Examples of org.apache.click.extras.tree.TreeNode

org.apache.click.extras.tree.TreeNode
Provides an implementation of a {@link org.apache.click.extras.tree.Tree} model.
TreeNode's are used to store hierarchical data representations for example directories, subdirectories and files.
Nodes must have a unique id. If nodes do not have a unique id, the tree might behave erratic.
Each node can store a user defined value of type {@link java.lang.Object}.
Nodes contain a reference to their parent node as well as their children.
Two types of leaf nodes are supported by this implementation. A leaf node can either support the addition of new child nodes or not. An example of a leaf node where children are supported is a directory. A directory can be empty, meaning it is a leaf node, but files and subdirectories can be added as children. Another type of of leaf node does not support the addition of child nodes. A file would be an example of such a node. A file does not support the addition of new files or subdirectories as children. By default newly created nodes supports the addition of child nodes. Use the appropriate constructor to disable the support of child nodes, or call {@link #setChildrenSupported(boolean)}.
Note: Since each TreeNode must have a unique id within the tree, a default id is generated if one is not provided in the constructors. Id's are generated by an instance of {@link java.util.Random}. The current implementation generates a Long using random.nextLong(). This means a total of 2 ⁶⁴ numbers can be generated.

        tree = createTree();


        //Try and load the already stored nodes from the session.
        //If this is the first time we access the page, this method
        //will return null, indicating no nodes is stored.
        TreeNode existingRootNode = loadNodesFromSession();


        if(existingRootNode != null) {
            //OK we had already nodes stored in the session, so no need
            //to rebuild them. We attach the root node and return.
            tree.setRootNode(existingRootNode);


            //By default root node is not displayed in browser. Here we expand it,
            //so that the root's children are visible.
            tree.expand(existingRootNode);
            return tree;
        }


        TreeNode root = createNodes();


        //Attach the root node containing all the other nodes to the tree
        tree.setRootNode(root);


        //By default root node is not displayed in browser. Here we expand it,

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        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("c:");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode dev = new TreeNode("dev","1");
        root.add(dev);


        //The following 3 nodes represent files in the directory as children of
        // the dev node. Note the false argument to the constructor.
        // This means that the specific node does not support child nodes, and
        // it will be rendered as a leaf icon. If children are supported (the
        // default value) then even  if the node is a leaf, it will still be rendered
        // as a collapsed icon. In the example a default leaf node will be
        // rendered as a directory, and a node that does not support children is
        // rendered as a file.
        // Also note the node with the long text, will cause the tree to overflow
        // and add scrollbars
        dev.add(new TreeNode("java.pdf", "1.1", false));
        dev.add(new TreeNode("JEE 6 - the new fantastic approach to write better software (apparently)", "1.2", false));
        dev.add(new TreeNode("ruby.pdf", "1.3", false));


        //We continue constructing the rest of the tree
        TreeNode programFiles = new TreeNode("program files", "2");
        root.add(programFiles);
        programFiles.add(new TreeNode("Adobe", "2.1"));


        TreeNode download = new TreeNode("downloads","3");
        root.add(download);


        TreeNode web = new TreeNode("web", "3.1");
        download.add(web);
        web.add(new TreeNode("html.pdf", "3.1.1", false));
        web.add(new TreeNode("css.html", "3.1.2", false));


        TreeNode databases = new TreeNode("databases", "3.2");
        download.add(databases);
        TreeNode relationalDb = new TreeNode("relational", "3.2.1");
        databases.add(relationalDb);


        relationalDb.add(new TreeNode("mysql.html", "3.2.1.1", false));
        relationalDb.add(new TreeNode("oracle.pdf", "3.2.1.2", false));
        relationalDb.add(new TreeNode("postgres", "3.2.1.3", false));


        TreeNode objectDb = new TreeNode("object", "3.2.2");
        databases.add(objectDb);
        objectDb.add(new TreeNode("db4o.html", "3.2.2.1", false));


        return root;
    }

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        String expandId = getContext().getRequestParameter(Tree.EXPAND_TREE_NODE_PARAM);
        if(selectId == null && expandId == null) {
            return;
        }


        TreeNode node = null;
        if(selectId != null) {
            node = tree.find(selectId);
        } else {
            node = tree.find(expandId);
        }

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        tree = createTree();


        //Try and load the already stored nodes from the session.
        //If this is the first time we access the page, this method
        //will return null, indicating no nodes is stored.
        TreeNode existingRootNode = loadNodesFromSession();


        if(existingRootNode != null) {
            //OK we had already nodes stored in the session, so no need
            //to rebuild them. We attach the root node and return.
            tree.setRootNode(existingRootNode);


            //By default root node is not displayed in browser. Here we expand it,
            //so that the root's children are visible.
            tree.expand(existingRootNode);
            return tree;
        }


        TreeNode root = createNodes();


        //Attach the root node containing all the other nodes to the tree
        tree.setRootNode(root);


        //By default root node is not displayed in browser. Here we expand it,

View Full Code Here

        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("c:");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode dev = new TreeNode("dev","1", root);


