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/*******************************************************************
 * © 2022 SAP SE or an SAP affiliate company. All rights reserved. *
 *******************************************************************/
package com.sap.cds.ql;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import com.sap.cds.ql.cqn.CqnStatement;

public abstract class StatementBuilder implements CqnStatement {

	protected final Map hints = new HashMap<>(0);

	@Override
	public Map hints() {
		return Collections.unmodifiableMap(hints);
	}

	/**
	 * Sets the hints for the statement.
	 *
	 * @param hints the hint map
	 * @return this statement
	 */
	@SuppressWarnings("unchecked")
	public T hints(Map hints) {
		this.hints.clear();
		this.hints.putAll(hints);

		return (T) this;
	}

	/**
	 * Adds hints to the statement.
	 *
	 * @param hints the hints
	 * @return this statement
	 */
	@SuppressWarnings("unchecked")
	public T hints(String... hints) {
		for (String hint : hints) {
			hint(hint, true);	
		}
		return (T) this;
	}

	/**
	 * Adds a hint to the statement.
	 *
	 * @param name the hint name
	 * @param value the hint value 
	 * @return this statement
	 */
	@SuppressWarnings("unchecked")
	public T hint(String name, Object value) {
		this.hints.put(name, value);

		return (T) this;
	}

	@Override
	public String toString() {
		return toJson();
	}

}