Apache Log4j provides the interface that applications should code to and provides the adapter components required for implementers to create a logging implementation.

Bytecode (Java 1.4) for Apache Log4j is provided in a JAR file like log4j-1.2.17.jar.

Source Code files for Apache Log4j are provided in both binary packge like log4j-1.2.17.zip and source package like log4j-1.2.17-sources.zip. You can download them at Apache Log4j Website.

You can also browse Source Code files for Apache Log4j 1.2.17 below.

⏎ org/apache/log4j/lf5/viewer/categoryexplorer/CategoryExplorerTree.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.log4j.lf5.viewer.categoryexplorer;

import java.awt.event.MouseEvent;

import javax.swing.JTree;
import javax.swing.event.TreeModelEvent;
import javax.swing.tree.TreePath;

/**
 * CategoryExplorerTree
 *
 * @author Michael J. Sikorsky
 * @author Robert Shaw
 * @author Brent Sprecher
 * @author Brad Marlborough
 */

// Contributed by ThoughtWorks Inc.

public class CategoryExplorerTree extends JTree {
  private static final long serialVersionUID = 8066257446951323576L;
  //--------------------------------------------------------------------------
  //   Constants:
  //--------------------------------------------------------------------------

  //--------------------------------------------------------------------------
  //   Protected Variables:
  //--------------------------------------------------------------------------
  protected CategoryExplorerModel _model;
  protected boolean _rootAlreadyExpanded = false;

  //--------------------------------------------------------------------------
  //   Private Variables:
  //--------------------------------------------------------------------------

  //--------------------------------------------------------------------------
  //   Constructors:
  //--------------------------------------------------------------------------

  /**
   * Construct a CategoryExplorerTree with a specific model.
   */
  public CategoryExplorerTree(CategoryExplorerModel model) {
    super(model);

    _model = model;
    init();
  }

  /**
   * Construct a CategoryExplorerTree and create a default CategoryExplorerModel.
   */
  public CategoryExplorerTree() {
    super();

    CategoryNode rootNode = new CategoryNode("Categories");

    _model = new CategoryExplorerModel(rootNode);

    setModel(_model);

    init();
  }

  //--------------------------------------------------------------------------
  //   Public Methods:
  //--------------------------------------------------------------------------

  public CategoryExplorerModel getExplorerModel() {
    return (_model);
  }

  public String getToolTipText(MouseEvent e) {

    try {
      return super.getToolTipText(e);
    } catch (Exception ex) {
      return "";
    }

  }

  //--------------------------------------------------------------------------
  //   Protected Methods:
  //--------------------------------------------------------------------------

  protected void init() {
    // Put visible lines on the JTree.
    putClientProperty("JTree.lineStyle", "Angled");

    // Configure the Tree with the appropriate Renderers and Editors.

    CategoryNodeRenderer renderer = new CategoryNodeRenderer();
    setEditable(true);
    setCellRenderer(renderer);

    CategoryNodeEditor editor = new CategoryNodeEditor(_model);

    setCellEditor(new CategoryImmediateEditor(this,
        new CategoryNodeRenderer(),
        editor));
    setShowsRootHandles(true);

    setToolTipText("");

    ensureRootExpansion();

  }

  protected void expandRootNode() {
    if (_rootAlreadyExpanded) {
      return;
    }
    _rootAlreadyExpanded = true;
    TreePath path = new TreePath(_model.getRootCategoryNode().getPath());
    expandPath(path);
  }

  protected void ensureRootExpansion() {
    _model.addTreeModelListener(new TreeModelAdapter() {
      public void treeNodesInserted(TreeModelEvent e) {
        expandRootNode();
      }
    });
  }

  //--------------------------------------------------------------------------
  //   Private Methods:
  //--------------------------------------------------------------------------

  //--------------------------------------------------------------------------
  //   Nested Top-Level Classes or Interfaces:
  //--------------------------------------------------------------------------

}

⏎ org/apache/log4j/lf5/viewer/categoryexplorer/CategoryExplorerTree.java

Or download all of them as a single archive file:

File name: log4j-1.2.17-sources.jar
File size: 481200 bytes
Release date: 2012-05-06
Download 

⇒ Download and Install apache-log4j-1.2.15.zip

⇐ Download and Install log4j-1.2.17.zip

⇑ Downloading Apache Log4j 1.x JAR Packages

⇑⇑ FAQ for Apache Log4j