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The source code

/*
 * InvokeFunction.java - invoke a method
 * Copyright (C) 2000 Guillaume Desnoix
 * guillaume-desnoix@memoire.com
 * http://www.memoire.com/guillaume-desnoix/
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURSubE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.jext.dawn.javaccess;

import org.jext.dawn.*;
import java.lang.reflect.*;

/**
 * Invokes a method.
* Usage:
* object parameters method invoke
* Returns the result of the invocation if any. * @author Guillaume Desnoix */ public class InvokeFunction extends Function { public InvokeFunction() { super("invoke"); } public void invoke(DawnParser parser) throws DawnRuntimeException { parser.checkEmpty(this); Object o = parser.pop(); if (!(o instanceof Method)) throw new DawnRuntimeException(this, parser, "" + o + " is not a method"); Method m = (Method) o; Class[] t = m.getParameterTypes(); int n = t.length; boolean isStatic = ((m.getModifiers() & Modifier.STATIC) != 0); parser.checkArgsNumber(this, n + (isStatic ? 0 : 1)); try { Object[] p = new Object[n]; for(int i = n - 1; i >= 0; i--) p[i] = parser.pop(); for(int i = 0; i < n; i++) { if (p[i] == NullFunction.NULL) p[i] = null; else if ((t[i] == Integer.TYPE) || (t[i] == Integer.class)) { if(p[i] instanceof Number) p[i]=new Integer(((Number)p[i]).intValue()); } else if ((t[i] == Boolean.TYPE) || (t[i] == Boolean.class)) { if (p[i] instanceof Number) p[i] = ((((Number) p[i]).doubleValue() != 0.0) ? Boolean.TRUE : Boolean.FALSE); else if (!"\"\"".equals(p[i])) p[i] = Boolean.TRUE; else p[i] = Boolean.FALSE; } else if (t[i] == String.class) { String s = "" + p[i]; int l = s.length(); if ((l >= 2) && (s.charAt(0) == '\"') && (s.charAt(l - 1) == '\"')) s = s.substring(1, l - 1); p[i] = s; } else if ((t[i] == Float.TYPE) || (t[i] == Float.class)) { if (p[i] instanceof Number) p[i] = new Float(((Number) p[i]).floatValue()); } else if ((t[i] == Character.TYPE) || (t[i] == Character.class)) { if (p[i] instanceof Number) p[i] = new Character((char) ((Number) p[i]).intValue()); } else if ((t[i] == Short.TYPE) || (t[i] == Short.class)) { if(p[i] instanceof Number) p[i]=new Short(((Number)p[i]).shortValue()); } } Object r = m.invoke((isStatic ? null : parser.pop()),p); if (r != null) { parser.push(r); // System.out.println("RESULT = "+r); } } catch(IllegalAccessException ex) { throw new DawnRuntimeException(this, parser, "illegal access"); } catch(InvocationTargetException ex) { throw new DawnRuntimeException(this, parser, "invocation failed: " + ex.getTargetException().getMessage()); } } } // End of InvokeFunction.java
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