/*
 * 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.loader.putty;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;

import org.apache.sshd.common.config.keys.loader.KeyPairResourceParser;

/**
 * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
 */
public final class PuttyKeyUtils {
    public static final List<PuttyKeyPairResourceParser> DEFAULT_PARSERS =
            Collections.unmodifiableList(
                    Arrays.asList(
                            RSAPuttyKeyDecoder.INSTANCE,
                            DSSPuttyKeyDecoder.INSTANCE));
    public static final SortedMap<String, PuttyKeyPairResourceParser> BY_KEY_TYPE =
            Collections.unmodifiableSortedMap(
                    new TreeMap<String, PuttyKeyPairResourceParser>(String.CASE_INSENSITIVE_ORDER) {
                        // Not serializing it
                        private static final long serialVersionUID = 1L;

                        {
                            for (PuttyKeyPairResourceParser p : DEFAULT_PARSERS) {
                                put(p.getKeyType(), p);
                            }
                        }
            });

    public static final KeyPairResourceParser DEFAULT_INSTANCE =
            KeyPairResourceParser.aggregate(DEFAULT_PARSERS);

    private PuttyKeyUtils() {
        throw new UnsupportedOperationException("No instance");
    }
}