    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     */
    017    package org.apache.commons.configuration.tree;
    018
    019    import java.io.PrintStream;
    020    import 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 1206489 2011-11-26 16:43:03Z oheger $
    028     * @since 1.7
    029     */
    030    public 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 = (ConfigurationNode) 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 + "  ", (ConfigurationNode) iter.next());
    073                }
    074                newline = true;
    075            }
    076            if (newline)
    077            {
    078                stream.print(indent);
    079            }
    080            stream.println("</" + result.getName() + ">");
    081        }
    082    }