/*
    * 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.tree.xpath;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertSame;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.util.Locale;
  
  import org.apache.commons.configuration2.tree.ImmutableNode;
  import org.apache.commons.configuration2.tree.InMemoryNodeModel;
  import org.apache.commons.configuration2.tree.QueryResult;
  import org.apache.commons.jxpath.ri.Compiler;
  import org.apache.commons.jxpath.ri.QName;
  import org.apache.commons.jxpath.ri.compiler.NodeTest;
  import org.apache.commons.jxpath.ri.compiler.NodeTypeTest;
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  /**
   * Test class for {@code ConfigurationAttributePointer}.
   */
  public class TestConfigurationAttributePointer {
      /** Constant for the name of the test attribute. */
      private static final String ATTR_NAME = "myAttr";
  
      /** Constant for the value of the test attribute. */
      private static final String ATTR_VALUE = "myValue";
  
      /** Stores the parent node pointer. */
      private ConfigurationNodePointer<ImmutableNode> parent;
  
      /** The attribute pointer to be tested. */
      private ConfigurationAttributePointer<ImmutableNode> pointer;
  
      @BeforeEach
      public void setUp() throws Exception {
          final ImmutableNode.Builder ndBuilder = new ImmutableNode.Builder();
          ndBuilder.name("parent").addAttribute(ATTR_NAME, ATTR_VALUE);
          final ImmutableNode nd = ndBuilder.create();
          parent = new ConfigurationNodePointer<>(nd, Locale.ENGLISH, new InMemoryNodeModel(nd).getNodeHandler());
          pointer = new ConfigurationAttributePointer<>(parent, ATTR_NAME);
      }
  
      /**
       * Tests querying an iterator for attributes. Result should be null.
       */
      @Test
      public void testAttributeIterator() {
          assertNull(pointer.attributeIterator(new QName(null, "test")));
      }
  
      /**
       * Tests querying an iterator for children. Result should be null.
       */
      @Test
      public void testChildIterator() {
          assertNull(pointer.childIterator(null, false, null));
      }
  
      /**
       * Tests querying the base value.
       */
      @Test
      public void testGetBaseValue() {
          assertEquals(ATTR_VALUE, pointer.getBaseValue());
      }
  
      /**
       * Tests querying the immediate node. Here a proxy for an attribute node should be returned.
       */
      @Test
      public void testGetImmediateNode() {
          final Object node = pointer.getImmediateNode();
          final QueryResult<?> proxy = assertInstanceOf(QueryResult.class, node);
          assertTrue(proxy.isAttributeResult());
          assertEquals(parent.getConfigurationNode(), proxy.getNode());
          assertEquals(ATTR_NAME, proxy.getAttributeName());
      }
  
     /**
      * Tests the length.
      */
     @Test
     public void testGetLength() {
         assertEquals(1, pointer.getLength());
     }
 
     /**
      * Tests querying the node name.
      */
     @Test
     public void testGetName() {
         final QName name = pointer.getName();
         assertEquals(ATTR_NAME, name.getName());
         assertNull(name.getPrefix());
     }
 
     /**
      * Tests whether the correct pointer is returned.
      */
     @Test
     public void testGetParentPointer() {
         assertSame(parent, pointer.getParentPointer());
     }
 
     /**
      * Tests querying the attribute's value.
      */
     @Test
     public void testGetValue() {
         assertEquals(ATTR_VALUE, pointer.getValue());
     }
 
     /**
      * Tests the attribute flag.
      */
     @Test
     public void testIsAttribute() {
         assertTrue(pointer.isAttribute());
     }
 
     /**
      * Tests the collection flag.
      */
     @Test
     public void testIsCollection() {
         assertFalse(pointer.isCollection());
     }
 
     /**
      * Tests the leaf flag.
      */
     @Test
     public void testIsLeaf() {
         assertTrue(pointer.isLeaf());
     }
 
     /**
      * Tries to set a new value.
      */
     @Test
     public void testSetValue() {
         assertThrows(UnsupportedOperationException.class, () -> pointer.setValue("newValue"));
     }
 
     /**
      * Tests the testNode() method.
      */
     @Test
     public void testTestNode() {
         NodeTest test = new NodeTypeTest(Compiler.NODE_TYPE_TEXT);
         assertTrue(pointer.testNode(test));
         test = new NodeTypeTest(Compiler.NODE_TYPE_COMMENT);
         assertFalse(pointer.testNode(test));
     }
 }