XalanObjectStackCache.hpp

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/*
 * 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
 *
 * 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 under the License.
 */
#if !defined(XALAN_OBJECTSTACKCACHE_HEADER_GUARD)
#define XALAN_OBJECTSTACKCACHE_HEADER_GUARD
 
 
 
#include <algorithm>
 
 
 
#include <xalanc/Include/XalanVector.hpp>
#include <xalanc/Include/STLHelper.hpp>
#include <xalanc/Include/XalanAutoPtr.hpp>
#include <xalanc/Include/XalanObjectCache.hpp>
 
 
 
namespace XALAN_CPP_NAMESPACE {
 
 
template<
class ObjectType,
#if defined(XALAN_NO_DEFAULT_TEMPLATE_ARGUMENTS)
class CreateFunctorType,
class DeleteFunctorType,
class ResetFunctorType>
#else
class CreateFunctorType = DefaultCacheCreateFunctor<ObjectType>,
class DeleteFunctorType = DeleteFunctor<ObjectType>,
class ResetFunctorType = DefaultCacheResetFunctor<ObjectType> >
#endif
class XalanObjectStackCache
{
public:
 
    typedef XalanVector<ObjectType*>            VectorType;
 
    typedef ObjectType  CacheObjectType;
 
    explicit
    XalanObjectStackCache(
            MemoryManager&  theManager, 
            XalanSize_t         initialListSize = 0) :
        m_createFunctor(),
        m_deleteFunctor(theManager),
        m_stack(theManager),
        m_numObjectsOnStack(0)
    {
        m_stack.reserve(initialListSize);
    }
 
    ~XalanObjectStackCache()
    {
        using std::for_each;
 
        for_each(
                m_stack.begin(),
                m_stack.end(),
                m_deleteFunctor);
    }
 
    ObjectType*
    get()
    {
        
        if (m_stack.size() == m_numObjectsOnStack)
        {
            ObjectType* const   theNewObject = m_createFunctor(m_stack.getMemoryManager());
            m_stack.push_back(theNewObject);
            ++m_numObjectsOnStack;
            return theNewObject;
        }
        else
        {
            return m_stack[m_numObjectsOnStack++];
        }
    }
 
    ObjectType*
    top()
    {
        assert (m_numObjectsOnStack > 0);
 
        return m_stack[m_numObjectsOnStack-1];
    }
 
    ObjectType*
    release()
    {
        assert(m_numObjectsOnStack > 0);
 
        return m_stack[--m_numObjectsOnStack];
    }
 
    void
    reset()
    {
        typename VectorType::iterator iterator;
 
        for (iterator = m_stack.begin(); iterator < m_stack.end(); iterator++)
        {
            m_resetFunctor(*iterator);
        }
    }
 
    // Functors for various operations...
    CreateFunctorType   m_createFunctor;
 
    DeleteFunctorType   m_deleteFunctor;
 
    ResetFunctorType    m_resetFunctor;
 
private:
 
    // There are not defined...
    XalanObjectStackCache(const XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&   theRHS);
 
    XalanObjectStackCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&
    operator=(const XalanObjectCache<ObjectType, CreateFunctorType, DeleteFunctorType, ResetFunctorType>&   theRHS);
 
 
    // Data members...
    VectorType          m_stack;
 
    typename VectorType::size_type m_numObjectsOnStack;
 
};
 
 
 
 
template<class ObjectType>
class XalanObjectStackCacheDefault : public XalanObjectStackCache<ObjectType, DefaultCacheCreateFunctor<ObjectType>, DeleteFunctor<ObjectType>, DefaultCacheResetFunctor<ObjectType> >
{
public:
 
    typedef XalanObjectStackCache<ObjectType, DefaultCacheCreateFunctor<ObjectType>, DeleteFunctor<ObjectType>, DefaultCacheResetFunctor<ObjectType> >      BaseClassType;
 
    explicit
    XalanObjectStackCacheDefault(XalanSize_t    initialListSize = 0) :
        BaseClassType(initialListSize)
    {
    }
};
 
 
 
}
 
 
 
#endif