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provider.py
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207 lines (173 loc) · 6.5 KB
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"""Generates the ContentProvider that matches the other files
>>> from db_table import Table, Column, ForeignKey, Unique
>>> from dbitem import DBItem
>>> pkg = "com.example.appname.database"
>>> t = Table('Album').add_cols(Column('albumname').text.not_null.default("''"), \
Column('artistname').text.not_null)\
.add_constraints(ForeignKey('artistname').references('artist', 'name')\
.on_delete_cascade,\
Unique('albumname').on_conflict_replace)
>>> p = Provider("MyProvider", pkg)
>>> p.add_dbitems(DBItem(t, pkg))
"""
from dbitem import DBItem
from database_handler import DatabaseHandler
class Provider(object):
def __init__(self, classname, pkg):
"""Must specify pkg and classname"""
self.pkg = pkg
self.classname = classname
self.dbitems = []
def add_dbitems(self, *items):
self.dbitems.extend(items)
@property
def match_uris(self):
result = "\n "\
.join([MATCH_URI_TEMPLATE\
.format(classname=item.classname) for item in self.dbitems])
return result
@property
def match_types(self):
#result = ""
#for item in self.dbitems:
result = "".join([MATCH_TYPE_TEMPLATE\
.format(classname=item.classname) for item in self.dbitems])
return result
@property
def match_query(self):
return "".join([MATCH_QUERY_TEMPLATE.format(classname=item.classname)\
for item in self.dbitems])
@property
def delete_cases(self):
return "".join([DELETE_CASE_TEMPLATE.format(classname=item.classname)\
for item in self.dbitems])
def __repr__(self):
return PROVIDER_TEMPLATE.format(provider=self)
@property
def manifest_entry(self):
return MANIFEST_TEMPLATE.format(self)
# When formatting this, just give a provider to format
MANIFEST_TEMPLATE = """<provider
android:name="{0.pkg}.{0.classname}"
android:authorities="{0.pkg}.AUTHORITY"
android:enabled="true"
android:exported="false" />
"""
MATCH_URI_TEMPLATE = "{classname}.addMatcherUris(sURIMatcher);"
MATCH_TYPE_TEMPLATE = """
case {classname}.BASEITEMCODE:
return {classname}.TYPE_ITEM;
case {classname}.BASEURICODE:
return {classname}.TYPE_DIR;"""
MATCH_QUERY_TEMPLATE = """
case {classname}.BASEITEMCODE:
id = Long.parseLong(uri.getLastPathSegment());
result = handler.get{classname}Cursor(id);
result.setNotificationUri(getContext().getContentResolver(), uri);
break;
case {classname}.BASEURICODE:
result = handler.getAll{classname}sCursor(selection, args, sortOrder);
result.setNotificationUri(getContext().getContentResolver(), uri);
break;
"""
DELETE_CASE_TEMPLATE = """
case {classname}.BASEITEMCODE:
table = {classname}.TABLE_NAME;
if (selection != null && !selection.isEmpty()) {{
sb.append(" AND ");
}}
sb.append({classname}.COL_ID + " IS ?");
args.add(uri.getLastPathSegment());
// Alternative is this
// values.put({classname}.COL_DELETED, 1);
break;
"""
PROVIDER_TEMPLATE = """
package {provider.pkg};
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.net.Uri;
public class {provider.classname} extends ContentProvider {{
public static final String AUTHORITY = "{provider.pkg}.AUTHORITY";
public static final String SCHEME = "content://";
private static final UriMatcher sURIMatcher = new UriMatcher(
UriMatcher.NO_MATCH);
static {{
{provider.match_uris}
}}
@Override
public boolean onCreate() {{
return true;
}}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {{
// Setup some common parsing and stuff
final String table;
final ContentValues values = new ContentValues();
final ArrayList<String> args = new ArrayList<String>();
if (selectionArgs != null) {{
for (String arg : selectionArgs) {{
args.add(arg);
}}
}}
final StringBuilder sb = new StringBuilder();
if (selection != null && !selection.isEmpty()) {{
sb.append("(").append(selection).append(")");
}}
// Configure table and args depending on uri
switch (sURIMatcher.match(uri)) {{
{provider.delete_cases}
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}}
// Write to DB
final SQLiteDatabase db = DatabaseHandler.getInstance(getContext())
.getWritableDatabase();
final String[] argArray = new String[args.size()];
final int result = db.delete(table, sb.toString(),
args.toArray(argArray));
// Or alternatively
//final int result = db.update(table, values, sb.toString(),
// args.toArray(argArray));
if (result > 0) {{
// Support upload sync
getContext().getContentResolver().notifyChange(uri, null, true);
}}
return result;
}}
@Override
public Uri insert(Uri uri, ContentValues values) {{
// TODO: Implement this to handle requests to insert a new row.
throw new UnsupportedOperationException("Not yet implemented");
}}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {{
// TODO: Implement this to handle requests to update one or more rows.
throw new UnsupportedOperationException("Not yet implemented");
}}
@Override
public String getType(Uri uri) {{
switch (sURIMatcher.match(uri)) {{
{provider.match_types}
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}}
}}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] args, String sortOrder) {{
Cursor result = null;
final long id;
final DatabaseHandler handler = DatabaseHandler.getInstance(getContext());
switch (sURIMatcher.match(uri)) {{
{provider.match_query}
default:
throw new IllegalArgumentException("Unknown URI " + uri);
}}
return result;
}}
}}
"""