// XAAL toolkit
// Copyright (C) 2009 Ville Karavirta <vkaravir(a)cs.hut.fi>
//
// 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 3 of the License, or
// (at your option) 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 PURPOSE.  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, see <http://www.gnu.org/licenses/>.
package xaal.parser;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Stack;

import xaal.objects.Xaal;
import xaal.parser.modules.XaalMainParserModule;

public class ParserModule {
    public static final String CURRENT_PATH = "curr-path";
    public static final String CURRENT_OBJECT = "curr-obj";
    private static Stack curr = new Stack();
    protected Stack s = new Stack();
    private static HashMap ds = new HashMap();
    
    public void push(Object item) {
        s.push(item);
        curr.push(item);
        setProperty(CURRENT_OBJECT, item);
    }
    
    public Object peek() {
        if (s.isEmpty())
            return null;
        return s.peek();
    }
    
    public Object pop() {
        if (s.isEmpty())
            return null;
        Object o = s.pop();
        curr.pop();
        if (curr.isEmpty()) {
            setProperty(CURRENT_OBJECT, null);
        } else {
            setProperty(CURRENT_OBJECT, curr.peek());
        }
        return o;
    }
    
    public static void setProperty(String name, Object value) {
        ds.put(name, value);
    }
    
    public static Object getProperty(String name) {
        return ds.get(name);
    }
    
    public static boolean hasProperty(String name) {
        return ds.containsKey(name);
    }
    
    public static Iterator getProperties() {
        return ds.keySet().iterator();
    }
    
    public void characters(char[] ch, int start, int length) {
        
    }

    public static Object getCurrentObject() {
        return getProperty(CURRENT_OBJECT);
    }
    
    public static Xaal getXaalObject() {
        return (Xaal) ParserModule.getProperty(XaalMainParserModule.XAAL_ROOT_OBJECT);
    }
}