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.arrow.memory;
  
  /**
   * Configuration class to determine if bounds checking should be turned on or off.
   *
   * <p>Bounds checking is on by default. You can disable it by setting either the system property or
   * the environmental variable to "true". The system property can be
   * "arrow.enable_unsafe_memory_access" or "drill.enable_unsafe_memory_access". The latter is
   * deprecated. The environmental variable is named "ARROW_ENABLE_UNSAFE_MEMORY_ACCESS". When both
   * the system property and the environmental variable are set, the system property takes precedence.
   */
  public class BoundsChecking {
  
    public static final boolean BOUNDS_CHECKING_ENABLED;
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(BoundsChecking.class);
  
    static {
      String envProperty = System.getenv("ARROW_ENABLE_UNSAFE_MEMORY_ACCESS");
      String oldProperty = System.getProperty("drill.enable_unsafe_memory_access");
      if (oldProperty != null) {
        logger.warn(
            "\"drill.enable_unsafe_memory_access\" has been renamed to \"arrow.enable_unsafe_memory_access\"");
        logger.warn(
            "\"arrow.enable_unsafe_memory_access\" can be set to: "
                + " true (to not check) or false (to check, default)");
      }
      String newProperty = System.getProperty("arrow.enable_unsafe_memory_access");
  
      // The priority of determining the unsafe flag:
      // 1. The system properties take precedence over the environmental variable.
      // 2. The new system property takes precedence over the new system property.
      String unsafeFlagValue = newProperty;
      if (unsafeFlagValue == null) {
        unsafeFlagValue = oldProperty;
      }
      if (unsafeFlagValue == null) {
        unsafeFlagValue = envProperty;
      }
  
      BOUNDS_CHECKING_ENABLED = !"true".equals(unsafeFlagValue);
    }
  
    private BoundsChecking() {}
  }
  