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