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java.lang.Objectorg.apache.xpath.jaxp.XPathExpressionImpl
public class XPathExpressionImpl
The XPathExpression interface encapsulates a (compiled) XPath expression.
Method Summary | |
---|---|
java.lang.Object |
eval(java.lang.Object item,
javax.xml.namespace.QName returnType)
|
java.lang.String |
evaluate(org.xml.sax.InputSource source)
Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as a
String . |
java.lang.Object |
evaluate(org.xml.sax.InputSource source,
javax.xml.namespace.QName returnType)
Evaluate the compiled XPath expression in the context of the specified InputSource and return the result as the
specified type. |
java.lang.String |
evaluate(java.lang.Object item)
Evaluate the compiled XPath expression in the specified context and return the result as a String . |
java.lang.Object |
evaluate(java.lang.Object item,
javax.xml.namespace.QName returnType)
Evaluate the compiled XPath expression in the specified context and return the result as the specified type. |
void |
setXPath(XPath xpath)
|
Methods inherited from class java.lang.Object |
---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public void setXPath(XPath xpath)
public java.lang.Object eval(java.lang.Object item, javax.xml.namespace.QName returnType) throws javax.xml.transform.TransformerException
javax.xml.transform.TransformerException
public java.lang.Object evaluate(java.lang.Object item, javax.xml.namespace.QName returnType) throws javax.xml.xpath.XPathExpressionException
Evaluate the compiled XPath expression in the specified context and return the result as the specified type.
See "Evaluation of XPath Expressions" section of JAXP 1.3 spec for context item evaluation, variable, function and QName resolution and return type conversion.
If returnType
is not one of the types defined
in XPathConstants
,
then an IllegalArgumentException
is thrown.
If a null
value is provided for
item
, an empty document will be used for the
context.
If returnType
is null
, then a
NullPointerException
is thrown.
evaluate
in interface javax.xml.xpath.XPathExpression
item
- The starting context (node or node list, for example).returnType
- The desired return type.
Object
that is the result of evaluating the
expression and converting the result to
returnType
.
javax.xml.xpath.XPathExpressionException
- If the expression cannot be evaluated.
java.lang.IllegalArgumentException
- If returnType
is not one
of the types defined in XPathConstants
.
java.lang.NullPointerException
- If returnType
is
null
.public java.lang.String evaluate(java.lang.Object item) throws javax.xml.xpath.XPathExpressionException
Evaluate the compiled XPath expression in the specified context and
return the result as a String
.
This method calls evaluate(Object item, QName returnType)
with a returnType
of
XPathConstants.STRING
.
See "Evaluation of XPath Expressions" section of JAXP 1.3 spec 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.
evaluate
in interface javax.xml.xpath.XPathExpression
item
- The starting context (node or node list, for example).
String
that is the result of evaluating the
expression and converting the result to a
String
.
javax.xml.xpath.XPathExpressionException
- If the expression cannot be evaluated.public java.lang.Object evaluate(org.xml.sax.InputSource source, javax.xml.namespace.QName returnType) throws javax.xml.xpath.XPathExpressionException
Evaluate the compiled 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(Object item, QName returnType)
on the resulting
document object.
See "Evaluation of XPath Expressions" section of JAXP 1.3 spec for context item evaluation, variable, function and QName resolution and return type conversion.
If returnType
is not one of the types defined in
XPathConstants
,
then an IllegalArgumentException
is thrown.
If source
or returnType
is null
,
then a NullPointerException
is thrown.
evaluate
in interface javax.xml.xpath.XPathExpression
source
- The InputSource
of the document to evaluate
over.returnType
- The desired return type.
Object
that is the result of evaluating the
expression and converting the result to
returnType
.
javax.xml.xpath.XPathExpressionException
- If the expression cannot be evaluated.
java.lang.IllegalArgumentException
- If returnType
is not one
of the types defined in XPathConstants
.
java.lang.NullPointerException
- If source
or
returnType
is null
.public java.lang.String evaluate(org.xml.sax.InputSource source) throws javax.xml.xpath.XPathExpressionException
Evaluate the compiled XPath expression in the context of the specified InputSource
and return the result as a
String
.
This method calls evaluate(InputSource source, QName returnType)
with a returnType
of
XPathConstants.STRING
.
See "Evaluation of XPath Expressions" section of JAXP 1.3 spec for context item evaluation, variable, function and QName resolution and return type conversion.
If source
is null
, then a NullPointerException
is thrown.
evaluate
in interface javax.xml.xpath.XPathExpression
source
- The InputSource
of the document to evaluate over.
String
that is the result of evaluating the expression and converting the result to a
String
.
javax.xml.xpath.XPathExpressionException
- If the expression cannot be evaluated.
java.lang.NullPointerException
- If source
is null
.
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