Package de.elrebo

Class XPathHelper

java.lang.Object

de.elrebo.XPathHelper

public class XPathHelper
extends Object

Class XPathHelper simplifies Access to XML documents from Java programs. It evaluates an XPath expression against an XdmNode.

Copyright 2025 Christoph Oberle

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Constructor Summary

Constructors

Constructor	Description
XPathHelper(net.sf.saxon.s9api.Processor processor, String[][] namespaces, String[][] variables, String xPath)	Constructor from processor, filePath, namespaces, variables and xPath

Method Summary

Modifier and Type	Method	Description
void	loadXPath()	load xPath Executable into selector
net.sf.saxon.s9api.XPathSelector	setContextItem(net.sf.saxon.s9api.XdmNode xdmNode)	set the context for the XPath evaluation to an XdmNode containing the XML document
void	setDoubleVariable(String name, double value)	set a double variable
void	setIntVariable(String name, int value)	set an int variable
void	setStringVariable(String name, String value)	set a String variable

Methods inherited from class java.lang.Object

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

Constructor Details

XPathHelper

public XPathHelper(net.sf.saxon.s9api.Processor processor,
 String[][] namespaces,
 String[][] variables,
 String xPath)
            throws net.sf.saxon.s9api.SaxonApiException

Constructor from processor, filePath, namespaces, variables and xPath

Parameters:

processor - the Saxon processor

namespaces - the mapping of namespace prefixes to namespaces

variables - the list of variables (names and types)

xPath - the XPath expression

Throws:

net.sf.saxon.s9api.SaxonApiException - if an error occurs

Method Details

loadXPath

public void loadXPath()

load xPath Executable into selector

setIntVariable

public void setIntVariable(String name,
 int value)
                    throws net.sf.saxon.s9api.SaxonApiException

set an int variable

Parameters:

name - the name of the variable

value - the int value for the variable

Throws:

net.sf.saxon.s9api.SaxonApiException - if the variable can't be set

setDoubleVariable

public void setDoubleVariable(String name,
 double value)
                       throws net.sf.saxon.s9api.SaxonApiException

set a double variable

Parameters:

name - the name of the variable

value - the double value for the variable

Throws:

net.sf.saxon.s9api.SaxonApiException - if the variable can't be set

setStringVariable

public void setStringVariable(String name,
 String value)
                       throws net.sf.saxon.s9api.SaxonApiException

set a String variable

Parameters:

name - the name of the variable

value - the String value for the variable

Throws:

net.sf.saxon.s9api.SaxonApiException - if the variable can't be set

setContextItem

public net.sf.saxon.s9api.XPathSelector setContextItem(net.sf.saxon.s9api.XdmNode xdmNode)
                                                throws net.sf.saxon.s9api.SaxonApiException

set the context for the XPath evaluation to an XdmNode containing the XML document

Parameters:

xdmNode - the XdmNode containing the XML document

Returns:

XPathSelector the selector for the XPath evaluation results

Throws:

net.sf.saxon.s9api.SaxonApiException - if an error occurs