acessing java class methods from query
Added by Anonymous about 20 years ago
Legacy ID: #2817026 Legacy Poster: bob munger (bobmunger)
i want to access java class members from my xquery. i've managed to access class methods through static wrappers but i would like to access the class methods directly. here is my test: package com.idx.carecast.ca.ws.test; import java.io.ByteArrayOutputStream; import java.io.Reader; import java.io.StringReader; import java.util.Properties; import javax.xml.transform.OutputKeys; import javax.xml.transform.stream.StreamResult; import junit.framework.TestCase; import net.sf.saxon.Configuration; import net.sf.saxon.query.DynamicQueryContext; import net.sf.saxon.query.StaticQueryContext; import net.sf.saxon.query.XQueryExpression; public class WishfullTest extends TestCase { private static MsgHdrTO msgHdrDS; private static LogonDsTO logonDS; private static boolean connected = false; protected void setUp() throws Exception { super.setUp(); } protected void tearDown() throws Exception { super.tearDown(); } public void test() { try { // build context Configuration cfg = new Configuration(); cfg.setHostLanguage(Configuration.XQUERY); StaticQueryContext sqc = new StaticQueryContext(cfg); DynamicQueryContext dqc = new DynamicQueryContext(cfg); // build query String q = "declare namespace wft='java:com.idx.carecast.ca.ws.test.WishfullTest'" + "; declare variable $timeto external" + "; element TOTest1 { $timeto }" + ", element TOTest2 { wft:getField($timeto, 'time') } " + ", wft:setField($timeto, 'time', '0') " + ", element TOTest3 { wft:getField($timeto, 'time') } "; Reader qr = new StringReader(q); XQueryExpression xqx = sqc.compileQuery(qr); // configure engine dqc.setParameter("timeto", new TestClass()); ByteArrayOutputStream baos = new ByteArrayOutputStream(); Properties props = new Properties(); props.setProperty(OutputKeys.INDENT, "yes"); props.setProperty(OutputKeys.OMIT_XML_DECLARATION, "yes"); xqx.run(dqc, new StreamResult(baos), props); System.out.println(baos.toString()); } catch (Exception e) { e.printStackTrace(); System.exit(1); } } public class TestClass { String time; public TestClass() { time = Long.toString(System.currentTimeMillis()); } public String toString() { return time; } public String getField( String name) { if (name.equalsIgnoreCase("time")) { return time; } return null; } public void setField( String name, String value) { if (name.equalsIgnoreCase("time")) { time = value; } } } public static String getField( TestClass tc, String name) { return tc.getField(name); } public static void setField( TestClass tc, String name, String value) { tc.setField(name, value); } } can i access the class methods directly? thanks, bob
Replies (2)
RE: acessing java class methods from query - Added by Anonymous about 20 years ago
Legacy ID: #2817789 Legacy Poster: Michael Kay (mhkay)
I think this should be possible, though I've never tested calling a method on an inner class: I would try it with a "normal" class first. The namespace URI should contain the name of the class whose method you are invoking, which is TestClass not WishfullTest. Use the -TJ option for diagnostics if you hit problems. Michael Kay
RE: acessing java class methods from query - Added by Anonymous about 20 years ago
Legacy ID: #2818033 Legacy Poster: bob munger (bobmunger)
thanks. i accidentally stumbled onto the correct syntax for calling class methods when i added an extra arg to my static method. i'm still learning to navigate around the available info. being primed for enlightment i finally read file://localhost/J:/Saxon/doc/documentation/extensibility/functions.html and it all became clear. as you suggested i moved my test transfer object into a seperate object. my query test now looks like this: String q = "declare namespace wft='java:com.idx.carecast.ca.ws.test.WishfullTest';\n" + "declare namespace tto='java:com.idx.carecast.ca.ws.test.TestTO';\n" + "declare variable $timeto external;\n" + "element TOTest1 { $timeto },\n" + "element TOTest2 { wft:getField($timeto, 'time') },\n" + "wft:setField($timeto, 'time', '0'),\n" + "element TOTest3 { wft:getField($timeto, 'time') },\n" + "element TOTest4 { tto:getField($timeto, 'time') },\n" + "tto:setField($timeto, 'time', '123456789'),\n" + "element TOTest3 { tto:getField($timeto, 'time') } "; and i now can access both the static and class methods.
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