/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * 5. Products derived from this software may not be called "Apache"
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
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 */

package org.apache.tools.ant.taskdefs.optional;

import org.apache.tools.ant.*;
import java.util.*;
import com.ibm.bsf.*;

/**
 * Defines a new task which consists of a script.
 * 
 * @author Nico Seessle <Nico.Seessle@epost.de>
 */
public class Function extends Task { 
    private static Hashtable scripts = new Hashtable();
    
    private String name = null;
    private Script script = null;
    private Vector params = new Vector();
    
    public void setName(String s) { 
        name = s;
    }
    
    public void execute() { 
        if (taskName.equals("function")) { 
            // Declare a new function
            if (name == null) { 
                throw new BuildException("You must provide a name");
            }

            if (script == null) { 
                throw new BuildException("You must provide a script");
            }

            project.addTaskDefinition(name, this.getClass());
            scripts.put(name, script);
            
        } else {
            // Execute the script
            script = (Script)scripts.get(taskName);
            for (Enumeration e = params.elements(); e.hasMoreElements(); ) { 
                Param param = (Param)e.nextElement();
                script.addBean(param.name, param.value);
            }
            script.execute();
        }
    }
    
    public Script createScript() { 
        script = (Script)project.createTask("script");
        return script;
    }
    
    public Param createParam() { 
        if (taskName.equals("function")) { 
            throw new BuildException("You can not add param's to the function-declaration");
        }
        Param param = new Param();
        params.addElement(param);
        return param;
    }

    public static class Param { 
        String name;
        String value;
        
        public void setName(String s) { 
            name = s;
        }
        
        public void setValue(String s) { 
            value = s;
        }
    }
    
}