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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.bluenimble.platform.query.impls;

import java.util.Iterator;

import com.bluenimble.platform.Json;
import com.bluenimble.platform.json.JsonObject;
import com.bluenimble.platform.query.OrderBy;
import com.bluenimble.platform.query.OrderByField;

public class JsonOrderBy implements OrderBy {

	private static final long serialVersionUID = -4482690420390364506L;
	
	protected JsonObject source;
	
	public JsonOrderBy (JsonObject source) {
		this.source = source;
	}

	@Override
	public Iterator fields () {
		return source.keys ();
	}

	@Override
	public OrderByField get (String field) {
		return new OrderByFieldImpl (field, Direction.valueOf (Json.getString (source, field, Direction.asc.name ())));
	}

	@Override
	public int count () {
		if (source == null) {
			return 0;
		}
		return source.size ();
	}
	
	@Override
	public boolean isEmpty () {
		return source == null || source.isEmpty ();
	}

}