0,0 → 1,56 |
/** |
* Extends and based on Apache Struts source code. |
* |
* Copyleft Anatoli Klassen (anatoli@aksoft.net) |
*/ |
package ak.strutsx.taglib; |
|
import java.util.Iterator; |
import java.util.Collection; |
import java.util.Map; |
import javax.servlet.jsp.JspException; |
import org.apache.struts.util.RequestUtils; |
import org.apache.struts.taglib.logic.ConditionalTagBase; |
|
public class EmptyTag |
extends ConditionalTagBase |
{ |
protected boolean condition() |
throws JspException |
{ |
return condition(true); |
} |
|
protected boolean condition(boolean desired) |
throws JspException |
{ |
if(this.name == null) { |
JspException e = new JspException(messages.getMessage("empty.noNameAttribute")); |
RequestUtils.saveException(pageContext, e); |
throw e; |
} |
|
boolean empty = true; |
|
Object value = null; |
if(this.property == null) |
value = RequestUtils.lookup(pageContext, name, scope); |
else |
value = RequestUtils.lookup(pageContext, name, property, scope); |
|
if(value != null) { |
if(value instanceof String) |
empty = (((String)value).length() < 1); |
else if(value instanceof Collection) |
empty = ((Collection)value).isEmpty(); |
else if(value instanceof Map) |
empty = ((Map)value).isEmpty(); |
else if(value instanceof Iterator) |
empty = !((Iterator)value).hasNext(); |
else |
empty = false; |
} |
|
return (empty == desired); |
} |
} |