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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.util.Collections;
import java.util.Enumeration;
import java.util.Set;

/**
 *  Attributes.
 *  Interface commonly used for storing attributes.
 *
 * @deprecated The Eclipse Jetty and Apache Felix Http Jetty packages are no longer supported.
 */
@Deprecated(since = "2021-05-27")
public interface Attributes {

    void removeAttribute(String name);

    void setAttribute(String name, Object attribute);

    Object getAttribute(String name);

    Set getAttributeNameSet();

    default Enumeration getAttributeNames() {
        return Collections.enumeration(getAttributeNameSet());
    }

    void clearAttributes();

    static Attributes unwrap(Attributes attributes) {
        while (attributes instanceof Wrapper) {
            attributes = ((Wrapper) attributes).getAttributes();
        }
        return attributes;
    }

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

        protected final Attributes _attributes;

        public Wrapper(Attributes attributes) {
            _attributes = attributes;
        }

        public Attributes getAttributes() {
            return _attributes;
        }

        @Override
        public void removeAttribute(String name) {
            _attributes.removeAttribute(name);
        }

        @Override
        public void setAttribute(String name, Object attribute) {
            _attributes.setAttribute(name, attribute);
        }

        @Override
        public Object getAttribute(String name) {
            return _attributes.getAttribute(name);
        }

        @Override
        public Set getAttributeNameSet() {
            return _attributes.getAttributeNameSet();
        }

        @Override
        public void clearAttributes() {
            _attributes.clearAttributes();
        }
    }
}