OpenJDK 27 · javax.xml.xpath.XPath · APIdia, the JavaDoc alternative

Evaluation of XPath Expressions
Factor	Behavior
context	The type of the context is implementation-dependent. If the value is null, the operation must have no dependency on the context, otherwise an XPathExpressionException will be thrown. For the purposes of evaluating XPath expressions, a DocumentFragment is treated like a Document node.
variables	If the expression contains a variable reference, its value will be found through the `XPathVariableResolver` set with `setXPathVariableResolver(XPathVariableResolver resolver)`. An `XPathExpressionException` is raised if the variable resolver is undefined or the resolver returns `null` for the variable. The value of a variable must be immutable through the course of any single evaluation.
functions	If the expression contains a function reference, the function will be found through the `XPathFunctionResolver` set with `setXPathFunctionResolver(XPathFunctionResolver resolver)`. An `XPathExpressionException` is raised if the function resolver is undefined or the function resolver returns `null` for the function.
QNames	QNames in the expression are resolved against the XPath namespace context set with `setNamespaceContext(NamespaceContext nsContext)`.
result	This result of evaluating an expression is converted to an instance of the desired return type. Valid return types are defined in `XPathConstants`. Conversion to the return type follows XPath conversion rules.

Method Summary

Modifier and Type	Method and Description
public XPathExpression	Returns: Compiled XPath expression. compile(String The XPath expression. expression) Compile an XPath expression for later evaluation.
public Object	Returns: The result of evaluating an XPath expression as an `Object` of `returnType`. evaluate(String The XPath expression. expression, Object The context the XPath expression will be evaluated in. item, QName The result type expected to be returned by the XPath expression. returnType) Evaluate an `XPath` expression in the specified context and return the result as the specified type.
public String	Returns: The result of evaluating an XPath expression as a `String`. evaluate(String The XPath expression. expression, Object The context the XPath expression will be evaluated in. item) Evaluate an XPath expression in the specified context and return the result as a `String`.
public Object	Returns: The `Object` that encapsulates the result of evaluating the expression. evaluate(String The XPath expression. expression, InputSource The input source of the document to evaluate over. source, QName The desired return type. returnType) Evaluate an XPath expression in the context of the specified `InputSource` and return the result as the specified type.
public String	Returns: The `String` that is the result of evaluating the expression and converting the result to a `String`. evaluate(String The XPath expression. expression, InputSource The `InputSource` of the document to evaluate over. source) Evaluate an XPath expression in the context of the specified `InputSource` and return the result as a `String`.
public default < The class type that will be returned by the XPath expression. T> T	Returns: The result of evaluating the expression. evaluateExpression(String The XPath expression. expression, Object The context the XPath expression will be evaluated in. item, Class<T> The class type expected to be returned by the XPath expression, must be one of the types described in section 3.2 Class types in the package summary. type) Evaluate an XPath expression in the specified context and return the result with the type specified through the `class type` The parameter `item` represents the context the XPath expression will be operated on.
public default XPathEvaluationResult<?>	Returns: The result of evaluating the expression. evaluateExpression(String The XPath expression. expression, Object The context the XPath expression will be evaluated in. item) Evaluate an XPath expression in the specified context.
public default < The class type that will be returned by the XPath expression. T> T	Returns: The result of evaluating the expression. evaluateExpression(String The XPath expression. expression, InputSource The input source of the document to evaluate over. source, Class<T> The class type expected to be returned by the XPath expression, must be one of the types described in section 3.2 Class types in the package summary. type) Evaluate an XPath expression in the context of the specified `source` and return the result as specified.
public default XPathEvaluationResult<?>	Returns: The result of evaluating the expression. evaluateExpression(String The XPath expression. expression, InputSource The input source of the document to evaluate over. source) Evaluate an XPath expression in the specified context.
public NamespaceContext	Returns: Current Namespace context. getNamespaceContext() Return the current namespace context.
public XPathFunctionResolver	Returns: Current function resolver. getXPathFunctionResolver() Return the current function resolver.
public XPathVariableResolver	Returns: Current variable resolver. getXPathVariableResolver() Return the current variable resolver.
public void	reset() Reset this `XPath` to its original configuration.
public void	setNamespaceContext(NamespaceContext Namespace context to use. nsContext) Establish a namespace context.
public void	setXPathFunctionResolver(XPathFunctionResolver XPath function resolver. resolver) Establish a function resolver.
public void	setXPathVariableResolver(XPathVariableResolver Variable resolver. resolver) Establish a variable resolver.

