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Woodstox is a high-performance XML processor that implements Stax (JSR-173) and SAX2 APIs
There is a newer version: 4.4.1
package com.ctc.wstx.util;

/**
 * Simple static utility class that contains (static) utility methods useful
 * when parsing non-typesafe arguments (String-only configuration, command
 * line args).
 */
public final class ArgUtil
{
    private ArgUtil() { }

    public static boolean convertToBoolean(String prop, Object value)
    {
        if (value == null) {
            return false;
        }
        if (value instanceof Boolean) {
            return ((Boolean) value).booleanValue();
        }
        if (value instanceof String) {
            String str = (String) value;
            if (str.equalsIgnoreCase("false")) {
                return false;
            }
            if (str.equalsIgnoreCase("true")) {
                return true;
            }
            throw new IllegalArgumentException("Invalid String value for property '"+prop+"': expected Boolean value.");
        }
        throw new IllegalArgumentException("Invalid value type ("+value.getClass()+") for property '"+prop+"': expected Boolean value.");
    }

    public static int convertToInt(String prop, Object value, int minValue)
    {
        int i;

        if (value == null) {
            i = 0;
        } else if (value instanceof Number) {
            i = ((Number) value).intValue();
        } else if (value instanceof String) {
            try {
                i = Integer.parseInt((String) value);
            } catch (NumberFormatException nex) {
                throw new IllegalArgumentException("Invalid String value for property '"+prop+"': expected a number (Integer).");
            }
        } else {
            throw new IllegalArgumentException("Invalid value type ("+value.getClass()+") for property '"+prop+"': expected Integer value.");
        }

        if (i < minValue) {
            throw new IllegalArgumentException("Invalid numeric value ("+i
                                               +") for property '"+prop
                                               +"': minimum is "+minValue+".");
        }
        return i;
    }
    public static long convertToLong(String prop, Object value, long minValue)
    {
        long i;

        if (value == null) {
            i = 0;
        } else if (value instanceof Number) {
            i = ((Number) value).longValue();
        } else if (value instanceof String) {
            try {
                i = Long.parseLong((String) value);
            } catch (NumberFormatException nex) {
                throw new IllegalArgumentException("Invalid String value for property '"+prop+"': expected a number (Long).");
            }
        } else {
            throw new IllegalArgumentException("Invalid value type ("+value.getClass()+") for property '"+prop+"': expected Long value.");
        }

        if (i < minValue) {
            throw new IllegalArgumentException("Invalid numeric value ("+i
                                               +") for property '"+prop
                                               +"': minimum is "+minValue+".");
        }
        return i;
    }
}