bboss.org.apache.velocity.anakia

类 XPathTool

java.lang.Object

bboss.org.apache.velocity.anakia.XPathTool

public class XPathTool
extends java.lang.Object

This class adds an entrypoint into XPath functionality, for Anakia.

All methods take a string XPath specification, along with a context, and produces a resulting java.util.List.

The W3C XPath Specification (http://www.w3.org/TR/xpath) refers to NodeSets repeatedly, but this implementation simply uses java.util.List to hold all Nodes. A 'Node' is any object in a JDOM object tree, such as an org.jdom.Element, org.jdom.Document, or org.jdom.Attribute.

To use it in Velocity, do this:

 #set $authors = $xpath.applyTo("document/author", $root)
 #foreach ($author in $authors)
   $author.getValue()
 #end
 #set $chapterTitles = $xpath.applyTo("document/chapter/@title", $root)
 #foreach ($title in $chapterTitles)
   $title.getValue()
 #end
 

In newer Anakia builds, this class is obsoleted in favor of calling selectNodes() on the element directly:

 #set $authors = $root.selectNodes("document/author")
 #foreach ($author in $authors)
   $author.getValue()
 #end
 #set $chapterTitles = $root.selectNodes("document/chapter/@title")
 #foreach ($title in $chapterTitles)
   $title.getValue()
 #end
 

构造器概要

构造器

构造器和说明
XPathTool() Constructor does nothing, as this is mostly just objectified static methods

方法概要

限定符和类型	方法和说明
NodeList	applyTo(java.lang.String xpathSpec, org.jdom.Document doc) Apply an XPath to a JDOM Document
NodeList	applyTo(java.lang.String xpathSpec, org.jdom.Element elem) Apply an XPath to a JDOM Element
NodeList	applyTo(java.lang.String xpathSpec, java.util.List nodeSet) Apply an XPath to a nodeset

从类继承的方法 java.lang.Object

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

构造器详细资料

XPathTool

public XPathTool()

Constructor does nothing, as this is mostly just objectified static methods

方法详细资料

applyTo

public NodeList applyTo(java.lang.String xpathSpec,
                        org.jdom.Document doc)

Apply an XPath to a JDOM Document

参数:

xpathSpec - The XPath to apply

doc - The Document context

返回:

A list of selected nodes

applyTo

public NodeList applyTo(java.lang.String xpathSpec,
                        org.jdom.Element elem)

Apply an XPath to a JDOM Element

参数:

xpathSpec - The XPath to apply

elem - The Element context

返回:

A list of selected nodes

applyTo

public NodeList applyTo(java.lang.String xpathSpec,
                        java.util.List nodeSet)

Apply an XPath to a nodeset

参数:

xpathSpec - The XPath to apply

nodeSet - The nodeset context

返回:

A list of selected nodes