Method Detail

compile back to summary

compile	back to summary
public XPathExpression compile(String expression) throws XPathExpressionException Compile an XPath expression for later evaluation. If `expression` contains any `XPathFunction`s, they must be available via the `XPathFunctionResolver`. An `XPathExpressionException` will be thrown if the `XPathFunction` cannot be resovled with the `XPathFunctionResolver`. If `expression` contains any variables, the `XPathVariableResolver` in effect at compile time will be used to resolve them. Parameters expression:String The XPath expression. Returns:XPathExpression Compiled XPath expression. Exceptions XPathExpressionException: If `expression` cannot be compiled. NullPointerException: If `expression` is `null`.

public XPathExpression compile(String expression) throws XPathExpressionException

Compile an XPath expression for later evaluation.

If expression contains any XPathFunctions, they must be available via the XPathFunctionResolver. An XPathExpressionException will be thrown if the XPathFunction cannot be resovled with the XPathFunctionResolver.

If expression contains any variables, the XPathVariableResolver in effect at compile time will be used to resolve them.

Parameters

expression:String: The XPath expression.

Returns:XPathExpression

Compiled XPath expression.

Exceptions

XPathExpressionException:: If expression cannot be compiled.
NullPointerException:: If expression is null.

evaluate back to summary

evaluate	back to summary
public Object evaluate(String expression, Object item, QName returnType) throws XPathExpressionException 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. The parameter `item` represents the context the XPath expression will be operated on. The type of the context is implementation-dependent. If the value is `null`, the operation must have no dependency on the context, otherwise an XPathExpressionException will be thrown. Implementation Note The type of the context is usually `org.w3c.dom.Node`. Parameters expression:String The XPath expression. item:Object The context the XPath expression will be evaluated in. returnType:QName The result type expected to be returned by the XPath expression. Returns:Object The result of evaluating an XPath expression as an `Object` of `returnType`. Exceptions XPathExpressionException: If `expression` cannot be evaluated. IllegalArgumentException: If `returnType` is not one of the types defined in `XPathConstants` ( `NUMBER`, `STRING`, `BOOLEAN`, `NODE` or `NODESET`). NullPointerException: If `expression or returnType` is `null`.

public Object evaluate(String expression, Object item, QName returnType) throws XPathExpressionException

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.

The parameter item represents the context the XPath expression will be operated on. The type of the context is implementation-dependent. If the value is null, the operation must have no dependency on the context, otherwise an XPathExpressionException will be thrown.

Implementation Note

The type of the context is usually org.w3c.dom.Node.

Parameters

expression:String: The XPath expression.
item:Object: The context the XPath expression will be evaluated in.
returnType:QName: The result type expected to be returned by the XPath expression.

Returns:Object

The result of evaluating an XPath expression as an Object of returnType.

Exceptions

XPathExpressionException:: If expression cannot be evaluated.
IllegalArgumentException:: If returnType is not one of the types defined in XPathConstants ( NUMBER, STRING, BOOLEAN, NODE or NODESET).
NullPointerException:: If expression or returnType is null.

evaluate back to summary

evaluate	back to summary
public String evaluate(String expression, Object item) throws XPathExpressionException Evaluate an XPath expression in the specified context and return the result as a `String`. This method calls `evaluate(String expression, Object item, QName returnType)` with a `returnType` of `XPathConstants#STRING`. See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion. The parameter `item` represents the context the XPath expression will be operated on. The type of the context is implementation-dependent. If the value is `null`, the operation must have no dependency on the context, otherwise an XPathExpressionException will be thrown. Implementation Note The type of the context is usually `org.w3c.dom.Node`. Parameters expression:String The XPath expression. item:Object The context the XPath expression will be evaluated in. Returns:String The result of evaluating an XPath expression as a `String`. Exceptions XPathExpressionException: If `expression` cannot be evaluated. NullPointerException: If `expression` is `null`.

public String evaluate(String expression, Object item) throws XPathExpressionException

Evaluate an XPath expression in the specified context and return the result as a String.

