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

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

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.

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 final 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