org.apache.abdera.i18n.iri.SchemeRegistry Maven / Gradle / Ivy

Go to download
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  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.  For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
*/
package org.apache.abdera.i18n.iri;

import java.util.HashMap;
import java.util.Map;

/**
 * Static registry of custom IRI schemes.
 */
public final class SchemeRegistry {

  private static SchemeRegistry registry;
  
  public static synchronized SchemeRegistry getInstance() {
    if (registry == null) registry = new SchemeRegistry();
    return registry;
  }
  
  private final Map schemes;
  
  SchemeRegistry() {
    schemes = new HashMap();
    schemes.put(HttpScheme.NAME, new HttpScheme());
    schemes.put(HttpsScheme.NAME, new HttpsScheme());
    schemes.put(FtpScheme.NAME, new FtpScheme());
  }
  
  @SuppressWarnings("unchecked")
  public synchronized boolean register(
    String schemeClass) 
      throws ClassNotFoundException, 
             IllegalAccessException, 
             InstantiationException {
    Class klass = 
      (Class) Thread.currentThread()
        .getContextClassLoader().loadClass(schemeClass);
    return register(klass);
  }
  
  public synchronized boolean register(
    Class schemeClass) 
      throws IllegalAccessException, 
             InstantiationException {
    Scheme scheme = schemeClass.newInstance();
    return register(scheme);
  }
  
  public synchronized boolean register(Scheme scheme) {
    String name = scheme.getName();
    if (schemes.get(name) == null) {
      schemes.put(name.toLowerCase(), scheme);
      return true;
    } else return false;
  }
  
  public Scheme getScheme(String scheme) {
    if (scheme == null) return null;
    Scheme s = schemes.get(scheme.toLowerCase());
    return (s != null) ? s : new DefaultScheme(scheme);
  }
  
}