This method calls evaluate(String expression, Object item, QName returnType) with a returnType of XPathConstants#STRING.

See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion.

Implementation Note

The type of the context is usually org.w3c.dom.Node.

Parameters

expression:String: The XPath expression.
item:Object: The context the XPath expression will be evaluated in.

Returns:String

The result of evaluating an XPath expression as a String.

Exceptions

XPathExpressionException:: If expression cannot be evaluated.
NullPointerException:: If expression is null.

evaluate back to summary

evaluate	back to summary
public Object evaluate(String expression, InputSource source, QName returnType) throws XPathExpressionException 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 `InputSource` and calls `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. Parameters expression:String The XPath expression. source:InputSource The input source of the document to evaluate over. returnType:QName The desired return type. Returns:Object The `Object` that encapsulates the result of evaluating the expression. Exceptions XPathExpressionException: If expression cannot be evaluated. IllegalArgumentException: If `returnType` is not one of the types defined in `XPathConstants`. NullPointerException: If `expression, source or returnType` is `null`.

public Object evaluate(String expression, InputSource source, QName returnType) throws XPathExpressionException

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 InputSource and calls 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.

Parameters

expression:String: The XPath expression.
source:InputSource: The input source of the document to evaluate over.
returnType:QName: The desired return type.

Returns:Object

The Object that encapsulates the result of evaluating the expression.

Exceptions

XPathExpressionException:: If expression cannot be evaluated.
IllegalArgumentException:: If returnType is not one of the types defined in XPathConstants.
NullPointerException:: If expression, source or returnType is null.

evaluate back to summary

evaluate	back to summary
public String evaluate(String expression, InputSource source) throws XPathExpressionException Evaluate an XPath expression in the context of the specified `InputSource` and return the result as a `String`. This method calls `evaluate(String expression, InputSource source, QName returnType)` with a `returnType` of `XPathConstants#STRING`. See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion. Parameters expression:String The XPath expression. source:InputSource The `InputSource` of the document to evaluate over. Returns:String The `String` that is the result of evaluating the expression and converting the result to a `String`. Exceptions XPathExpressionException: If expression cannot be evaluated. NullPointerException: If `expression or source` is `null`.

public String evaluate(String expression, InputSource source) throws XPathExpressionException

Evaluate an XPath expression in the context of the specified InputSource and return the result as a String.

This method calls evaluate(String expression, InputSource source, QName returnType) with a returnType of XPathConstants#STRING.

See Evaluation of XPath Expressions for context item evaluation, variable, function and QName resolution and return type conversion.

Parameters

expression:String: The XPath expression.
source:InputSource: The InputSource of the document to evaluate over.

Returns:String

The String that is the result of evaluating the expression and converting the result to a String.

Exceptions

XPathExpressionException:: If expression cannot be evaluated.
NullPointerException:: If expression or source is null.

evaluateExpression back to summary

evaluateExpression	back to summary
public default <T> T evaluateExpression(String expression, Object item, Class<T> type) throws XPathExpressionException Evaluate an XPath expression in the specified context and return the result with the type specified through the `class type` The parameter `item` represents the context the XPath expression will be operated on. The type of the context is implementation-dependent. If the value is `null`, the operation must have no dependency on the context, otherwise an XPathExpressionException will be thrown. Implementation Note The type of the context is usually `org.w3c.dom.Node`. Implementation Specification The default implementation in the XPath API is equivalent to: `(T)evaluate(expression, item, XPathEvaluationResult.XPathResultType.getQNameType(type));` Since the `evaluate` method does not support the `ANY` type, specifying XPathEvaluationResult as the type will result in IllegalArgumentException. Any implementation supporting the `ANY` type must override this method. Parameters <T> The class type that will be returned by the XPath expression. expression:String The XPath expression. item:Object The context the XPath expression will be evaluated in. type:Class<T> The class type expected to be returned by the XPath expression, must be one of the types described in section 3.2 Class types in the package summary. Returns:T The result of evaluating the expression. Exceptions XPathExpressionException: If the expression cannot be evaluated. IllegalArgumentException: If `type` is not of the types corresponding to the types defined in the `XPathEvaluationResult.XPathResultType`, or XPathEvaluationResult is specified as the type but an implementation supporting the `ANY` type is not available. NullPointerException: If `expression or type` is `null`. Since 9

public default <T> T evaluateExpression(String expression, Object item, Class<T> type) throws XPathExpressionException

Evaluate an XPath expression in the specified context and return the result with the type specified through the class type

Implementation Note

The type of the context is usually org.w3c.dom.Node.

