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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 org.datayoo.moql.metadata;

import java.io.Serializable;
import java.util.LinkedList;
import java.util.List;

/**
 * 
 * @author Tang Tadin
 *
 */
public class ColumnsMetadata implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	protected boolean distinct = false;
	
	protected List columns = new LinkedList();
	
	public ColumnsMetadata() {}
	
	/**
	 * @return the distinct
	 */
	public boolean isDistinct() {
		return distinct;
	}

	/**
	 * @param distinct the distinct to set
	 */
	public void setDistinct(boolean distinct) {
		this.distinct = distinct;
	}

	/**
	 * @return the columns
	 */
	public List getColumns() {
		return columns;
	}

	/**
	 * @param columns the columns to set
	 */
	public void setColumns(List columns) {
		if (columns == null) {
			columns = new LinkedList();
		}
		this.columns = columns;
	}
	
	
}