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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.eclipse.aether;

import java.util.List;

import static java.util.Objects.requireNonNull;

/**
 * Runtime exception to be thrown when multiple actions were executed and one or more failed. To be used when no
 * fallback on resolver side is needed or is possible.
 *
 * @since 1.9.0
 */
public final class MultiRuntimeException extends RuntimeException {
    private final List throwables;

    private MultiRuntimeException(String message, List throwables) {
        super(message);
        this.throwables = throwables;
        for (Throwable throwable : throwables) {
            addSuppressed(throwable);
        }
    }

    /**
     * Returns the list of throwables that are wrapped in this exception.
     *
     * @return The list of throwables, never {@code null}.
     */
    public List getThrowables() {
        return throwables;
    }

    /**
     * Helper method that receives a (non-null) message and (non-null) list of throwable, and following happens:
     * 
     *     if list is empty - nothing
     *     if list not empty - {@link MultiRuntimeException} is thrown wrapping all elements
     * 
     */
    public static void mayThrow(String message, List throwables) {
        requireNonNull(message);
        requireNonNull(throwables);

        if (!throwables.isEmpty()) {
            throw new MultiRuntimeException(message, throwables);
        }
    }
}