/*
 * Copyright (C) 2016 Red Hat, 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 io.syndesis.server.endpoint.v1.handler.exception;

import io.syndesis.server.endpoint.v1.SyndesisRestException;

public final class Errors {

    private Errors() {
        // utility class
    }

    public static String userMessageFrom(final Throwable throwable) {
        final SyndesisRestException restException = findException(throwable, SyndesisRestException.class);
        if (restException != null) {
            return restException.getUserMsg();
        }

        return throwable.getMessage();
    }

    private static <T extends Throwable> T findException(final Throwable top, final Class<T> type) {
        Throwable current = top;
        while (current != null && current.getCause() != current) {
            if (type.isInstance(current)) {
                return type.cast(current);
            }

            current = current.getCause();
        }

        return null;
    }
}
