ClientSideValidator.java

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package guessnumber;

import java.text.MessageFormat;
import java.io.Serializable;

import javax.faces.application.FacesMessage;
import javax.faces.application.ResourceDependency;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import javax.faces.validator.FacesValidator;

/**
 * <p>This validator splits the work between the client and the server.</p>
 *
 * <p>This Validator, when processed by the runtime, will cause an external
 * script reference to be generated in the head refering to <code>js/validator.js</code>
 * (by viture of the @ResourceDepedency annotation associated with this Validator).
 * Additionally, this Validator is a <code>ComponentSystemEventListener</code>,
 * and as such when it's processed by the <code>ClientSideValidatorHandler</code>,
 * this Validator will be registered as a listener to its associated input
 * component listening for <code>BeforeRenderEvents</code>.  When the event
 * is triggered and this listener is invoked, the validator will add an
 * <code>onmouseout</code> event to be rendered by the output component.</p>
 */
@FacesValidator(value="ClientSideValidator")
@ResourceDependency(name="js/validator.js")
@SuppressWarnings("unused")
public class ClientSideValidator implements Validator,
                                            Serializable {

    private static final long serialVersionUID = -5174092316834520806L;
    
    private int minimum;
    private int maximum;


    public Integer getMinimum() {
        return minimum;
    }

    public void setMinimum(Integer minimum) {
        this.minimum = minimum;
    }

    public Integer getMaximum() {
        return maximum;
    }

    public void setMaximum(Integer maximum) {
        this.maximum = maximum;
    }

    public void validate(FacesContext context,
                         UIComponent component,
                         Object value) throws ValidatorException {

        if ((context == null) || (component == null)) {
            throw new NullPointerException();
        }
        int converted = ((Number) value).intValue();
        if ((converted > maximum) || (converted < minimum)) {
            String message = MessageFormat
                  .format("Validation Error: {0} is not within the range of {1} and {2}",
                          converted, minimum, maximum);
            FacesMessage facesMessage =
                  new FacesMessage(FacesMessage.SEVERITY_ERROR,
                                   message,
                                   message);
            throw new ValidatorException(facesMessage);
        }

    }

}