/**
    * 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.
   */
  package org.apache.commons.rdf.simple;
  
  import java.util.UUID;
  
  import org.apache.commons.rdf.api.BlankNode;
  import org.apache.commons.rdf.api.BlankNodeOrIRI;
  import org.apache.commons.rdf.api.Dataset;
  import org.apache.commons.rdf.api.Graph;
  import org.apache.commons.rdf.api.IRI;
  import org.apache.commons.rdf.api.Literal;
  import org.apache.commons.rdf.api.Quad;
  import org.apache.commons.rdf.api.RDFTerm;
  import org.apache.commons.rdf.api.RDF;
  import org.apache.commons.rdf.api.Triple;
  
  /**
   * Simple RDF implementation.
   * <p>
   * The {@link RDFTerm}, {@link Triple}, {@link Quad}, {@link Graph} and
   * {@link Dataset} instances created by SimpleRDF are simple in-memory
   * Implementations that are not thread-safe or efficient, but which may be
   * useful for testing and prototyping purposes.
   */
  public class SimpleRDF implements RDF {
  
      /**
       * Marker interface to say that this RDFTerm is part of the Simple
       * implementation. Used by {@link GraphImpl} to avoid double remapping.
       * <p>
       * This method is package protected to avoid any third-party subclasses.
       *
       */
      static interface SimpleRDFTerm extends RDFTerm {
      }
  
      /**
       * Unique salt per instance, for {@link #createBlankNode(String)}
       */
      private final UUID SALT = UUID.randomUUID();
  
      @Override
      public BlankNode createBlankNode() {
          return new BlankNodeImpl();
      }
  
      @Override
      public BlankNode createBlankNode(final String name) {
          return new BlankNodeImpl(SALT, name);
      }
  
      @Override
      public Graph createGraph() {
          // Creates a GraphImpl object using this object as the factory for
          // delegating all object creation to
          return new GraphImpl(this);
      }
  
      @Override
      public Dataset createDataset() throws UnsupportedOperationException {
          return new DatasetImpl(this);
      }
  
      @Override
      public IRI createIRI(final String iri) {
          final IRI result = new IRIImpl(iri);
          // Reuse any IRI objects already created in Types
          return Types.get(result).orElse(result);
      }
  
      @Override
      public Literal createLiteral(final String literal) {
          return new LiteralImpl(literal);
      }
  
      @Override
      public Literal createLiteral(final String literal, final IRI dataType) {
          return new LiteralImpl(literal, dataType);
      }
  
      @Override
      public Literal createLiteral(final String literal, final String language) {
          return new LiteralImpl(literal, language);
     }
 
     @Override
     public Triple createTriple(final BlankNodeOrIRI subject, final IRI predicate, final RDFTerm object) {
         return new TripleImpl(subject, predicate, object);
     }
 
     @Override
     public Quad createQuad(final BlankNodeOrIRI graphName, final BlankNodeOrIRI subject, final IRI predicate, final RDFTerm object)
             throws IllegalArgumentException {
         return new QuadImpl(graphName, subject, predicate, object);
     }
 }