TabularFileParser.java

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/* *********************************************************************** *
 * project: org.matsim.*
 * TabularFileParser.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2007 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   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.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

package org.matsim.core.utils.io.tabularFileParser;

import java.io.BufferedReader;
import java.io.IOException;

import org.matsim.core.api.internal.MatsimSomeReader;
import org.matsim.core.utils.io.IOUtils;

public class TabularFileParser implements MatsimSomeReader {

    private TabularFileParserConfig config = null;

    private boolean isStart(String line) {
        final String regex = this.config.getStartRegex();
        if (regex == null)
            return true;
        return line.matches(regex);
    }

    private boolean isEnd(String line) {
        final String regex = this.config.getEndRegex();
        if (regex == null)
            return false;
        return line.matches(regex);
    }

    private boolean isComment(String line) {
        final String regex = this.config.getCommentRegex();
        if (regex == null)
            return false;
        return line.matches(regex);
    }

    private String[] split(String line) {
        final String regex = this.config.getDelimiterRegex();
        if (regex == null)
            return new String[] { line };
        return line.split(regex);
    }

    public void parse(TabularFileParserConfig config,
            TabularFileHandler handler) {
        if (config == null)
            throw new NullPointerException(
                    "TabularFileParser requires a non-null configuration.");
        if (handler == null)
            throw new NullPointerException(
                    "TabularFileParser requires a non-null handler.");

        this.config = config;

        boolean started = (config.getStartRegex() == null);
        boolean ended = false;
        
        try ( BufferedReader reader = config.getUrl() == null ? IOUtils.getBufferedReader(IOUtils.resolveFileOrResource(config.getFile()), config.getCharset()) : IOUtils.getBufferedReader(config.getUrl(), config.getCharset()) ) {
            String line;
            while ((line = reader.readLine()) != null && !ended) {
                if (started) {
                    ended = isEnd(line);
                    if (!ended && !isComment(line)) {
                        handler.startRow(split(line));
                    }
                } else {
                    started = isStart(line);
                }
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        // try-with-resources does not need the following any more. kai, may'15
//        finally {
//            try {
//                reader.close();
//            } catch (IOException e) {
//                throw new RuntimeException(e);
//            }
//        }
    }

}