/*
 * Copyright by the original author or authors.
 *
 * 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.bitcoinj.core;

import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>Sent by a peer when a getdata request doesn't find the requested data in the mempool. It has the same format
 * as an inventory message and lists the hashes of the missing items.</p>
 * 
 * <p>Instances of this class are not safe for use by multiple threads.</p>
 */
public class NotFoundMessage extends InventoryMessage {
    public static int MIN_PROTOCOL_VERSION = 70001;

    /**
     * Deserialize this message from a given payload.
     *
     * @param payload payload to deserialize from
     * @return read message
     * @throws BufferUnderflowException if the read message extends beyond the remaining bytes of the payload
     */
    public static NotFoundMessage read(ByteBuffer payload) throws BufferUnderflowException, ProtocolException {
        return new NotFoundMessage(readItems(payload));
    }

    public NotFoundMessage() {
        super();
    }

    public NotFoundMessage(List<InventoryItem> items) {
        super(new ArrayList<>(items));
    }
}
