    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.configuration2.tree;
    018
    019import java.io.PrintStream;
    020import java.util.Map;
    021
    022/**
    023 * Utility methods.
    024 *
    025 * @since 1.7
    026 */
    027public final class TreeUtils
    028{
    029    /** Prevent creating this class. */
    030    private TreeUtils()
    031    {
    032    }
    033
    034    /**
    035     * Print out the data in the configuration.
    036     * @param stream The OutputStream.
    037     * @param result The root node of the tree.
    038     */
    039    public static void printTree(final PrintStream stream, final ImmutableNode result)
    040    {
    041        if (stream != null)
    042        {
    043            printTree(stream, "", result);
    044        }
    045    }
    046
    047    private static void printTree(final PrintStream stream, final String indent, final ImmutableNode result)
    048    {
    049        final StringBuilder buffer = new StringBuilder(indent).append("<").append(result.getNodeName());
    050        for (final Map.Entry<String, Object> e : result.getAttributes().entrySet())
    051        {
    052            buffer.append(' ').append(e.getKey()).append("='").append(e.getValue()).append("'");
    053        }
    054        buffer.append(">");
    055        stream.print(buffer.toString());
    056        if (result.getValue() != null)
    057        {
    058            stream.print(result.getValue());
    059        }
    060        boolean newline = false;
    061        if (!result.getChildren().isEmpty())
    062        {
    063            stream.print("\n");
    064            for (final ImmutableNode child : result.getChildren())
    065            {
    066                printTree(stream, indent + "  ", child);
    067            }
    068            newline = true;
    069        }
    070        if (newline)
    071        {
    072            stream.print(indent);
    073        }
    074        stream.println("</" + result.getNodeName() + ">");
    075    }
    076}