| // Copyright 2011 The Apache Software Foundation |
| // |
| // Licensed 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.tapestry5.tree; |
| |
| import java.util.List; |
| |
| /** |
| * A node within a {@link TreeModel}. In a {@link DefaultTreeModel}, most of the node's information |
| * comes via the {@link TreeModelAdapter}. |
| * |
| * @param <T> |
| * type of node |
| * @since 5.3 |
| */ |
| public interface TreeNode<T> |
| { |
| /** |
| * Returns a string Id for the node that uniquely identifies it. |
| * |
| * @return unique string identifying the node |
| * @see TreeModel#getById(String) |
| */ |
| String getId(); |
| |
| /** Returns the value represented by this node. */ |
| T getValue(); |
| |
| /** |
| * If true, then this node is a leaf node, which never has children (i.e., a file). If false, the node |
| * may have children (i.e., a folder). |
| * |
| * @return true for leaf nodes, false for folder nodes |
| * @see TreeModelAdapter#isLeaf(Object) |
| */ |
| boolean isLeaf(); |
| |
| /** |
| * Returns true if this non-leaf node has child nodes. This will not be invoked for leaf nodes. |
| * |
| * @see TreeModelAdapter#hasChildren(Object) |
| */ |
| boolean getHasChildren(); |
| |
| /** |
| * Returns the actual children of this non-leaf node, as additional nodes. |
| * |
| * @see TreeModelAdapter#getChildren(Object) |
| */ |
| List<TreeNode<T>> getChildren(); |
| |
| // TODO: Some way to influence the rendered output (i.e., to display different icons based on |
| // file type). |
| |
| /** |
| * Returns a textual label for the node. Not all UIs will make use of the label, but default UIs will. |
| * |
| * @see TreeModelAdapter#getLabel(Object) |
| */ |
| public String getLabel(); |
| } |