UICaptcha.java

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 * JBoss by Red Hat                                                           *
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package org.exoplatform.portal.webui.register;

import java.util.Calendar;

import javax.portlet.RenderResponse;
import javax.portlet.ResourceURL;

import org.exoplatform.portal.url.URLWriter;
import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.form.UIFormStringInput;

/**
 * @author <a href="mailto:theute@redhat.com">Thomas Heute</a>
 * @version $Revision$
 */
public class UICaptcha extends UIFormStringInput {

    private static final String GTN_PREFIX = "gtn";

    public UICaptcha(String name, String bindingExpression, String value) {
        super(name, bindingExpression, value);
    }

    public void processRender(WebuiRequestContext context) throws Exception {

        RenderResponse resp = context.getResponse();

        ResourceURL url = resp.createResourceURL();

        // context.getPortalContextPath() + "/captcha?v=" + Calendar.getInstance().getTimeInMillis()
        // Random parameter
        url.setParameter("v", String.valueOf(System.currentTimeMillis()));

        context.getWriter().write(new StringBuilder().append("<div id='")
                .append(GTN_PREFIX).append(getId()).append("'><img src=\"")
                .append(URLWriter.toString(url)).append("\" alt=\"Captcha image for visual validation\" /><br/>").toString());
        super.processRender(context);
        context.getWriter().write("</div>");
    }

}