101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/*
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* Copyright (c) 2001-2007
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* DecisionSoft Limited. All rights reserved.
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* Copyright (c) 2004-2007
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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: ASTNodeImpl.hpp,v 1.14 2007/11/28 13:13:19 jpcs Exp $
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*/
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#ifndef _ASTNODEIMPL_HPP
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#define _ASTNODEIMPL_HPP
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class DynamicContext;
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class Numeric;
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#include <xqilla/ast/ASTNode.hpp>
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#include <xqilla/runtime/Result.hpp>
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#include <xqilla/runtime/LazySequenceResult.hpp>
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#include <xqilla/ast/StaticAnalysis.hpp>
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/** class which is used as base for all the different data types */
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class XQILLA_API ASTNodeImpl : public ASTNode
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{
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public:
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ASTNodeImpl(XPath2MemoryManager* memMgr);
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virtual ~ASTNodeImpl();
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ASTNode::whichType getType(void) const;
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/** Returns true if this ASTNode is an instance of XQSequence or XQLiteral */
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virtual bool isConstant() const;
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/** Returns true if this ASTNode has no predicates, and is an instance of
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XQSequence or XQLiteral. If the literal value of this ASTNode
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is a single DateOrTimeType, then !hasTimezone() on it must return true,
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otherwise this method will return false. */
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virtual bool isDateOrTimeAndHasNoTimezone(StaticContext* context) const;
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virtual bool isSingleNumericConstant(StaticContext *context) const;
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/// Default - returns an empty update list
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virtual PendingUpdateList createUpdateList(DynamicContext *context) const;
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/**
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* Can be overridden by derived classes. Default implementation returns a
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* SequenceResult made from the Sequence returned by createSequence.
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*/
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virtual Result createResult(DynamicContext* context, int flags=0) const;
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/**
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* Collapse the compiled expression based on context. Default implementation
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* returns an empty sequence.
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*/
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virtual Sequence createSequence(DynamicContext* context, int flags=0) const;
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/** Returns the result of this expression via the EventHandler provided.
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Default implementation uses result returned from createResult(). */
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virtual void generateEvents(EventHandler *events, DynamicContext *context,
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bool preserveNS, bool preserveType) const;
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/** Performs constant folding on this ASTNode. */
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ASTNode *constantFold(StaticContext *context);
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virtual const StaticAnalysis &getStaticAnalysis() const;
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protected:
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void setType(ASTNode::whichType t);
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XPath2MemoryManager* getMemoryManager(void) const;
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class CreateSequenceResult : public LazySequenceResult
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{
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public:
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CreateSequenceResult(const ASTNodeImpl *di, int flags, DynamicContext *context);
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void getResult(Sequence &toFill, DynamicContext *context) const;
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std::string asString(DynamicContext *context, int indent) const;
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private:
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int _flags;
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const ASTNodeImpl *_di;
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};
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StaticAnalysis _src;
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private:
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whichType _type;
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XPath2MemoryManager* _memMgr;
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};
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#endif
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