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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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */
package org.apache.http.nio.conn.scheme;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.http.HttpHost;

/**
 * A set of supported protocol {@link AsyncScheme}s.
 * Schemes are identified by lowercase names.
 *
 */
public final class AsyncSchemeRegistry {

    /** The available schemes in this registry. */
    private final Map registeredSchemes;

    /**
     * Creates a new, empty scheme registry.
     */
    public AsyncSchemeRegistry() {
        super();
        registeredSchemes = new ConcurrentHashMap();
    }

    /**
     * Obtains a scheme by name.
     *
     * @param name      the name of the scheme to look up (in lowercase)
     *
     * @return  the scheme, never null
     *
     * @throws IllegalStateException
     *          if the scheme with the given name is not registered
     */
    public final AsyncScheme getScheme(String name) {
        AsyncScheme found = get(name);
        if (found == null) {
            throw new IllegalStateException
                ("Scheme '"+name+"' not registered.");
        }
        return found;
    }

    /**
     * Obtains the scheme for a host.
     * Convenience method for getScheme(host.getSchemeName())
* * @param host the host for which to obtain the scheme * * @return the scheme for the given host, never null * * @throws IllegalStateException * if a scheme with the respective name is not registered */ public final AsyncScheme getScheme(HttpHost host) { if (host == null) { throw new IllegalArgumentException("Host must not be null."); } return getScheme(host.getSchemeName()); } /** * Obtains a scheme by name, if registered. * * @param name the name of the scheme to look up (in lowercase) * * @return the scheme, or * null if there is none by this name */ public final AsyncScheme get(String name) { if (name == null) throw new IllegalArgumentException("Name must not be null."); // leave it to the caller to use the correct name - all lowercase //name = name.toLowerCase(); AsyncScheme found = registeredSchemes.get(name); return found; } /** * Registers a scheme. * The scheme can later be retrieved by its name * using {@link #getScheme(String) getScheme} or {@link #get get}. * * @param sch the scheme to register * * @return the scheme previously registered with that name, or * null if none was registered */ public final AsyncScheme register(AsyncScheme sch) { if (sch == null) throw new IllegalArgumentException("Scheme must not be null."); AsyncScheme old = registeredSchemes.put(sch.getName(), sch); return old; } /** * Unregisters a scheme. * * @param name the name of the scheme to unregister (in lowercase) * * @return the unregistered scheme, or * null if there was none */ public final AsyncScheme unregister(String name) { if (name == null) throw new IllegalArgumentException("Name must not be null."); // leave it to the caller to use the correct name - all lowercase //name = name.toLowerCase(); AsyncScheme gone = registeredSchemes.remove(name); return gone; } /** * Obtains the names of the registered schemes. * * @return List containing registered scheme names. */ public final List getSchemeNames() { return new ArrayList(registeredSchemes.keySet()); } /** * Populates the internal collection of registered {@link AsyncScheme protocol schemes} * with the content of the map passed as a parameter. * * @param map protocol schemes */ public void setItems(final Map map) { if (map == null) { return; } registeredSchemes.clear(); registeredSchemes.putAll(map); } }



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