77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
|
|
* Copyright (c) 2001-2007
|
|
* DecisionSoft Limited. All rights reserved.
|
|
* Copyright (c) 2004-2007
|
|
* Oracle. All rights reserved.
|
|
*
|
|
* Licensed 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.
|
|
*
|
|
* $Id: ResultImpl.hpp,v 1.10 2007/11/28 13:13:25 jpcs Exp $
|
|
*/
|
|
|
|
#ifndef _RESULTIMPL_HPP
|
|
#define _RESULTIMPL_HPP
|
|
|
|
#include <string>
|
|
#include <xercesc/util/XercesDefs.hpp>
|
|
|
|
#include <xqilla/framework/XQillaExport.hpp>
|
|
#include <xqilla/items/Item.hpp>
|
|
#include <xqilla/framework/ReferenceCounted.hpp>
|
|
#include <xqilla/ast/LocationInfo.hpp>
|
|
|
|
class SequenceType;
|
|
class DynamicContext;
|
|
class Sequence;
|
|
|
|
/** A lazily evaluated query result */
|
|
class XQILLA_API ResultImpl : public ReferenceCounted, public LocationInfo
|
|
{
|
|
public:
|
|
virtual ~ResultImpl() {}
|
|
|
|
/// Get the next item from the iterator. Returns null if the is no next value.
|
|
virtual Item::Ptr next(DynamicContext *context) = 0;
|
|
|
|
/// Performs iterator specific skip of results
|
|
virtual void skip() {}
|
|
|
|
/// Returns the effective boolean value of the sequence. Only works properly before next() has been called.
|
|
virtual bool getEffectiveBooleanValue(DynamicContext* context, const LocationInfo *info);
|
|
/// Returns the effective boolean value of the sequence.
|
|
static bool getEffectiveBooleanValue(const Item::Ptr &first, const Item::Ptr &second, DynamicContext* context, const LocationInfo *info);
|
|
|
|
/// Cast operator to a Sequence. Only works properly before next() has been called.
|
|
virtual Sequence toSequence(DynamicContext *context);
|
|
|
|
/// Debug method to visualise the Result
|
|
virtual std::string asString(DynamicContext *context, int indent) const = 0;
|
|
|
|
static std::string getIndent(int indent);
|
|
|
|
protected:
|
|
/**
|
|
* Do not allocate this object from a memory manager!
|
|
* It must be created using the heap.
|
|
*/
|
|
ResultImpl(const LocationInfo *o)
|
|
{
|
|
setLocationInfo(o);
|
|
}
|
|
|
|
private:
|
|
ResultImpl(const ResultImpl &) {};
|
|
ResultImpl &operator=(const ResultImpl &) { return *this; };
|
|
};
|
|
|
|
#endif
|