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/**
 * Copyright (c) 2016, 2019 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0
 *
 * SPDX-License-Identifier: EPL-2.0
 */

package org.eclipse.packager.rpm.signature;

import java.nio.ByteBuffer;

import org.eclipse.packager.rpm.RpmSignatureTag;
import org.eclipse.packager.rpm.header.Header;

/**
 * Process data for creating a signature
 * 
 * The call flow is like this:
 * 
 * 
 * one call to {@link #init(long)}
 * one call to {@link #feedHeader(ByteBuffer)}
 * zero or more calls to {@link #feedPayloadData(ByteBuffer)}, feeding the
 * full, compressed, payload stream
 * one call to {@link #finish(Header)}
 * 
 */
public interface SignatureProcessor
{
    /**
     * initialize the processor
     *
     * @param archiveSize
     *            the size of the uncompressed payload archive
     */
    public default void init ( final long archiveSize )
    {
    }

    public void feedHeader ( ByteBuffer header );

    public void feedPayloadData ( ByteBuffer data );

    public void finish ( Header signature );
}