Implementation Specification

The default implementation in the XPath API is equivalent to:

 (T)evaluate(expression, item,
          XPathEvaluationResult.XPathResultType.getQNameType(type));

Since the evaluate method does not support the ANY type, specifying XPathEvaluationResult as the type will result in IllegalArgumentException. Any implementation supporting the ANY type must override this method.

Parameters

<T>: The class type that will be returned by the XPath expression.
expression:String: The XPath expression.
item:Object: The context the XPath expression will be evaluated in.
type:Class<T>: The class type expected to be returned by the XPath expression, must be one of the types described in section 3.2 Class types in the package summary.

Returns:T

The result of evaluating the expression.

Exceptions

XPathExpressionException:: If the expression cannot be evaluated.
IllegalArgumentException:: If type is not of the types corresponding to the types defined in the XPathEvaluationResult.XPathResultType, or XPathEvaluationResult is specified as the type but an implementation supporting the ANY type is not available.
NullPointerException:: If expression or type is null.

Since

evaluateExpression back to summary

evaluateExpression	back to summary
public default XPathEvaluationResult<?> evaluateExpression(String expression, Object item) throws XPathExpressionException Evaluate an XPath expression in the specified context. This is equivalent to calling `evaluateExpression(String expression, Object item, Class type)` with type `XPathEvaluationResult`: `evaluateExpression(expression, item, XPathEvaluationResult.class);` The parameter `item` represents the context the XPath expression will be operated on. The type of the context is implementation-dependent. If the value is `null`, the operation must have no dependency on the context, otherwise an XPathExpressionException will be thrown. Implementation Note The type of the context is usually `org.w3c.dom.Node`. Implementation Specification The default implementation in the XPath API is equivalent to: `evaluateExpression(expression, item, XPathEvaluationResult.class);` Since the `evaluate` method does not support the `ANY` type, the default implementation of this method will always throw an IllegalArgumentException. Any implementation supporting the `ANY` type must therefore override this method. Parameters expression:String The XPath expression. item:Object The context the XPath expression will be evaluated in. Returns:XPathEvaluationResult<?> The result of evaluating the expression. Exceptions XPathExpressionException: If the expression cannot be evaluated. IllegalArgumentException: If the implementation of this method does not support the `ANY` type. NullPointerException: If `expression` is `null`. Since 9

public default XPathEvaluationResult<?> evaluateExpression(String expression, Object item) throws XPathExpressionException

Evaluate an XPath expression in the specified context. This is equivalent to calling evaluateExpression(String expression, Object item, Class type) with type XPathEvaluationResult:

 evaluateExpression(expression, item, XPathEvaluationResult.class);

Implementation Note

The type of the context is usually org.w3c.dom.Node.

Implementation Specification

The default implementation in the XPath API is equivalent to:

 evaluateExpression(expression, item, XPathEvaluationResult.class);

Since the evaluate method does not support the ANY type, the default implementation of this method will always throw an IllegalArgumentException. Any implementation supporting the ANY type must therefore override this method.

Parameters

expression:String: The XPath expression.
item:Object: The context the XPath expression will be evaluated in.

Returns:XPathEvaluationResult<?>

The result of evaluating the expression.

Exceptions

XPathExpressionException:: If the expression cannot be evaluated.
IllegalArgumentException:: If the implementation of this method does not support the ANY type.
NullPointerException:: If expression is null.

