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Utility classes for Jetty
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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.util;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.Set;

/**
 * An empty trie implementation that never contains anything and never accepts new entries.
 *
 * @param  the entry type
 */
class EmptyTrie extends AbstractTrie
{
    @SuppressWarnings("rawtypes")
    private static final EmptyTrie SENSITIVE = new EmptyTrie<>(true);
    @SuppressWarnings("rawtypes")
    private static final EmptyTrie INSENSITIVE = new EmptyTrie<>(false);

    private EmptyTrie(boolean caseSensitive)
    {
        super(caseSensitive);
    }

    @SuppressWarnings("unchecked")
    public static  EmptyTrie instance(boolean caseSensitive)
    {
        return caseSensitive ? SENSITIVE : INSENSITIVE;
    }

    @Override
    public void clear()
    {
    }

    @Override
    public V get(String s)
    {
        return null;
    }

    @Override
    public V get(ByteBuffer b)
    {
        return null;
    }

    @Override
    public V get(String s, int offset, int len)
    {
        return null;
    }

    @Override
    public V get(ByteBuffer b, int offset, int len)
    {
        return null;
    }

    @Override
    public V getBest(String s)
    {
        return null;
    }

    @Override
    public V getBest(byte[] b, int offset, int len)
    {
        return null;
    }

    @Override
    public V getBest(ByteBuffer b)
    {
        return null;
    }

    @Override
    public V getBest(byte[] b)
    {
        return null;
    }

    @Override
    public V getBest(String s, int offset, int len)
    {
        return null;
    }

    @Override
    public V getBest(ByteBuffer b, int offset, int len)
    {
        return null;
    }

    @Override
    public boolean isEmpty()
    {
        return true;
    }

    @Override
    public Set keySet()
    {
        return Collections.emptySet();
    }

    @Override
    public boolean put(V v)
    {
        Objects.requireNonNull(v);
        return false;
    }

    @Override
    public boolean put(String s, V v)
    {
        Objects.requireNonNull(s);
        return false;
    }

    @Override
    public int size()
    {
        return 0;
    }

    @Override
    protected boolean putAll(Map contents)
    {
        return false;
    }
}