/*
* Copyright (C) 2012-2016 Markus Junginger, greenrobot (http://greenrobot.org)
*
* 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 org.greenrobot.eventbus.util;
import android.util.Log;
import org.greenrobot.eventbus.EventBus;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
/**
* Maps throwables to texts for error dialogs. Use Config to configure the mapping.
*
* @author Markus
*/
public class ExceptionToResourceMapping {
public final Map<Class<? extends Throwable>, Integer> throwableToMsgIdMap;
public ExceptionToResourceMapping() {
throwableToMsgIdMap = new HashMap<Class<? extends Throwable>, Integer>();
}
/** Looks at the exception and its causes trying to find an ID. */
public Integer mapThrowable(final Throwable throwable) {
Throwable throwableToCheck = throwable;
int depthToGo = 20;
while (true) {
Integer resId = mapThrowableFlat(throwableToCheck);
if (resId != null) {
return resId;
} else {
throwableToCheck = throwableToCheck.getCause();
depthToGo--;
if (depthToGo <= 0 || throwableToCheck == throwable || throwableToCheck == null) {
Log.d(EventBus.TAG, "No specific message ressource ID found for " + throwable);
// return config.defaultErrorMsgId;
return null;
}
}
}
}
/** Mapping without checking the cause (done in mapThrowable). */
protected Integer mapThrowableFlat(Throwable throwable) {
Class<? extends Throwable> throwableClass = throwable.getClass();
Integer resId = throwableToMsgIdMap.get(throwableClass);
if (resId == null) {
Class<? extends Throwable> closestClass = null;
Set<Entry<Class<? extends Throwable>, Integer>> mappings = throwableToMsgIdMap.entrySet();
for (Entry<Class<? extends Throwable>, Integer> mapping : mappings) {
Class<? extends Throwable> candidate = mapping.getKey();
if (candidate.isAssignableFrom(throwableClass)) {
if (closestClass == null || closestClass.isAssignableFrom(candidate)) {
closestClass = candidate;
resId = mapping.getValue();
}
}
}
}
return resId;
}
public ExceptionToResourceMapping addMapping(Class<? extends Throwable> clazz, int msgId) {
throwableToMsgIdMap.put(clazz, msgId);
return this;
}
}