/*
 * $Id: UIOutputEmailTag.java,v 1.1 2003/06/20 16:48:49 jack Exp $
 * 
 */
package net.jackwind.jsf;

import javax.faces.component.UIComponent;
import javax.faces.webapp.UIComponentTag;

/**
 * @author 	JACK	(Jun 19, 2003)
 * @class 	UIOutputEmail
 */
public class UIOutputEmailTag extends UIComponentTag {

	private String valueRef;
	private String value;

	protected String getComponentType() {
		return "UIOutputEmail";
	}

	public void setValue(String value) {
		this.value = value;
	}

	public String getValue() {
		return value;
	}

	public String getValueRef() {
		return valueRef;
	}

	public void setValueRef(String newValueRef) {
		valueRef = newValueRef;
	}

	public String getRendererType() {
		return null;
	}

	protected void overrideProperties(UIComponent component) {
		super.overrideProperties(component);
		UIOutputEmail email = (UIOutputEmail) component;

		if (value != null) {
			email.setValue(value);
		}
		
		if(email.getValueRef() == null && valueRef != null) {
			email.setValueRef(valueRef);
		}
			
	}

}

<?xml version="1.0" ?>
<!DOCTYPE taglib
  PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
  "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">

<taglib>
   <tlib-version>1.0</tlib-version>
   <jsp-version>1.2</jsp-version>
   <short-name>JSF Email Component by Jack Li Guojie.</short-name>
   <display-name>JSF Email Component by Jack Li Guojie.</display-name>
   <description>
   This library contains custom email component for JSF
   </description>

   <tag>
      <name>output_email</name>
      <tag-class>net.jackwind.jsf.UIOutputEmailTag</tag-class>
      <body-content>JSP</body-content>
      <description>JSF Email Component by Jack Li Guojie.
   </description>
      <attribute>
         <name>id</name>
         <required>false</required>
         <rtexprvalue>false</rtexprvalue>
      </attribute>
      <attribute>
      	<name>value</name>
      	<required>false</required>
      	<rtexprvalue>false</rtexprvalue>
      </attribute>
      <attribute>
      	<name>valueRef</name>
      	<required>false</required>
      	<rtexprvalue>false</rtexprvalue>
      </attribute>
   </tag>
</taglib>

<jack:output_email id="outemail" value="jack@jackwind.net" />

/*
 * $Id: UIOutputEmail.java,v 1.1 2003/06/20 16:48:49 jack Exp $
 * 
 */
package net.jackwind.jsf;

import java.io.IOException;
import java.util.StringTokenizer;

import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

/**
 * @author 	JACK	(Jun 19, 2003)
 * @class 	UIOutputEmail
 */
public class UIOutputEmail extends UIOutput {
	private String host;
	private String user;
	
	private void parseEmail(String email) {
		StringTokenizer st = new StringTokenizer(email, "@");
		if (st.countTokens() != 2)
			throw new IllegalArgumentException(
				"Invalid email address: " + email);
		user = st.nextToken();
		host = st.nextToken();
	}
	
	// This method indicates whether this component renders itself
	// or delegates rendering to a renderer.
	public boolean getRendersSelf() { 
	   return true; 
	}
	
	// Called during the Render Response phase
	public void encodeEnd(FacesContext context) throws IOException {
		if(user == null || host == null) {
			try {
				parseEmail((String)currentValue(context));
			}catch(Exception e) {
				LogUtil.log(e);
			}
		}
		ResponseWriter writer = context.getResponseWriter();
		
		// Represent this component as HTML with JavaScripts
		writer.write("<script language='JavaScript'>\n");
		writer.write("function emailAddress(host, user) { \n");
		writer.write("document.write('<a href=\"mailto:');\n");
		writer.write("document.write(user + '@' + host);\n");
		writer.write("document.write('\">');\n");
		writer.write("document.write(user + '@' + host);\n");
		writer.write("document.write(\"</a>\");\n}\n\n");
		writer.write("emailAddress('" + host + "', '" + 
		  user + "');\n");
		writer.write("</script>\n");
	}

	protected String getComponentType() {
		return "output_email";
	}
}

  <!-- ============== Custom components ========================= -->
  <component>
  	<component-type>UIOutputEmail</component-type>
  	<component-class>net.jackwind.jsf.UIOutputEmail</component-class>
  </component>

<%@ taglib uri="/WEB-INF/jsf-demo-jack.tld" prefix="jack" %>
...
<jack:output_email id="outemail" valueRef="subscriberBean.email" />

<script language='JavaScript'>
function emailAddress(host, user) { 
document.write('<a href="mailto:');
document.write(user + '@' + host);
document.write('">');
document.write(user + '@' + host);
document.write("</a>");
}

emailAddress('jackwind.net', 'jack');
</script>