org.kalypso.model.wspm.tuhh.ui.utils.GuessStationPatternReplacer.java Source code

Introduction

Here is the source code for org.kalypso.model.wspm.tuhh.ui.utils.GuessStationPatternReplacer.java

Source

/*----------------    FILE HEADER KALYPSO ------------------------------------------
 *
 *  This file is part of kalypso.
 *  Copyright (C) 2004 by:
 * 
 *  Technical University Hamburg-Harburg (TUHH)
 *  Institute of River and coastal engineering
 *  Denickestrae 22
 *  21073 Hamburg, Germany
 *  http://www.tuhh.de/wb
 * 
 *  and
 * 
 *  Bjoernsen Consulting Engineers (BCE)
 *  Maria Trost 3
 *  56070 Koblenz, Germany
 *  http://www.bjoernsen.de
 * 
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 * 
 *  This library 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
 *  Lesser General Public License for more details.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 *  Contact:
 * 
 *  E-Mail:
 *  belger@bjoernsen.de
 *  schlienger@bjoernsen.de
 *  v.doemming@tuhh.de
 * 
 *  ---------------------------------------------------------------------------*/
package org.kalypso.model.wspm.tuhh.ui.utils;

import java.math.BigDecimal;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.lang3.StringUtils;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.kalypso.commons.patternreplace.PatternInputReplacer;
import org.kalypso.model.wspm.tuhh.ui.KalypsoModelWspmTuhhUIPlugin;
import org.kalypso.model.wspm.tuhh.ui.i18n.Messages;

/**
 * @author Gernot Belger
 */
public class GuessStationPatternReplacer extends PatternInputReplacer<GuessStationContext> {
    public GuessStationPatternReplacer() {
        addReplacer(new GuessStationPattern());
    }

    public static Pattern[] preparePatterns(final GuessStationContext[] searchContexts,
            final String searchPattern) {
        final Pattern[] stationPatterns = new Pattern[searchContexts.length];

        final GuessStationPatternReplacer patternReplacer = new GuessStationPatternReplacer();
        for (int i = 0; i < searchContexts.length; i++) {
            final String current = patternReplacer.replaceTokens(searchPattern, searchContexts[i]);
            stationPatterns[i] = Pattern.compile(current, Pattern.CASE_INSENSITIVE);
        }

        return stationPatterns;
    }

    public static BigDecimal findStation(final String searchString, final GuessStationContext[] searchContexts,
            final Pattern[] searchPatterns) {
        for (int i = 0; i < searchPatterns.length; i++) {
            final Matcher matcher = searchPatterns[i].matcher(searchString);
            if (matcher.matches()) {
                final String stationString = matcher.group(1);

                final BigDecimal station = searchContexts[i].parseStation(stationString);
                if (station == null)
                    return null;

                // Set scale to 1, as it is in the database, else we get problems to compare
                // with existing cross sections
                return station.setScale(1, BigDecimal.ROUND_HALF_UP);
            }
        }

        return null;
    }

    /*
     * Replace the <station> token with a general search pattern, so we only consider any file that matches the basic
     * pattern.
     */
    public static Pattern asSearchPattern(final String searchPattern) {
        final String generalPattern = searchPattern.replaceAll("\\Q<station>\\E", ".*"); //$NON-NLS-1$ //$NON-NLS-2$
        return Pattern.compile(generalPattern, Pattern.CASE_INSENSITIVE);
    }

    public static String getSearchRegex(final String stationPattern) throws CoreException {
        final String token = String.format("<%s>", GuessStationPattern.TOKEN); //$NON-NLS-1$

        final int countMatches = StringUtils.countMatches(stationPattern, token);
        if (countMatches != 1) {
            final String msg = String.format(Messages.getString("GuessStationPatternReplacer.2"), stationPattern); //$NON-NLS-1$
            throw new CoreException(new Status(IStatus.ERROR, KalypsoModelWspmTuhhUIPlugin.getID(), msg));
        }

        if (stationPattern.endsWith(token)) {
            // REMARK: in this case, we automatically extend the pattern with a '*',
            // as we assume that we at least have an extension
            return asRegex(stationPattern.substring(0, stationPattern.length() - token.length())) + token + ".*"; //$NON-NLS-1$
        }

        if (stationPattern.startsWith(token))
            return token + asRegex(stationPattern.substring(token.length()));

        final String[] split = stationPattern.split("\\Q" + token + "\\E"); //$NON-NLS-1$ //$NON-NLS-2$
        return asRegex(split[0]) + token + asRegex(split[1]);
    }

    private static String asRegex(final String pattern) {
        final StringBuilder builder = new StringBuilder();

        for (int i = 0; i < pattern.length(); i++) {
            final int index = pattern.indexOf('*', i);
            if (index == -1) {
                appendEscaped(builder, pattern.substring(i));
                i = pattern.length();
            } else {
                appendEscaped(builder, pattern.substring(i, index));
                builder.append(".*?"); //$NON-NLS-1$
                i = index;
            }
        }

        return builder.toString();
    }

    private static void appendEscaped(final StringBuilder builder, final String text) {
        if (text.isEmpty())
            return;

        builder.append("\\Q").append(text).append("\\E"); //$NON-NLS-1$ //$NON-NLS-2$
    }

}