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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you 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.apache.sshd.common.config.keys.impl;

import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.Collection;
import java.util.Collections;
import java.util.NavigableSet;
import java.util.Objects;

import org.apache.sshd.common.config.keys.IdentityResourceLoader;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.logging.AbstractLoggingBean;

/**
 * @param   Generic public key type
 * @param   Generic private key type
 * @author       Apache MINA SSHD Project
 */
public abstract class AbstractIdentityResourceLoader
        extends AbstractLoggingBean
        implements IdentityResourceLoader {
    private final Class pubType;
    private final Class prvType;
    private final NavigableSet types;

    protected AbstractIdentityResourceLoader(
                                             Class pubType, Class prvType, Collection keyTypes) {
        this.pubType = Objects.requireNonNull(pubType, "No public key type specified");
        this.prvType = Objects.requireNonNull(prvType, "No private key type specified");
        this.types = Collections.unmodifiableNavigableSet(
                GenericUtils.asSortedSet(String.CASE_INSENSITIVE_ORDER,
                        ValidateUtils.checkNotNullAndNotEmpty(keyTypes, "No key type names provided")));
    }

    @Override
    public final Class getPublicKeyType() {
        return pubType;
    }

    @Override
    public final Class getPrivateKeyType() {
        return prvType;
    }

    @Override
    public NavigableSet getSupportedKeyTypes() {
        return types;
    }
}