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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.context;
import java.util.Collection;
import java.util.List;
import jakarta.faces.application.ResourceHandler;
import jakarta.faces.application.StateManager;
import jakarta.faces.component.UIComponent;
import jakarta.faces.component.UINamingContainer;
import jakarta.faces.component.UIViewRoot;
import jakarta.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 = "jakarta.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 = "jakarta.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 = "jakarta.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 = "jakarta.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 jakarta.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>jakarta.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 jakarta.faces.event.PhaseId} that indicates the lifecycle phase the components will be
* processed in.
*/
public abstract void processPartial(PhaseId phaseId);
}