/*
    * 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.configuration2;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import java.io.File;
  import java.io.StringWriter;
  
  import org.apache.commons.configuration2.ex.ConfigurationException;
  import org.apache.commons.configuration2.io.FileHandler;
  import org.apache.commons.configuration2.tree.ImmutableNode;
  import org.apache.commons.configuration2.tree.xpath.XPathExpressionEngine;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Unit test for simple MultiConfigurationTest.
   */
  public class TestPatternSubtreeConfiguration {
      private static final File CONFIG_FILE = ConfigurationAssert.getTestFile("testPatternSubtreeConfig.xml");
      private static final String PATTERN = "BusinessClient[@name='${sys:Id}']";
      private XMLConfiguration conf;
  
      @BeforeEach
      public void setUp() throws Exception {
          conf = new XMLConfiguration();
          new FileHandler(conf).load(CONFIG_FILE);
      }
  
      /**
       * Rigorous Test :-)
       */
      @Test
      public void testMultiConfiguration() {
          final PatternSubtreeConfigurationWrapper config = new PatternSubtreeConfigurationWrapper(this.conf, PATTERN);
          config.setExpressionEngine(new XPathExpressionEngine());
  
          System.setProperty("Id", "1001");
          assertEquals(15, config.getInt("rowsPerPage"));
  
          System.setProperty("Id", "1002");
          assertEquals(25, config.getInt("rowsPerPage"));
  
          System.setProperty("Id", "1003");
          assertEquals(35, config.getInt("rowsPerPage"));
      }
  
      /**
       * Tests a read operation if the wrapped configuration does not implement FileBased.
       */
      @Test
      public void testReadNotFileBased() {
          final HierarchicalConfiguration<ImmutableNode> hc = new BaseHierarchicalConfiguration();
          final PatternSubtreeConfigurationWrapper config = new PatternSubtreeConfigurationWrapper(hc, PATTERN);
          final FileHandler fileHandler = new FileHandler(config);
          assertThrows(ConfigurationException.class, () -> fileHandler.load(CONFIG_FILE));
      }
  
      /**
       * Tests a write operation if the wrapped configuration does not implement FileBased.
       */
      @Test
      public void testSaveNotFileBased() {
          final HierarchicalConfiguration<ImmutableNode> hc = new BaseHierarchicalConfiguration();
          final PatternSubtreeConfigurationWrapper config = new PatternSubtreeConfigurationWrapper(hc, PATTERN);
          final FileHandler fileHandler = new FileHandler(config);
          final StringWriter writer = new StringWriter();
          assertThrows(ConfigurationException.class, () -> fileHandler.save(writer));
      }
  }