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/*
 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
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 *
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package java.security;

import java.io.*;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;

/**
 * This class defines the Service Provider Interface (SPI)
 * for the {@code AlgorithmParameters} class, which is used to manage
 * algorithm parameters.
 *
 *  All the abstract methods in this class must be implemented by each
 * cryptographic service provider who wishes to supply parameter management
 * for a particular algorithm.
 *
 * @author Jan Luehe
 *
 *
 * @see AlgorithmParameters
 * @see java.security.spec.AlgorithmParameterSpec
 * @see java.security.spec.DSAParameterSpec
 *
 * @since 1.2
 */

public abstract class AlgorithmParametersSpi {

    /**
     * Constructor for subclasses to call.
     */
    public AlgorithmParametersSpi() {}

    /**
     * Initializes this parameters object using the parameters
     * specified in {@code paramSpec}.
     *
     * @param paramSpec the parameter specification.
     *
     * @throws    InvalidParameterSpecException if the given parameter
     * specification is inappropriate for the initialization of this parameter
     * object.
     */
    protected abstract void engineInit(AlgorithmParameterSpec paramSpec)
        throws InvalidParameterSpecException;

    /**
     * Imports the specified parameters and decodes them
     * according to the primary decoding format for parameters.
     * The primary decoding format for parameters is ASN.1, if an ASN.1
     * specification for this type of parameters exists.
     *
     * @param params the encoded parameters.
     *
     * @throws    IOException on decoding errors
     */
    protected abstract void engineInit(byte[] params)
        throws IOException;

    /**
     * Imports the parameters from {@code params} and
     * decodes them according to the specified decoding format.
     * If {@code format} is null, the
     * primary decoding format for parameters is used. The primary decoding
     * format is ASN.1, if an ASN.1 specification for these parameters
     * exists.
     *
     * @param params the encoded parameters.
     *
     * @param format the name of the decoding format.
     *
     * @throws    IOException on decoding errors
     */
    protected abstract void engineInit(byte[] params, String format)
        throws IOException;

    /**
     * Returns a (transparent) specification of this parameters
     * object.
     * {@code paramSpec} identifies the specification class in which
     * the parameters should be returned. It could, for example, be
     * {@code DSAParameterSpec.class}, to indicate that the
     * parameters should be returned in an instance of the
     * {@code DSAParameterSpec} class.
     *
     * @param  the type of the parameter specification to be returned
     *
     * @param paramSpec the specification class in which
     * the parameters should be returned.
     *
     * @return the parameter specification.
     *
     * @throws    InvalidParameterSpecException if the requested parameter
     * specification is inappropriate for this parameter object.
     */
    protected abstract
        
        T engineGetParameterSpec(Class paramSpec)
        throws InvalidParameterSpecException;

    /**
     * Returns the parameters in their primary encoding format.
     * The primary encoding format for parameters is ASN.1, if an ASN.1
     * specification for this type of parameters exists.
     *
     * @return the parameters encoded using their primary encoding format.
     *
     * @throws    IOException on encoding errors.
     */
    protected abstract byte[] engineGetEncoded() throws IOException;

    /**
     * Returns the parameters encoded in the specified format.
     * If {@code format} is null, the
     * primary encoding format for parameters is used. The primary encoding
     * format is ASN.1, if an ASN.1 specification for these parameters
     * exists.
     *
     * @param format the name of the encoding format.
     *
     * @return the parameters encoded using the specified encoding scheme.
     *
     * @throws    IOException on encoding errors.
     */
    protected abstract byte[] engineGetEncoded(String format)
        throws IOException;

    /**
     * Returns a formatted string describing the parameters.
     *
     * @return a formatted string describing the parameters.
     */
    protected abstract String engineToString();
}