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;
020
021/**
022 * Utility methods.
023 *
024 * @since 1.7
025 */
026public final class TreeUtils {
027    /**
028     * Print out the data in the configuration.
029     *
030     * @param stream The OutputStream.
031     * @param result The root node of the tree.
032     */
033    public static void printTree(final PrintStream stream, final ImmutableNode result) {
034        if (stream != null) {
035            printTree(stream, "", result);
036        }
037    }
038
039    private static void printTree(final PrintStream stream, final String indent, final ImmutableNode result) {
040        final StringBuilder buffer = new StringBuilder(indent).append("<").append(result.getNodeName());
041        result.getAttributes().forEach((k, v) -> buffer.append(' ').append(k).append("='").append(v).append("'"));
042        buffer.append(">");
043        stream.print(buffer.toString());
044        if (result.getValue() != null) {
045            stream.print(result.getValue());
046        }
047        boolean newline = false;
048        if (!result.getChildren().isEmpty()) {
049            stream.print("\n");
050            result.forEach(child -> printTree(stream, indent + "  ", child));
051            newline = true;
052        }
053        if (newline) {
054            stream.print(indent);
055        }
056        stream.println("</" + result.getNodeName() + ">");
057    }
058
059    /** Prevent creating this class. */
060    private TreeUtils() {
061    }
062}