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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *  http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.any23.extractor.xpath;
    19
    20  import org.eclipse.rdf4j.model.Resource;
    21  import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
    22
    23  /**
    24   * Represents a <i>Quad</i> subject <i>template</i>.
    25   *
    26   * @author Michele Mostarda (mostarda@fbk.eu)
    27   */
    28  public class TemplateSubject extends Term<Resource> {
    29
    30      /**
    31       * Supported subject types.
    32       */
    33      public enum Type {
    34          URI, BNODE
    35      }
    36
    37      /**
    38       * Instance subject type.
    39       */
    40      private final Type type;
    41
    42      /**
    43       * Constructor.
    44       *
    45       * @param type
    46       *            subject type.
    47       * @param value
    48       *            internal value.
    49       * @param isVar
    50       *            if <code>true</code> it the given <code>value</code> will be resolved with the variable value.
    51       */
    52      public TemplateSubject(Type type, String value, boolean isVar) {
    53          super(value, isVar);
    54          if (type == null) {
    55              throw new NullPointerException("object type cannot be null.");
    56          }
    57          this.type = type;
    58      }
    59
    60      @Override
    61      protected Resource getValueInternal(String value) {
    62          switch (type) {
    63          case URI:
    64              return SimpleValueFactory.getInstance().createIRI(value);
    65          case BNODE:
    66              return SimpleValueFactory.getInstance().createBNode(value);
    67          default:
    68              throw new IllegalStateException();
    69          }
    70      }
    71
    72      @Override
    73      public String toString() {
    74          final String superStr = super.toString();
    75          switch (type) {
    76          case URI:
    77              return "<" + superStr + ">";
    78          case BNODE:
    79              return "_:" + superStr;
    80          default:
    81              throw new IllegalStateException();
    82          }
    83      }
    84
    85  }