code: package it.unibz.inf.ontop.spec.mapping.impl;
  
  /*
   * #%L
   * ontop-obdalib-core
   * %%
   * Copyright (C) 2009 - 2014 Free University of Bozen-Bolzano
   * %%
   * 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.
   * #L%
   */
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.ImmutableMap;
  import com.google.inject.Inject;
  import com.google.inject.assistedinject.Assisted;
  import it.unibz.inf.ontop.model.vocabulary.*;
  import it.unibz.inf.ontop.utils.ImmutableCollectors;
  
  import java.util.*;
  import java.util.stream.Stream;
  
  public class SimplePrefixManager extends AbstractPrefixManager {
  
  	private final ImmutableMap<String, String> prefixToIriMap;
  
      @Inject
  	private SimplePrefixManager(@Assisted ImmutableMap<String, String> prefixToIriMap) {
      	if (prefixToIriMap.containsValue(null))
  			throw new NullPointerException("Prefix name must not be null");
  
      	if (!prefixToIriMap.keySet().stream().allMatch(p -> p.endsWith(":")))
  			throw new IllegalArgumentException("Prefix names must end with a colon (:)");
  
          this.prefixToIriMap = Stream.concat(
          			prefixToIriMap.entrySet().stream(),
  					standardIriPrefixes.entrySet().stream())
  				.distinct()
  				.collect(ImmutableCollectors.toMap());
  	}
  
      private static final ImmutableMap<String, String> standardIriPrefixes = ImmutableMap.of(
          		OntopInternal.PREFIX_RDF, RDF.PREFIX,
          		OntopInternal.PREFIX_RDFS, RDFS.PREFIX,
          		OntopInternal.PREFIX_OWL, OWL.PREFIX,
          		OntopInternal.PREFIX_XSD, XSD.PREFIX,
          		OntopInternal.PREFIX_OBDA, Ontop.PREFIX);
  
  	/**
  	 * Returns the corresponding IRI definition for the given prefix
  	 * 
  	 * @param prefix
  	 *            the prefix name
  	 * @return the corresponding IRI definition or null if the prefix is not
  	 *         registered
  	 */
      @Override
  	protected Optional<String> getIriDefinition(String prefix) {
  		return Optional.ofNullable(prefixToIriMap.get(prefix));
  	}
  
  	private List<Map.Entry<String, String>> orderedMap; // lazy instantiation
  
  	@Override
  	protected List<Map.Entry<String, String>> getOrderedMap() {
  		if (orderedMap == null)
  			orderedMap = orderMap(prefixToIriMap);
  		return orderedMap;
  	}
  
  	/**
  	 * Returns a map with all registered prefixes and the corresponding IRI
  	 * 
  	 * @return an immutable map
  	 */
      @Override
  	public Map<String, String> getPrefixMap() {
  		return prefixToIriMap;
  	}
  }
  