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JSqlParser parses an SQL statement and translate it into a hierarchy of Java classes. The generated hierarchy can be navigated using the Visitor Pattern.

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/*
 * #%L
 * JSQLParser library
 * %%
 * Copyright (C) 2004 - 2013 JSQLParser
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as 
 * published by the Free Software Foundation, either version 2.1 of the 
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public 
 * License along with this program.  If not, see
 * .
 * #L%
 */
package net.sf.jsqlparser.statement.select;

import java.util.List;

/**
 * A DISTINCT [ON (expression, ...)] clause
 */
public class Distinct {

	private List onSelectItems;

	/**
	 * A list of {@link SelectItem}s expressions, as in "select DISTINCT ON
	 * (a,b,c) a,b FROM..."
	 *
	 * @return a list of {@link SelectItem}s expressions
	 */
	public List getOnSelectItems() {
		return onSelectItems;
	}

	public void setOnSelectItems(List list) {
		onSelectItems = list;
	}

	@Override
	public String toString() {
		String sql = "DISTINCT";

		if (onSelectItems != null && !onSelectItems.isEmpty()) {
			sql += " ON (" + PlainSelect.getStringList(onSelectItems) + ")";
		}

		return sql;
	}
}