| /* |
| * 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.drill.common; |
| |
| import java.util.Arrays; |
| |
| /** |
| * Convenient way of obtaining and manipulating stack traces for debugging. |
| */ |
| public class StackTrace { |
| private final StackTraceElement[] stackTraceElements; |
| |
| /** |
| * Constructor. Captures the current stack trace. |
| */ |
| public StackTrace() { |
| // skip over the first element so that we don't include this constructor call |
| final StackTraceElement[] stack = Thread.currentThread().getStackTrace(); |
| stackTraceElements = Arrays.copyOfRange(stack, 1, stack.length - 1); |
| } |
| |
| /** |
| * 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) { |
| 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(); |
| } |
| } |