/**
* Returns a new Java function instance.
*
* @param name function name
* @param args arguments
* @param qc query context
* @param sc static context
* @param ii input info
* @return Java function or {@code null}
* @throws QueryException query exception
*/
static JavaMapping get(
final QNm name,
final Expr[] args,
final QueryContext qc,
final StaticContext sc,
final InputInfo ii)
throws QueryException {
final byte[] uri = name.uri();
// check if URI starts with "java:" prefix (if yes, module must be Java code)
final boolean java = startsWith(uri, JAVAPREF);
// rewrite function name: convert dashes to upper-case initials
final String local = camelCase(string(name.local()));
// check imported Java modules
final String path = camelCase(toPath(java ? substring(uri, JAVAPREF.length) : uri));
final ModuleLoader modules = qc.resources.modules();
final Object jm = modules.findImport(path);
if (jm != null) {
final Method meth = getModMethod(jm, path, local, args.length, qc, ii);
if (meth != null) return new JavaModuleFunc(sc, ii, jm, meth, args);
}
// only allowed with administrator permissions
if (!qc.context.user.has(Perm.ADMIN)) return null;
// check addressed class
try {
return new JavaFunc(sc, ii, modules.findClass(path), local, args);
} catch (final ClassNotFoundException ex) {
// only throw exception if "java:" prefix was explicitly specified
if (java) throw FUNCJAVA_X.get(ii, path);
} catch (final Throwable th) {
throw JAVAINIT_X.get(ii, th);
}
// no function found
return null;
}
/**
* Returns a parameter.
*
* @param value value
* @param name name
* @param declared variable declaration flags
* @return parameter
* @throws QueryException HTTP exception
*/
private RestXqParam param(final Value value, final QNm name, final boolean[] declared)
throws QueryException {
// [CG] RESTXQ: allow identical field names?
final long vs = value.size();
if (vs < 2) error(ANN_PARAMS, "%", name.string(), 2);
// name of parameter
final String key = toString(value.itemAt(0), name);
// variable template
final QNm qnm = checkVariable(toString(value.itemAt(1), name), declared);
// default value
final ValueBuilder vb = new ValueBuilder();
for (int v = 2; v < vs; v++) vb.add(value.itemAt(v));
return new RestXqParam(qnm, key, vb.value());
}
/**
* Returns the specified value as an atomic string.
*
* @param value value
* @param name name
* @return string
* @throws QueryException HTTP exception
*/
private String toString(final Value value, final QNm name) throws QueryException {
if (!(value instanceof Str)) error(ANN_STRING, "%", name.string(), value);
return ((Str) value).toJava();
}
/**
* Checks a function for RESTFful annotations.
*
* @return {@code true} if module contains relevant annotations
* @throws QueryException query exception
*/
boolean analyze() throws QueryException {
// parse all annotations
final EnumSet<HTTPMethod> mth = EnumSet.noneOf(HTTPMethod.class);
final boolean[] declared = new boolean[function.args.length];
boolean found = false;
final int as = function.ann.size();
for (int a = 0; a < as; a++) {
final QNm name = function.ann.names[a];
final Value value = function.ann.values[a];
final byte[] local = name.local();
final byte[] uri = name.uri();
final boolean rexq = eq(uri, QueryText.RESTXQURI);
if (rexq) {
if (eq(PATH, local)) {
// annotation "path"
if (path != null) error(ANN_TWICE, "%", name.string());
path = new RestXqPath(toString(value, name));
for (final String s : path) {
if (s.trim().startsWith("{")) checkVariable(s, AtomType.AAT, declared);
}
} else if (eq(CONSUMES, local)) {
// annotation "consumes"
strings(value, name, consumes);
} else if (eq(PRODUCES, local)) {
// annotation "produces"
strings(value, name, produces);
} else if (eq(QUERY_PARAM, local)) {
// annotation "query-param"
queryParams.add(param(value, name, declared));
} else if (eq(FORM_PARAM, local)) {
// annotation "form-param"
formParams.add(param(value, name, declared));
} else if (eq(HEADER_PARAM, local)) {
// annotation "header-param"
headerParams.add(param(value, name, declared));
} else if (eq(COOKIE_PARAM, local)) {
// annotation "cookie-param"
cookieParams.add(param(value, name, declared));
} else {
// method annotations
final HTTPMethod m = HTTPMethod.get(string(local));
if (m == null) error(ANN_UNKNOWN, "%", name.string());
if (!value.isEmpty()) {
// remember post/put variable
if (requestBody != null) error(ANN_TWICE, "%", name.string());
if (m != POST && m != PUT) error(METHOD_VALUE, m);
requestBody = checkVariable(toString(value, name), declared);
}
if (mth.contains(m)) error(ANN_TWICE, "%", name.string());
mth.add(m);
}
} else if (eq(uri, QueryText.OUTPUTURI)) {
// serialization parameters
final String key = string(local);
final String val = toString(value, name);
if (output.get(key) == null) error(UNKNOWN_SER, key);
output.set(key, val);
}
found |= rexq;
}
if (!mth.isEmpty()) methods = mth;
if (found) {
if (path == null) error(ANN_MISSING, PATH);
for (int i = 0; i < declared.length; i++)
if (!declared[i]) error(VAR_UNDEFINED, function.args[i].name.string());
}
return found;
}