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1   ////////////////////////////////////////////////////////////////////////////////
2   // MillScript: an Open Spice interpreter and batch website creation tool
3   // Copyright (C) 2001-2004 Open World Ltd
4   // Copyright (C) 2005 Kevin Rogers
5   //
6   // This file is part of MillScript.
7   //
8   // MillScript is free software; you can redistribute it and/or modify it under
9   // the terms of the GNU General Public License as published by the Free
10  // Software Foundation; either version 2 of the License, or (at your option)
11  // any later version.
12  //
13  // MillScript is distributed in the hope that it will be useful, but WITHOUT
14  // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15  // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
16  // more details.
17  //
18  // You should have received a copy of the GNU General Public License along with
19  // MillScript; if not, write to the Free Software Foundation, Inc., 59 Temple
20  // Place, Suite 330, Boston, MA  02111-1307  USA
21  ////////////////////////////////////////////////////////////////////////////////
22  package org.millscript.millscript.functions;
23  
24  import org.millscript.millscript.alert.Alerts;
25  import org.millscript.millscript.vm.Machine;
26  
27  import java.lang.reflect.Method;
28  
29  /**
30   * This class implements a function which invokes one of several Java methods.
31   * The exact Java method that is invoked depends on the number of arguments
32   * supplied when this function is called.
33   */
34  public class JOMethod extends Function {
35  
36      /**
37       * The array of methods to choose from, linking the number of arguments
38       * (position in the array) to the Java method to be called.
39       */
40      private final JMethod[] jmethods;
41  
42      /**
43       * Constructs a new <code>JOMethod</code> function to invoke one of the
44       * specified Java methods.
45       *
46       * @param meths the array of Java methods to choose from
47       */
48      public JOMethod( final Method[] meths ) {
49          jmethods = new JMethod[ meths.length ];
50          for ( int i = 0; i < meths.length; i++ ) {
51              Method m = meths[ i ];
52              if ( m != null ) {
53                  jmethods[ i ] = JMethod.make( m );
54              }
55          }
56      }
57  
58      /**
59       * @see org.millscript.millscript.functions.Function#apply(org.millscript.millscript.vm.Machine, int)
60       */
61      @Override
62      public void apply( final Machine mc, final int nargs ) {
63          JMethod j = null;
64          try {
65              j = jmethods[ nargs ];
66          } catch ( IndexOutOfBoundsException ex ) {
67              throw(
68                  Alerts.eval(
69                      "No method with this arity",
70                      null
71                  ).culprit( "arity", new Integer( nargs ) ).mishap()
72              );
73          }
74          j.apply( mc, nargs );
75      }
76  
77  }