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package javax.faces.application;
import java.util.
Map;
import java.util.
Set;
import javax.faces.context.
FacesContext;
import javax.faces.flow.
Flow;
/**
* <p
* class="changed_added_2_0"><strong class="changed_modified_2_2">ConfigurableNavigationHandler</strong>
* 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 <code>NavigationHandler</code> is an
* extension of this class.</p>
*
* @since 2.0
*/
public abstract class
ConfigurableNavigationHandler extends
NavigationHandler {
/**
* <p class="changed_added_2_0">Return the {@link NavigationCase}
* representing the navigation that would be taken had {@link
* NavigationHandler#handleNavigation} been called with the same
* arguments or <code>null</code> if there is no such case.</p>
*
* @param context The {@link FacesContext} for the current request
* @param fromAction The action binding expression that was evaluated
* to retrieve the specified outcome, or <code>null</code> if the
* outcome was acquired by some other means
* @param outcome The logical outcome returned by a previous invoked
* application action (which may be <code>null</code>)
*
* @throws NullPointerException if <code>context</code>
* is <code>null</code>
*
* @since 2.0
*/
public abstract
NavigationCase getNavigationCase(
FacesContext context,
String fromAction,
String outcome);
/**
* <p class="changed_added_2_2">Return the {@link NavigationCase}
* representing the navigation that would be taken had {@link
* NavigationHandler#handleNavigation} been called with the same
* arguments or <code>null</code> 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(javax.faces.context.FacesContext, java.lang.String, java.lang.String)},
* ignoring the {@code toFlowDocumentId} parameter.</p>
*
* @param context The {@link FacesContext} for the current request
* @param fromAction The action binding expression that was evaluated
* to retrieve the specified outcome, or <code>null</code> if the
* outcome was acquired by some other means
* @param outcome The logical outcome returned by a previous invoked
* application action (which may be <code>null</code>)
* @param toFlowDocumentId The value of the <code>toFlowDocumentId</code> property
* for the navigation case (which may be <code>null</code>)
*
* @throws NullPointerException if <code>context</code>
* is <code>null</code>
*
* @since 2.2
*/
public
NavigationCase getNavigationCase(
FacesContext context,
String fromAction,
String outcome,
String toFlowDocumentId) {
return
getNavigationCase(
context,
fromAction,
outcome);
}
/**
* <p class="changed_added_2_0">Return a <code>Map<String,
* Set<NavigationCase>></code> where the keys are
* <code><from-view-id></code> values and the values are
* <code>Set<NavigationCase></code> where each element in the
* Set is a <code>NavigationCase</code> that applies to that
* <code><from-view-id></code>. The implementation must
* support live modifications to this <code>Map</code>.</p>
*
* @since 2.0
*/
public abstract
Map<
String,
Set<
NavigationCase>>
getNavigationCases();
/**
* <p class="changed_added_2_0">A convenience method to signal the
* JavaServer 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.</p>
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*/
public void
performNavigation(
String outcome) {
this.
handleNavigation(
FacesContext.
getCurrentInstance(), null,
outcome);
}
/**
* <p class="changed_added_2_2">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.</p>
*
*
* @since 2.2
*/
public void
inspectFlow(
FacesContext context,
Flow flow) {
}
}