LoopedAstReference.java

package ptolemy.actor.ptalon.model;

import java.util.Stack;

import ptolemy.data.Token;
import antlr.collections.AST;

public class LoopedAstReference {

	public LoopedAstReference(AST ast, Stack<Token> forTokens) {
		_forTokens = new Stack<Token>();
		for (int i = 0; i < forTokens.size(); i++) {
			_forTokens.push(forTokens.elementAt(i));
		}
		_ast = ast;
	}

	public boolean equals(Object obj) {
		if (obj instanceof LoopedAstReference) {
			LoopedAstReference ref = (LoopedAstReference) obj;
			if (ref._ast != _ast) {
				return false;
			}
			if (ref._forTokens.size() != _forTokens.size()) {
				return false;
			}
			for (int i = 0; i < _forTokens.size(); i++) {
				if (!ref._forTokens.elementAt(i).equals(_forTokens.elementAt(i))) {
					return false;
				}
			}
			return true;
		}
		return super.equals(obj);
	}

	public int hashCode() {
		int code = _ast.hashCode();
		for (int i = 0; i < _forTokens.size(); i++) {
			code ^= _forTokens.elementAt(i).hashCode();
		}
		return code;
	}

	private Stack<Token> _forTokens;

	private AST _ast;
}