File	Doc	Category	Size	Date	Package
XPath.java	API Doc	Java SE 5 API	12809	Fri Aug 26 14:58:24 BST 2005	javax.xml.xpath

XPath

Fields Summary

Constructors Summary

Methods Summary
public javax.xml.xpath.XPathExpression	compile(java.lang.String expression) Compile an XPath expression for later evaluation. If expression contains any {@link XPathFunction}s, they must be available via the {@link XPathFunctionResolver}. An {@link XPathExpressionException} will be thrown if the XPathFunction cannot be resovled with the XPathFunctionResolver. If expression is null, a NullPointerException is thrown. param expression The XPath expression. return Compiled XPath expression. throws XPathExpressionException If expression cannot be compiled. throws NullPointerException If expression is null.
public java.lang.String	evaluate(java.lang.String expression, java.lang.Object item) Evaluate an XPath expression in the specified context and return the result as a String. This method calls {@link #evaluate(String expression, Object item, QName returnType)} with a returnType of {@link XPathConstants#STRING}. See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion. If a null value is provided for item, an empty document will be used for the context. If expression is null, then a NullPointerException is thrown. param expression The XPath expression. param item The starting context (node or node list, for example). return The String that is the result of evaluating the expression and converting the result to a String. throws XPathExpressionException If expression cannot be evaluated. throws NullPointerException If expression is null.
public java.lang.Object	evaluate(java.lang.String expression, org.xml.sax.InputSource source, javax.xml.namespace.QName returnType) Evaluate an XPath expression in the context of the specified InputSource and return the result as the specified type. This method builds a data model for the {@link InputSource} and calls {@link #evaluate(String expression, Object item, QName returnType)} on the resulting document object. See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion. If returnType is not one of the types defined in {@link XPathConstants}, then an IllegalArgumentException is thrown. If expression, source or returnType is null, then a NullPointerException is thrown. param expression The XPath expression. param source The input source of the document to evaluate over. param returnType The desired return type. return The Object that encapsulates the result of evaluating the expression. throws XPathExpressionException If expression cannot be evaluated. throws IllegalArgumentException If returnType is not one of the types defined in {@link XPathConstants}. throws NullPointerException If expression, source or returnType is null.
public java.lang.String	evaluate(java.lang.String expression, org.xml.sax.InputSource source) Evaluate an XPath expression in the context of the specified InputSource and return the result as a String. This method calls {@link #evaluate(String expression, InputSource source, QName returnType)} with a returnType of {@link XPathConstants#STRING}. See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion. If expression or source is null, then a NullPointerException is thrown. param expression The XPath expression. param source The InputSource of the document to evaluate over. return The String that is the result of evaluating the expression and converting the result to a String. throws XPathExpressionException If expression cannot be evaluated. throws NullPointerException If expression or source is null.
public java.lang.Object	evaluate(java.lang.String expression, java.lang.Object item, javax.xml.namespace.QName returnType) Evaluate an XPath expression in the specified context and return the result as the specified type. See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion. If returnType is not one of the types defined in {@link XPathConstants} ( {@link XPathConstants#NUMBER NUMBER}, {@link XPathConstants#STRING STRING}, {@link XPathConstants#BOOLEAN BOOLEAN}, {@link XPathConstants#NODE NODE} or {@link XPathConstants#NODESET NODESET}) then an IllegalArgumentException is thrown. If a null value is provided for item, an empty document will be used for the context. If expression or returnType is null, then a NullPointerException is thrown. param expression The XPath expression. param item The starting context (node or node list, for example). param returnType The desired return type. return Result of evaluating an XPath expression as an Object of returnType. throws XPathExpressionException If expression cannot be evaluated. throws IllegalArgumentException If returnType is not one of the types defined in {@link XPathConstants}. throws NullPointerException If expression or returnType is null.
public javax.xml.namespace.NamespaceContext	getNamespaceContext() Return the current namespace context. null is returned in no namespace context is in effect. return Current Namespace context.
public javax.xml.xpath.XPathFunctionResolver	getXPathFunctionResolver() Return the current function resolver. null is returned in no function resolver is in effect. return Current function resolver.
public javax.xml.xpath.XPathVariableResolver	getXPathVariableResolver() Return the current variable resolver. null is returned in no variable resolver is in effect. return Current variable resolver.
public void	reset() Reset this XPath to its original configuration. XPath is reset to the same state as when it was created with {@link XPathFactory#newXPath()}. reset() is designed to allow the reuse of existing XPaths thus saving resources associated with the creation of new XPaths. The reset XPath is not guaranteed to have the same {@link XPathFunctionResolver}, {@link XPathVariableResolver} or {@link NamespaceContext} Objects, e.g. {@link Object#equals(Object obj)}. It is guaranteed to have a functionally equal XPathFunctionResolver, XPathVariableResolver and NamespaceContext.
public void	setNamespaceContext(javax.xml.namespace.NamespaceContext nsContext) Establish a namespace context. A NullPointerException is thrown if nsContext is null. param nsContext Namespace context to use. throws NullPointerException If nsContext is null.
public void	setXPathFunctionResolver(javax.xml.xpath.XPathFunctionResolver resolver) Establish a function resolver. A NullPointerException is thrown if resolver is null. param resolver XPath function resolver. throws NullPointerException If resolver is null.
public void	setXPathVariableResolver(javax.xml.xpath.XPathVariableResolver resolver) Establish a variable resolver. A NullPointerException is thrown if resolver is null. param resolver Variable resolver. throws NullPointerException If resolver is null.