/*

  * 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.any23.extractor.xpath;

 import org.openrdf.model.Resource;

 import org.openrdf.model.impl.BNodeImpl;

 import org.openrdf.model.impl.URIImpl;

 /**

  * Represents a <i>Quad</i> subject <i>template</i>.

  *

  * @author Michele Mostarda (mostarda@fbk.eu)

  */

 public class TemplateSubject extends Term<Resource> {

     /**

      * Supported subject types.

      */

     public enum Type {

         uri,

         bnode

     }

     /**

      * Instance subject type.

      */

     private final Type type;

     /**

      * Constructor.

      *

      * @param type subject type.

      * @param value internal value.

      * @param isVar if <code>true</code> it the given <code>value</code>

      *              will be resolved with the variable value.

      */

     public TemplateSubject(Type type, String value, boolean isVar) {

         super(value, isVar);

         if (type == null) {

             throw new NullPointerException("object type cannot be null.");

         }

         this.type = type;

     }

     @Override

     protected Resource getValueInternal(String value) {

         switch (type) {

             case uri:

                 return new URIImpl(value);

             case bnode:

                 return new BNodeImpl(value);

             default:

                 throw new IllegalStateException();

         }

     }

     @Override

     public String toString() {

         final String superStr = super.toString();

         switch (type) {

             case uri:

                 return "<" + superStr + ">";

             case bnode:

                 return "_:" + superStr;

             default:

                 throw new IllegalStateException();

         }

     }

 }