org.springframework.xml.xpath

Class JaxenXPathTemplate

java.lang.Object

org.springframework.xml.transform.TransformerObjectSupport

org.springframework.xml.xpath.AbstractXPathTemplate

org.springframework.xml.xpath.JaxenXPathTemplate

All Implemented Interfaces:

XPathOperations

public class JaxenXPathTemplate
extends AbstractXPathTemplate

Implementation of XPathOperations that uses Jaxen.

Namespaces can be set using the namespaces property.

Since:

1.0.0

Author:

Arjen Poutsma

See Also:

Jaxen

Field Summary

Fields inherited from class org.springframework.xml.transform.TransformerObjectSupport

logger

Constructor Summary

Constructors

Constructor and Description
JaxenXPathTemplate()

Method Summary

Modifier and Type	Method and Description
<T> List<T>	evaluate(String expression, Source context, NodeMapper<T> nodeMapper) Evaluates the given expression, mapping each result Node objects to a Java object via a NodeMapper.
boolean	evaluateAsBoolean(String expression, Source context) Evaluates the given expression as a boolean.
double	evaluateAsDouble(String expression, Source context) Evaluates the given expression as a double.
Node	evaluateAsNode(String expression, Source context) Evaluates the given expression as a Node.
List<Node>	evaluateAsNodeList(String expression, Source context) Evaluates the given expression as a list of Node objects.
<T> T	evaluateAsObject(String expression, Source context, NodeMapper<T> nodeMapper) Evaluates the given expression, mapping a single Node result to a Java object via a NodeMapper.
String	evaluateAsString(String expression, Source context) Evaluates the given expression as a String.

Methods inherited from class org.springframework.xml.xpath.AbstractXPathTemplate

evaluate, getNamespaces, getRootElement, setNamespaces

Methods inherited from class org.springframework.xml.transform.TransformerObjectSupport

createTransformer, getTransformerFactory, newTransformerFactory, setTransformerFactoryClass, transform

Methods inherited from class java.lang.Object

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

Constructor Detail

JaxenXPathTemplate

public JaxenXPathTemplate()

Method Detail

evaluateAsBoolean

public boolean evaluateAsBoolean(String expression,
                                 Source context)
                          throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression as a boolean. Returns the boolean evaluation of the expression, or false if it is invalid.

The return value is determined per the boolean() function defined in the XPath specification. This means that an expression that selects zero nodes will return false, while an expression that selects one or more nodes will return true. An expression that returns a string returns false for empty strings and true for all other strings. An expression that returns a number returns false for zero and true for non-zero numbers.

Parameters:

expression - the XPath expression

context - the context starting point

Returns:

the result of the evaluation

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification - boolean() function

evaluateAsNode

public Node evaluateAsNode(String expression,
                           Source context)
                    throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression as a Node. Returns the evaluation of the expression, or null if it is invalid.

Parameters:

expression - the XPath expression

context - the context starting point

Returns:

the result of the evaluation

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification

evaluateAsNodeList

public List<Node> evaluateAsNodeList(String expression,
                                     Source context)
                              throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression as a list of Node objects. Returns the evaluation of the expression, or an empty list if no results are found.

Parameters:

expression - the XPath expression

context - the context starting point

Returns:

the result of the evaluation

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification

evaluateAsDouble

public double evaluateAsDouble(String expression,
                               Source context)
                        throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression as a double. Returns the evaluation of the expression, or Double.NaN if it is invalid.

The return value is determined per the number() function as defined in the XPath specification. This means that if the expression selects multiple nodes, it will return the number value of the first node.

Parameters:

expression - the XPath expression

context - the context starting point

Returns:

the result of the evaluation

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification - number() function

evaluateAsString

public String evaluateAsString(String expression,
                               Source context)
                        throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression as a String. Returns the evaluation of the expression, or null if it is invalid.

The return value is determined per the string() function as defined in the XPath specification. This means that if the expression selects multiple nodes, it will return the string value of the first node.

Parameters:

expression - the XPath expression

context - the context starting point

Returns:

the result of the evaluation

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification - string() function

evaluateAsObject

public <T> T evaluateAsObject(String expression,
                              Source context,
                              NodeMapper<T> nodeMapper)
                       throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression, mapping a single Node result to a Java object via a NodeMapper.

Parameters:

expression - the XPath expression

context - the context starting point

nodeMapper - object that will map one object per node

Returns:

the single mapped object

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification

evaluate

public <T> List<T> evaluate(String expression,
                            Source context,
                            NodeMapper<T> nodeMapper)
                     throws XPathException

Description copied from interface: XPathOperations

Evaluates the given expression, mapping each result Node objects to a Java object via a NodeMapper.

Parameters:

expression - the XPath expression

context - the context starting point

nodeMapper - object that will map one object per node

Returns:

the result list, containing mapped objects

Throws:

XPathException - in case of XPath errors

See Also:

XPath specification