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/**
 * 
 */
package stream;

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author chris
 *
 */
public abstract class AbstractContext implements Context {

	protected final Context parent;
	protected final String id;
	protected final Map values = new LinkedHashMap();

	public AbstractContext(String id) {
		this(id, null);
	}

	public AbstractContext(String id, Context parent) {
		this.parent = parent;
		this.id = id;
	}

	/**
	 * @see stream.Context#getId()
	 */
	@Override
	public String getId() {
		return id;
	}

	/**
	 * @see stream.Context#resolve(java.lang.String)
	 */
	@Override
	public Object resolve(String key) {
		if ("id".equals(key)) {
			return getId();
		}

		if (key.startsWith(scope() + ".")) {
			return values.get(key.substring(scope().length() + 1));
		}

		if (parent != null) {
			return parent.resolve(key);
		}

		return null; // values.get(key);
	}

	/**
	 * @see stream.Context#contains(java.lang.String)
	 */
	@Override
	public boolean contains(String key) {
		if ("id".equals(key)) {
			return true;
		}

		return values.containsKey(key);
	}

	/**
	 * @see stream.Context#getParent()
	 */
	@Override
	public Context getParent() {
		return parent;
	}

	public String name() {
		return this.getClass().getSimpleName().toLowerCase().replaceAll("context$", "");
	}

	public String scope() {
		return this.getClass().getSimpleName().toLowerCase().replaceAll("context$", "");
	}

	public String path() {
		if (parent != null) {
			return parent.path() + Context.PATH_SEPARATOR
					+ this.getClass().getSimpleName().toLowerCase().replaceAll("context$", "") + ":" + getId();
		} else {
			return this.getClass().getSimpleName().toLowerCase().replaceAll("context$", "") + ":" + getId();
		}
	}
}