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package standard;
import javax.faces.context.FacesContext;
import javax.faces.event.ValueChangeEvent;
import javax.faces.event.ValueChangeListener;
/** <p>Log the occurrence of this event.</p> */
public class LogValueChangedListener implements ValueChangeListener {
// --------------------------------------------- ValueChangeListener Methods
/**
* <p>Log the event.</p>
*
* @param event {@link ValueChangeEvent} that is being processed
*/
public void processValueChange(ValueChangeEvent event) {
FacesContext context = FacesContext.getCurrentInstance();
append(context, "ValueChangeEvent(" +
event.getComponent().getClientId(context) + "," +
event.getOldValue() + "," + event.getNewValue() + ")");
}
private void append(FacesContext context, String value) {
String message = (String)
context.getExternalContext().getRequestMap().get("message");
if (message == null) {
message = "";
}
message += "<li>" + value + "</li>";
context.getExternalContext().getRequestMap().put("message", message);
}
}