XPathFactory


XPathFactory javax.xml.xpath

Java 5.0

The XPathFactory class is a factory for creating XPath expression evaluators . Call the no-argument version of newInstance( ) to obtain an XPathFactory object that creates XPath object to work with DOM documents. The javax.xml.xpath package is nominally object-model independent, however, and you can specify the name of a different object model by calling the one-argument version of newInstance( ) .

Once you have created an XPathFactory object, you can set default function and variable resolvers with setXPathFunctionResolver( ) and setXPathVariableResolver( ) . You can configure implementation-dependent features of an XPathFactory with setFeature( ) . All implementations are required to support the XMLConstants.FEATURE_SECURE_PROCESSING feature. When this feature is set to true, external functions are not allowed in XPath expressions, and the XPathFunctionResolver is not used.

After creating and configuring an XPathFactory object, use the newXPath( ) method to create one or more XPath objects for actually evaluating XPath expressions.

 public abstract class  XPathFactory  {  // Protected Constructors  protected  XPathFactory  ( );  // Public Constants  public static final String  DEFAULT_OBJECT_MODEL_URI  ;  =  "http://java.sun.com/jaxp/xpath/dom"      public static final String  DEFAULT_PROPERTY_NAME  ;  =  "javax.xml.xpath.XPathFactory"  // Public Class Methods  public static final XPathFactory  newInstance  ( );        public static final XPathFactory  newInstance  (String  uri  )           throws XPathFactoryConfigurationException;  // Public Instance Methods  public abstract boolean  getFeature  (String  name  )          throws XPathFactoryConfigurationException;        public abstract boolean  isObjectModelSupported  (String  objectModel  );        public abstract XPath  newXPath  ( );        public abstract void  setFeature  (String  name  , boolean  value  )          throws XPathFactoryConfigurationException;        public abstract void  setXPathFunctionResolver  (XPathFunctionResolver  resolver  );        public abstract void  setXPathVariableResolver  (XPathVariableResolver  resolver  );   } 



Java In A Nutshell
Java In A Nutshell, 5th Edition
ISBN: 0596007736
EAN: 2147483647
Year: 2004
Pages: 1220

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