package act.handler.builtin.controller;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import act.app.ActionContext;
import act.plugin.Plugin;
import act.security.CORS;
import org.osgl.mvc.result.Result;
import org.osgl.util.C;
import org.osgl.util.E;
import java.util.Comparator;
import java.util.List;
public abstract class ExceptionInterceptor
extends Handler<ExceptionInterceptor>
implements Plugin, ExceptionInterceptorInvoker, Comparable<ExceptionInterceptor> {
private List<Class<? extends Exception>> exClasses;
public ExceptionInterceptor() {
this(0);
}
@SuppressWarnings("unchecked")
public ExceptionInterceptor(int priority) {
this(priority, new Class[]{});
}
public ExceptionInterceptor(Class<? extends Exception>... exClasses) {
this(0, exClasses);
}
public ExceptionInterceptor(int priority, Class<? extends Exception>... exClasses) {
super(priority);
this.exClasses = C.listOf(exClasses).sorted(EXCEPTION_WEIGHT_COMPARATOR);
}
public ExceptionInterceptor(int priority, List<Class<? extends Exception>> exClasses) {
super(priority);
E.illegalArgumentIf(exClasses.isEmpty());
this.exClasses = C.list(exClasses).sorted(EXCEPTION_WEIGHT_COMPARATOR);
}
@Override
public Result handle(Exception e, ActionContext actionContext) throws Exception {
if (exClasses.isEmpty()) {
return internalHandle(e, actionContext);
}
for (Class<? extends Exception> c : exClasses) {
if (c.isInstance(e)) {
return internalHandle(e, actionContext);
}
}
return null;
}
@Override
public int compareTo(ExceptionInterceptor o) {
if (o == this) return 0;
boolean iAmEmpty = exClasses.isEmpty(), uAreEmpty = o.exClasses.isEmpty();
if (iAmEmpty) {
return uAreEmpty ? 0 : 1;
} else if (uAreEmpty) {
return -1;
}
return EXCEPTION_WEIGHT_COMPARATOR.compare(o.exClasses.get(0), exClasses.get(0));
}
@Override
public CORS.Spec corsSpec() {
return CORS.Spec.DUMB;
}
protected abstract Result internalHandle(Exception e, ActionContext actionContext) throws Exception;
@Override
public void register() {
RequestHandlerProxy.registerGlobalInterceptor(this);
}
public static Comparator<Class<? extends Exception>> EXCEPTION_WEIGHT_COMPARATOR = new Comparator<Class<? extends Exception>>() {
@Override
public int compare(Class<? extends Exception> o1, Class<? extends Exception> o2) {
return weight(o1) - weight(o2);
}
};
public static int weight(Class c) {
int i = 0;
while (c != Object.class) {
i++;
c = c.getSuperclass();
}
return i;
}
}