/**
* A helper method that returns the parsed default value of a given NamedParameter.
*
* @return null or an empty set if there is no default value, the default value (or set of values)
* otherwise.
* @throws ClassHierarchyException if a default value was specified, but could not be parsed, or
* if a set of values were specified for a non-set parameter.
*/
@SuppressWarnings("unchecked")
@Override
public <T> T parseDefaultValue(final NamedParameterNode<T> name) {
final String[] vals = name.getDefaultInstanceAsStrings();
final T[] ret = (T[]) new Object[vals.length];
for (int i = 0; i < vals.length; i++) {
final String val = vals[i];
try {
ret[i] = parse(name, val);
} catch (final ParseException e) {
throw new ClassHierarchyException("Could not parse default value", e);
}
}
if (name.isSet()) {
return (T) new HashSet<T>(Arrays.asList(ret));
} else if (name.isList()) {
return (T) new ArrayList<T>(Arrays.asList(ret));
} else {
if (ret.length == 0) {
return null;
} else if (ret.length == 1) {
return ret[0];
} else {
throw new IllegalStateException(
"Multiple defaults for non-set named parameter! " + name.getFullName());
}
}
}
public ClassHierarchyImpl(
final URL[] jars, final Class<? extends ExternalConstructor<?>>[] parameterParsers) {
this.namespace = JavaNodeFactory.createRootPackageNode();
this.jars = new ArrayList<>(Arrays.asList(jars));
this.loader = new URLClassLoader(jars, this.getClass().getClassLoader());
for (final Class<? extends ExternalConstructor<?>> p : parameterParsers) {
try {
parameterParser.addParser(p);
} catch (final BindException e) {
throw new IllegalArgumentException("Could not register parameter parsers", e);
}
}
}