org.apache.tools.ant.taskdefs.optional.junit

## Class DOMUtil

- java.lang.Object
- - org.apache.tools.ant.taskdefs.optional.junit.DOMUtil

    public final class DOMUtil
    extends java.lang.Object

Some utilities that might be useful when manipulating DOM trees.

### Nested Class Summary

Nested Classes
`static interface` `DOMUtil.NodeFilter` Filter interface to be applied when iterating over a DOM tree.
`static class` `DOMUtil.NodeListImpl` custom implementation of a nodelist

### Method Summary

Methods
`static org.w3c.dom.Element` `getChildByTagName(org.w3c.dom.Node parent, java.lang.String tagname)` Iterate over the children of a given node and return the first node that has a specific name.
`static java.lang.String` `getNodeAttribute(org.w3c.dom.Node node, java.lang.String name)` return the attribute value of an element.
`static org.w3c.dom.Node` `importNode(org.w3c.dom.Node parent, org.w3c.dom.Node child)` Simple tree walker that will clone recursively a node.
`static org.w3c.dom.NodeList` `listChildNodes(org.w3c.dom.Node parent, DOMUtil.NodeFilter filter, boolean recurse)` list a set of node that match a specific filter.

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

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

### Method Detail

#### listChildNodes

    public static org.w3c.dom.NodeList listChildNodes(org.w3c.dom.Node parent,
                                      DOMUtil.NodeFilter filter,
                                      boolean recurse)

list a set of node that match a specific filter. The list can be made recursively or not.

Parameters:
  `parent` - the parent node to search from
  `filter` - the filter that children should match.
  `recurse` - `true` if you want the list to be made recursively otherwise `false`.
Returns:
  the node list that matches the filter.

#### getNodeAttribute

    public static java.lang.String getNodeAttribute(org.w3c.dom.Node node,
                                    java.lang.String name)

return the attribute value of an element.

Parameters:
  `node` - the node to get the attribute from.
  `name` - the name of the attribute we are looking for the value.
Returns:
  the value of the requested attribute or `null` if the attribute was not found or if `node` is not an `Element`.

#### getChildByTagName

    public static org.w3c.dom.Element getChildByTagName(org.w3c.dom.Node parent,
                                        java.lang.String tagname)

Iterate over the children of a given node and return the first node that has a specific name.

Parameters:
  `parent` - the node to search child from. Can be `null`.
  `tagname` - the child name we are looking for. Cannot be `null`.
Returns:
  the first child that matches the given name or `null` if the parent is `null` or if a child does not match the given name.

#### importNode

    public static org.w3c.dom.Node importNode(org.w3c.dom.Node parent,
                              org.w3c.dom.Node child)

Simple tree walker that will clone recursively a node. This is to avoid using parser-specific API such as Sun's `changeNodeOwner` when we are dealing with DOM L1 implementations since `cloneNode(boolean)` will not change the owner document. `changeNodeOwner` is much faster and avoid the costly cloning process. `importNode` is in the DOM L2 interface.

Parameters:
  `parent` - the node parent to which we should do the import to.
  `child` - the node to clone recursively. Its clone will be appended to `parent`.
Returns:
  the cloned node that is appended to `parent`