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// 
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// 
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// 
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// 
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
// 
package org.eclipse.jetty.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.jetty.util.component.Dumpable;

// @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
@Deprecated(since = "2021-05-27")
public class AttributesMap implements Attributes, Dumpable {

    private final AtomicReference> _map = new AtomicReference<>();

    public AttributesMap() {
    }

    public AttributesMap(AttributesMap attributes) {
        ConcurrentMap map = attributes.map();
        if (map != null)
            _map.set(new ConcurrentHashMap<>(map));
    }

    private ConcurrentMap map() {
        return _map.get();
    }

    private ConcurrentMap ensureMap() {
        while (true) {
            ConcurrentMap map = map();
            if (map != null)
                return map;
            map = new ConcurrentHashMap<>();
            if (_map.compareAndSet(null, map))
                return map;
        }
    }

    @Override
    public void removeAttribute(String name) {
        Map map = map();
        if (map != null)
            map.remove(name);
    }

    @Override
    public void setAttribute(String name, Object attribute) {
        if (attribute == null)
            removeAttribute(name);
        else
            ensureMap().put(name, attribute);
    }

    @Override
    public Object getAttribute(String name) {
        Map map = map();
        return map == null ? null : map.get(name);
    }

    @Override
    public Enumeration getAttributeNames() {
        return Collections.enumeration(getAttributeNameSet());
    }

    @Override
    public Set getAttributeNameSet() {
        return keySet();
    }

    public Set> getAttributeEntrySet() {
        Map map = map();
        return map == null ? Collections.emptySet() : map.entrySet();
    }

    public static Enumeration getAttributeNamesCopy(Attributes attrs) {
        if (attrs instanceof AttributesMap)
            return Collections.enumeration(((AttributesMap) attrs).keySet());
        List names = new ArrayList<>(Collections.list(attrs.getAttributeNames()));
        return Collections.enumeration(names);
    }

    @Override
    public void clearAttributes() {
        Map map = map();
        if (map != null)
            map.clear();
    }

    public int size() {
        Map map = map();
        return map == null ? 0 : map.size();
    }

    @Override
    public String toString() {
        Map map = map();
        return map == null ? "{}" : map.toString();
    }

    private Set keySet() {
        Map map = map();
        return map == null ? Collections.emptySet() : map.keySet();
    }

    public void addAll(Attributes attributes) {
        Enumeration e = attributes.getAttributeNames();
        while (e.hasMoreElements()) {
            String name = e.nextElement();
            setAttribute(name, attributes.getAttribute(name));
        }
    }

    @Override
    public String dump() {
        return Dumpable.dump(this);
    }

    @Override
    public void dump(Appendable out, String indent) throws IOException {
        Dumpable.dumpObjects(out, indent, String.format("%s@%x", this.getClass().getSimpleName(), hashCode()), map());
    }
}