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/*******************************************************************************
 * Copyright (c) 2006, 2013 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation
 *
 ******************************************************************************/
package org.eclipse.persistence.jpa.jpql.parser;

import org.eclipse.persistence.jpa.jpql.WordParser;

/**
 * An implementation of an {@link Expression} that wraps a string.
 *
 * @version 2.4
 * @since 2.3
 * @author Pascal Filion
 */
public final class DefaultStringExpression extends AbstractExpression {

	/**
	 * The wrapped string value.
	 */
	private final String value;

	/**
	 * Creates a new DefaultStringExpression.
	 *
	 * @param owningExpression The {@link Expression} from where the text value comes
	 * @param value The string value to wrap with this {@link Expression}
	 */
	DefaultStringExpression(AbstractExpression owningExpression, String value) {
		super(owningExpression);
		this.value = value;
	}

	/**
	 * {@inheritDoc}
	 */
	public void accept(ExpressionVisitor visitor) {
		// This object should not be visited
	}

	/**
	 * {@inheritDoc}
	 */
	public void acceptChildren(ExpressionVisitor visitor) {
		// This object does not have children
	}

	/**
	 * {@inheritDoc}
	 */
	public JPQLQueryBNF getQueryBNF() {
		return null;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void parse(WordParser wordParser, boolean tolerant) {
		// Nothing to parse
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void populatePosition(QueryPosition queryPosition, int position) {
		queryPosition.setExpression(getParent());
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void toParsedText(StringBuilder writer, boolean actual) {
		writer.append(value);
	}
}