/*
    * Copyright 2001-2008 The Apache Software Foundation.
    * 
    * Licensed 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.
   *
   */
  
  package org.apache.juddi.keygen;
  
  import java.util.Iterator;
  import java.util.List;
  import java.util.UUID;
  
  import org.apache.commons.configuration.ConfigurationException;
  import org.apache.juddi.config.AppConfig;
  import org.apache.juddi.config.Property;
  import org.apache.juddi.model.UddiEntityPublisher;
  import org.apache.juddi.v3.client.UDDIConstants;
  import org.apache.juddi.v3.error.ErrorMessage;
  import org.apache.juddi.v3.error.FatalErrorException;
  import org.uddi.v3_service.DispositionReportFaultMessage;
  
  /**
   * The default jUDDI key generator.  Generates a key like this:
   * 
   * uddiScheme : domain : UUID
   * 
   * where domain is the shortest keyGenerator domain. 
   * 
   * If no domain is set for this publihser, or the publisher is 'uddi' then
   * it defaults to the RootDomain:
   * 
   * uddiScheme : RootDomain : UUID
   * 
   * @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
   */
  public class DefaultKeyGenerator implements KeyGenerator {
  
  	public String generate(UddiEntityPublisher publisher) throws DispositionReportFaultMessage {
  		String domain = getDomain(publisher);
  		if (domain==null) {
  			String rootPartition = "";
  			try 
  			{ rootPartition = AppConfig.getConfiguration().getString(Property.JUDDI_ROOT_PARTITION); }
  			catch(ConfigurationException ce) 
  			{ throw new FatalErrorException(new ErrorMessage("errors.configuration.Retrieval", Property.JUDDI_ROOT_PARTITION));}
  			domain = rootPartition;
  		}
  		return domain + PARTITION_SEPARATOR + UUID.randomUUID();
  	}
  	
  	public static String getDomain(UddiEntityPublisher publisher) {
  		String domain = null;
  		if (publisher==null || "uddi".equalsIgnoreCase(publisher.getAuthorizedName())) return domain; //default to the rootPartition
  		List<String> domains = publisher.getKeyGeneratorKeys();
  		if (domains!=null && !domains.isEmpty()) {
  			Iterator<String> iter = domains.iterator();
  			int partsMax = 1000;
  			//pick the KeyGenerator with the fewest amount of parts, ignoring the subdomain keys. 
  			while (iter.hasNext()) {
  				String thisDomain = iter.next();
  				String[] parts = thisDomain.split(":");
  				if ((domain == null || (2 <= parts.length && parts.length < partsMax)) && thisDomain.length() + 37 < 255) {
  					partsMax = parts.length;
  					domain = thisDomain;
  				}
  			}
  			domain = domain.substring(0, domain.lastIndexOf(":"));
  		}
  		return domain;
  	}
  
  }