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    1   /*
    2    *
    3    *   Copyright 2005 The Apache Software Foundation.
    4    *
    5    *  Licensed under the Apache License, Version 2.0 (the "License");
    6    *  you may not use this file except in compliance with the License.
    7    *  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   *  Unless required by applicable law or agreed to in writing, software
    12   *  distributed under the License is distributed on an "AS IS" BASIS,
    13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   *  See the License for the specific language governing permissions and
    15   *  limitations under the License.
    16   *
    17   */
    18  package org.apache.commons.scxml.env;
    19
    20  import java.util.HashSet;
    21  import java.util.Iterator;
    22  import java.util.Map;
    23  import java.util.Set;
    24
    25  import org.apache.commons.logging.Log;
    26  import org.apache.commons.logging.LogFactory;
    27
    28  import org.apache.commons.scxml.ErrorReporter;
    29  import org.apache.commons.scxml.model.SCXML;
    30  import org.apache.commons.scxml.model.State;
    31  import org.apache.commons.scxml.model.Transition;
    32  import org.apache.commons.scxml.model.TransitionTarget;
    33
    34  /***
    35   * Custom error reporter that log execution errors.
    36   */
    37  public class SimpleErrorReporter implements ErrorReporter {
    38
    39      /*** Log. */
    40      private Log log = LogFactory.getLog(getClass());
    41
    42      /***
    43       * Constructor.
    44       */
    45      public SimpleErrorReporter() {
    46          super();
    47      }
    48
    49      /***
    50       * @see ErrorReporter#onError(String, String, Object)
    51       */
    52      public void onError(final String errorCode, final String errDetail,
    53              final Object errCtx) {
    54          //Note: the if-then-else below is based on the actual usage
    55          // (codebase search), it has to be kept up-to-date as the code changes
    56          String errCode = errorCode.intern();
    57          StringBuffer msg = new StringBuffer();
    58          msg.append(errCode).append(" (");
    59          msg.append(errDetail).append("): ");
    60          if (errCode == ErrorReporter.NO_INITIAL) {
    61              if (errCtx instanceof SCXML) {
    62                  //determineInitialStates
    63                  msg.append("<SCXML>");
    64              } else if (errCtx instanceof State) {
    65                  //determineInitialStates
    66                  //determineTargetStates
    67                  msg.append("State " + LogUtils.getTTPath((State) errCtx));
    68              }
    69          } else if (errCode == ErrorReporter.UNKNOWN_ACTION) {
    70              //executeActionList
    71              msg.append("Action: " + errCtx.getClass().getName());
    72          } else if (errCode == ErrorReporter.NON_DETERMINISTIC) {
    73              //filterTransitionSet
    74              msg.append(" [");
    75              if (errCtx instanceof HashSet) {
    76                  for (Iterator i = ((Set) errCtx).iterator(); i.hasNext();) {
    77                      Transition t = (Transition) i.next();
    78                      msg.append(LogUtils.transToString(t.getParent(),
    79                          t.getTarget(), t));
    80                      if (i.hasNext()) {
    81                          msg.append(", ");
    82                      }
    83                  }
    84              }
    85              msg.append(']');
    86          } else if (errCode == ErrorReporter.ILLEGAL_CONFIG) {
    87              //isLegalConfig
    88              if (errCtx instanceof Map.Entry) {
    89                  TransitionTarget tt = (TransitionTarget)
    90                      (((Map.Entry) errCtx).getKey());
    91                  Set vals = (Set) (((Map.Entry) errCtx).getValue());
    92                  msg.append(LogUtils.getTTPath(tt) + " : [");
    93                  for (Iterator i = vals.iterator(); i.hasNext();) {
    94                      TransitionTarget tx = (TransitionTarget) i.next();
    95                      msg.append(LogUtils.getTTPath(tx));
    96                      if (i.hasNext()) {
    97                          msg.append(", ");
    98                      }
    99                  }
    100                 msg.append(']');
    101             } else if (errCtx instanceof Set) {
    102                 Set vals = (Set) errCtx;
    103                 msg.append("<SCXML> : [");
    104                 for (Iterator i = vals.iterator(); i.hasNext();) {
    105                     TransitionTarget tx = (TransitionTarget) i.next();
    106                     msg.append(LogUtils.getTTPath(tx));
    107                     if (i.hasNext()) {
    108                         msg.append(", ");
    109                     }
    110                 }
    111                 msg.append(']');
    112             }
    113         }
    114         if (log.isWarnEnabled()) {
    115             log.warn(msg.toString());
    116         }
    117     }
    118
    119 }
    120