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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  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  /*
    19   */
    20  package org.apache.log4j.chainsaw;
    21
    22  import javax.swing.event.EventListenerList;
    23  import java.util.Collection;
    24  import java.util.Collections;
    25  import java.util.HashSet;
    26  import java.util.Set;
    27
    28
    29  /**
    30   * An implementation of LoggerNameModel which can be used as a delegate
    31   *
    32   * @author Paul Smith &lt;psmith@apache.org&gt;
    33   */
    34  public class LoggerNameModelSupport implements LoggerNameModel {
    35
    36      private Set<String> loggerNameSet = new HashSet<>();
    37      private EventListenerList listenerList = new EventListenerList();
    38
    39
    40      /* (non-Javadoc)
    41       * @see org.apache.log4j.chainsaw.LoggerNameModel#getLoggerNames()
    42       */
    43      public Collection getLoggerNames() {
    44          return Collections.unmodifiableSet(loggerNameSet);
    45      }
    46
    47      /* (non-Javadoc)
    48       * @see org.apache.log4j.chainsaw.LoggerNameModel#addLoggerName(java.lang.String)
    49       */
    50      public boolean addLoggerName(String loggerName) {
    51          boolean isNew = loggerNameSet.add(loggerName);
    52
    53          if (isNew) {
    54              notifyListeners(loggerName);
    55          }
    56
    57          return isNew;
    58      }
    59
    60      public void reset() {
    61          loggerNameSet.clear();
    62          LoggerNameListener[] eventListeners = listenerList.getListeners(LoggerNameListener.class);
    63
    64          for (LoggerNameListener listener : eventListeners) {
    65              listener.reset();
    66          }
    67      }
    68
    69      /**
    70       * Notifies all the registered listeners that a new unique
    71       * logger name has been added to this model
    72       *
    73       * @param loggerName
    74       */
    75      private void notifyListeners(String loggerName) {
    76          LoggerNameListener[] eventListeners = listenerList.getListeners(LoggerNameListener.class);
    77
    78          for (LoggerNameListener listener : eventListeners) {
    79              listener.loggerNameAdded(loggerName);
    80          }
    81      }
    82
    83      /* (non-Javadoc)
    84       * @see org.apache.log4j.chainsaw.LoggerNameModel#addLoggerNameListener(org.apache.log4j.chainsaw.LoggerNameListener)
    85       */
    86      public void addLoggerNameListener(LoggerNameListener l) {
    87          listenerList.add(LoggerNameListener.class, l);
    88      }
    89
    90      /* (non-Javadoc)
    91       * @see org.apache.log4j.chainsaw.LoggerNameModel#removeLoggerNameListener(org.apache.log4j.chainsaw.LoggerNameListener)
    92       */
    93      public void removeLoggerNameListener(LoggerNameListener l) {
    94          listenerList.remove(LoggerNameListener.class, l);
    95      }
    96  }