Java Bindings
The Java Binding query 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))
Note: To call a method directly it has to be set as static
in you java code.
The next example writes 256 bytes to the file output.txt
.
To call the write
method of the FileWriter class,
you have to pass a class instance as first argument:
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) )
Note that we recommend to use XQuery expressions and functions whenever possible, as Java code cannot be pre-compiled by BaseX, and will most probably be evaluated slower than pure XQuery code.