org.apache.commons.configuration2.tree

## Class ImmutableNode

- java.lang.Object
- - org.apache.commons.configuration2.tree.ImmutableNode

-     public class ImmutableNode
      extends Object

  An immutable default implementation for configuration nodes.

  This class is used for an in-memory representation of hierarchical configuration data. It stores typical information like a node name, a value, child nodes, or attributes.

  After their creation, instances cannot be manipulated. There are methods for updating properties, but these methods return new `ImmutableNode` instances. Instances are created using the nested `Builder` class.

  Since:
    2.0
  Version:
    $Id: ImmutableNode.java 1624601 2014-09-12 18:04:36Z oheger $

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `ImmutableNode.Builder` A builder class for creating instances of `ImmutableNode`.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `ImmutableNode` | `addChild(ImmutableNode child)` Creates a new `ImmutableNode` instance which is a copy of this object, but has the given child node added.
    `Map<String,Object>` | `getAttributes()` Returns a map with the attributes of this node.
    `List<ImmutableNode>` | `getChildren()` Returns a list with the children of this node.
    `String` | `getNodeName()` Returns the name of this node.
    `Object` | `getValue()` Returns the value of this node.
    `ImmutableNode` | `removeAttribute(String name)` Returns a new `ImmutableNode` instance which is a copy of this object, but with the specified attribute removed.
    `ImmutableNode` | `removeChild(ImmutableNode child)` Returns a new `ImmutableNode` instance which is a copy of this object, but with the given child node removed.
    `ImmutableNode` | `replaceChild(ImmutableNode oldChild, ImmutableNode newChild)` Returns a new `ImmutableNode` instance which is a copy of this object, but with the given child replaced by the new one.
    `ImmutableNode` | `replaceChildren(Collection<ImmutableNode> newChildren)` Returns a new `ImmutableNode` instance which is a copy of this object, but with the children replaced by the ones in the passed in collection.
    `ImmutableNode` | `setAttribute(String name, Object value)` Returns a new `ImmutableNode` instance which is a copy of this object, but with the specified attribute set to the given value.
    `ImmutableNode` | `setAttributes(Map<String,?> newAttributes)` Returns a new `ImmutableNode` instance which is a copy of this object, but with all attributes added defined by the given map.
    `ImmutableNode` | `setName(String name)` Creates a new `ImmutableNode` instance which is a copy of this object with the name changed to the passed in value.
    `ImmutableNode` | `setValue(Object newValue)` Creates a new `ImmutableNode` instance which is a copy of this object with the value changed to the passed in value.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Method Detail

    - #### getNodeName

          public String getNodeName()

      Returns the name of this node.
      Returns:
        the name of this node

    - #### getValue

          public Object getValue()

      Returns the value of this node.
      Returns:
        the value of this node

    - #### getChildren

          public List<ImmutableNode> getChildren()

      Returns a list with the children of this node. This list cannot be modified.
      Returns:
        a list with the child nodes

    - #### getAttributes

          public Map<String,Object> getAttributes()

      Returns a map with the attributes of this node. This map cannot be modified.
      Returns:
        a map with this node's attributes

    - #### setName

          public ImmutableNode setName(String name)

      Creates a new `ImmutableNode` instance which is a copy of this object with the name changed to the passed in value.
      Parameters:
        `name` - the name of the newly created node
      Returns:
        the new node with the changed name

    - #### setValue

          public ImmutableNode setValue(Object newValue)

      Creates a new `ImmutableNode` instance which is a copy of this object with the value changed to the passed in value.
      Parameters:
        `newValue` - the value of the newly created node
      Returns:
        the new node with the changed value

    - #### addChild

          public ImmutableNode addChild(ImmutableNode child)

      Creates a new `ImmutableNode` instance which is a copy of this object, but has the given child node added.
      Parameters:
        `child` - the child node to be added (must not be null)
      Returns:
        the new node with the child node added
      Throws:
        `IllegalArgumentException` - if the child node is null

    - #### removeChild

          public ImmutableNode removeChild(ImmutableNode child)

      Returns a new `ImmutableNode` instance which is a copy of this object, but with the given child node removed. If the child node does not belong to this node, the same node instance is returned.
      Parameters:
        `child` - the child node to be removed
      Returns:
        the new node with the child node removed

    - #### replaceChild

          public ImmutableNode replaceChild(ImmutableNode oldChild,
                                   ImmutableNode newChild)

      Returns a new `ImmutableNode` instance which is a copy of this object, but with the given child replaced by the new one. If the child to be replaced cannot be found, the same node instance is returned.
      Parameters:
        `oldChild` - the child node to be replaced
        `newChild` - the replacing child node (must not be null)
      Returns:
        the new node with the child replaced
      Throws:
        `IllegalArgumentException` - if the new child node is null

    - #### replaceChildren

          public ImmutableNode replaceChildren(Collection<ImmutableNode> newChildren)

      Returns a new `ImmutableNode` instance which is a copy of this object, but with the children replaced by the ones in the passed in collection. With this method all children can be replaced in a single step. For the collection the same rules apply as for `ImmutableNode.Builder.addChildren(Collection)`.
      Parameters:
        `newChildren` - the collection with the new children (may be null)

    - #### setAttribute

          public ImmutableNode setAttribute(String name,
                                   Object value)

      Returns a new `ImmutableNode` instance which is a copy of this object, but with the specified attribute set to the given value. If an attribute with this name does not exist, it is created now. Otherwise, the new value overrides the old one.
      Parameters:
        `name` - the name of the attribute
        `value` - the attribute value
      Returns:
        the new node with this attribute

    - #### setAttributes

          public ImmutableNode setAttributes(Map<String,?> newAttributes)

      Returns a new `ImmutableNode` instance which is a copy of this object, but with all attributes added defined by the given map. This method is analogous to `setAttribute(String, Object)`, but all attributes in the given map are added. If the map is null or empty, this method has no effect.
      Parameters:
        `newAttributes` - the map with attributes to be added
      Returns:
        the new node with these attributes

    - #### removeAttribute

          public ImmutableNode removeAttribute(String name)

      Returns a new `ImmutableNode` instance which is a copy of this object, but with the specified attribute removed. If there is no attribute with the given name, the same node instance is returned.
      Parameters:
        `name` - the name of the attribute
      Returns:
        the new node without this attribute

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