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etcd3 java client and utilities

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/*
 * Copyright 2017, 2018 IBM Corp. All Rights Reserved.
 *
 * 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.ibm.etcd.client.watch;

import com.ibm.etcd.api.ResponseHeader;

/**
 * Indicates the watch was cancelled by the server
 */
public class WatchCancelledException extends RuntimeException {

    private static final long serialVersionUID = 6922272835138905911L;
    
    protected final ResponseHeader header;
    protected final String reason;

    WatchCancelledException(String message, ResponseHeader header, String reason) {
        super(message==null?reason:(reason==null?message:(message+"; "+reason)));
        this.header = header;
        this.reason = reason;
    }

    WatchCancelledException(ResponseHeader header, String reason) {
        this("Watch was cancelled by the server unexpectedly", header, reason);
    }
    
    /**
     * @return the etcd response header returned with the cancellation response
     */
    public ResponseHeader getHeader() {
        return header;
    }
    
    /**
     * @return the reason for the cancellation, if provided
     */
    public String getReason() {
        return reason;
    }
}