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Java example source code file (SchemeRegistry.java)

This example source code file (SchemeRegistry.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

guardedby, host, illegalargumentexception, illegalstateexception, linkedhashmap, list, map, name, scheme, schemeregistry, threadsafe, util

The SchemeRegistry.java example source code

/*
 * ====================================================================
 * 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
 * <http://www.apache.org/>.
 *
 */
package org.apache.http.conn.scheme;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.http.annotation.GuardedBy;
import org.apache.http.annotation.ThreadSafe;

import org.apache.http.HttpHost;

/**
 * A set of supported protocol {@link Scheme}s.
 * Schemes are identified by lowercase names.
 *
 * @since 4.0
 */
@ThreadSafe
public final class SchemeRegistry {

    /** The available schemes in this registry. */
    @GuardedBy("this")
    private final Map<String,Scheme> registeredSchemes;

    /**
     * Creates a new, empty scheme registry.
     */
    public SchemeRegistry() {
        super();
        registeredSchemes = new LinkedHashMap<String,Scheme>();
    }

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

    /**
     * Obtains the scheme for a host.
     * Convenience method for <code>getScheme(host.getSchemeName())
* * @param host the host for which to obtain the scheme * * @return the scheme for the given host, never <code>null * * @throws IllegalStateException * if a scheme with the respective name is not registered */ public synchronized final Scheme 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 * <code>null if there is none by this name */ public synchronized final Scheme 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(); Scheme 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 * <code>null if none was registered */ public synchronized final Scheme register(Scheme sch) { if (sch == null) throw new IllegalArgumentException("Scheme must not be null."); Scheme 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 * <code>null if there was none */ public synchronized final Scheme 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(); Scheme gone = registeredSchemes.remove(name); return gone; } /** * Obtains the names of the registered schemes in their default order. * * @return List containing registered scheme names. */ public synchronized final List<String> getSchemeNames() { return new ArrayList<String>(registeredSchemes.keySet()); } /** * Populates the internal collection of registered {@link Scheme protocol schemes} * with the content of the map passed as a parameter. * * @param map protocol schemes */ public synchronized void setItems(final Map<String, Scheme> map) { if (map == null) { return; } registeredSchemes.clear(); registeredSchemes.putAll(map); } }

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