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    1   /*
    2    * Copyright 1999-2004 The Apache Software Foundation
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License");
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  package org.apache.commons.jxpath;
    17
    18  /***
    19   * Thrown in various situations by JXPath; may contain a nested exception.
    20   *
    21   * @author Dmitri Plotnikov
    22   * @version $Revision: 1.5 $ $Date: 2004/02/29 14:17:42 $
    23   */
    24
    25  public class JXPathException extends RuntimeException {
    26
    27      /*** @serial */
    28      private Throwable exception;
    29
    30      /***
    31       * Create a new <code>JXPathException</code> with no
    32       * detail mesage.
    33       */
    34
    35       public JXPathException() {
    36           super();
    37           this.exception = null;
    38       }
    39
    40      /***
    41       * Create a new <code>JXPathException</code> with
    42       * the <code>String </code> specified as an error message.
    43       *
    44       * @param msg The error message for the exception.
    45       */
    46      public JXPathException(String msg) {
    47          super(msg);
    48          this.exception = null;
    49      }
    50
    51
    52      /***
    53       * Create a new <code>JXPathException</code> with a
    54       * given <code>Throwable</code> base cause of the error.
    55       *
    56       * @param e The exception to be encapsulated in a
    57       * JXPathException.
    58       */
    59      public JXPathException(Throwable e) {
    60          super(e.toString());
    61          this.exception = e;
    62      }
    63
    64      /***
    65       * Create a new <code>JXPathException</code> with the
    66       * given <code>Exception</code> base cause and detail message.
    67       *
    68       * @param e The exception to be encapsulated in a
    69       * JXPathException
    70       * @param msg The detail message.
    71       */
    72      public JXPathException(String msg, Throwable e) {
    73          super(msg);
    74          this.exception = e;
    75      }
    76
    77
    78      /***
    79       * Return the message (if any) for this error . If there is no
    80       * message for the exception and there is an encapsulated
    81       * exception then the message of that exception will be returned.
    82       *
    83       * @return The error message.
    84       */
    85      public String getMessage() {
    86          String message = super.getMessage();
    87
    88          if (exception != null) {
    89              if (message == null) {
    90                  if (exception.getMessage() != null) {
    91                      return exception.getMessage();
    92                  }
    93                  else {
    94                      return exception.getClass().getName();
    95                  }
    96              }
    97              else {
    98                  if (exception.getMessage() != null) {
    99                      return message + "; " + exception.getMessage();
    100                 }
    101                 else {
    102                     return message + "; " + exception.getClass().getName();
    103                 }
    104             }
    105         }
    106
    107         return message;
    108     }
    109
    110     /***
    111      * Return the actual exception (if any) that caused this exception to
    112      * be raised.
    113      *
    114      * @return The encapsulated exception, or null if there is none.
    115      */
    116     public Throwable getException() {
    117         return exception;
    118     }
    119 }