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LcgInfo::SQLtoSQLPredicateTree Class Reference

This class implements a binary tree of nodes that stores a SQL "WHERE predicate", that can translate it to a new schema, and that can evaluate it, outputing a SQL string. More...

#include <SQLtoSQLPredicateTree.h>

Inheritance diagram for LcgInfo::SQLtoSQLPredicateTree:

List of all members.

Public Methods
	SQLtoSQLPredicateTree ()
	Constructor of the class. More...
virtual	~SQLtoSQLPredicateTree ()
	Destructor of the class.
SQLtoSQLPredicateTree *	create ()
	Creates a new node of the type of this node (SQLtoSQLPredicateTree). More...
virtual SQLtoSQLPredicateTree *	clone ()
	Recursively copies this node and all the nodes below it. More...
virtual std::string	evaluate (std::vector< std::string > &pQueries)
	Returns the predicate (and possibly list of necessary subqueries) resulting of evaluating this node and all its descendants. More...

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Detailed Description

This class implements a binary tree of nodes that stores a SQL "WHERE predicate", that can translate it to a new schema, and that can evaluate it, outputing a SQL string.

Each object is a node linked to its two children nodes (left and right). This class extends the SQLPredicateTree, and overloads the evaluate() method, so that the evaluation is expressed using SQL.

Author:

LCG's EIS Group. CERN.

Version:

1.0

Date:

2004.

Definition at line 22 of file SQLtoSQLPredicateTree.h.

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Constructor & Destructor Documentation

SQLtoSQLPredicateTree::SQLtoSQLPredicateTree (    )

Constructor of the class. It just creates an empty object. Definition at line 16 of file SQLtoSQLPredicateTree.cpp. Referenced by clone, and create.

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Member Function Documentation

SQLtoSQLPredicateTree * SQLtoSQLPredicateTree::clone (    )  [virtual]

Recursively copies this node and all the nodes below it. The resulting object's dynamic type will be that of this class. It is a trick (similar to a virtual copy constructor) used to allow the recursive copy of the tree. See also: create Returns: a pointer to a new Predicate node with the same values as this node Implements LcgInfo::SQLPredicateTree. Definition at line 28 of file SQLtoSQLPredicateTree.cpp. References create, LcgInfo::PredicateTree::depth, LcgInfo::PredicateTree::left, LcgInfo::PredicateTree::right, SQLtoSQLPredicateTree, LcgInfo::PredicateTree::type, and LcgInfo::PredicateTree::value.

SQLtoSQLPredicateTree * SQLtoSQLPredicateTree::create (    )  [virtual]

Creates a new node of the type of this node (SQLtoSQLPredicateTree). It uses some default values (in order to use a template, use the PredicateTree::clone() method). It is a trick (virtual constructor) used to allow the recursive creation of the tree when inserting predicates. It overloads a method of the SQLPredicaTree class. Returns: a pointer to a new SQLtoSQLPredicate node with default values Implements LcgInfo::SQLPredicateTree. Definition at line 24 of file SQLtoSQLPredicateTree.cpp. References SQLtoSQLPredicateTree. Referenced by clone.

string SQLtoSQLPredicateTree::evaluate (  std::vector< std::string > &    pQueries )  [virtual]

Returns the predicate (and possibly list of necessary subqueries) resulting of evaluating this node and all its descendants. It just composes a global predicate ordering the predicates in an infix expression (SQL like). It may throw a QueryTranslationException if the node (or one of its children) cannot be parsed properly. Parameters: pQueries  to store the list of necessary subqueries (if any) Returns: resulting predicate Implements LcgInfo::SQLPredicateTree. Definition at line 49 of file SQLtoSQLPredicateTree.cpp. References LcgInfo::PredicateTree::depth, LcgInfo::int2str, LcgInfo::PredicateTree::left, LcgInfo::nocaseCompare, LcgInfo::PredicateTree::right, LcgInfo::PredicateTree::type, and LcgInfo::PredicateTree::value.

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The documentation for this class was generated from the following files:

• SQLtoSQLPredicateTree.h
• SQLtoSQLPredicateTree.cpp

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