/*******************************************************************************
 * Copyright (c) 2005, 2007 Intel Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Intel Corporation - Initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.managedbuilder.internal.enablement;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.eclipse.cdt.managedbuilder.core.IManagedConfigElement;

public abstract class CompositeExpression implements IBooleanExpression {
	private IBooleanExpression fChildren[];
	protected CompositeExpression(IManagedConfigElement element){
		IManagedConfigElement childElement[] = element.getChildren();
		IBooleanExpression children[] = new IBooleanExpression[childElement.length];
		int num = 0;
		for(int i = 0; i < childElement.length; i++){
			IBooleanExpression child = createExpression(childElement[i]);
			if(child != null)
				children[num++] = child;
		}
		
		if(num < children.length){
			IBooleanExpression tmp[] = new IBooleanExpression[num];
			System.arraycopy(children,0,tmp,0,num);
			children = tmp;
		}
		fChildren = children;
	}
	
	protected IBooleanExpression createExpression(IManagedConfigElement element){
		String name = element.getName();
		if (AndExpression.NAME.equals(name))
			return new AndExpression(element);
		else if (OrExpression.NAME.equals(name))
			return new OrExpression(element);
		else if (NotExpression.NAME.equals(name))
			return new NotExpression(element);
		else if (CheckOptionExpression.NAME.equals(name))
			return new CheckOptionExpression(element);
		else if (CheckStringExpression.NAME.equals(name))
				return new CheckStringExpression(element);
		else if (FalseExpression.NAME.equals(name))
			return new FalseExpression(element);
		else if (CheckHolderExpression.NAME.equals(name))
			return new CheckHolderExpression(element);
		else if (CheckBuildPropertyExpression.NAME.equals(name))
			return new CheckBuildPropertyExpression(element);
		else if (HasNatureExpression.NAME.equals(name))
			return new HasNatureExpression(element);
		return null;
	}
	
	public IBooleanExpression[] getChildren(){
		return fChildren;
	}
	
	public Map<String, Set<String>> getReferencedProperties(Map<String, Set<String>> map){
		IBooleanExpression children[] = getChildren();
		if(map == null)
			map = new HashMap<String, Set<String>>();

		for(int i = 0; i < children.length; i++){
			IBooleanExpression child = children[i];
			if(child instanceof CompositeExpression){
				((CompositeExpression)child).getReferencedProperties(map);
			} else if(child instanceof CheckBuildPropertyExpression){
				CheckBuildPropertyExpression bp = (CheckBuildPropertyExpression)child;
				String prop = bp.getPropertyId();
				String val = bp.getValueId();
				if(prop != null && prop.length() != 0  
						&& val != null && val.length() != 0){
					Set<String> set = map.get(prop);
					if(set == null){
						set = new HashSet<String>();
						map.put(prop, set);
					}
					set.add(val);
				}
			}
		}
		return map;
	}
}