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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.apache.jackrabbit.webdav.observation;

import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.DavServletRequest;

/**
 * ObservationDavServletRequest provides extensions to the
 * {@link DavServletRequest} interface used for dealing with observation.
 */
public interface ObservationDavServletRequest extends DavServletRequest {

    /**
     * Return the {@link ObservationConstants#HEADER_SUBSCRIPTIONID SubscriptionId header}
     * or null if no such header is present.
     *
     * @return the {@link ObservationConstants#HEADER_SUBSCRIPTIONID SubscriptionId header}
     */
    public String getSubscriptionId();

    /**
     * Returns the {@link ObservationConstants#HEADER_POLL_TIMEOUT PollTimeout header}
     * or 0 (zero) if no such header is present.
     *
     * @return milliseconds indicating length of the poll timeout.
     */
    public long getPollTimeout();

    /**
     * Return a {@link SubscriptionInfo} object representing the subscription
     * info present in the SUBSCRIBE request body or null if
     * retrieving the subscription info fails.
     *
     * @return subscription info object encapsulating the SUBSCRIBE request body
     * or null if the subscription info cannot be built.
     * @throws DavException if an invalid request body was encountered.
     */
    public SubscriptionInfo getSubscriptionInfo() throws DavException;
}