PlayerInterpreter.java

import java.util.Arrays;

public class PlayerInterpreter {

	public Action interpretString(String string) {

		if(string.equals("")) {
			return Action.ActionPass;
		}
		return action(string.toLowerCase().split(" "));
	}
	private Action action(String[] string) throws ArrayIndexOutOfBoundsException {
		
		if(string == null || string.length == 0) {
			return Action.ActionPass;
		}
		if(string[0].compareTo("go") == 0 || string[0].compareTo("travel") == 0 || string[0].compareTo("proceed") == 0){
			String[] command = Arrays.copyOfRange(string, 1, string.length);
			return action(command);
		}
		else {

			// input could be northeast, put cpu in vax, throw shovel, examine bin
			
			String s = string[0];
			Action action = null;
			out:{
				for(Action a : Action.values()) {
					for(String alias : a.getAliases()) {

						if(s.compareTo(alias) == 0) {
							action = a;
							break out;
						}
					}
				}
			}
			if(action == null) {
				return Action.ActionError;
			}
			switch(action.type()) {
				case TYPE_DIRECTIONAL:
					return action;
				case TYPE_HASDIRECTOBJECT:
					// test direct object
					// "throw SHOVEL"
					if(string.length > 1) {

						String d = string[1];
						Item item = Item.getInstance(d);
						//
						// item is the direct object of the action
						action.setDirectObject(item);
						return action;
					}
					else {
						System.out.println("You must supply a direct object.");
						return Action.ActionPass;
					}
				case TYPE_HASINDIRECTOBJECT:
				
					// test if it has indirect object
					// "put CPU IN VAX"
					// "Take Diamond from Microwave"

					if(string.length > 1) {

						String d = string[1];
						Item item = Item.getInstance(d);
						// item is the direct object of the action
						action.setDirectObject(item);
						
						if(string.length > 2) {
							String in = string[2];
							if(in.equals("in") || in.equals("from")) {
								
								if(string.length > 3) {
									String io = string[3];
									Item indob = Item.getInstance(io);
									action.setIndirectObject(indob);	
									return action;
								}
								else {
									System.out.println("You must supply an indirect object.");
									return Action.ActionError;
								}
							}
							else {
								return Action.ActionPass;
							}
						}
						
					}
					else {
						System.out.println("You must supply a direct object.");
						return Action.ActionError;
					}
					break;
				case TYPE_HASNOOBJECT:
					return action;
				case TYPE_UNKNOWN:
					return Action.ActionError;
				default:
					System.out.println("Unknown type");
					break;
			}
		}
		
		return Action.ActionPass;
	}
}