org.bitbucket.gkutiel.at.Context Maven / Gradle / Ivy

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package org.bitbucket.gkutiel.at;

import java.util.Iterator;

public abstract class Context implements Iterable {
	final Context parent;

	public static final Context nullContext = new Context(null) {
		@Override public Context get(final String name) {
			return this;
		}
	};

	public Context(final Context parent) {
		this.parent = parent;
	}

	public void add(final Context ctx) {
		if (parent == null) throw new RuntimeException("can't add");
		parent.add(ctx);
	}

	public Context get(final String name) {
		if (parent == null) return nullContext;
		return parent.get(name);
	}

	@Override public Iterator iterator() {
		throw new RuntimeException("can't iterate over me");
	}

	public void set(final String name, final Context ctx) {
		if (parent == null) throw new RuntimeException("can't set");
		parent.set(name, ctx);
	}

	@SuppressWarnings("static-method") public String val() {
		return null;
	}
}