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