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/*
* Copyright (c) 1997, 2020 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 jakarta.faces.application;
import java.util.Map;
import java.util.Set;
import jakarta.faces.context.FacesContext;
import jakarta.faces.flow.Flow;
/**
*
* ConfigurableNavigationHandler extends the contract of
* {@link NavigationHandler} to allow runtime inspection of the {@link NavigationCase}s that make up the rule-base for
* navigation. An implementation compliant with the version of the specification in which this class was introduced (or
* a later version) must make it so that its NavigationHandler is an extension of this class.
*
*
* @since 2.0
*/
public abstract class ConfigurableNavigationHandler extends NavigationHandler {
/**
*
* Return the {@link NavigationCase} representing the navigation that would be taken had
* {@link NavigationHandler#handleNavigation} been called with the same arguments or null if there is no
* such case.
*
*
* @param context The {@link FacesContext} for the current request
* @param fromAction The action binding expression that was evaluated to retrieve the specified outcome, or
* null if the outcome was acquired by some other means
* @param outcome The logical outcome returned by a previous invoked application action (which may be null)
* @return the navigation case, or null.
* @throws NullPointerException if context is null
* @since 2.0
*/
public abstract NavigationCase getNavigationCase(FacesContext context, String fromAction, String outcome);
/**
*
* Return the {@link NavigationCase} representing the navigation that would be taken had
* {@link NavigationHandler#handleNavigation} been called with the same arguments or null if there is no
* such case. Implementations that comply the version of the specification in which this method was introduced must
* override this method. For compatibility with decorated implementations that comply with an earlier version of the
* specification, an implementation is provided that simply calls through to
* {@link #getNavigationCase(jakarta.faces.context.FacesContext, java.lang.String, java.lang.String)}, ignoring the
* {@code toFlowDocumentId} parameter.
*
*
* @param context The {@link FacesContext} for the current request
* @param fromAction The action binding expression that was evaluated to retrieve the specified outcome, or
* null if the outcome was acquired by some other means
* @param outcome The logical outcome returned by a previous invoked application action (which may be null)
* @param toFlowDocumentId The value of the toFlowDocumentId property for the navigation case (which may be
* null)
* @return the navigation case, or null.
* @throws NullPointerException if context is null
* @since 2.2
*/
public NavigationCase getNavigationCase(FacesContext context, String fromAction, String outcome, String toFlowDocumentId) {
return getNavigationCase(context, fromAction, outcome);
}
/**
*
* Return a Map<String,
* Set<NavigationCase>> where the keys are <from-view-id> values and the values are
* Set<NavigationCase> where each element in the Set is a NavigationCase that applies to
* that <from-view-id>. The implementation must support live modifications to this Map.
*
*
* @return a map with navigation cases.
* @since 2.0
*/
public abstract Map> getNavigationCases();
/**
*
* A convenience method to signal the Jakarta Faces implementation to perform navigation with the provided
* outcome. When the NavigationHandler is invoked, the current viewId is treated as the "from viewId" and the "from
* action" is null.
*
*
* @param outcome the provided outcome.
* @throws IllegalStateException if this method is called after this instance has been released
*/
public void performNavigation(String outcome) {
this.handleNavigation(FacesContext.getCurrentInstance(), null, outcome);
}
/**
*
* Called by the flow system to cause the flow to be inspected for navigation rules. For backward compatibility with
* earlier implementations, an empty method is provided.
*
*
* @param context the Faces context.
* @param flow the flow.
* @since 2.2
*/
public void inspectFlow(FacesContext context, Flow flow) {
}
}