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
    Modifier and Type | Class and Description
    --- | ---
    `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
    Modifier and Type | Method and Description
    --- | ---
    `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`