package org.eclipse.ui.internal.keybindings;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.ui.IMemento;

public final class Platform {
	
	public final static String TAG = "platform";		

	public static Platform create() {
		return new Platform(Path.create());
	}
	
	public static Platform create(Path path)
		throws IllegalArgumentException {
		return new Platform(path);
	}

	public static Platform read(IMemento memento)
		throws IllegalArgumentException {
		if (memento == null)
			throw new IllegalArgumentException();
			
		return Platform.create(Path.read(memento.getChild(Path.TAG)));
	}

	public static void write(IMemento memento, Platform platform)
		throws IllegalArgumentException {
		if (memento == null || platform == null)
			throw new IllegalArgumentException();
		
		Path.write(memento.createChild(Path.TAG), platform.getPath());
	}

	public static Platform system() {
		List elements = new ArrayList();				
		String platform = SWT.getPlatform();
		
		if (platform != null) {
			elements.add(Element.create(platform));
		}
			
		return Platform.create(Path.create(elements));
	}	
	
	private Path path;
	
	private Platform(Path path)
		throws IllegalArgumentException {
		super();
		
		if (path == null)
			throw new IllegalArgumentException();
		
		this.path = path;	
	}
	
	public Path getPath() {
		return path;	
	}
	
	public int match(Platform platform)
		throws IllegalArgumentException {
		if (platform == null)
			throw new IllegalArgumentException();
		
		return (path.match(platform.path));
	}
		
	public int compareTo(Object object) {
		if (!(object instanceof Platform))
			throw new ClassCastException();
			
		return path.compareTo(((Platform) object).path); 
	}
	
	public boolean equals(Object object) {
		if (!(object instanceof Platform))
			return false;
		
		return path.equals(((Platform) object).path);		
	}
}