| GNOME Data Access 4.0 manual | ||||
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GdaDataComparator;
GdaDataComparatorClass;
GdaDataComparatorPrivate;
GObject* gda_data_comparator_new (GdaDataModel *old_model,
GdaDataModel *new_model);
void gda_data_comparator_set_key_columns (GdaDataComparator *comp,
const gint *col_numbers,
gint nb_cols);
GdaDiff;
enum GdaDiffType;
gboolean gda_data_comparator_compute_diff (GdaDataComparator *comp,
GError **error);
gint gda_data_comparator_get_n_diffs (GdaDataComparator *comp);
const GdaDiff* gda_data_comparator_get_diff (GdaDataComparator *comp,
gint pos);
The GdaDataComparator is a simple object which takes two GdaDataModel objects and compare them.
Actual comparison is performed when the gda_data_comparator_compute_diff() is called; for each
difference found, the diff-computed signal
is emitted (any user installed signal handler which returns FALSE stops the computing process).
After the differences have been computed, they can each be accessed using gda_data_comparator_get_diff(),
the number of differences found being returned by gda_data_comparator_get_n_diffs().
There are some limitations to this object:
The data models compared must have the same number and type of columns
The comparison is done column-for-column: one cannot omit columns in the comparison, nor compare columns with different positions
typedef struct {
GObject object;
GdaDataComparatorPrivate *priv;
} GdaDataComparator;
typedef struct {
GObjectClass parent_class;
gboolean (* diff_computed) (GdaDataComparator *comp, GdaDiff *diff);
} GdaDataComparatorClass;
GObject* gda_data_comparator_new (GdaDataModel *old_model, GdaDataModel *new_model);
Creates a new comparator to compute the differences from old_model to new_model: if one applies
all the computed differences (as GdaDiff structures) to old_model, the resulting data model
should have the same contents as new_model.
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Data model to which the modifications should be applied |
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Target data model. |
Returns : |
a new GdaDataComparator object |
void gda_data_comparator_set_key_columns (GdaDataComparator *comp, const gint *col_numbers, gint nb_cols);
Defines the columns which will be used as a key when searching data. This is not mandatory but will speed things up as less data will be processed.
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a GdaDataComparator object |
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a array of nb_cols values
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the size of the col_numbers array
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typedef struct {
GdaDiffType type;
gint old_row;
gint new_row;
GHashTable *values; /* key = ('+' or '-') and a column position starting at 0 (string)
* value = a GValue pointer */
} GdaDiff;
typedef enum {
GDA_DIFF_ADD_ROW,
GDA_DIFF_REMOVE_ROW,
GDA_DIFF_MODIFY_ROW
} GdaDiffType;
gboolean gda_data_comparator_compute_diff (GdaDataComparator *comp, GError **error);
Actually computes the differences bewteen the data models for which comp is defined.
For each difference computed, stored in a GdaDiff structure, the "diff-computed" signal is emitted. If one connects to this signal and returns FALSE in the signal handler, then computing differences will be stopped and an error will be returned.
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a GdaDataComparator object |
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a place to store errors, or NULL
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Returns : |
TRUE if all the differences have been sucessfully computed, and FALSE if an error occurred |
gint gda_data_comparator_get_n_diffs (GdaDataComparator *comp);
Get the number of differences as computed by the last time gda_data_comparator_compute_diff() was called.
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a GdaDataComparator object |
Returns : |
the number of computed differences |
const GdaDiff* gda_data_comparator_get_diff (GdaDataComparator *comp, gint pos);
Get a pointer to the GdaDiff structure representing the difference which number is pos
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a GdaDataComparator object |
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the requested difference number (starting at 0) |
Returns : |
a pointer to a GdaDiff, or NULL if pos is invalid
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