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package javax.faces.context;
import java.util.Collection;
import java.util.List;
import javax.faces.application.ResourceHandler;
import javax.faces.application.StateManager;
import javax.faces.component.UIComponent;
import javax.faces.component.UINamingContainer;
import javax.faces.component.UIViewRoot;
import javax.faces.event.PhaseId;
/**
* PartialViewContext
* contains methods and properties that pertain to partial request
* processing and partial response rendering on a view.
*
* The {@link PartialViewContext} instance is used to determine if
* the current request indicates the requirement to perform
* partial processing and/or partial rendering.
* Partial processing is the processing of selected components
* through the execute portion of the request processing
* lifecycle. Partial rendering is the rendering of specified
* components in the Render Response Phase of the
* request processing lifecycle.
*
*/
public abstract class PartialViewContext {
/**
*
* The request parameter name whose request parameter value identifies the type of partial event.
*
* @since 2.3
*/
public static final String PARTIAL_EVENT_PARAM_NAME =
"javax.faces.partial.event";
/**
*
* The request parameter name whose request parameter value
* is a Collection of client identifiers identifying the
* components that must be processed during the
* Render Response phase of the request processing
* lifecycle.
*
* @since 2.0
*/
public static final String PARTIAL_RENDER_PARAM_NAME =
"javax.faces.partial.render";
/**
*
* The request parameter name whose request parameter value
* is a Collection of client identifiers identifying the
* components that must be processed during the
* Apply Request Values, Process Validations,
* and Update Model Values phases of the request
* processing lifecycle.
*
* @since 2.0
*/
public static final String PARTIAL_EXECUTE_PARAM_NAME =
"javax.faces.partial.execute";
/**
*
* If the request parameter named by the value of this constant has
* a parameter value of true, the implementation
* must return true from {@link #isResetValues}.
*
* @since 2.2
*/
public static final String RESET_VALUES_PARAM_NAME =
"javax.faces.partial.resetValues";
/**
*
* The value that when used with {@link #PARTIAL_EXECUTE_PARAM_NAME}
* or {@link #PARTIAL_RENDER_PARAM_NAME} indicates these phases
* must be skipped.
*
* @since 2.0
*/
public static final String ALL_PARTIAL_PHASE_CLIENT_IDS = "@all";
// -------------------------------------------------------------- Properties
/**
* Return a
* Collection of client identifiers from the current request
* with the request parameter name {@link #PARTIAL_EXECUTE_PARAM_NAME}.
* If there is no such request parameter, return an empty Collection.
* These client identifiers are used to identify components that
* will be processed during the execute phase of the
* request processing lifecycle. The returned Collection is
* mutable.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return the ids for the execute portion of the lifecycle
*/
public abstract Collection getExecuteIds();
/**
* Return a
* Collection of client identifiers from the current request
* with the request parameter name {@link #PARTIAL_RENDER_PARAM_NAME}.
* If there is no such request parameter, return an empty Collection.
* These client identifiers are used to identify components that
* will be processed during the render phase of the
* request processing lifecycle. The returned Collection is
* mutable.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return the ids for the render portion of the lifecycle
*/
public abstract Collection getRenderIds();
/**
*
* Returns a mutable List of scripts to be evaluated in client side on complete of ajax request.
*
*
* @return A mutable List of scripts to be evaluated in client side on complete of ajax request.
* @throws IllegalStateException If this method is called after this instance has been released.
* @since 2.3
*/
public abstract List getEvalScripts();
/**
* Return the {@link ResponseWriter}
* to which components should
* direct their output for partial view rendering. Within a given
* response, components can use either the ResponseStream or the
* ResponseWriter, but not both.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return the {@code ResponseWriter} for output
*/
public abstract PartialResponseWriter getPartialResponseWriter();
/**
*
* Return true if the request header
* Faces-Request is present with the value
* partial/ajax.
* Otherwise, return false.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return whether or not this is an ajax request
*/
public abstract boolean isAjaxRequest();
/**
*
* Return true {@link #isAjaxRequest} returns
* true or if the request header
* Faces-Request is present with the value
* partial/process.
* Otherwise, return false.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return whether or not this request is partial
*/
public abstract boolean isPartialRequest();
/**
*
* Return true if {@link #isAjaxRequest}
* returns true and {@link #PARTIAL_EXECUTE_PARAM_NAME}
* is present in the current request with the value
* {@link #ALL_PARTIAL_PHASE_CLIENT_IDS}.
* Otherwise, return false.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return whether or not this is an execute all request
*/
public abstract boolean isExecuteAll();
/**
*
* Return true if {@link #isAjaxRequest}
* returns true and {@link #PARTIAL_RENDER_PARAM_NAME}
* is present in the current request with the value
* {@link #ALL_PARTIAL_PHASE_CLIENT_IDS}.
* Otherwise, return false.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*
* @return whether or not this is a render all request
*/
public abstract boolean isRenderAll();
/**
* Return true if
* the incoming request has a parameter named by the value of {@link #RESET_VALUES_PARAM_NAME}
* and that value is true. To preserve backward compatibility
* with custom implementations that may have extended from an earlier
* version of this class, an implementation is provided that returns
* false. A compliant implementation must override this
* method to take the specified action.
*
* @since 2.2
*
* @return whether or not this is a reset values request
*/
public boolean isResetValues() {
return false;
}
/**
*
* Indicate the entire view must be rendered if
* renderAll is true.
*
* @param renderAll the value true indicates
* the entire view must be rendered.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*/
public abstract void setRenderAll(boolean renderAll);
/**
*
* Dynamically indicate that this is a partial request.
*
* @param isPartialRequest the value true indicates
* this is a partial request.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*
* @since 2.0
*/
public abstract void setPartialRequest(boolean isPartialRequest);
/**
* Release any
* resources associated with this PartialViewContext
* instance.
*
* @throws IllegalStateException if this method is called after
* this instance has been released
*/
public abstract void release();
/**
* Perform lifecycle processing on components during the indicated
* phaseId. Only those components with identifiers existing in the Collection returned
* from {@link #getExecuteIds} and {@link #getRenderIds} will be processed.
*
*
* When the indicated phaseId equals {@link PhaseId#RENDER_RESPONSE}, then perform the following
* tasks in sequence:
*
- If {@link #isResetValues()} returns
true, then call
* {@link UIViewRoot#resetValues(FacesContext, Collection)}, passing {@link #getRenderIds()}.
* - If {@link #isRenderAll()} returns
false, then render any component resource of
* {@link UIViewRoot} whose {@link ResourceHandler#getRendererTypeForResourceName(String)} does not return
* null, and whose {@link UIComponent#getChildCount()} is zero, and whose
* {@link ResourceHandler#isResourceRendered(FacesContext, String, String)} returns false, in an
* update element with an identifier of javax.faces.Resource.
* - Process the components.
* - Obtain the state by calling {@link StateManager#getViewState} and write it out as an
update
* element with an identifier of <VIEW_ROOT_CONTAINER_CLIENT_ID><SEP>javax.faces.ViewState
* where <VIEW_ROOT_CONTAINER_CLIENT_ID> is the return from
* {@link UIViewRoot#getContainerClientId(FacesContext)} on the view from whence this state originated, and
* <SEP> is the currently configured {@link UINamingContainer#getSeparatorChar(FacesContext)}.
*
* - If {@link #isRenderAll()} returns
false, then write out each script of {@link #getEvalScripts()}
* as an eval element.
*
*
* @param phaseId the {@link javax.faces.event.PhaseId} that indicates
* the lifecycle phase the components will be processed in.
*/
public abstract void processPartial(PhaseId phaseId);
}