KeysInMatrix Class Reference

Pattern made by a value::Matrix where all elements either in the first row or in the first column are keys. More...

#include <keyvalue/pattern/KeysInMatrix.h>

Inheritance diagram for KeysInMatrix:

List of all members.

Public Member Functions
bool	parse (frontend::Queue &queue)
	Parses the beginning of a frontend::Queue.
std::pair< string, value::Value >	pop ()
	Gets and removes the next stored key-value pair.
bool	isEmpty () const
	Checks if the list of recognized key-value pairs is empty.
Private Member Functions
bool	check (const value::Matrix &matrix, bool transpose=false)
	This method does all the job explained in the class description.
Private Attributes
size_t	next_
vector< std::pair< string, value::Value > >	data_

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Detailed Description

Pattern made by a value::Matrix where all elements either in the first row or in the first column are keys.

More precisely, it is checked if the value::Matrix, M=M(i, j), has the following properties:

• M has at least two rows;
• M(0, j) is a key for all j;
• M(1, 0) is not a key.

If M pass this check, then for each column of M, its first entry will be a key corresponding to the value given by the value::Vector (or value::Single, when M has only two rows) made by the other entries in this column. If M does not pass the check above, then the same test and key-value pattern parsing is performed on its transpose.

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Member Function Documentation

bool parse

(

frontend::Queue &

queue

)

[virtual]

Parses the beginning of a frontend::Queue.

When a pattern is recognized, the value::Value objects which make it are removed from frontend::Queue and all corresponding key-value pairs are stored inside the this class for later queries.

Parameters:

queue

: frontend::Queue to be parsed.

Returns:

If the pattern is recognized, then this method returns true. Otherwise, it returns false.

Implements Pattern.

std::pair<string, value::Value> pop

(

)

[virtual]

Gets and removes the next stored key-value pair.

The debug version checks if there is any key-value pair be popped (by calling isEmpty()) and throw an exception when the check fails. Release version has undefined behavior when the list is empty.

Returns:

The key-value pair.

Exceptions:

LogicError

: (Debug build only) When the list is empty.

Implements Pattern.

bool isEmpty

(

)

const [virtual]

Checks if the list of recognized key-value pairs is empty.

Returns:

If the list is empty, this method returns true. Otherwise, it returns false.

Implements Pattern.

bool check	(	const value::Matrix &	matrix,
		bool	transpose = false
	)			[private]

This method does all the job explained in the class description.

Parameters:

	matrix	: Input matrix;
	transpose	: If true, the the test is performed on matrix transpose.

Returns:

This method returns true if the pattern is recognized. Otherwise it returns false.