| 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); |
| } |
| } |