001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *     http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.configuration.tree;
018
019import java.io.PrintStream;
020import java.util.Iterator;
021
022/**
023 * Utility methods.
024 * @author <a
025 * href="http://commons.apache.org/configuration/team-list.html">Commons
026 * Configuration team</a>
027 * @version $Id: TreeUtils.java 1301991 2012-03-17 20:18:02Z sebb $
028 * @since 1.7
029 */
030public final class TreeUtils
031{
032    /** Prevent creating this class. */
033    private TreeUtils()
034    {
035    }
036
037    /**
038     * Print out the data in the configuration.
039     * @param stream The OutputStream.
040     * @param result The root node of the tree.
041     */
042    public static void printTree(PrintStream stream, ConfigurationNode result)
043    {
044        if (stream != null)
045        {
046            printTree(stream, "", result);
047        }
048    }
049
050    private static void printTree(PrintStream stream, String indent, ConfigurationNode result)
051    {
052        StringBuffer buffer = new StringBuffer(indent).append("<").append(result.getName());
053        Iterator<ConfigurationNode> iter = result.getAttributes().iterator();
054        while (iter.hasNext())
055        {
056            ConfigurationNode node = iter.next();
057            buffer.append(" ").append(node.getName()).append("='").append(node.getValue()).append("'");
058        }
059        buffer.append(">");
060        stream.print(buffer.toString());
061        if (result.getValue() != null)
062        {
063            stream.print(result.getValue());
064        }
065        boolean newline = false;
066        if (result.getChildrenCount() > 0)
067        {
068            stream.print("\n");
069            iter = result.getChildren().iterator();
070            while (iter.hasNext())
071            {
072                printTree(stream, indent + "  ", iter.next());
073            }
074            newline = true;
075        }
076        if (newline)
077        {
078            stream.print(indent);
079        }
080        stream.println("</" + result.getName() + ">");
081    }
082}