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# StackFrame.hpp

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    00001 /*
    00002  * Copyright (c) 2001, 2008,
    00003  *     DecisionSoft Limited. All rights reserved.
    00004  * Copyright (c) 2004, 2015 Oracle and/or its affiliates. All rights reserved.
    00005  *
    00006  *
    00007  * Licensed under the Apache License, Version 2.0 (the "License");
    00008  * you may not use this file except in compliance with the License.
    00009  * You may obtain a copy of the License at
    00010  *
    00011  *     http://www.apache.org/licenses/LICENSE-2.0
    00012  *
    00013  * Unless required by applicable law or agreed to in writing, software
    00014  * distributed under the License is distributed on an "AS IS" BASIS,
    00015  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    00016  * See the License for the specific language governing permissions and
    00017  * limitations under the License.
    00018  */
    00019
    00020 #ifndef _STACKFRAME_HPP
    00021 #define _STACKFRAME_HPP
    00022
    00023 #include <string>
    00024
    00025 #include <xqilla/framework/XQillaExport.hpp>
    00026 #include <xqilla/items/Item.hpp>
    00027
    00028 #include <xercesc/util/XercesDefs.hpp>
    00029
    00030 class ASTNode;
    00031 class TupleNode;
    00032 class LocationInfo;
    00033 class DynamicContext;
    00034 class EventHandler;
    00035 class Sequence;
    00036 class VariableStore;
    00037
    00038 XERCES_CPP_NAMESPACE_BEGIN
    00039 class DOMXPathNSResolver;
    00040 XERCES_CPP_NAMESPACE_END
    00041
    00045 class XQILLA_API StackFrame
    00046 {
    00047 public:
    00048   virtual ~StackFrame() {}
    00049
    00050   const LocationInfo *getLocationInfo() const { return location_; }
    00051   const StackFrame *getPreviousFrame() const { return prev_; }
    00052
    00053   virtual Sequence query(const XMLCh *query) const;
    00054   virtual void query(const XMLCh *query, EventHandler *events) const;
    00055
    00056   virtual const ASTNode *getASTNode() const = 0;
    00057   virtual const TupleNode *getTupleNode() const = 0;
    00058   virtual std::string getQueryPlan() const = 0;
    00059
    00060 protected:
    00061   StackFrame(const LocationInfo *location, DynamicContext *context);
    00062
    00063   const LocationInfo *location_;
    00064
    00065   DynamicContext *context_;
    00066   Item::Ptr contextItem_;
    00067   size_t contextPosition_;
    00068   size_t contextSize_;
    00069   const VariableStore *variables_;
    00070   const XERCES_CPP_NAMESPACE_QUALIFIER DOMXPathNSResolver *nsResolver_;
    00071   const XMLCh *defaultElementNS_;
    00072
    00073   const StackFrame *prev_;
    00074
    00075 private:
    00076   StackFrame(const StackFrame &);
    00077   StackFrame &operator=(const StackFrame&);
    00078 };
    00079
    00080 #endif