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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2014 sagyf Yang. The Four Group.
 */

package goja.core.libs.base;

import java.util.Collections;
import java.util.Iterator;

/**
 *  . 
 *
 * @author sagyf yang
 * @version 1.0 2014-09-11 13:26
 * @since JDK 1.6
 */
class None extends Option {

    @Override
    public boolean isDefined() {
        return false;
    }

    @Override
    public T get() {
        throw new IllegalStateException("No value");
    }

    public Iterator iterator() {
        return Collections.emptyList().iterator();
    }

    @Override
    public String toString() {
        return "None";
    }
}