| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.karaf.shell.dev.util; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.PrintStream; |
| import java.io.PrintWriter; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * Represents a tree that can be written to the console. |
| * |
| * The output will look like this: |
| * <pre> |
| * root |
| * +- child1 |
| * | +- grandchild |
| * +- child2 |
| * </pre> |
| */ |
| public class Tree<T> extends Node<T> { |
| |
| /** |
| * Creates a new tree with the given root node |
| * |
| * @param root the root node |
| */ |
| public Tree(T root) { |
| super(root); |
| } |
| |
| /** |
| * Write the tree to a PrintStream, using the default toString() method to output the node values |
| * |
| * @param stream |
| */ |
| public void write(PrintStream stream) { |
| write(new PrintWriter(stream)); |
| } |
| |
| /** |
| * Write the tree to a PrintStream, using the provided converter to output the node values |
| * |
| * @param stream |
| * @param converter |
| */ |
| public void write(PrintStream stream, Converter<T> converter) { |
| write(new PrintWriter(stream), converter); |
| } |
| |
| /** |
| * Write the tree to a PrintWriter, using the default toString() method to output the node values |
| * |
| * @param writer |
| */ |
| public void write(PrintWriter writer) { |
| write(writer, new Converter() { |
| public String toString(Node node) { |
| return node.getValue().toString(); |
| } |
| }); |
| } |
| |
| /** |
| * Write the tree to a PrintWriter, using the provided converter to output the node values |
| * |
| * @param writer |
| * @param converter |
| */ |
| public void write(PrintWriter writer, Converter<T> converter) { |
| writer.printf("%s%n", converter.toString(this)); |
| for (Node<T> child : getChildren()) { |
| child.write(writer, converter); |
| } |
| writer.flush(); |
| } |
| |
| /** |
| * Interface to convert node values to string |
| * |
| * @param <T> the object type for the node value |
| */ |
| public static interface Converter<T> { |
| |
| public String toString(Node<T> node); |
| |
| } |
| } |