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 /* ObjectSwap */
042   public String swap(BeanSession session, StackTraceElement o) {
043      return o.toString();
044   }
045
046   @Override /* ObjectSwap */
047   public StackTraceElement unswap(BeanSession session, String in, ClassMeta<?> hint) {
048      String methodName = "", fileName = null;
049      int lineNumber = -1;
050
051      if (in == null)
052         return null;
053
054      int i = in.indexOf('(');
055      if (i != -1) {
056         String s = in.substring(i+1, in.lastIndexOf(')'));
057         in = in.substring(0, i);
058         i = s.indexOf(':');
059         if (i != -1) {
060            fileName = s.substring(0, i);
061            lineNumber = Integer.parseInt(s.substring(i+1));
062         } else if ("Native Method".equals(s)) {
063            lineNumber = -2;
064         } else if (! "Unknown Source".equals(s)) {
065            fileName = s;
066         }
067      }
068
069      i = in.lastIndexOf('.');
070      if (i != -1) {
071         methodName = in.substring(i+1);
072         in = in.substring(0, i);
073      }
074
075      return new StackTraceElement(in, methodName, fileName, lineNumber);
076   }
077}