/*
 * Copyright 2015 Open Networking Laboratory
 *
 * 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 org.onlab.packet;

/**
 * Packet Interface.
 */
public interface IPacket {

    /**
     * Obtain the packet payload.
     *
     * @return the payload
     */
    IPacket getPayload();

    /**
     * Assign the packet payload.
     *
     * @param packet new payload
     * @return self
     */
    IPacket setPayload(IPacket packet);

    /**
     * Obtain the parent packet.
     *
     * @return parent packet
     */
    IPacket getParent();

    /**
     * Configure a new parent packet.
     *
     * @param packet new parent
     * @return self
     */
    IPacket setParent(IPacket packet);

    /**
     * Reset any checksum as needed, and call resetChecksum on all parents.
     */
    void resetChecksum();

    /**
     * Sets all payloads parent packet if applicable, then serializes this
     * packet and all payloads.
     *
     * @return a byte[] containing this packet and payloads
     */
    byte[] serialize();

    /**
     * Deserialize this packet layer and all possible payloads.
     *
     * NOTE: This method has been deprecated and will be removed in a future
     * release. It is now recommended to use the Deserializer function provided
     * by the deserialize() method on each packet to deserialize them. The
     * Deserializer functions are robust to malformed input.
     *
     * @param data bytes to deserialize
     * @param offset
     *            offset to start deserializing from
     * @param length
     *            length of the data to deserialize
     * @return the deserialized data
     * @deprecated in Cardinal Release
     */
    @Deprecated
    IPacket deserialize(byte[] data, int offset, int length);

    /**
     * Clone this packet and its payload packet but not its parent.
     *
     * @return the clone
     */
    Object clone();
}