Since

evaluateExpression back to summary

evaluateExpression	back to summary
public default <T> T evaluateExpression(String expression, InputSource source, Class<T> type) throws XPathExpressionException Evaluate an XPath expression in the context of the specified `source` and return the result as specified. This method builds a data model for the `InputSource` and calls `evaluateExpression(String expression, Object item, Class type)` on the resulting document object. The data model is usually `org.w3c.dom.Document` Implementation Specification The default implementation in the XPath API is equivalent to: `(T)evaluate(expression, source, XPathEvaluationResult.XPathResultType.getQNameType(type));` Since the `evaluate` method does not support the `ANY` type, specifying XPathEvaluationResult as the type will result in IllegalArgumentException. Any implementation supporting the `ANY` type must override this method. Parameters <T> The class type that will be returned by the XPath expression. expression:String The XPath expression. source:InputSource The input source of the document to evaluate over. type:Class<T> The class type expected to be returned by the XPath expression, must be one of the types described in section 3.2 Class types in the package summary. Returns:T The result of evaluating the expression. Exceptions XPathExpressionException: If the expression cannot be evaluated. IllegalArgumentException: If `type` is not of the types corresponding to the types defined in the `XPathResultType`, or XPathEvaluationResult is specified as the type but an implementation supporting the `ANY` type is not available. NullPointerException: If `expression, source or type`is `null`. Since 9

public default <T> T evaluateExpression(String expression, InputSource source, Class<T> type) throws XPathExpressionException

Evaluate an XPath expression in the context of the specified source and return the result as specified.

This method builds a data model for the InputSource and calls evaluateExpression(String expression, Object item, Class type) on the resulting document object. The data model is usually org.w3c.dom.Document

Implementation Specification

The default implementation in the XPath API is equivalent to:

 (T)evaluate(expression, source,
               XPathEvaluationResult.XPathResultType.getQNameType(type));

Parameters

<T>: The class type that will be returned by the XPath expression.
expression:String: The XPath expression.
source:InputSource: The input source of the document to evaluate over.
type:Class<T>: The class type expected to be returned by the XPath expression, must be one of the types described in section 3.2 Class types in the package summary.

Returns:T

The result of evaluating the expression.

Exceptions

XPathExpressionException:: If the expression cannot be evaluated.
IllegalArgumentException:: If type is not of the types corresponding to the types defined in the XPathResultType, or XPathEvaluationResult is specified as the type but an implementation supporting the ANY type is not available.
NullPointerException:: If expression, source or typeis null.

Since

evaluateExpression back to summary

evaluateExpression	back to summary
public default XPathEvaluationResult<?> evaluateExpression(String expression, InputSource source) throws XPathExpressionException Evaluate an XPath expression in the specified context. This is equivalent to calling `evaluateExpression(String expression, Object item, Class type)` with type `XPathEvaluationResult`: `evaluateExpression(expression, item, XPathEvaluationResult.class);` Implementation Specification The default implementation in the XPath API is equivalent to: `evaluateExpression(expression, source, XPathEvaluationResult.class);` Since the `evaluate` method does not support the `ANY` type, the default implementation of this method will always throw an IllegalArgumentException. Any implementation supporting the `ANY` type must therefore override this method. Parameters expression:String The XPath expression. source:InputSource The input source of the document to evaluate over. Returns:XPathEvaluationResult<?> The result of evaluating the expression. Exceptions XPathExpressionException: If the expression cannot be evaluated. IllegalArgumentException: If the implementation of this method does not support the `ANY` type. NullPointerException: If `expression or source` is `null`. Since 9

public default XPathEvaluationResult<?> evaluateExpression(String expression, InputSource source) throws XPathExpressionException

Evaluate an XPath expression in the specified context. This is equivalent to calling evaluateExpression(String expression, Object item, Class type) with type XPathEvaluationResult:

 evaluateExpression(expression, item, XPathEvaluationResult.class);

Implementation Specification

The default implementation in the XPath API is equivalent to:

 evaluateExpression(expression, source, XPathEvaluationResult.class);

Parameters

expression:String: The XPath expression.
source:InputSource: The input source of the document to evaluate over.

Returns:XPathEvaluationResult<?>

The result of evaluating the expression.

Exceptions

XPathExpressionException:: If the expression cannot be evaluated.
IllegalArgumentException:: If the implementation of this method does not support the ANY type.
NullPointerException:: If expression or source is null.

