Package org.loboevolution.html.dom.xpath

Class XPathEvaluatorImpl

java.lang.Object
org.loboevolution.html.dom.xpath.XPathEvaluatorImpl
All Implemented Interfaces:
XPathEvaluator
public final class XPathEvaluatorImpl extends Object implements XPathEvaluator

XPathEvaluatorImpl class.

  • Constructor Details

    • XPathEvaluatorImpl

      public XPathEvaluatorImpl(Document doc)
      Constructor for XPathEvaluatorImpl.
      Parameters:
      doc - The document to be searched, to parallel the case where'' the XPathEvaluator is obtained by casting the document.

  • Method Details

    • createExpression

      public XPathExpression createExpression(String expression, XPathNSResolver resolver) throws XPathException, DOMException
      Creates a parsed XPath expression with resolved namespaces. This is useful when an expression will be reused in an application since it makes it possible to compile the expression string into a more efficient internal form and preresolve all namespace prefixes which occur within the expression.
      Specified by:
      createExpression in interface XPathEvaluator
      Parameters:
      expression - The XPath expression string to be parsed.
      resolver - The resolver permits translation of prefixes within the XPath expression into appropriate namespace URIs . If this is specified as null, any namespace prefix within the expression will result in DOMException being thrown with the code NAMESPACE_ERR.
      Returns:
      The compiled form of the XPath expression.
      Throws:
      XPathException - INVALID_EXPRESSION_ERR: Raised if the expression is not legal according to the rules of the XPathEvaluatori
      XPathException - if any.
      XPathException - if any.
      DOMException

    • createNSResolver

      public XPathNSResolver createNSResolver(Node nodeResolver)
      Adapts any DOM node to resolve namespaces so that an XPath expression can be easily evaluated relative to the context of the node where it appeared within the document. This adapter works like the DOM Level 3 method lookupNamespaceURI on nodes in resolving the namespaceURI from a given prefix using the current information available in the node's hierarchy at the time lookupNamespaceURI is called. also correctly resolving the implicit xml prefix.
      Specified by:
      createNSResolver in interface XPathEvaluator
      Parameters:
      nodeResolver - The node to be used as a context for namespace resolution.
      Returns:
      XPathNSResolver which resolves namespaces with respect to the definitions in scope for a specified node.

    • evaluate

      public Object evaluate(String expression, Node contextNode, XPathNSResolver resolver, short type, Object result) throws XPathException, DOMException
      Evaluates an XPath expression string and returns a result of the specified type if possible.
      Specified by:
      evaluate in interface XPathEvaluator
      Parameters:
      expression - The XPath expression string to be parsed and evaluated.
      contextNode - The context is context node for the evaluation of this XPath expression. If the XPathEvaluator was obtained by casting the Document then this must be owned by the same document and must be a Document, Element, Attribute, Text, CDATASection, Comment, ProcessingInstruction, or XPathNamespace node. If the context node is a Text or a CDATASection, then the context is interpreted as the whole logical text node as seen by XPath, unless the node is empty in which case it may not serve as the XPath context.
      resolver - The resolver permits translation of prefixes within the XPath expression into appropriate namespace URIs . If this is specified as null, any namespace prefix within the expression will result in DOMException being thrown with the code NAMESPACE_ERR.
      type - If a specific type is specified, then the result will be returned as the corresponding type.For XPath 1.0 results, this must be one of the codes of the XPathResult interface.
      result - The result specifies a specific result object which may be reused and returned by this method. If this is specified as nullor the implementation does not reuse the specified result, a new result object will be constructed and returned.For XPath 1.0 results, this object will be of type XPathResult.
      Returns:
      The result of the evaluation of the XPath expression.For XPath 1.0 results, this object will be of type XPathResult.
      Throws:
      XPathException - INVALID_EXPRESSION_ERR: Raised if the expression is not legal according to the rules of the XPathEvaluatori
      TYPE_ERR: Raised if the result cannot be converted to return the specified type.
      XPathException - if any.
      XPathException - if any.
      DOMException