Class BaseHierarchicalConfiguration.BuilderVisitor

  • All Implemented Interfaces:
    ConfigurationNodeVisitor<ImmutableNode>
    Direct Known Subclasses:
    XMLConfiguration.XMLBuilderVisitor
    Enclosing class:
    BaseHierarchicalConfiguration

    protected abstract static class BaseHierarchicalConfiguration.BuilderVisitor
    extends ConfigurationNodeVisitorAdapter<ImmutableNode>
    A specialized visitor base class that can be used for storing the tree of configuration nodes. The basic idea is that each node can be associated with a reference object. This reference object has a concrete meaning in a derived class, e.g. an entry in a JNDI context or an XML element. When the configuration tree is set up, the load() method is responsible for setting the reference objects. When the configuration tree is later modified, new nodes do not have a defined reference object. This visitor class processes all nodes and finds the ones without a defined reference object. For those nodes the insert() method is called, which must be defined in concrete sub classes. This method can perform all steps to integrate the new node into the original structure.
    • Constructor Detail

      • BuilderVisitor

        protected BuilderVisitor()
    • Method Detail

      • insert

        protected abstract void insert​(ImmutableNode newNode,
                                       ImmutableNode parent,
                                       ImmutableNode sibling1,
                                       ImmutableNode sibling2,
                                       ReferenceNodeHandler refHandler)
        Inserts a new node into the structure constructed by this builder. This method is called for each node that has been added to the configuration tree after the configuration has been loaded from its source. These new nodes have to be inserted into the original structure. The passed in nodes define the position of the node to be inserted: its parent and the siblings between to insert.
        Parameters:
        newNode - the node to be inserted
        parent - the parent node
        sibling1 - the sibling after which the node is to be inserted; can be null if the new node is going to be the first child node
        sibling2 - the sibling before which the node is to be inserted; can be null if the new node is going to be the last child node
        refHandler - the ReferenceNodeHandler
      • insertNewChildNodes

        private void insertNewChildNodes​(ImmutableNode node,
                                         ReferenceNodeHandler refHandler)
        Inserts new children that have been added to the specified node.
        Parameters:
        node - the current node to be processed
        refHandler - the ReferenceNodeHandler
      • update

        protected abstract void update​(ImmutableNode node,
                                       java.lang.Object reference,
                                       ReferenceNodeHandler refHandler)
        Updates a node that already existed in the original hierarchy. This method is called for each node that has an assigned reference object. A concrete implementation should update the reference according to the node's current value.
        Parameters:
        node - the current node to be processed
        reference - the reference object for this node
        refHandler - the ReferenceNodeHandler
      • updateNode

        private void updateNode​(ImmutableNode node,
                                ReferenceNodeHandler refHandler)
        Updates the value of a node. If this node is associated with a reference object, the update() method is called.
        Parameters:
        node - the current node to be processed
        refHandler - the ReferenceNodeHandler