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## org.apache.jasper.parser
Class TreeNode

    java.lang.Object
      |
      +--org.apache.jasper.parser.TreeNode

public class TreeNode
extends java.lang.Object

Simplified implementation of a Node from a Document Object Model (DOM) parse of an XML document. This class is used to represent a DOM tree so that the XML parser's implementation of `org.w3c.dom` need not be visible to the remainder of Jasper.

WARNING - Construction of a new tree, or modifications to an existing one, are not thread-safe and such accesses must be synchronized.

Version:
  $Revision: 1.2 $ $Date: 2001/02/16 22:17:08 $
Author:
  Craig R. McClanahan

Field Summary
`protected java.util.HashMap` | `attributes` The attributes of this node, keyed by attribute name, Instantiated only if required.
`protected java.lang.String` | `body` The body text associated with this node (if any).
`protected java.util.ArrayList` | `children` The children of this node, instantiated only if required.
`protected java.lang.String` | `name` The name of this node.
`protected TreeNode` | `parent` The parent node of this node.

Constructor Summary
`TreeNode(java.lang.String name)` Construct a new node with no parent.
`TreeNode(java.lang.String name, TreeNode parent)` Construct a new node with the specified parent.

Method Summary
`void` | `addAttribute(java.lang.String name, java.lang.String value)` Add an attribute to this node, replacing any existing attribute with the same name.
`void` | `addChild(TreeNode node)` Add a new child node to this node.
`java.lang.String` | `findAttribute(java.lang.String name)` Return the value of the specified node attribute if it exists, or `null` otherwise.
`java.util.Iterator` | `findAttributes()` Return an Iterator of the attribute names of this node.
`TreeNode` | `findChild(java.lang.String name)` Return the first child node of this node with the specified name, if there is one; otherwise, return `null`.
`java.util.Iterator` | `findChildren()` Return an Iterator of all children of this node.
`java.util.Iterator` | `findChildren(java.lang.String name)` Return an Iterator over all children of this node that have the specified name.
`java.lang.String` | `getBody()` Return the body text associated with this node (if any).
`java.lang.String` | `getName()` Return the name of this node.
`void` | `removeAttribute(java.lang.String name)` Remove any existing value for the specified attribute name.
`void` | `removeNode(TreeNode node)` Remove a child node from this node, if it is one.
`void` | `setBody(java.lang.String body)` Set the body text associated with this node (if any).
`java.lang.String` | `toString()` Return a String representation of this TreeNode.
`protected void` | `toString(java.lang.StringBuffer sb, int indent, TreeNode node)` Append to the specified StringBuffer a character representation of this node, with the specified amount of indentation.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### attributes

    protected java.util.HashMap attributes

  The attributes of this node, keyed by attribute name, Instantiated only if required.

### body

    protected java.lang.String body

  The body text associated with this node (if any).

### children

    protected java.util.ArrayList children

  The children of this node, instantiated only if required.

### name

    protected java.lang.String name

  The name of this node.

### parent

    protected TreeNode parent

  The parent node of this node.

Constructor Detail

### TreeNode

    public TreeNode(java.lang.String name)

  Construct a new node with no parent.
  Parameters:
    `name` - The name of this node

### TreeNode

    public TreeNode(java.lang.String name,
                    TreeNode parent)

  Construct a new node with the specified parent.
  Parameters:
    `name` - The name of this node
    `parent` - The node that is the parent of this node

Method Detail

### addAttribute

    public void addAttribute(java.lang.String name,
                             java.lang.String value)

  Add an attribute to this node, replacing any existing attribute with the same name.
  Parameters:
    `name` - The attribute name to add
    `value` - The new attribute value

### addChild

    public void addChild(TreeNode node)

  Add a new child node to this node.
  Parameters:
    `node` - The new child node

### findAttribute

    public java.lang.String findAttribute(java.lang.String name)

  Return the value of the specified node attribute if it exists, or `null` otherwise.
  Parameters:
    `name` - Name of the requested attribute

### findAttributes

    public java.util.Iterator findAttributes()

  Return an Iterator of the attribute names of this node. If there are no attributes, an empty Iterator is returned.

### findChild

    public TreeNode findChild(java.lang.String name)

  Return the first child node of this node with the specified name, if there is one; otherwise, return `null`.
  Parameters:
    `name` - Name of the desired child element

### findChildren

    public java.util.Iterator findChildren()

  Return an Iterator of all children of this node. If there are no children, an empty Iterator is returned.

### findChildren

    public java.util.Iterator findChildren(java.lang.String name)

  Return an Iterator over all children of this node that have the specified name. If there are no such children, an empty Iterator is returned.
  Parameters:
    `name` - Name used to select children

### getBody

    public java.lang.String getBody()

  Return the body text associated with this node (if any).

### getName

    public java.lang.String getName()

  Return the name of this node.

### removeAttribute

    public void removeAttribute(java.lang.String name)

  Remove any existing value for the specified attribute name.
  Parameters:
    `name` - The attribute name to remove

### removeNode

    public void removeNode(TreeNode node)

  Remove a child node from this node, if it is one.
  Parameters:
    `node` - The child node to remove

### setBody

    public void setBody(java.lang.String body)

  Set the body text associated with this node (if any).
  Parameters:
    `body` - The body text (if any)

### toString

    public java.lang.String toString()

  Return a String representation of this TreeNode.
  Overrides:
    `toString` in class `java.lang.Object`

### toString

    protected void toString(java.lang.StringBuffer sb,
                            int indent,
                            TreeNode node)

  Append to the specified StringBuffer a character representation of this node, with the specified amount of indentation.
  Parameters:
    `sb` - The StringBuffer to append to
    `indent` - Number of characters of indentation
    `node` - The TreeNode to be printed

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