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ResultImpl.hpp
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1/*
2 * Copyright (c) 2001, 2008,
3 * DecisionSoft Limited. All rights reserved.
4 * Copyright (c) 2004, 2015 Oracle and/or its affiliates. All rights reserved.
5 *
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20#ifndef _RESULTIMPL_HPP
21#define _RESULTIMPL_HPP
22
23#include <xqilla/framework/XQillaExport.hpp>
24#include <xqilla/items/Item.hpp>
26
27class DynamicContext;
28class Sequence;
29class Result;
30class ResultBuffer;
31
33class XQILLA_API ResultImpl : public LocationInfo
34{
35public:
36 virtual ~ResultImpl() {}
37
38 Result *getResultPointer() { return resultPointer_; }
39 void setResultPointer(Result *p) { resultPointer_ = p; }
40
42 virtual Item::Ptr next(DynamicContext *context);
43
45 virtual Item::Ptr nextOrTail(Result &tail, DynamicContext *context);
46
49
51 virtual void toResultBuffer(unsigned int readCount, ResultBuffer &buffer);
52
54 virtual void skip(unsigned count, DynamicContext *context);
55
56protected:
58
60
61private:
62 ResultImpl(const ResultImpl &) {};
63 ResultImpl &operator=(const ResultImpl &) { return *this; };
64};
65
66#endif
The execution time dynamic context interface.
Definition DynamicContext.hpp:39
A class that gives records a location in the query.
Definition LocationInfo.hpp:30
A lazily evaluated query result.
Definition ResultImpl.hpp:34
Result * getResultPointer()
Definition ResultImpl.hpp:38
virtual void skip(unsigned count, DynamicContext *context)
Skip ahead.
virtual Item::Ptr next(DynamicContext *context)
Get the next item from the iterator. Returns null if the is no next value.
void setResultPointer(Result *p)
Definition ResultImpl.hpp:39
virtual Item::Ptr nextOrTail(Result &tail, DynamicContext *context)
Gets the next item, or returns a tail call Result which will give the next item.
virtual ~ResultImpl()
Definition ResultImpl.hpp:36
virtual void toResultBuffer(unsigned int readCount, ResultBuffer &buffer)
Returns a result buffer of the result.
ResultImpl(const LocationInfo *o)
virtual Sequence toSequence(DynamicContext *context)
Cast operator to a Sequence.
Result * resultPointer_
Definition ResultImpl.hpp:59
A scoped pointer wrapper for the lazily evaluated query result.
Definition Result.hpp:38
An eagerly evaluated result of a query execution.
Definition Sequence.hpp:40