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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.component;
import java.util.Collection;
import javax.faces.component.visit.VisitCallback;
import javax.faces.component.visit.VisitContext;
import javax.faces.component.visit.VisitResult;
import javax.faces.context.FacesContext;
/**
* <p><strong class="changed_modified_2_0">UINamingContainer</strong> is a
* convenience base class for components that wish to implement {@link
* NamingContainer} functionality.</p>
*/
public class UINamingContainer extends UIComponentBase
implements NamingContainer, UniqueIdVendor, StateHolder {
// ------------------------------------------------------ Manifest Constants
/**
* <p>The standard component type for this component.</p>
*/
public static final String COMPONENT_TYPE = "javax.faces.NamingContainer";
/**
* <p>The standard component family for this component.</p>
*/
public static final String COMPONENT_FAMILY = "javax.faces.NamingContainer";
/**
* <p class="changed_added_2_0">The context-param that allows the separator
* char for clientId strings to be set on a per-web application basis.</p>
*
* @since 2.0
*/
public static final String SEPARATOR_CHAR_PARAM_NAME =
"javax.faces.SEPARATOR_CHAR";
enum PropertyKeys {
lastId
}
// ------------------------------------------------------------ Constructors
/**
* <p>Create a new {@link UINamingContainer} instance with default property
* values.</p>
*/
public UINamingContainer() {
super();
setRendererType(null);
}
// -------------------------------------------------------------- Properties
public String getFamily() {
return (COMPONENT_FAMILY);
}
/**
* <p class="changed_added_2_0">Return the character used to separate
* segments of a clientId. The implementation must determine if there is a
* <<code>context-param</code>> 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.</p>
*
* @param context the {@link FacesContext} for the current request
* @since 2.0
*/
public static char getSeparatorChar(FacesContext context) {
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;
}
/**
* @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<String> 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;
}
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);
}
}
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