dk.eobjects.metamodel.query.SelectClause Maven / Gradle / Ivy

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/**
 *  This file is part of MetaModel.
 *
 *  MetaModel is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  MetaModel 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 Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with MetaModel.  If not, see .
 */
package dk.eobjects.metamodel.query;

import dk.eobjects.metamodel.schema.Column;

/**
 * Represents the SELECT clause of a query containing SelectItems.
 * 
 * @see SelectItem
 */
public class SelectClause extends QueryClause {

	private static final long serialVersionUID = -2458447191169901181L;
	private boolean _distinct = false;

	public SelectClause(Query query) {
		super(query, QueryClause.PREFIX_SELECT, QueryClause.DELIM_COMMA);
	}

	public SelectItem getSelectItem(Column column) {
		if (column != null) {
			for (SelectItem item : getItems()) {
				if (column.equals(item.getColumn())) {
					return item;
				}
			}
		}
		return null;
	}

	@Override
	public String toString() {
		if (getItems().size() == 0) {
			return "";
		}

		StringBuilder sb = new StringBuilder(super.toString());
		if (_distinct) {
			sb.insert(QueryClause.PREFIX_SELECT.length(), "DISTINCT ");
		}
		return sb.toString();
	}

	public boolean isDistinct() {
		return _distinct;
	}

	public void setDistinct(boolean distinct) {
		_distinct = distinct;
	}

	@Override
	public boolean equals(Object obj) {
		boolean equals = super.equals(obj);
		if (equals) {
			SelectClause that = (SelectClause) obj;
			equals = this.isDistinct() && that.isDistinct();
		}
		return equals;
	}
}