/* -*- 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 .
 */

#include <unotools/accessiblestatesethelper.hxx>
#include <tools/debug.hxx>

// defines how many states the bitfield can contain
// it has the size of 64 because I use a uInt64
#define BITFIELDSIZE 64

using namespace ::utl;
using namespace ::com::sun::star;
using namespace ::com::sun::star::accessibility;

class AccessibleStateSetHelperImpl
{
public:
    AccessibleStateSetHelperImpl();
    AccessibleStateSetHelperImpl(const AccessibleStateSetHelperImpl& rImpl);

    /// @throws uno::RuntimeException
    bool IsEmpty () const;
    /// @throws uno::RuntimeException
    bool Contains (sal_Int16 aState) const;
    /// @throws uno::RuntimeException
    uno::Sequence<sal_Int16> GetStates() const;
    /// @throws uno::RuntimeException
    void AddState(sal_Int16 aState);
    /// @throws uno::RuntimeException
    void RemoveState(sal_Int16 aState);

    inline void AddStates( const sal_Int64 _nStates );

private:
    sal_uInt64 maStates;
};

AccessibleStateSetHelperImpl::AccessibleStateSetHelperImpl()
    : maStates(0)
{
}

AccessibleStateSetHelperImpl::AccessibleStateSetHelperImpl(const AccessibleStateSetHelperImpl& rImpl)
    : maStates(rImpl.maStates)
{
}

inline bool AccessibleStateSetHelperImpl::IsEmpty () const
{
    return maStates == 0;
}

inline bool AccessibleStateSetHelperImpl::Contains (sal_Int16 aState) const
{
    DBG_ASSERT(aState < BITFIELDSIZE, "the statesset is too small");
    sal_uInt64 aTempBitSet(1);
    aTempBitSet <<= aState;
    return ((aTempBitSet & maStates) != 0);
}

inline uno::Sequence<sal_Int16> AccessibleStateSetHelperImpl::GetStates() const
{
    uno::Sequence<sal_Int16> aRet(BITFIELDSIZE);
    sal_Int16* pSeq = aRet.getArray();
    sal_Int16 nStateCount(0);
    for (sal_Int16 i = 0; i < BITFIELDSIZE; ++i)
        if (Contains(i))
        {
            *pSeq = i;
            ++pSeq;
            ++nStateCount;
        }
    aRet.realloc(nStateCount);
    return aRet;
}

inline void AccessibleStateSetHelperImpl::AddStates( const sal_Int64 _nStates )
{
    maStates |= _nStates;
}

inline void AccessibleStateSetHelperImpl::AddState(sal_Int16 aState)
{
    DBG_ASSERT(aState < BITFIELDSIZE, "the statesset is too small");
    sal_uInt64 aTempBitSet(1);
    aTempBitSet <<= aState;
    maStates |= aTempBitSet;
}

inline void AccessibleStateSetHelperImpl::RemoveState(sal_Int16 aState)
{
    DBG_ASSERT(aState < BITFIELDSIZE, "the statesset is too small");
    sal_uInt64 aTempBitSet(1);
    aTempBitSet <<= aState;
    aTempBitSet = ~aTempBitSet;
    maStates &= aTempBitSet;
}

//=====  internal  ============================================================

AccessibleStateSetHelper::AccessibleStateSetHelper ()
    : mpHelperImpl(new AccessibleStateSetHelperImpl)
{
}

AccessibleStateSetHelper::AccessibleStateSetHelper ( const sal_Int64 _nInitialStates )
    : mpHelperImpl(new AccessibleStateSetHelperImpl)
{
    mpHelperImpl->AddStates( _nInitialStates );
}

AccessibleStateSetHelper::AccessibleStateSetHelper (const AccessibleStateSetHelper& rHelper)
    : cppu::WeakImplHelper<XAccessibleStateSet>()
{
    if (rHelper.mpHelperImpl)
        mpHelperImpl.reset(new AccessibleStateSetHelperImpl(*rHelper.mpHelperImpl));
    else
        mpHelperImpl.reset(new AccessibleStateSetHelperImpl());
}

AccessibleStateSetHelper::~AccessibleStateSetHelper()
{
}

//=====  XAccessibleStateSet  ==============================================

    /** Checks whether the current state set is empty.

        @return
            Returns <TRUE/> if there is no state in this state set and
            <FALSE/> if there is at least one state set in it.
    */
sal_Bool SAL_CALL AccessibleStateSetHelper::isEmpty ()
{
    osl::MutexGuard aGuard (maMutex);
    return mpHelperImpl->IsEmpty();
}

    /** Checks if the given state is a member of the state set of this
        object.

        @param aState
            The state for which to check membership.  This has to be one of
            the constants of <type>AccessibleStateType</type>.

        @return
            Returns <TRUE/> if the given state is a member of this object's
            state set and <FALSE/> otherwise.
    */
sal_Bool SAL_CALL AccessibleStateSetHelper::contains (sal_Int16 aState)
{
    osl::MutexGuard aGuard (maMutex);
    return mpHelperImpl->Contains(aState);
}

    /** Checks if all of the given states are in this object's state
        set.

        @param aStateSet
            This sequence of states is interpreted as set and every of its
            members, duplicates are ignored, is checked for membership in
            this object's state set.  Each state has to be one of the
            constants of <type>AccessibleStateType</type>.

        @return
            Returns <TRUE/> if all states of the given state set are members
            of this object's state set.  <FALSE/> is returned if at least
            one of the states in the given state is not a member of this
            object's state set.
    */
sal_Bool SAL_CALL AccessibleStateSetHelper::containsAll
    (const uno::Sequence<sal_Int16>& rStateSet)
{
    osl::MutexGuard aGuard (maMutex);
    sal_Int32 nCount(rStateSet.getLength());
    const sal_Int16* pStates = rStateSet.getConstArray();
    sal_Int32 i = 0;
    bool bFound(true);
    while (i < nCount)
    {
        bFound = mpHelperImpl->Contains(pStates[i]);
        i++;
    }
    return bFound;
}

uno::Sequence<sal_Int16> SAL_CALL AccessibleStateSetHelper::getStates()
{
    osl::MutexGuard aGuard(maMutex);
    return mpHelperImpl->GetStates();
}

void AccessibleStateSetHelper::AddState(sal_Int16 aState)
{
    osl::MutexGuard aGuard (maMutex);
    mpHelperImpl->AddState(aState);
}

void AccessibleStateSetHelper::RemoveState(sal_Int16 aState)
{
    osl::MutexGuard aGuard (maMutex);
    mpHelperImpl->RemoveState(aState);
}

//=====  XTypeProvider  =======================================================

uno::Sequence< css::uno::Type> AccessibleStateSetHelper::getTypes()
{
    css::uno::Sequence< css::uno::Type> aTypeSequence {
        cppu::UnoType<XAccessibleStateSet>::get(),
        cppu::UnoType<lang::XTypeProvider>::get()
    };
    return aTypeSequence;
}

uno::Sequence<sal_Int8> SAL_CALL AccessibleStateSetHelper::getImplementationId()
{
    return css::uno::Sequence<sal_Int8>();
}

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