cz.jalasoft.util.converter.StringConverters Maven / Gradle / Ivy

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A collection of utility classes that might be useful.
There is a newer version: 1.0.4
package cz.jalasoft.util.converter;

import org.joda.time.DateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

/**
 * Created by honzales on 18.4.15.
 */
public final class StringConverters {

    public static StringConverter identity() {
        return new StringConverter() {
            @Override
            public String convert(String from) throws ConversionException {
                return from;
            }
        };
    }

    public static StringConverter toInteger() {
        return new StringConverter() {
            @Override
            public Integer convert(String from) throws ConversionException {
                try {
                    return Integer.parseInt(from);
                } catch (NumberFormatException exc) {
                    throw new ConversionException(from, String.class, Integer.class);
                }
            }
        };
    }

    public static StringConverter toLong() {
        return new StringConverter() {
            @Override
            public Long convert(String from) throws ConversionException {
                try {
                    return Long.parseLong(from);
                } catch (NumberFormatException exc) {
                    throw new ConversionException(from, String.class, Long.class);
                }
            }
        };
    }

    public static StringConverter toDouble() {
        return new StringConverter() {
            @Override
            public Double convert(String from) throws ConversionException {
                try {
                    return Double.parseDouble(from);
                } catch (NumberFormatException exc) {
                    throw new ConversionException(from, String.class, Double.class);
                }
            }
        };
    }

    public static StringConverter toIntegerOrElse(final StringConverter alternative) {
        return new StringConverter() {
            @Override
            public Integer convert(String from) throws ConversionException {
                try {
                    return Integer.parseInt(from);
                } catch (NumberFormatException exc) {
                    return alternative.convert(from);
                }
            }
        };
    }

    public static  StringConverter valueIfStringEqualTo(final String pattern, final T value) {
        return new StringConverter() {
            @Override
            public T convert(String from) throws ConversionException {
                if (from.equals(pattern)) {
                    return value;
                } else {
                    throw new ConversionException(from, String.class, Object.class);
                }
            }
        };
    }

    public static StringConverter toDateTime(final String pattern) {
        return new StringConverter() {
            @Override
            public DateTime convert(String from) throws ConversionException {
                DateTimeFormatter formatter = DateTimeFormat.forPattern(pattern);
                return DateTime.parse(from, formatter);
            }
        };
    }

    private StringConverters() {}
}