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Core barcode encoding/decoding library

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/*
 * Copyright 2007 ZXing authors
 *
 * Licensed 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 com.google.zxing;

/**
 * The general exception class throw when something goes wrong during decoding of a barcode.
 * This includes, but is not limited to, failing checksums / error correction algorithms, being
 * unable to locate finder timing patterns, and so on.
 *
 * @author Sean Owen
 */
public abstract class ReaderException extends Exception {

  // disable stack traces when not running inside test units
  protected static boolean isStackTrace =
      System.getProperty("surefire.test.class.path") != null;
  protected static final StackTraceElement[] NO_TRACE = new StackTraceElement[0];

  ReaderException() {
    // do nothing
  }

  ReaderException(Throwable cause) {
    super(cause);
  }

  // Prevent stack traces from being taken
  @Override
  public final synchronized Throwable fillInStackTrace() {
    return null;
  }

  /**
   * For testing only. Controls whether library exception classes include stack traces or not.
   * Defaults to false, unless running in the project's unit testing harness.
   *
   * @param enabled if true, enables stack traces in library exception classes
   * @since 3.5.0
   */
  public static void setStackTrace(boolean enabled) {
    isStackTrace = enabled;
  }

}