/*
* ToroDB
* Copyright © 2014 8Kdata Technology (www.8kdata.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.torodb.common.util;
import java.util.concurrent.CompletionException;
/**
*
*/
public class CompletionExceptions {
private CompletionExceptions() {
}
/**
* Returns the first cause of the given exception that is not a {@link CompletionException} or the
* deepest CompletionException if there are no exception different than CompletionException in the
* stack.
*
* @param ex
* @return
*/
public static Throwable getFirstNonCompletionException(Throwable ex) {
Throwable t = ex;
while (t instanceof CompletionException && t != t.getCause() && t.getCause() != null) {
Throwable cause = t.getCause();
if (cause == null) {
return t;
}
t = cause;
}
assert t != null;
assert !(t instanceof CompletionException) || t.getCause() == null;
return t;
}
}