01: package org.mandarax.jdbc.server.sql;
02:
03: /*
04: * Copyright (C) 1999-2004 <a href="mailto:mandarax@jbdietrich.com">Jens Dietrich</a>
05: *
06: * This library is free software; you can redistribute it and/or
07: * modify it under the terms of the GNU Lesser General Public
08: * License as published by the Free Software Foundation; either
09: * version 2 of the License, or (at your option) any later version.
10: *
11: * This library is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14: * Lesser General Public License for more details.
15: *
16: * You should have received a copy of the GNU Lesser General Public
17: * License along with this library; if not, write to the Free Software
18: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19: */
20:
21: /**
22: * Interface for SQL functions.
23: * @author <A HREF="mailto:mandarax@jbdietrich.com">Jens Dietrich</A>
24: * @version 3.3.2 <29 December 2004>
25: * @since 3.0
26: */
27: public interface Function {
28: /**
29: * Get the name of the function.
30: * @return the function name.
31: */
32: public String getName();
33:
34: /**
35: * Print the term built from this function.
36: * @param out the print buffer used for printing
37: * @param children an array of string produces by printing the children
38: */
39: public void print(StringBuffer out, ColumnTerm[] children);
40:
41: /**
42: * Indicates whether this is an aggregation function.
43: * @return a boolean
44: */
45: public boolean isAggregationFunction();
46:
47: /**
48: * Get the arity of the function (the number of parameters).
49: * @return an integer number
50: */
51: public int getArity();
52:
53: }
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