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The official Couchbase JVM Core IO Library
/*
* Copyright 2019 Couchbase, Inc.
*
* 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 com.couchbase.client.core.util;
import com.couchbase.client.core.annotation.Stability;
import com.couchbase.client.core.error.CouchbaseException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Optional;
import static java.util.Objects.requireNonNull;
@Stability.Internal
public class CbThrowables {
private CbThrowables() {
throw new AssertionError("not instantiable");
}
/**
* Walks the causal chain of the given throwable (starting with the given throwable itself)
* and returns the first throwable that is an instance of the specified type.
*/
public static Optional findCause(Throwable t, final Class type) {
for (; t != null; t = t.getCause()) {
if (type.isAssignableFrom(t.getClass())) {
return Optional.of(type.cast(t));
}
}
return Optional.empty();
}
/**
* Returns true if the given throwable or any throwable in its causal chain is an instance of the given type.
*/
public static boolean hasCause(Throwable t, final Class type) {
return findCause(t, type).isPresent();
}
/**
* If the given Throwable is an instance of RuntimeException or Error, throw it.
* Otherwise do nothing.
*/
public static void throwIfUnchecked(Throwable t) {
requireNonNull(t);
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
}
if (t instanceof Error) {
throw (Error) t;
}
}
/**
* If the given Throwable is an instance of the given class, throw it.
* Otherwise do nothing.
*/
public static void throwIfInstanceOf(Throwable t, Class clazz) throws T {
requireNonNull(t);
if (clazz.isInstance(t)) {
throw clazz.cast(t);
}
}
/**
* Throws the given throwable if it is unchecked, otherwise throws
* a new CouchbaseException with the given exception as a cause.
*
* @return this function always throws an exception, and never returns a value
*/
public static RuntimeException propagate(Throwable t) {
throwIfUnchecked(t);
throw new CouchbaseException(t.getMessage(), t);
}
public static String getStackTraceAsString(Throwable t) {
StringWriter w = new StringWriter();
t.printStackTrace(new PrintWriter(w));
return w.toString();
}
}