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JSR-000372: JavaServer(TM) Faces 2.3 API
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package javax.faces.component;
import static com.sun.faces.util.Util.coalesce;
import static java.util.logging.Level.SEVERE;
import static javax.faces.component.UIViewRoot.UNIQUE_ID_PREFIX;
import static javax.faces.component.visit.VisitResult.COMPLETE;
import java.util.Collection;
import java.util.logging.Logger;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
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 (context == null) {
if (LOGGER.isLoggable(SEVERE)) {
LOGGER.log(SEVERE, "UINamingContainer.getSeparatorChar() called with null FacesContext. This indicates a SEVERE error. Returning {0}",
SEPARATOR_CHAR);
}
return 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 = 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);
// 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 {
return context.invokeVisitCallback(this, callback) == 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) {
int lastId = coalesce(getLastId(), 0);
setLastId(++lastId);
return UNIQUE_ID_PREFIX + coalesce(seed, lastId);
}
// ----------------------------------------------------- Private Methods
private Integer getLastId() {
return (Integer) getStateHelper().get(PropertyKeys.lastId);
}
private void setLastId(Integer lastId) {
getStateHelper().put(PropertyKeys.lastId, lastId);
}
}