        //The following 3 nodes represent files in the directory, setting the
        //dev node as their parent. Note the false argument to the constructor.
        //This means that the specific node does not support child nodes, and
        //it will be rendered as a leaf icon. If children are supported (the
        //default value) then even  if the node is a leaf, it will still be rendered
        //as a collapsed icon. In the example a default leaf node will be
        //rendered as a directory, and a node that does not support children is
        //rendered as a file.
        // Also note the node with the long text, will cause the tree to overflow
        // and add scrollbars
        new TreeNode("java.pdf", "1.1", dev, false);
        new TreeNode("JEE 6 - the new fantastic approach to write better software (apparently)", "1.2", dev, false);
        new TreeNode("ruby.pdf", "1.3", dev, false);


        //We continue constructing the rest of the tree
        TreeNode programFiles = new TreeNode("program files", "2", root);
        new TreeNode("Adobe", "2.1", programFiles);


        TreeNode download = new TreeNode("downloads","3", root);


        TreeNode web = new TreeNode("web", "3.1", download);
        new TreeNode("html.pdf", "3.1.1", web, false);
        new TreeNode("css.html", "3.1.2", web, false);


        TreeNode databases = new TreeNode("databases", "3.2", download);
        TreeNode relationalDb = new TreeNode("relational", "3.2.1", databases);


        new TreeNode("mysql.html", "3.2.1.1", relationalDb, false);
        new TreeNode("oracle.pdf", "3.2.1.2", relationalDb, false);
        new TreeNode("postgres", "3.2.1.3", relationalDb, false);


        TreeNode objectDb = new TreeNode("object", "3.2.2", databases);
        new TreeNode("db4o.html", "3.2.2.1", objectDb, false);


        return root;
    }

View Full Code Here

        tree = createTree();


        //Try and load the already stored nodes from the session.
        //If this is the first time we access the page, this method
        //will return null, indicating no nodes is stored.
        TreeNode existingRootNode = loadNodesFromSession();


        if(existingRootNode != null) {
            //OK we had already nodes stored in the session, so no need
            //to rebuild them. We attach the root node and return.
            tree.setRootNode(existingRootNode);


            return tree;
        }


        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("c:");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode dev = new TreeNode("dev","1", root);


        //The following 3 nodes represent files in the directory, setting the
        //dev node as their parent. Note the false argument to the constructor.
        //This means that the specific node does not support child nodes, and
        //it will be rendered as a leaf icon. If children are supported (the
        //default value) then even  if the node is a leaf, it will still be rendered
        //as a collapsed icon. In the example a default leaf node will be
        //rendered as a directory, and a node that does not support children is
        //rendered as a file.
        // Also note the node with the long text, will cause the tree to overflow
        // and add scrollbars
        new TreeNode("java.pdf", "1.1", dev, false);
        new TreeNode("JEE 6 - the new fantastic approach to write better software (apparently)", "1.2", dev, false);
        new TreeNode("ruby.pdf", "1.3", dev, false);


        //We continue constructing the rest of the tree
        TreeNode programFiles = new TreeNode("program files", "2", root);
        new TreeNode("Adobe", "2.1", programFiles);


        TreeNode download = new TreeNode("downloads","3", root);


        TreeNode web = new TreeNode("web", "3.1", download);
        new TreeNode("html.pdf", "3.1.1", web, false);
        new TreeNode("css.html", "3.1.2", web, false);


        TreeNode databases = new TreeNode("databases", "3.2", download);
        TreeNode relationalDb = new TreeNode("relational", "3.2.1", databases);


        new TreeNode("mysql.html", "3.2.1.1", relationalDb, false);
        new TreeNode("oracle.pdf", "3.2.1.2", relationalDb, false);
        new TreeNode("postgres", "3.2.1.3", relationalDb, false);


        TreeNode objectDb = new TreeNode("object", "3.2.2", databases);
        new TreeNode("db4o.html", "3.2.2.1", objectDb, false);


        //Attach the root node containing all the other nodes to the tree
        tree.setRootNode(root);


        //By default root node is not displayed in browser. Here we expand it,

View Full Code Here

        tree = createTree();


        //Try and load the already stored nodes from the session.
        //If this is the first time we access the page, this method
        //will return null, indicating no nodes is stored.
        TreeNode existingRootNode = loadNodesFromSession();


        if(existingRootNode != null) {
            //OK we had already nodes stored in the session, so no need
            //to rebuild them. We attach the root node and return.
            tree.setRootNode(existingRootNode);


            return tree;
        }


        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("c:");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode dev = new TreeNode("dev","1", root);


        //The following 3 nodes represent files in the directory, setting the
        //dev node as their parent. Note the false argument to the constructor.
        //This means that the specific node does not support child nodes, and
        //it will be rendered as a leaf icon. If children are supported (the
        //default value) then even  if the node is a leaf, it will still be rendered
        //as a collapsed icon. In the example a default leaf node will be
        //rendered as a directory, and a node that does not support children is
        //rendered as a file.
        // Also note the node with the long text, will cause the tree to overflow
        // and add scrollbars
        new TreeNode("java.pdf", "1.1", dev, false);
        new TreeNode("JEE 6 - the new fantastic approach to write better software (apparently)", "1.2", dev, false);
        new TreeNode("ruby.pdf", "1.3", dev, false);


