/*******************************************************************************
 * Copyright (c) 2007, 2008 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.utils.envvar;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.cdt.core.envvar.IEnvironmentVariable;

public class EnvironmentCollector {
	private Map<String, IEnvironmentVariable> fEnfironmentMap = new HashMap<String, IEnvironmentVariable>();
	
	public IEnvironmentVariable addVariable(IEnvironmentVariable var){
		if(var == null)
			return null;
		
		String name = var.getName();
		
		name = EnvVarOperationProcessor.normalizeName(name);
		
		if(name != null){
			IEnvironmentVariable old = fEnfironmentMap.get(name);
			if(old != null){
				var = EnvVarOperationProcessor.performOperation(old, var);
			}
			fEnfironmentMap.put(name, var);
		}
		
		return var;
	}
	
	public void addVariables(IEnvironmentVariable[] vars){
		if(vars == null)
			return;
		for(int i = 0; i < vars.length; i++){
			addVariable(vars[i]);
		}
	}
	
	public IEnvironmentVariable getVariable(String name){
		name = EnvVarOperationProcessor.normalizeName(name);
		if(name != null)
			return fEnfironmentMap.get(name);
		return null;
	}
	
	public IEnvironmentVariable[] getVariables(){
		return fEnfironmentMap.values().toArray(new IEnvironmentVariable[fEnfironmentMap.size()]);
	}
}