package eu.dnetlib.dlms.jdbc.ast;

import java.sql.SQLException;

import eu.dnetlib.dlms.jdbc.ExecutorContext;
import eu.dnetlib.dlms.jdbc.server.IExpressionExecutor;

/**
 * This class wraps a Select statement into an Expression so that we can execute statements like
 * <code>Object o = select xPath</code>. When executing instances of this class only one element will be returned as
 * result.
 * 
 * @author lexis
 * 
 */
public class SelectOneExpression extends Expression {
	/** Select statement. */
	private Select select;

	@Override
	public Object evaluate(final IExpressionExecutor executor, final ExecutorContext context) throws SQLException {
		return executor.evaluate(this, context);
	}

	/**
	 * Constructor.
	 * 
	 * @param select
	 *            Select statement
	 */
	public SelectOneExpression(final Select select) {
		super();
		this.select = select;
	}

	public Select getSelect() {
		return this.select;
	}

	public void setSelect(final Select select) {
		this.select = select;
	}

	@Override
	public String toString() {
		return "SelectOneExpression [select=" + this.select + "]";
	}

}