AOO410/main/comphelper/source/container/enumhelper.cxx

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 * Licensed to the Apache Software Foundation (ASF) under one
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 * 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
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 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_comphelper.hxx"
#include <comphelper/enumhelper.hxx>
#include <com/sun/star/lang/XComponent.hpp>

//.........................................................................
namespace comphelper
{
//.........................................................................

//==================================================================
//= OEnumerationByName
//==================================================================
//------------------------------------------------------------------------------
OEnumerationByName::OEnumerationByName(const staruno::Reference<starcontainer::XNameAccess>& _rxAccess)
    :m_aNames(_rxAccess->getElementNames())
    ,m_nPos(0)
    ,m_xAccess(_rxAccess)
    ,m_bListening(sal_False)
{
    impl_startDisposeListening();
}

//------------------------------------------------------------------------------
OEnumerationByName::OEnumerationByName(const staruno::Reference<starcontainer::XNameAccess>& _rxAccess,
                                       const staruno::Sequence< ::rtl::OUString >&           _aNames  )
    :m_aNames(_aNames)
    ,m_nPos(0)
    ,m_xAccess(_rxAccess)
    ,m_bListening(sal_False)
{
    impl_startDisposeListening();
}

//------------------------------------------------------------------------------
OEnumerationByName::~OEnumerationByName()
{
    impl_stopDisposeListening();
}

//------------------------------------------------------------------------------
sal_Bool SAL_CALL OEnumerationByName::hasMoreElements(  ) throw(staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

	if (m_xAccess.is() && m_aNames.getLength() > m_nPos)
        return sal_True;

    if (m_xAccess.is())
    {
        impl_stopDisposeListening();
        m_xAccess.clear();
    }

    return sal_False;
}

//------------------------------------------------------------------------------
staruno::Any SAL_CALL OEnumerationByName::nextElement(  )
		throw(starcontainer::NoSuchElementException, starlang::WrappedTargetException, staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

	staruno::Any aRes;
	if (m_xAccess.is() && m_nPos < m_aNames.getLength())
		aRes = m_xAccess->getByName(m_aNames.getConstArray()[m_nPos++]);

	if (m_xAccess.is() && m_nPos >= m_aNames.getLength())
    {
        impl_stopDisposeListening();
        m_xAccess.clear();
    }

	if (!aRes.hasValue())		// es gibt kein Element mehr
		throw starcontainer::NoSuchElementException();

	return aRes;
}

//------------------------------------------------------------------------------
void SAL_CALL OEnumerationByName::disposing(const starlang::EventObject& aEvent)
        throw(staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

    if (aEvent.Source == m_xAccess)
        m_xAccess.clear();
}

//------------------------------------------------------------------------------
void OEnumerationByName::impl_startDisposeListening()
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

    if (m_bListening)
        return;

    ++m_refCount;
    staruno::Reference< starlang::XComponent > xDisposable(m_xAccess, staruno::UNO_QUERY);
    if (xDisposable.is())
    {
        xDisposable->addEventListener(this);
        m_bListening = sal_True;
    }
    --m_refCount;
}

//------------------------------------------------------------------------------
void OEnumerationByName::impl_stopDisposeListening()
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

    if (!m_bListening)
        return;

    ++m_refCount;
    staruno::Reference< starlang::XComponent > xDisposable(m_xAccess, staruno::UNO_QUERY);
    if (xDisposable.is())
    {
        xDisposable->removeEventListener(this);
        m_bListening = sal_False;
    }
    --m_refCount;
}

//==================================================================
//= OEnumerationByIndex
//==================================================================
//------------------------------------------------------------------------------
OEnumerationByIndex::OEnumerationByIndex(const staruno::Reference< starcontainer::XIndexAccess >& _rxAccess)
    :m_nPos(0)
    ,m_xAccess(_rxAccess)
    ,m_bListening(sal_False)
{
    impl_startDisposeListening();
}

//------------------------------------------------------------------------------
OEnumerationByIndex::~OEnumerationByIndex()
{
    impl_stopDisposeListening();
}

//------------------------------------------------------------------------------
sal_Bool SAL_CALL OEnumerationByIndex::hasMoreElements(  ) throw(staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

	if (m_xAccess.is() && m_xAccess->getCount() > m_nPos)
        return sal_True;

    if (m_xAccess.is())
    {
        impl_stopDisposeListening();
        m_xAccess.clear();
    }

    return sal_False;
}

//------------------------------------------------------------------------------
staruno::Any SAL_CALL OEnumerationByIndex::nextElement(  )
		throw(starcontainer::NoSuchElementException, starlang::WrappedTargetException, staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

	staruno::Any aRes;
	if (m_xAccess.is())
	{
		aRes = m_xAccess->getByIndex(m_nPos++);
		if (m_nPos >= m_xAccess->getCount())
        {
            impl_stopDisposeListening();
            m_xAccess.clear();
        }
	}

	if (!aRes.hasValue())		// es gibt kein Element mehr
		throw starcontainer::NoSuchElementException();
	return aRes;
}

//------------------------------------------------------------------------------
void SAL_CALL OEnumerationByIndex::disposing(const starlang::EventObject& aEvent)
        throw(staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

    if (aEvent.Source == m_xAccess)
        m_xAccess.clear();
}

//------------------------------------------------------------------------------
void OEnumerationByIndex::impl_startDisposeListening()
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

    if (m_bListening)
        return;

    ++m_refCount;
    staruno::Reference< starlang::XComponent > xDisposable(m_xAccess, staruno::UNO_QUERY);
    if (xDisposable.is())
    {
        xDisposable->addEventListener(this);
        m_bListening = sal_True;
    }
    --m_refCount;
}

//------------------------------------------------------------------------------
void OEnumerationByIndex::impl_stopDisposeListening()
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

    if (!m_bListening)
        return;

    ++m_refCount;
    staruno::Reference< starlang::XComponent > xDisposable(m_xAccess, staruno::UNO_QUERY);
    if (xDisposable.is())
    {
        xDisposable->removeEventListener(this);
        m_bListening = sal_False;
    }
    --m_refCount;
}

//==================================================================
//= OAnyEnumeration
//==================================================================

//------------------------------------------------------------------------------
OAnyEnumeration::OAnyEnumeration(const staruno::Sequence< staruno::Any >& lItems)
    :m_nPos(0)
    ,m_lItems(lItems)
{
}

//------------------------------------------------------------------------------
OAnyEnumeration::~OAnyEnumeration()
{
}

//------------------------------------------------------------------------------
sal_Bool SAL_CALL OAnyEnumeration::hasMoreElements(  ) throw(staruno::RuntimeException)
{
    ::osl::ResettableMutexGuard aLock(m_aLock);

	return (m_lItems.getLength() > m_nPos);
}

//------------------------------------------------------------------------------
staruno::Any SAL_CALL OAnyEnumeration::nextElement(  )
		throw(starcontainer::NoSuchElementException, starlang::WrappedTargetException, staruno::RuntimeException)
{
	if ( ! hasMoreElements())
		throw starcontainer::NoSuchElementException();
    
    ::osl::ResettableMutexGuard aLock(m_aLock);
    sal_Int32 nPos = m_nPos;
    ++m_nPos;
    return m_lItems[nPos];
}

//.........................................................................
}	// namespace comphelper
//.........................................................................