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