drepr.models.align

Classes

AlignedStep(source_idx, target_idx)
AlignmentType(value[, names, module, ...])
AutoAlignment([attrs])
Cardinality(value[, names, module, ...])
IdenticalAlign(source, target)
RangeAlignment(source, target, aligned_steps)
ValueAlignment(source, target)

class AlignedStep(source_idx: 'int', target_idx: 'int')

Bases: object

Parameters:

• source_idx (int) –

• target_idx (int) –

source_idx: int

target_idx: int

class RangeAlignment(source: 'AttrId', target: 'AttrId', aligned_steps: 'list[AlignedStep]')

Bases: object

Parameters:

• source (str) –

• target (str) –

• aligned_steps (list[drepr.models.align.AlignedStep]) –

source: str

target: str

aligned_steps: list[drepr.models.align.AlignedStep]

swap() → RangeAlignment

Return type:

RangeAlignment

compute_cardinality(desc: DRepr) → Cardinality

Compute the cardinality of an alignment

The cardinality between attribute x and attribute y are defined as follows:

1. one-to-one: one item of x can only link to one item of y and vice versa.

2. one-to-many: one item of x can link to multiple items of y, but one item of y can only link to one item of x.

3. many-to-one: the reversed case of one-to-many

4. many-to-many: multiple items of x can link to multiple items of y and vice versa.

The cardinality depends on the number of unfixed dimensions of each attribute, if an attribute has no unfixed steps, it will be one-to-, otherwise many-to-

Parameters:

desc (DRepr) –

Return type:

Cardinality

class ValueAlignment(source: 'AttrId', target: 'AttrId')

Bases: object

Parameters:

• source (str) –

• target (str) –

source: str

target: str

swap() → ValueAlignment

Return type:

ValueAlignment

compute_cardinality(desc: DRepr) → Cardinality

Compute the cardinality of an alignment

The cardinality between attribute x and attribute y are defined as follows:

1. one-to-one: one item of x can only link to one item of y and vice versa.

2. one-to-many: one item of x can link to multiple items of y, but one item of y can only link to one item of x.

3. many-to-one: the reversed case of one-to-many

4. many-to-many: multiple items of x can link to multiple items of y and vice versa.

The cardinality of the join will be one-to-* or *-to-one if values of source & target are unique.

Parameters:

desc (DRepr) –

Return type:

Cardinality

class IdenticalAlign(source: 'AttrId', target: 'AttrId')

Bases: object

Parameters:

• source (str) –

• target (str) –

source: str

target: str

compute_cardinality(desc: DRepr) → Cardinality

Parameters:

desc (DRepr) –

Return type:

Cardinality

swap() → IdenticalAlign

Return type:

IdenticalAlign

class AutoAlignment(attrs: 'Optional[list[str]]' = None)

Bases: object

Parameters:

attrs (Optional[list[str]]) –

attrs: Optional[list[str]] = None

compute_cardinality(desc: DRepr) → Cardinality

Parameters:

desc (DRepr) –

Return type:

Cardinality

class AlignmentType(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)

Bases: Enum

Range = 'range'

Value = 'value'

Ident = 'identical'

Auto = 'auto'

class Cardinality(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)

Bases: Enum

OneToOne = 'one-to-one'

OneToMany = 'one-to-many'

ManyToOne = 'many-to-one'

ManyToMany = 'many-to-many'

is_star_to_many() → bool

Return type:

bool

is_one_to_star() → bool

Return type:

bool

is_many_to_star() → bool

Return type:

bool