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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/searchlib/query/weight.h>
#include <vespa/searchlib/util/rawbuf.h>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/searchlib/parsequery/parse.h>
namespace search {
/**
* An item on the simple query stack.
*
* An object of this class represents a single item
* on the simple query stack. It has a type, which corresponds
* to the different query stack execution operations. It also
* provides an arity, and the string values indexName and term, to
* accomodate the different needs of the operations.
*/
class SimpleQueryStackItem : public ParseItem
{
private:
SimpleQueryStackItem(const SimpleQueryStackItem &) = delete;
SimpleQueryStackItem& operator=(const SimpleQueryStackItem &) = delete;
SimpleQueryStackItem();
public:
/** Pointer to next item in a linked list. */
SimpleQueryStackItem *_next;
private:
uint32_t _arg1;
double _arg2;
double _arg3;
ItemType _type;
public:
ItemType Type() const { return _type; }
/** The number of operands for the operation. */
uint32_t _arity;
/** The name of the specified index, or empty if no index. */
vespalib::string _indexName;
/** The specified search term. */
vespalib::string _term;
/**
* Overloaded constructor for SimpleQueryStackItem. Used primarily for
* the operators, or phrase without indexName.
*
* @param type The type of the SimpleQueryStackItem.
* @param arity The arity of the operation indicated by the SimpleQueryStackItem.
*/
SimpleQueryStackItem(ItemType type, int arity);
/**
* Overloaded constructor for SimpleQueryStackItem. Used for PHRASEs.
*
* @param type The type of the SimpleQueryStackItem.
* @param arity The arity of the operation indicated by the SimpleQueryStackItem.
* @param idx The name of the index of the SimpleQueryStackItem.
*/
SimpleQueryStackItem(ItemType type, int arity, const char *index);
/**
* Overloaded constructor for SimpleQueryStackItem. Used for TERMs without index.
*
* @param type The type of the SimpleQueryStackItem.
* @param term The actual term string of the SimpleQueryStackItem.
*/
SimpleQueryStackItem(ItemType type, const char *term);
/**
* Destructor for SimpleQueryStackItem.
*/
~SimpleQueryStackItem();
/**
* Set the value of the _term field.
* @param term The string to set the _term field to.
*/
void SetTerm(const char *term) { _term = term; }
/**
* Set the value of the _indexName field.
* @param idx The string to set the _indexName field to.
*/
void SetIndex(const char *index) { _indexName = index; }
/**
* Set the type of the operator. Use this with caution,
* as this changes the semantics of the item.
*
* @param type The new type.
*/
void SetType(ItemType type) {
_type = type;
}
/**
* Encode the item in a binary buffer.
* @param buf Pointer to a buffer containing the encoded contents.
*/
void AppendBuffer(RawBuf *buf) const;
};
}
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