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 *     https://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    /**
029     * Print out the data in the configuration.
030     *
031     * @param stream The OutputStream.
032     * @param result The root node of the tree.
033     */
034    public static void printTree(final PrintStream stream, final ImmutableNode result) {
035        if (stream != null) {
036            printTree(stream, "", result);
037        }
038    }
039
040    private static void printTree(final PrintStream stream, final String indent, final ImmutableNode result) {
041        final StringBuilder buffer = new StringBuilder(indent).append("<").append(result.getNodeName());
042        result.getAttributes().forEach((k, v) -> buffer.append(' ').append(k).append("='").append(v).append("'"));
043        buffer.append(">");
044        stream.print(buffer.toString());
045        if (result.getValue() != null) {
046            stream.print(result.getValue());
047        }
048        boolean newline = false;
049        if (!result.getChildren().isEmpty()) {
050            stream.print("\n");
051            result.forEach(child -> printTree(stream, indent + "  ", child));
052            newline = true;
053        }
054        if (newline) {
055            stream.print(indent);
056        }
057        stream.println("</" + result.getNodeName() + ">");
058    }
059
060    /** Prevent creating this class. */
061    private TreeUtils() {
062    }
063}