Since

getNamespaceContext back to summary

getNamespaceContext	back to summary
public NamespaceContext getNamespaceContext() Return the current namespace context. `null` is returned in no namespace context is in effect. Returns:NamespaceContext Current Namespace context.

public NamespaceContext getNamespaceContext()

Return the current namespace context.

null is returned in no namespace context is in effect.

Returns:NamespaceContext: Current Namespace context.

getXPathFunctionResolver back to summary

getXPathFunctionResolver	back to summary
public XPathFunctionResolver getXPathFunctionResolver() Return the current function resolver. `null` is returned in no function resolver is in effect. Returns:XPathFunctionResolver Current function resolver.

public XPathFunctionResolver getXPathFunctionResolver()

Return the current function resolver.

null is returned in no function resolver is in effect.

Returns:XPathFunctionResolver: Current function resolver.

getXPathVariableResolver back to summary

getXPathVariableResolver	back to summary
public XPathVariableResolver getXPathVariableResolver() Return the current variable resolver. `null` is returned in no variable resolver is in effect. Returns:XPathVariableResolver Current variable resolver.

public XPathVariableResolver getXPathVariableResolver()

Return the current variable resolver.

null is returned in no variable resolver is in effect.

Returns:XPathVariableResolver: Current variable resolver.

reset back to summary

reset	back to summary
public void reset() Reset this `XPath` to its original configuration. `XPath` is reset to the same state as when it was created with `XPathFactory#newXPath()`. `reset()` is designed to allow the reuse of existing `XPath`s thus saving resources associated with the creation of new `XPath`s. The reset `XPath` is not guaranteed to have the same `XPathFunctionResolver`, `XPathVariableResolver` or `NamespaceContext` `Object`s, e.g. `Object#equals(Object obj)`. It is guaranteed to have a functionally equal `XPathFunctionResolver`, `XPathVariableResolver` and `NamespaceContext`.

public void reset()

Reset this XPath to its original configuration.

XPath is reset to the same state as when it was created with 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 XPathFunctionResolver, XPathVariableResolver or NamespaceContext Objects, e.g. Object#equals(Object obj). It is guaranteed to have a functionally equal XPathFunctionResolver, XPathVariableResolver and NamespaceContext.

setNamespaceContext back to summary

setNamespaceContext	back to summary
public void setNamespaceContext(NamespaceContext nsContext) Establish a namespace context. A `NullPointerException` is thrown if `nsContext` is `null`. Parameters nsContext:NamespaceContext Namespace context to use. Exceptions NullPointerException: If `nsContext` is `null`.

public void setNamespaceContext(NamespaceContext nsContext)

Establish a namespace context.

A NullPointerException is thrown if nsContext is null.

Parameters

nsContext:NamespaceContext: Namespace context to use.

Exceptions

NullPointerException:: If nsContext is null.

setXPathFunctionResolver back to summary

setXPathFunctionResolver	back to summary
public void setXPathFunctionResolver(XPathFunctionResolver resolver) Establish a function resolver. A `NullPointerException` is thrown if `resolver` is `null`. Parameters resolver:XPathFunctionResolver XPath function resolver. Exceptions NullPointerException: If `resolver` is `null`.

public void setXPathFunctionResolver(XPathFunctionResolver resolver)

Establish a function resolver.

A NullPointerException is thrown if resolver is null.

Parameters

resolver:XPathFunctionResolver: XPath function resolver.

Exceptions

NullPointerException:: If resolver is null.

setXPathVariableResolver back to summary

setXPathVariableResolver	back to summary
public void setXPathVariableResolver(XPathVariableResolver resolver) Establish a variable resolver. A `NullPointerException` is thrown if `resolver` is `null`. Parameters resolver:XPathVariableResolver Variable resolver. Exceptions NullPointerException: If `resolver` is `null`.

public void setXPathVariableResolver(XPathVariableResolver resolver)

Establish a variable resolver.

A NullPointerException is thrown if resolver is null.

Parameters

resolver:XPathVariableResolver: Variable resolver.

Exceptions

NullPointerException:: If resolver is null.

public Interface XPath

Method Summary

Method Detail