        //We continue constructing the rest of the tree
        TreeNode programFiles = new TreeNode("program files", "2", root);
        new TreeNode("Adobe", "2.1", programFiles);


        TreeNode download = new TreeNode("downloads","3", root);


        TreeNode web = new TreeNode("web", "3.1", download);
        new TreeNode("html.pdf", "3.1.1", web, false);
        new TreeNode("css.html", "3.1.2", web, false);


        TreeNode databases = new TreeNode("databases", "3.2", download);
        TreeNode relationalDb = new TreeNode("relational", "3.2.1", databases);


        new TreeNode("mysql.html", "3.2.1.1", relationalDb, false);
        new TreeNode("oracle.pdf", "3.2.1.2", relationalDb, false);
        new TreeNode("postgres", "3.2.1.3", relationalDb, false);


        TreeNode objectDb = new TreeNode("object", "3.2.2", databases);
        new TreeNode("db4o.html", "3.2.2.1", objectDb, false);


        //Attach the root node containing all the other nodes to the tree
        tree.setRootNode(root);


        //By default root node is not displayed in browser. Here we expand it,

View Full Code Here

        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("Pages");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode general = new TreeNode("Intro", "1", root);


        boolean supportsChildNodes = false;


        new TreeNode(HelloWorld.class, "1.1", general, supportsChildNodes);
        new TreeNode(ControlListenerType1Page.class, "1.2", general, supportsChildNodes);
        new TreeNode(ControlListenerType2Page.class, "1.3", general, supportsChildNodes);


        TreeNode forms = new TreeNode("Forms", "2", root);
        new TreeNode(SimpleForm.class, "2.1", forms, supportsChildNodes);
        new TreeNode(AdvancedForm.class, "2.2", forms, supportsChildNodes);


        TreeNode tables = new TreeNode("Tables", "3", root);
        new TreeNode(SimpleTable.class, "3.1", tables, supportsChildNodes);
        new TreeNode(AdvancedTable.class, "3.2", tables, supportsChildNodes);


        return root;
    }

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        tree = createTree();


        //Try and load the already stored nodes from the session.
        //If this is the first time we access the page, this method
        //will return null, indicating no nodes is stored.
        TreeNode existingRootNode = loadNodesFromSession();


        if(existingRootNode != null) {
            //OK we had already nodes stored in the session, so no need
            //to rebuild them. We attach the root node and return.
            tree.setRootNode(existingRootNode);


            return tree;
        }


        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("c:");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode dev = new TreeNode("dev","1", root);


        //The follwing 2 nodes represent files in the directory, setting the
        //dev node as their parent. Note the false argument to the constructor.
        //This means that the specific node does not support child nodes, and
        //it will be rendered as a leaf icon. If children are supported (the
        //default value) then even  if the node is a leaf, it will still be rendered
        //as a collapsed icon. In the example a default leaf node will be
        //rendered as a directory, and a node that does not support children is
        //rendered as a file.
        new TreeNode("java.pdf", "2", dev, false);
        new TreeNode("ruby.pdf", "3", dev, false);


        //We continue constructing the rest of the tree
        TreeNode programFiles = new TreeNode("program files", "4", root);
        new TreeNode("Adobe", "5", programFiles);


        TreeNode download = new TreeNode("downloads","6", root);


        TreeNode web = new TreeNode("web", "7", download);
        new TreeNode("html.pdf", "8", web, false);
        new TreeNode("css.html", "9", web, false);


        TreeNode databases = new TreeNode("databases", "10", download);
        new TreeNode("mysql.html","11",databases, false);
        new TreeNode("oracle.pdf","12",databases, false);
        new TreeNode("postgres","13",databases, false);


        //Attach the root node containing all the other nodes to the tree
        tree.setRootNode(root);


        //By default root node is not displayed in browser. Here we expand it,

View Full Code Here

        //Create a node representing the root directory with the specified
        //parameter as the value. Because an id is not specified, a random
        //one will be generated by the node. By default the root node is
        //not rendered by the tree. This can be changed by calling
        //tree.setRootNodeDisplayed(true).
        TreeNode root = new TreeNode("Pages");


        //Create a new directory, setting the root directory as its parent. Here
        //we do specify a id as the 2nd argument, so no id is generated.
        TreeNode general = new TreeNode("Intro", "1", root);


        boolean supportsChildNodes = false;


        new TreeNode(HelloWorld.class, "1.1", general, supportsChildNodes);
        new TreeNode(ControlListenerPage.class, "1.2", general, supportsChildNodes);


        TreeNode forms = new TreeNode("Forms", "2", root);
        new TreeNode(SimpleForm.class, "2.1", forms, supportsChildNodes);
        new TreeNode(AdvancedForm.class, "2.2", forms, supportsChildNodes);


        TreeNode tables = new TreeNode("Tables", "3", root);
        new TreeNode(SimpleTable.class, "3.1", tables, supportsChildNodes);
        new TreeNode(AdvancedTable.class, "3.2", tables, supportsChildNodes);


        return root;
    }

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