HaHaWTH
47 lines
1.6 KiB
Java
47 lines
1.6 KiB
Java
package fr.xephi.authme.util;
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import com.google.common.collect.Sets;
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import java.util.Set;
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/**
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* Utilities for exceptions.
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*/
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public final class ExceptionUtils {
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private ExceptionUtils() {
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}
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/**
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* Returns the first throwable of the given {@code wantedThrowableType} by visiting the provided
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* throwable and its causes recursively.
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*
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* @param wantedThrowableType the throwable type to find
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* @param throwable the throwable to start with
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* @param <T> the desired throwable subtype
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* @return the first throwable found of the given type, or null if none found
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*/
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public static <T extends Throwable> T findThrowableInCause(Class<T> wantedThrowableType, Throwable throwable) {
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Set<Throwable> visitedObjects = Sets.newIdentityHashSet();
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Throwable currentThrowable = throwable;
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while (currentThrowable != null && !visitedObjects.contains(currentThrowable)) {
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if (wantedThrowableType.isInstance(currentThrowable)) {
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return wantedThrowableType.cast(currentThrowable);
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}
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visitedObjects.add(currentThrowable);
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currentThrowable = currentThrowable.getCause();
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}
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return null;
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}
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/**
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* Format the information from a Throwable as string, retaining the type and its message.
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*
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* @param th the throwable to process
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* @return string with the type of the Throwable and its message, e.g. "[IOException]: Could not open stream"
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*/
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public static String formatException(Throwable th) {
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return "[" + th.getClass().getSimpleName() + "]: " + th.getMessage();
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}
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}
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