KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > net > sf > saxon > instruct > TailCallReturner


1 package net.sf.saxon.instruct;
2
3 import net.sf.saxon.expr.XPathContext;
4 import net.sf.saxon.trans.XPathException;
5
6 /**
7  * This interface represents an expression that is capable of being processed leaving tail calls for the
8  * calling instruction to deal with.
9  */
10
11 public interface TailCallReturner {
12
13     /**
14     * ProcessLeavingTail: called to do the real work of this instruction. This method
15     * must be implemented in each subclass. The results of the instruction are written
16     * to the current Receiver, which can be obtained via the Controller.
17     * @param context The dynamic context of the transformation, giving access to the current node,
18     * the current variables, etc.
19     * @return null if the instruction has completed execution; or a TailCall indicating
20     * a function call or template call that is delegated to the caller, to be made after the stack has
21     * been unwound so as to save stack space.
22     */
23
24     public TailCall processLeavingTail(XPathContext context) throws XPathException;
25 }
26
27 //
28 // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
29 // you may not use this file except in compliance with the License. You may obtain a copy of the
30 // License at http://www.mozilla.org/MPL/
31 //
32 // Software distributed under the License is distributed on an "AS IS" basis,
33 // WITHOUT WARRANTY OF ANY KIND, either express or implied.
34 // See the License for the specific language governing rights and limitations under the License.
35 //
36 // The Original Code is: all this file.
37 //
38 // The Initial Developer of the Original Code is Michael H. Kay.
39 //
40 // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
41 //
42 // Contributor(s):
43 //
44
Popular Tags