node/README.org

* Node

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* A parent/children data structure

* Usage

  Add as a dependency in your =pom.xml=:

  #+BEGIN_SRC xml
    <dependency>
      <groupId>net.kemitix</groupId>
      <artifactId>node</artifactId>
      <version>${node.version}</version>
    </dependency>
  #+END_SRC

  The library consits of an interface =Node= and an implementation =NodeItem=.

** Create a root node

   #+BEGIN_SRC java
     Node<String> root = new NodeItem<>("[root]");
   #+END_SRC

** Get the contents of the node

   #+BEGIN_SRC java
     String rootData = root.getData(); // returns "[root]"
   #+END_SRC

** Add a child node

   #+BEGIN_SRC java
     Node<String> child = root.createChild("child");
   #+END_SRC

   Which is shorthand for:

   #+BEGIN_SRC java
     Node<String> child = new NodeItem<>("child");
     root.addChild(child);
   #+END_SRC

   The tree now looks like:

   #+BEGIN_EXAMPLE
   "[root]"
   \-> "child"
   #+END_EXAMPLE

** Get the child node

   #+BEGIN_SRC java
     Node<String> childNode = root.getChild("child");
   #+END_SRC

** Create a chain of nodes

   #+BEGIN_SRC java
     root.createDescendantLine(Arrays.asList("alpha", "beta", "gamma"));
   #+END_SRC

   #+BEGIN_EXAMPLE
   "[root]"
   \-> "alpha"
    \-> "beta"
     \-> "gamma"
   #+END_EXAMPLE

** Walk the tree to find a node

   #+BEGIN_SRC java
     Optional<Node<String>> foundNode = root.walkTree(Arrays.asList("alpha", "beta", "gamma"));
     if (foundNode.isPresent()) {
         String betaData = foundNode.get().getParent().getData();
         // returns "beta"
     }
   #+END_SRC

** Get all children of a node

   #+BEGIN_SRC java
     Set<Node<String>> children = root.getChildren();
     children.size();
     // returns 2 ("child" and "alpha")
   #+END_SRC