestProps = Json.createObjectBuilder();
requestProps.add("isCollection", isCollection);
requestProps.add("dataType", getTypeString(requestPayload));
requestProps.add("properties", getProperties(requestPayload));
o.add("request", requestProps);
}
if (returnPayload != null) {
JsonObjectBuilder returnProps = Json.createObjectBuilder();
returnProps.add("isCollection", isCollection);
returnProps.add("dataType", getTypeString(returnPayload));
returnProps.add("properties", getProperties(returnPayload));
o.add("response", returnProps);
}
return o.build();
}
/**
* Get the return type of the method. If the return type is a generic type, then extract the first generic type
* from the declaration via reflection. This method does not take into account types with multiple generic types,
* but, given the style guide, this should not be an issue. If the style guide is modified to allow non-RestModel and
* non-RestCollection returns (for example), this may need to be modified.
* @param method
* @return
*/
private Type calculateReturnPayload(Method method) {
final Type grt = method.getGenericReturnType();
Type value = method.getReturnType();
if (ParameterizedType.class.isAssignableFrom(grt.getClass())) {
final ParameterizedType pt = (ParameterizedType) grt;
if (RestCollection.class.isAssignableFrom((Class) pt.getRawType())) {
isCollection = true;
value = Util.getFirstGenericType(grt);
} else if (RestModel.class.isAssignableFrom((Class)pt.getRawType())) {
value = Util.getFirstGenericType(grt);
}
}
return value;
}
private Type calculateParameterType(Type paramType) {
Type type;
if (Util.isGenericType(paramType)) {
ParameterizedType pt = (ParameterizedType) paramType;
Class first = Util.getFirstGenericType(paramType);
if (RestModel.class.isAssignableFrom(first) || RestCollection.class.isAssignableFrom(first)) {
// if ((first instanceof RestModel.class) || (first instanceof RestCollection.class)) {
type = first;
} else {
type = pt;
}
} else {
type = paramType;
}
return type;
}
private String getPath(Method method) {
Path p = method.getAnnotation(Path.class);
if (p != null) {
return p.value();
} else {
return null;
}
}
/**
* Process the parameters for the method. Any parameter marked @PathParam is ignored, since JAX-RS
* handles setting that value, meaning its presence need not be exposed to the client. Any parameter marked with
* @QueryParameter is stored in the queryParameter list. Anything left is considered the
* type of the request body. There should be only one of these.
* @param method
*/
private void processParameters(Method method) {
Type[] paramTypes = method.getGenericParameterTypes();
Annotation[][] paramAnnos = method.getParameterAnnotations();
int paramCount = paramTypes.length;
for (int i = 0; i < paramCount; i++) {
boolean processed = false;
boolean isPathParam = false;
Type paramType = paramTypes[i];
for (Annotation annotation : paramAnnos[i]) {
processed =
(annotation instanceof Suspended) ||
(annotation instanceof PathParam);
if (annotation instanceof QueryParam) {
queryParameters.add(new ParamMetadata(context,
paramType,
((QueryParam)annotation).value(),
paramAnnos[i]));
processed = true;
}
}
if (!processed && !isPathParam) {
requestPayload = calculateParameterType(paramType);
}
}
}
/**
* This method will analyze the getters of the given class to determine its properties. Currently, for simplicity's
* sake, only getters are checked.
* @param type
* @return
* @throws JsonException
*/
private JsonObject getProperties(Type type) throws JsonException {
JsonObjectBuilder props = Json.createObjectBuilder();
Class clazz;
Map map = new HashMap();
if (Util.isGenericType(type)) {
ParameterizedType pt = (ParameterizedType)type;
clazz = (Class)pt.getRawType();
// if (RestModel.class.isAssignableFrom(clazz) || RestCollection.class.isAssignableFrom(clazz)) {
// Object model = CompositeUtil.instance().getModel(clazz);
// clazz = model.getClass();
// }
} else {
clazz = (Class) type;
}
if (RestModel.class.isAssignableFrom(clazz) || RestCollection.class.isAssignableFrom(clazz)) {
for (Method m : clazz.getMethods()) {
String methodName = m.getName();
if (methodName.startsWith("get")) {
String propertyName = methodName.substring(3, 4).toLowerCase(Locale.getDefault()) + methodName.substring(4);
map.put(propertyName, new ParamMetadata(context, m.getGenericReturnType(), propertyName, m.getAnnotations()));
}
}
for (Map.Entry entry : map.entrySet()) {
props.add(entry.getKey(), entry.getValue().toJson());
}
}
return props.build();
}
protected String getTypeString(Type clazz) {
StringBuilder sb = new StringBuilder();
if (Util.isGenericType(clazz)) {
ParameterizedType pt = (ParameterizedType)clazz;
sb.append(((Class)pt.getRawType()).getSimpleName());
Type [] typeArgs = pt.getActualTypeArguments();
if ((typeArgs != null) && (typeArgs.length >= 1)) {
String sep = "";
sb.append("<");
for (Type arg : typeArgs) {
sb.append(sep)
.append(((Class)arg).getSimpleName());
sep=",";
}
sb.append(">");
}
} else {
sb.append(((Class)clazz).getSimpleName());
}
return sb.toString();
}
}
