    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}