benchmark.ubt.api.QueryConfigParser Maven / Gradle / Ivy

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package benchmark.ubt.api;

/*
 * #%L
 * nohr-benchmark
 * %%
 * Copyright (C) 2014 - 2015 NOVA Laboratory of Computer Science and Informatics (NOVA LINCS)
 * %%
 * This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * #L%
 */


/**
 * by Yuanbo Guo
 * Semantic Web and Agent Technology Lab, CSE Department, Lehigh University, USA
 * Copyright (C) 2004
 *
 * This program 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 2 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 Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */

import java.util.*;

public class QueryConfigParser extends ConfigParser {
	/** delimiter between arguments in an atom */
	public final char C_ARG_DELIM = ' ';
	/** beginning charater of a constituent atom of a query */
	public final char C_ATOM_BEGIN = '(';
	/** closing charater of a constituent atom of a query */
	public final char C_ATOM_END = ')';

	/** QuerySpecification object representing the current section */
	private QuerySpecification query_ = null;
	/** list of queries */
	private Vector queryList_;

	/**
	 * constructor
	 */
	public QueryConfigParser() {
	}

	/**
	 * Creates the query list by parsing the specified query config file.
	 *
	 * @param fileName
	 *            Name of the query config file.
	 * @return The created query list.
	 * @throws java.lang.Exception
	 *             if there are IO errors or syntax/content errors.
	 */
	public Vector createQueryList(String fileName) throws Exception {
		queryList_ = new Vector();
		parse(fileName);
		return queryList_;
	}

	/**
	 * Wraps up the previous section.
	 */
	private void endPrevSection() {
		if (query_ != null)
			queryList_.add(query_);
	}

	/**
	 * Processor of end of file.
	 *
	 * @throws java.lang.Exception
	 *             upon syntax/context errors.
	 */
	@Override
	protected void handleEndOfFile() throws Exception {
		if (query_ != null)
			endPrevSection();
	}

	/**
	 * Line processor.
	 *
	 * @param line
	 *            A line retrieved from the file.
	 * @throws java.lang.Exception
	 *             upon syntax/context errors.
	 */
	@Override
	void handleLine(String line) throws Exception {
		// comment line
		if (line.startsWith(COMMENT_PREFIX))
			return;

		String predicate;
		String[] args;
		int i, j, n;

		if (isStartOfSection(line)) {
			endPrevSection();
			// new section
			query_ = new QuerySpecification();
			query_.id_ = line.substring(1, line.length() - 1);
			if (query_.id_.length() <= 0)
				error("Empty id!");
		} else {
			String q = query_.query_.getString();
			if (q.length() > 0)
				q += "\n";
			query_.query_.setString(q + line);
			if (line.charAt(0) != C_ATOM_BEGIN || line.charAt(line.length() - 1) != C_ATOM_END)
				// Ignore the syntax error so that other langugages can be used.
				// error("Syntax error");
				return;
			line = line.substring(1, line.length() - 1);
			i = 0;
			for (n = 0; (i = line.indexOf(C_ARG_DELIM, i + 1)) >= 0; n++)
				;
			if (n < 0) {
				predicate = line;
				args = null;
			} else {
				predicate = line.substring(0, i = line.indexOf(C_ARG_DELIM));
				line = line.substring(++i);
				args = new String[n];
				for (j = 0; j < n - 1; j++) {
					args[j] = line.substring(0, i = line.indexOf(C_ARG_DELIM));
					line = line.substring(++i);
				}
				args[j] = line;
			}
			query_.query_.addAtom(predicate, args);
		}
	}
}