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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_UCBHELPER_INTERCEPTEDINTERACTION_HXX
#define INCLUDED_UCBHELPER_INTERCEPTEDINTERACTION_HXX
#include <vector>
#include <com/sun/star/task/XInteractionHandler.hpp>
#include <com/sun/star/task/XInteractionRequest.hpp>
#include <cppuhelper/implbase.hxx>
#include <ucbhelper/ucbhelperdllapi.h>
namespace ucbhelper{
/** @short it wraps any other interaction handler and intercept
its handle() requests.
@descr This class can be used as:
- instance if special interactions must be suppressed
only
- or as base class if interactions must be modified.
*/
class UCBHELPER_DLLPUBLIC InterceptedInteraction : public ::cppu::WeakImplHelper< css::task::XInteractionHandler >
{
// types
public:
struct InterceptedRequest
{
/** @short marks an Handle as invalid.
*/
static const sal_Int32 INVALID_HANDLE = -1;
/** @short contains the interaction request, which should be intercepted. */
css::uno::Any Request;
/** @short specify the fix continuation, which must be selected, if the
interaction could be intercepted successfully.
*/
css::uno::Type Continuation;
/** @short it's an unique identifier, which must be managed by the outside code.
@descr If there is a derived class, which overwrites the InterceptedInteraction::intercepted()
method, it will be called with a reference to an InterceptedRequest struct.
Then it can use the handle to react without checking the request type again.
*/
sal_Int32 Handle;
/** @short default ctor.
@descr Such constructed object can't be used really.
Might it will crash if its used!
Don't forget to initialize all(!) members ...
*/
InterceptedRequest()
{
Handle = INVALID_HANDLE;
}
};
/** @short represent the different states, which can occur
as result of an interception.
@see impl_interceptRequest()
*/
enum EInterceptionState
{
/** none of the specified interceptions match the incoming request */
E_NOT_INTERCEPTED,
/** the request could be intercepted - but the specified continuation could not be located.
That's normally an error of the programmer. May be the interaction request does not use
the right set of continuations ... or the interception list contains the wrong continuation. */
E_NO_CONTINUATION_FOUND,
/** the request could be intercepted and the specified continuation could be selected successfully. */
E_INTERCEPTED
};
// member
protected:
/** @short reference to the intercepted interaction handler.
@descr NULL is allowed for this member!
All interaction will be aborted then ...
expecting th handle() was overwritten by
a derived class.
*/
css::uno::Reference< css::task::XInteractionHandler > m_xInterceptedHandler;
/** @short these list contains the requests, which should be intercepted.
*/
::std::vector< InterceptedRequest > m_lInterceptions;
// native interface
public:
/** @short initialize a new instance with default values.
*/
InterceptedInteraction();
/** @short initialize a new instance with the interaction handler,
which should be intercepted.
@attention If such interaction handler isn't set here,
all incoming requests will be aborted ...
if the right continuation is available!
@param xInterceptedHandler
the outside interaction handler, which should
be intercepted here.
*/
void setInterceptedHandler(const css::uno::Reference< css::task::XInteractionHandler >& xInterceptedHandler);
/** @short set a new list of intercepted interactions.
@attention If the interface method handle() will be overwritten by
a derived class, the functionality behind these static list
can't be used.
@param lInterceptions
the list of intercepted requests.
*/
void setInterceptions(const ::std::vector< InterceptedRequest >& lInterceptions);
/** @short extract a requested continuation from the list of available ones.
@param lContinuations
the list of available continuations.
@param aType
is used to locate the right continuation,
by checking its interface type.
@return A valid reference to the continuation, if it could be located...
or an empty reference otherwise.
*/
static css::uno::Reference< css::task::XInteractionContinuation > extractContinuation(
const css::uno::Sequence< css::uno::Reference< css::task::XInteractionContinuation > >& lContinuations,
const css::uno::Type& aType );
// useable for derived classes
protected:
/** @short can be overwritten by a derived class to handle interceptions
outside.
@descr This base implementation checks, if the request could be intercepted
successfully. Then this method intercepted() is called.
The default implementation returns "NOT_INTERCEPTED" every time.
So the method impl_interceptRequest() uses the right continuation automatically.
If this method was overwritten and something different "NO_INTERCEPTED"
is returned, the method impl_interceptRequest() will return immediately with
the result, which is returned by this intercepted() method.
Then the continuations must be selected inside the intercepted() call!
@param rRequest
it points to the intercepted request (means the item of the
set interception list). e.g. its "Handle" member can be used
to identify it and react very easy, without the need to check the
type of the exception ...
@param xOrgRequest
points to the original interaction, which was intercepted.
It provides access to the exception and the list of possible
continuations.
@return The result of this operation.
Note: If E_NOT_INTERCEPTED is returned the default handling of the base class
will be used automatically for this request!
*/
virtual EInterceptionState intercepted(const InterceptedRequest& rRequest ,
const css::uno::Reference< css::task::XInteractionRequest >& xOrgRequest);
// uno interface
public:
/** @short implements the default handling of this class...
or can be overwritten by any derived class.
@descr If no further class is derived from this one
-> the default implementation is used. Then the
internal list of requests is used to handle different
interactions automatically.
(see impl_interceptRequest())
If this method was overwritten by a derived implementation
-> the new implementation has to do everything by itself.
Of course it can access all members/helpers and work with it.
But the default implementation is not used automatically then.
@param xRequest
the interaction request, which should be intercepted.
*/
virtual void SAL_CALL handle(const css::uno::Reference< css::task::XInteractionRequest >& xRequest) override;
// helper
private:
/** @short implements the default handling:
- intercept or forward to internal handler.
*/
UCBHELPER_DLLPRIVATE void impl_handleDefault(const css::uno::Reference< css::task::XInteractionRequest >& xRequest);
/** @short implements the interception of requests.
@descr The incoming request will be analyzed, if it match
any request of the m_lIntercepions list.
If an interception could be found, its continuation will be
searched and selected.
The method return the state of that operation.
But it doesn't call the intercepted and here set
interaction handler. That has to be done in the outside method.
@param xRequest
the interaction request, which should be intercepted.
@return A identifier, which inidicates if the request was intercepted,
the continuation was found and selected ... or not.
*/
UCBHELPER_DLLPRIVATE EInterceptionState impl_interceptRequest(const css::uno::Reference< css::task::XInteractionRequest >& xRequest);
};
} // namespace ucbhelper
#endif // INCLUDED_UCBHELPER_INTERCEPTEDINTERACTION_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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