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package javax.faces.component;
import java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
/**
* UINamingContainer is a
* convenience base class for components that wish to implement {@link
* NamingContainer} functionality.
*/
public class UINamingContainer extends UIComponentBase
implements NamingContainer, UniqueIdVendor, StateHolder {
// ------------------------------------------------------ Manifest Constants
private static Logger LOGGER = Logger.getLogger("javax.faces.component",
"javax.faces.LogStrings");
/**
* The standard component type for this component.
*/
public static final String COMPONENT_TYPE = "javax.faces.NamingContainer";
/**
* The standard component family for this component.
*/
public static final String COMPONENT_FAMILY = "javax.faces.NamingContainer";
/**
* The context-param that allows the separator
* char for clientId strings to be set on a per-web application basis.
*
* @since 2.0
*/
public static final String SEPARATOR_CHAR_PARAM_NAME =
"javax.faces.SEPARATOR_CHAR";
enum PropertyKeys {
lastId
}
// ------------------------------------------------------------ Constructors
/**
* Create a new {@link UINamingContainer} instance with default property
* values.
*/
public UINamingContainer() {
super();
setRendererType(null);
}
// -------------------------------------------------------------- Properties
@Override
public String getFamily() {
return (COMPONENT_FAMILY);
}
/**
* Return the character used to separate
* segments of a clientId. The implementation must determine if there is a
* <context-param> with the value given by the value of
* the symbolic constant {@link #SEPARATOR_CHAR_PARAM_NAME}. If there is a
* value for this param, the first character of the value must be returned
* from this method. Otherwise, the value of the symbolic constant {@link
* NamingContainer#SEPARATOR_CHAR} must be returned.
*
* @param context the {@link FacesContext} for the current request
* @return the separator char.
* @since 2.0
*/
public static char getSeparatorChar(FacesContext context) {
if (null == context) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE, "UINamingContainer.getSeparatorChar() called with null FacesContext. This indicates a SEREVER error. Returning {0}", NamingContainer.SEPARATOR_CHAR);
}
return NamingContainer.SEPARATOR_CHAR;
}
Character separatorChar =
(Character) context.getAttributes().get(SEPARATOR_CHAR_PARAM_NAME);
if (separatorChar == null) {
String initParam = context.getExternalContext().getInitParameter(SEPARATOR_CHAR_PARAM_NAME);
separatorChar = NamingContainer.SEPARATOR_CHAR;
if (initParam != null) {
initParam = initParam.trim();
if (initParam.length() != 0) {
separatorChar = initParam.charAt(0);
}
}
context.getAttributes().put(SEPARATOR_CHAR_PARAM_NAME, separatorChar);
}
return separatorChar;
}
/**
* @return true if tree should be visited, false otherwise.
* @see UIComponent#visitTree
*/
@Override
public boolean visitTree(VisitContext context,
VisitCallback callback) {
// NamingContainers can optimize partial tree visits by taking advantage
// of the fact that it is possible to detect whether any ids to visit
// exist underneath the NamingContainer. If no such ids exist, there
// is no need to visit the subtree under the NamingContainer.
Collection idsToVisit = context.getSubtreeIdsToVisit(this);
assert(idsToVisit != null);
// If we have ids to visit, let the superclass implementation
// handle the visit
if (!idsToVisit.isEmpty()) {
return super.visitTree(context, callback);
}
// If we have no child ids to visit, just visit ourselves, if
// we are visitable.
if (isVisitable(context)) {
FacesContext facesContext = context.getFacesContext();
pushComponentToEL(facesContext, null);
try {
VisitResult result = context.invokeVisitCallback(this, callback);
return (result == VisitResult.COMPLETE);
}
finally {
popComponentFromEL(facesContext);
}
}
// Done visiting this subtree. Return false to allow
// visit to continue.
return false;
}
@Override
public String createUniqueId(FacesContext context, String seed) {
Integer i = (Integer) getStateHelper().get(PropertyKeys.lastId);
int lastId = ((i != null) ? i : 0);
getStateHelper().put(PropertyKeys.lastId, ++lastId);
return UIViewRoot.UNIQUE_ID_PREFIX + (seed == null ? lastId : seed);
}
}