PositiveInteger.java

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package org.glassfish.config.support.datatypes;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.config.DataType;
import org.jvnet.hk2.config.ValidationException;

/** Represents an integer from 1 to Integer.MAX_VALUE. 
 *  It's modeled as a functional class.
 * @author केदार (km@dev.java.net) 
 */
@Service
public class PositiveInteger implements DataType { //could extend NonNegativeInteger
    
    /** Validates the given value as a positive integer.
     * @param value
     * @throws org.jvnet.hk2.config.ValidationException
     */
    public void validate(String value) throws ValidationException {
        if (value == null)
            throw new ValidationException("null value is not of type PositiveInteger");
        if (NonNegativeInteger.isTokenized(value))
            return; //a token is always valid             
        try {
            long number = Long.parseLong(value);
            if (number < 1 || number > Integer.MAX_VALUE) { //taken from ServerSocket.java
                String msg = "value: " + number + " not applicable for PositiveInteger [1, " + Integer.MAX_VALUE + "] data type";
                throw new ValidationException(msg);
            }
        } catch(NumberFormatException e) {
            String msg = "value: " + value + " does not represent an Integer";
            throw new ValidationException(msg);
        }
    }
}