content: /*
   * 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.calcite.avatica;
  
  import org.apache.calcite.avatica.util.ArrayImpl;
  import org.apache.calcite.avatica.util.Cursor;
  
  import org.hamcrest.Matcher;
  
  import java.util.List;
  import java.util.function.BiPredicate;
  
  /**
   * Custom Hamcrest matchers for the Avatica project.
   */
  public class AvaticaMatchers {
  
    private static final double DELTA = 1e-15;
  
    private AvaticaMatchers() {
      // private constructor
    }
  
    /**
     * Creates a matcher that matches if the result set of the examined accessor
     * ({@link org.apache.calcite.avatica.util.AbstractCursor.ArrayAccessor}) is logically equal to
     * the specified values.
     *
     * Equality between individual elements is usually determined by {@link Object#equals(Object)} but
     * it can be more permissive when comparing approximate numbers (e.g., Float, Double) to account
     * for some margin of error.
     */
    public static Matcher<Cursor.Accessor> isArrayAccessorResult(List<Object> value, Class<?> type) {
      BiPredicate<Object, Object> comparisonPredicate = Object::equals;
      if (Float.class.equals(type)) {
        comparisonPredicate = (f1, f2) -> Math.abs((float) f1 - (float) f2) <= DELTA;
      } else if (Double.class.equals(type)) {
        comparisonPredicate = (d1, d2) -> Math.abs((double) d1 - (double) d2) <= DELTA;
      } else if (ArrayImpl.class.equals(type)) {
        comparisonPredicate = (a1, a2) -> a1.toString().equals(a2.toString());
      }
      return new IsArrayAccessorResultSetEqual(value, comparisonPredicate);
    }
  }
  
  // End AvaticaMatchers.java
  