001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.swaps;
018
019import java.util.*;
020
021import org.apache.juneau.*;
022import org.apache.juneau.swap.*;
023
024/**
025 * Transforms {@link StackTraceElement StackTraceElements} to {@code String} objects.
026 *
027 * <p>
028 * The swap is identical to just calling {@link StackTraceElement#toString()}, but provides the ability to
029 * parse the resulting string back into a bean.
030 *
031 * <h5 class='section'>See Also:</h5><ul>
032 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/SwapBasics">Swap Basics</a>
033
034 * </ul>
035 */
036public class StackTraceElementSwap extends ObjectSwap<StackTraceElement,String> {
037
038   /**
039    * Converts the specified {@link Enumeration} to a {@link List}.
040    */
041   @Override /* Overridden from ObjectSwap */
042   public String swap(BeanSession session, StackTraceElement o) {
043      return o.toString();
044   }
045
046   @Override /* Overridden from ObjectSwap */
047   public StackTraceElement unswap(BeanSession session, String in, ClassMeta<?> hint) {
048      var methodName = "";
049      var fileName = (String)null;
050      int lineNumber = -1;
051
052      if (in == null)
053         return null;
054
055      var i = in.indexOf('(');
056      if (i != -1) {
057         var s = in.substring(i + 1, in.lastIndexOf(')'));
058         in = in.substring(0, i);
059         i = s.indexOf(':');
060         if (i != -1) {
061            fileName = s.substring(0, i);
062            lineNumber = Integer.parseInt(s.substring(i + 1));
063         } else if ("Native Method".equals(s)) {
064            lineNumber = -2;
065         } else if (! "Unknown Source".equals(s)) {
066            fileName = s;
067         }
068      }
069
070      i = in.lastIndexOf('.');
071      if (i != -1) {
072         methodName = in.substring(i + 1);
073         in = in.substring(0, i);
074      }
075
076      return new StackTraceElement(in, methodName, fileName, lineNumber);
077   }
078}