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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2014 - 2015, Open Source Geospatial Foundation (OSGeo)
 *
 *    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;
 *    version 2.1 of the License.
 *
 *    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.
 */
package org.geotools.data.util;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.measure.Unit;
import org.geotools.measure.Measure;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
import org.geotools.util.factory.Hints;
import tech.units.indriya.format.SimpleUnitFormat;

/**
 * ConverterFactory which converts between the {@link Measure} and String.
 *
 * @author Andrea Aime - GeoSolutions
 * @since 12.0
 */
public class MeasureConverterFactory implements ConverterFactory {

    static final Pattern MEASURE_PATTERN =
            Pattern.compile("\\s*([-\\+]?[0-9]*\\.?[0-9]*(?:[eE][-\\+]?[0-9]+)?)(.*)?");

    public static final Converter CONVERTER =
            new Converter() {
                @Override
                public  T convert(Object source, Class target) throws Exception {
                    if (source == null) {
                        return null;
                    } else if (String.class.equals(target)) {
                        Measure m = (Measure) source;
                        DecimalFormat format =
                                (DecimalFormat) NumberFormat.getNumberInstance(Locale.ENGLISH);
                        if (m.doubleValue() < 1e-5) {
                            format.applyPattern("0.###E0");
                        } else {
                            format.applyPattern("#0.##");
                        }
                        String v = format.format(m.doubleValue());
                        if (m.getUnit() != null) {
                            return (T) (v + m.getUnit());
                        } else {
                            return (T) v;
                        }
                    }

                    if (!Measure.class.isAssignableFrom(target) || source == null) {
                        return null;
                    }

                    String str = (String) source;
                    if (str.trim().isEmpty()) {
                        return null;
                    }
                    Matcher matcher = MEASURE_PATTERN.matcher(str);
                    if (matcher.matches()) {
                        double value = Double.parseDouble(matcher.group(1));
                        Unit unit = null;
                        if (matcher.groupCount() == 2) {
                            // this will throw an exception in case of failure
                            String group = matcher.group(2).trim();
                            if (!group.isEmpty()) {
                                unit = SimpleUnitFormat.getInstance().parse(group);
                            }
                        }
                        return (T) new Measure(value, unit);
                    } else {
                        throw new IllegalArgumentException("Invalid measure " + str);
                    }
                }
            };

    public Converter createConverter(Class source, Class target, Hints hints) {
        if (CharSequence.class.isAssignableFrom(source) && Measure.class.isAssignableFrom(target)) {
            return CONVERTER;
        } else if (String.class.isAssignableFrom(target)
                && Measure.class.isAssignableFrom(source)) {
            return CONVERTER;
        }

        // not a case we can handle
        return null;
    }
}