com.google.gwt.gen2.logging.handler.client.GroupedLogHandler.java Source code

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Here is the source code for com.google.gwt.gen2.logging.handler.client.GroupedLogHandler.java

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/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed 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 com.google.gwt.gen2.logging.handler.client;

import com.google.gwt.gen2.logging.shared.LogEvent;
import com.google.gwt.gen2.logging.shared.LogFormatter;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;

/**
 * Publishes log messages grouped by category using a gwt {@link Tree} widget.
 */
public class GroupedLogHandler extends ScrollableLogHandler<Tree> {
    private TreeItem groupedByCatagory;
    private TreeItem topLevel;

    /**
     * Constructor.
     */
    public GroupedLogHandler() {
        super("gwt-GroupedLogHandler");
    }

    public void onLog(LogEvent e) {
        TreeItem parent;
        String category = e.getCategory();
        if (category == null) {
            parent = topLevel;
        } else {
            parent = groupedByCatagory;
            String[] args = LogHandlerUtil.splitCategory(category);

            for (int i = 0; i < args.length; i++) {
                parent = ensureChild(parent, args[i]);
            }
        }

        TreeItem target = new TreeItem(LogFormatter.HTML.format(e));
        parent.addItem(target);
        getContents().setSelectedItem(target);
        getContents().ensureSelectedItemVisible();
    }

    @Override
    protected Tree createContents() {
        Tree tree = new Tree();
        groupedByCatagory = tree.addItem("catagorized");
        topLevel = tree.addItem("default");
        return tree;
    }

    private TreeItem ensureChild(TreeItem parent, String childName) {
        TreeItem key = null;
        for (int j = 0; j < parent.getChildCount(); j++) {
            TreeItem child = parent.getChild(j);
            if (child.getText().equals(childName)) {
                key = child;
                break;
            }
        }
        if (key == null) {
            key = parent.addItem(childName);
        }
        return key;
    }
}