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/*
 * 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); } }




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