## registry

registry — Class to store a mapping of qualified names (QName) to other qualified names.

## Functions

const char * | (*LassoRegistryTranslationFunction) ()
lasso_error_t | lasso_registry_default_add_direct_mapping ()
lasso_error_t | lasso_registry_default_add_functional_mapping ()
const char * | lasso_registry_default_get_mapping ()

## Description

A qualified name is a name or a string in the context of another name, or namespace. This object implement a function of a tuple (namespace, name, namespace) to a name. For the moment there is no need to enumerate all tuples (namespace, name) pair given a base pair, i.e. a function from tuple (namespace, name) to a list of tuples (namespace,name).

We support two kinds of mapping:

- you can give a direct mapping between two QName,

- or you can give a function that will manage mapping between one namespace and another one.

For internal use inside lasso we define the following namespaces:

- LASSO_LASSO_HREF and,

- LASSO_PYTHON_HREF.

For functional mappings the mapping function must return constant strings created using `g_intern_string()` or using `g_type_name()`.

## Functions

### LassoRegistryTranslationFunction ()

    const char *
    (*LassoRegistryTranslationFunction) (const char *from_namespace,
                                         const char *from_name,
                                         const char *to_namespace);

### lasso_registry_default_add_direct_mapping ()

    lasso_error_t
    lasso_registry_default_add_direct_mapping
                                   (const char *from_namespace,
                                    const char *from_name,
                                    const char *to_namespace,
                                    const char *to_name);

Add a new mapping from a QName to a QName.

#### Parameters

from_namespace | the namespace of the mapped QName |
from_name | the name of the mapped QName |
to_namespace | the namepsace of the mapped to QName |
to_name | the name of the mapped to QName |

#### Returns

0 if successfull, LASSO_REGISTRY_ERROR_KEY_EXISTS if this mapping is already registered, LASSO_PARAM_ERROR_INVALID_VALUE if one the argument is invalid.

### lasso_registry_default_add_functional_mapping ()

    lasso_error_t
    lasso_registry_default_add_functional_mapping
                                   (const char *from_namespace,
                                    const char *to_namespace,
                                    LassoRegistryTranslationFunction translation_function);

`from_namespace` : URI of the source namespace `to_namespace` : URI of the destination namespace `translation_function` : a function mapping string to string from the first namespace to the second one

Register a new mapping from from_namesapce to to_namespace using the translation_function into the default mapping. This functions is not forced to return a value for any string, it can return NULL.

#### Returns

0 if successfull, LASSO_REGISTRY_ERROR_KEY_EXISTS if this mapping is already registered, LASSO_PARAM_ERROR_INVALID_VALUE if one the argument is invalid.

### lasso_registry_default_get_mapping ()

    const char *
    lasso_registry_default_get_mapping (const char *from_namespace,
                                        const char *from_name,
                                        const char *to_namespace);

Retrieve the name of the QName in the namespace to_namespace that maps the QName from_namespace:from_name.

#### Parameters

from_namespace | the namespace of the mapped QName |
from_name | the name of the mapped QName |
to_namespace | the namepsace of the mapped to QName |

#### Returns

the name string of the QName or NULL if no mapping exists.