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.util;
  
  import java.util.Arrays;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** Convenient way of obtaining and manipulating stack traces for debugging. */
  public class StackTrace {
  
    private final @Nullable StackTraceElement[] stackTraceElements;
  
    /** Constructor. Captures the current stack trace. */
    public StackTrace() {
      final StackTraceElement[] stack = Thread.currentThread().getStackTrace();
      // Skip first two elements to remove getStackTrace/StackTrace.<init>
      stackTraceElements = Arrays.copyOfRange(stack, 2, stack.length);
    }
  
    /**
     * Write the stack trace to a StringBuilder.
     *
     * @param sb where to write it
     * @param indent how many double spaces to indent each line
     */
    public void writeToBuilder(final StringBuilder sb, final int indent) {
      // create the indentation string
      final char[] indentation = new char[indent * 2];
      Arrays.fill(indentation, ' ');
  
      // write the stack trace in standard Java format
      for (StackTraceElement ste : stackTraceElements) {
        if (ste != null) {
          sb.append(indentation)
              .append("at ")
              .append(ste.getClassName())
              .append('.')
              .append(ste.getMethodName())
              .append('(')
              .append(ste.getFileName())
              .append(':')
              .append(Integer.toString(ste.getLineNumber()))
              .append(")\n");
        }
      }
    }
  
    @Override
    public String toString() {
      final StringBuilder sb = new StringBuilder();
      writeToBuilder(sb, 0);
      return sb.toString();
    }
  }
  