package pt.ist.renderers.validators;

public class UrlValidator extends HtmlValidator {

    private static final String[] validSchemes = new String[] { "http", "https" };

    private static final String DEFAULT_SCHEME = "http";

    private boolean required;

    /**
     * Required constructor.
     */
    public UrlValidator() {
	super();
	setKey(true);
	setMessage("renderers.validator.url");
	setRequired(true);
    }

    public UrlValidator(HtmlChainValidator htmlChainValidator) {
	super(htmlChainValidator);
	// default messsage
	setKey(true);
	setMessage("renderers.validator.url");
	setRequired(true);
    }

    public boolean isRequired() {
	return this.required;
    }

    public void setRequired(boolean required) {
	this.required = required;
    }

    @Override
    public void performValidation() {
	if (hasValue()) {
	    org.apache.commons.validator.UrlValidator urlValidator = new org.apache.commons.validator.UrlValidator(validSchemes);
	    setValid(urlValidator.isValid(buildUrlForValidation()));
	} else {
	    setValid(!isRequired());
	}
    }

    private boolean hasValue() {
	return (getComponent().getValue() != null && getComponent().getValue().length() > 0);
    }

    private String buildUrlForValidation() {
	String url = getComponent().getValue();
	for (String scheme : validSchemes) {
	    if (url.startsWith(scheme)) {
		return url;
	    }
	}

	return DEFAULT_SCHEME + "://" + url;
    }
}