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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  package org.apache.log4j.varia;
    19
    20  import org.apache.log4j.AppenderSkeleton;
    21  import org.apache.log4j.spi.LoggingEvent;
    22
    23  import javax.swing.DefaultListModel;
    24  import javax.swing.ListModel;
    25
    26
    27  /**
    28   * A very basic appender that takes the events and stores them in to a
    29   * ListModel for late retrieval.
    30   *
    31   *
    32   * @author Paul Smith (psmith@apache.org)
    33   *
    34   */
    35  public final class ListModelAppender extends AppenderSkeleton {
    36      /**
    37       * Default list model.
    38       */
    39    private final DefaultListModel model = new DefaultListModel();
    40
    41    /**
    42     * Constructs a ListModelAppender.
    43     */
    44    public ListModelAppender() {
    45        super(true);
    46    }
    47    /**
    48     * Returns a reference to the ListModel that contains all the LoggingEvents
    49     * that have been appended to this class.
    50     *
    51     * @return the list model
    52     */
    53    public ListModel getModel() {
    54      return model;
    55    }
    56
    57      /** {@inheritDoc} */
    58    protected void append(final LoggingEvent event) {
    59      model.addElement(event);
    60    }
    61
    62      /** {@inheritDoc} */
    63    public void close() {
    64      clearModel();
    65    }
    66
    67    /**
    68     * Removes all the Events from the model.
    69     */
    70    public void clearModel() {
    71      model.clear();
    72    }
    73
    74      /** {@inheritDoc} */
    75    public boolean requiresLayout() {
    76        return false;
    77    }
    78
    79  }