/*
* Copyright 2012 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.web.bindery.requestfactory.vm.impl;
import java.util.Comparator;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Orders classes by assignability, with most-derived types ordered first, and then by name.
*/
class ClassComparator implements Comparator<String> {
private static final Logger log = Logger.getLogger(ClassComparator.class.getName());
private final ClassLoader resolveClassesWith;
public ClassComparator(ClassLoader resolveClassesWith) {
this.resolveClassesWith = resolveClassesWith;
}
@Override
public int compare(String className1, String className2) {
Class<?> class1 = forName(className1);
Class<?> class2 = forName(className2);
if (class1.equals(class2)) {
return 0;
} else if (class1.isAssignableFrom(class2)) {
return 1;
} else if (class2.isAssignableFrom(class1)) {
return -1;
}
return className1.compareTo(className2);
}
private Class<?> forName(String name) {
try {
return Class.forName(name, false, resolveClassesWith);
} catch (ClassNotFoundException e) {
String msg = "Could not locate class " + name;
log.log(Level.SEVERE, msg, e);
throw new RuntimeException(msg, e);
}
}
};