bundles/org.eclipse.wst.xml.xpath2.processor/src/org/eclipse/wst/xml/xpath2/processor/internal/ast/CastExpr.java

/*******************************************************************************
 * Copyright (c) 2005, 2009 Andrea Bittau, University College London, and others
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Andrea Bittau - initial API and implementation from the PsychoPath XPath 2.0 
 *******************************************************************************/

package org.eclipse.wst.xml.xpath2.processor.internal.ast;

/**
 * A class that creates a new value of a specific type based on an existing
 * value. A cast expression takes two operands: an input expression and a target
 * type. The type of the input expression is called the input type. The target
 * type must be a named atomic type, represented by a QName, optionally followed
 * by the occurrence indicator ? if an empty sequence is permitted. If the
 * target type has no namespace prefix, it is considered to be in the default
 * element/type namespace.
 */
public class CastExpr extends BinExpr {

	/**
	 * Constructor for CastExpr.
	 * 
	 * @param l
	 *            input xpath expression/variable.
	 * @param r
	 *            SingleType to cast l to.
	 */
	public CastExpr(Expr l, SingleType r) {
		super(l, r);
	}

	/**
	 * Support for Visitor interface.
	 * 
	 * @return Result of Visitor operation.
	 */
	@Override
	public Object accept(XPathVisitor v) {
		return v.visit(this);
	}
}