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.transforms;
014
015import java.util.*;
016
017import org.apache.juneau.*;
018import org.apache.juneau.transform.*;
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 */
027public class StackTraceElementSwap extends PojoSwap<StackTraceElement,String> {
028
029   /**
030    * Converts the specified {@link Enumeration} to a {@link List}.
031    */
032   @Override /* PojoSwap */
033   public String swap(BeanSession session, StackTraceElement o) {
034      return o.toString();
035   }
036
037   @Override /* PojoSwap */
038   public StackTraceElement unswap(BeanSession session, String in, ClassMeta<?> hint) {
039      String methodName = "", fileName = null;
040      int lineNumber = -1;
041
042      if (in == null)
043         return null;
044
045      int i = in.indexOf('(');
046      if (i != -1) {
047         String s = in.substring(i+1, in.lastIndexOf(')'));
048         in = in.substring(0, i);
049         i = s.indexOf(':');
050         if (i != -1) {
051            fileName = s.substring(0, i);
052            lineNumber = Integer.parseInt(s.substring(i+1));
053         } else if ("Native Method".equals(s)) {
054            lineNumber = -2;
055         } else if (! "Unknown Source".equals(s)) {
056            fileName = s;
057         }
058      }
059
060      i = in.lastIndexOf('.');
061      if (i != -1) {
062         methodName = in.substring(i+1);
063         in = in.substring(0, i);
064      }
065
066      return new StackTraceElement(in, methodName, fileName, lineNumber);
067   }
068}