109 lines
2.4 KiB
C++
109 lines
2.4 KiB
C++
/*
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* Copyright (c) 2001-2008
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* DecisionSoft Limited. All rights reserved.
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* Copyright (c) 2004-2008
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* Oracle. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Id: Result.hpp,v 1.13 2008/01/08 18:47:33 jpcs Exp $
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*/
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#ifndef _RESULT_HPP
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#define _RESULT_HPP
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#include <string>
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#include <xercesc/util/XercesDefs.hpp>
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#include <xqilla/framework/XQillaExport.hpp>
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#include <xqilla/items/Item.hpp>
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#include <xqilla/runtime/ResultImpl.hpp>
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#include <xqilla/runtime/EmptyResult.hpp>
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class Sequence;
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class SequenceType;
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class DynamicContext;
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class StaticType;
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/** A reference counting wrapper for the lazily evaluated query result */
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class XQILLA_API Result
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{
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public:
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Result(const Item::Ptr &item);
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Result(const Sequence &seq);
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Result(ResultImpl *impl);
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Result(const Result &o);
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Result &operator=(const Result &o);
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~Result();
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/// Returns the underlying ResultImpl object
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ResultImpl *operator->();
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/// Returns the underlying ResultImpl object
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const ResultImpl *operator->() const;
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/// Returns the underlying ResultImpl object
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ResultImpl *get();
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/// Returns the underlying ResultImpl object
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const ResultImpl *get() const;
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/// Returns true if the underlying pointer is null
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bool isNull() const;
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EmptyResult* getEmpty() const;
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private:
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ResultImpl *_impl;
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static EmptyResult _empty;
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};
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inline bool Result::isNull() const
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{
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return _impl == 0;
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}
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inline ResultImpl *Result::get()
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{
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if(_impl) return _impl;
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return getEmpty();
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}
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inline const ResultImpl *Result::get() const
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{
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if(_impl) return _impl;
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return getEmpty();
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}
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inline ResultImpl *Result::operator->()
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{
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return get();
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}
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inline const ResultImpl *Result::operator->() const
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{
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return get();
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}
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inline Result &Result::operator=(const Result &o)
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{
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if(o._impl != _impl) {
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if(_impl) _impl->decrementRefCount();
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_impl = o._impl;
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if(_impl) _impl->incrementRefCount();
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}
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return *this;
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}
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#endif
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