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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;

import org.bouncycastle.bcpg.HashAlgorithmTags;

public enum HashAlgorithm
{
    SHA1 ( HashAlgorithmTags.SHA1, "sha" ),
    SHA256 ( HashAlgorithmTags.SHA256, "sha256" ),
    SHA512 ( HashAlgorithmTags.SHA512, "sha512" );

    private int value;

    private String id;

    private HashAlgorithm ( final int value, final String id )
    {
        this.value = value;
        this.id = id;
    }

    public int getValue ()
    {
        return this.value;
    }

    public String getId ()
    {
        return this.id;
    }

    /**
     * Get a hash algorithm from a string
     * 
     * This method will return the hash algorithm as specified by the
     * parameter "name". If this parameter is {@code null} or an empty
     * string, then the default algorithm {@link #SHA1} will be returned. If
     * algorithm is an invalid name, then an exception is thrown.
     * 
     *
     * @param name
     *            the name of hash algorithm, or {@code null}
     * @return a hash algorithm
     * @throws IllegalArgumentException
     *             if the name was provided, but is invalid
     */
    public static HashAlgorithm from ( final String name )
    {
        if ( name == null || name.isEmpty () )
        {
            return SHA1;
        }

        return HashAlgorithm.valueOf ( name );
    }
}