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.adapter.arrow;
  
  import org.apache.calcite.config.CalciteSystemProperty;
  
  import org.apache.arrow.gandiva.evaluator.Projector;
  import org.apache.arrow.gandiva.exceptions.GandivaException;
  import org.apache.arrow.gandiva.expression.ExpressionTree;
  import org.apache.arrow.vector.types.pojo.Schema;
  
  import org.junit.jupiter.api.extension.ConditionEvaluationResult;
  import org.junit.jupiter.api.extension.ExecutionCondition;
  import org.junit.jupiter.api.extension.ExtensionContext;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * JUnit5 extension to handle Arrow tests.
   *
   * <p>Tests will be skipped if the Gandiva library cannot be loaded on the given platform.
   */
  class ArrowExtension implements ExecutionCondition {
  
    /**
     * Whether to run this test.
     *
     * <p>Enabled by default, unless explicitly disabled from command line
     * ({@code -Dcalcite.test.arrow=false}) or if Gandiva library, used to implement arrow
     * filtering/projection, cannot be loaded.
     *
     * @return {@code true} if the test is enabled and can run in the current environment,
     *         {@code false} otherwise
     */
    @Override public ConditionEvaluationResult evaluateExecutionCondition(
        final ExtensionContext context) {
  
      boolean enabled = CalciteSystemProperty.TEST_ARROW.value();
      try {
        Schema emptySchema = new Schema(new ArrayList<>(), null);
        List<ExpressionTree> expressions = new ArrayList<>();
        Projector.make(emptySchema, expressions);
      } catch (GandivaException e) {
        // this exception comes from using an empty expression,
        // but the JNI library was loaded properly
      } catch (UnsatisfiedLinkError e) {
        enabled = false;
      }
  
      if (enabled) {
        return ConditionEvaluationResult.enabled("Arrow tests enabled");
      } else {
        return ConditionEvaluationResult.disabled("Arrow tests disabled");
      }
    }
  }
  