Difference between revisions of "Java Bindings"
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(Created page with "==Java Binding== The Java Binding feature is an extensibility mechanism which allows direct calling of Java methods bound as XQuery functions and manipulation of wrapped Java ob...") |
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Revision as of 11:51, 6 December 2010
Java Binding
The Java Binding feature is an extensibility mechanism which allows direct calling
of Java methods bound as XQuery functions and manipulation of wrapped Java objects.
The following examples introduce the behavior. Please note that the namespace URI
must be of the form java:fullyQualifiedClassName
.
This example uses the java
Math
class and returns the cosine of an angle:declare namespace math = "java:java.lang.Math"; math:cos(xs:double(0))The next example writes 256 bytes to the file
output.txt
:declare namespace fw = "java:java.io.FileWriter"; let $file := fw:new('output.txt') return ( for $i in 0 to 255 return fw:write($file, xs:int($i)), fw:close($file) )
Try/Catch
The well-known try/catch construct can be used in BaseX to intercept
run-time errors. This feature will also be part of the new
<a href="http://www.w3.org/TR/xquery-11/#id-try-catch">XQuery 1.1 Recommendation</a>.
Example:
try { 1 + '2' } catch *($code, $desc) { concat('Error [', $code, ']: ', $desc) }Result:
Error [XPTY0004]: '+' operator: number expected, string found.