1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.configuration2.tree;
18
19 import java.io.PrintStream;
20
21 /**
22 * Utility methods.
23 *
24 * @since 1.7
25 */
26 public final class TreeUtils {
27 /** Prevent creating this class. */
28 private TreeUtils() {
29 }
30
31 /**
32 * Print out the data in the configuration.
33 *
34 * @param stream The OutputStream.
35 * @param result The root node of the tree.
36 */
37 public static void printTree(final PrintStream stream, final ImmutableNode result) {
38 if (stream != null) {
39 printTree(stream, "", result);
40 }
41 }
42
43 private static void printTree(final PrintStream stream, final String indent, final ImmutableNode result) {
44 final StringBuilder buffer = new StringBuilder(indent).append("<").append(result.getNodeName());
45 result.getAttributes().forEach((k, v) -> buffer.append(' ').append(k).append("='").append(v).append("'"));
46 buffer.append(">");
47 stream.print(buffer.toString());
48 if (result.getValue() != null) {
49 stream.print(result.getValue());
50 }
51 boolean newline = false;
52 if (!result.getChildren().isEmpty()) {
53 stream.print("\n");
54 result.forEach(child -> printTree(stream, indent + " ", child));
55 newline = true;
56 }
57 if (newline) {
58 stream.print(indent);
59 }
60 stream.println("</" + result.getNodeName() + ">");
61 }
62 }