Android Open Source - Grocery-List Grocery Content Provider

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Back to project page Grocery-List.

License

The source code is released under:

MIT License

Java Source Code

package com.evanwaldron.grocerylist.storage;
/*  ww  w.  j  av  a  2  s .  c o m*/
import android.content.ContentProvider;
import android.content.ContentProviderOperation;
import android.content.ContentProviderResult;
import android.content.ContentValues;
import android.content.OperationApplicationException;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.util.Log;

import java.util.ArrayList;

/**
 * Created by Evan on 9/28/14 12:08 PM.
 */
public class GroceryContentProvider extends ContentProvider {

    private static final String LOG_TAG = GroceryContentProvider.class.getSimpleName();

    static final String AUTH = "com.evanwaldron.grocerylist.content";

    private static final int GROCERIES = 1;

    private static final UriMatcher uriMatcher;

    static{
        uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
        uriMatcher.addURI(AUTH, Storage.Groceries.CONTENT_URI.getLastPathSegment(), GROCERIES);
    }

    private DBHelper dbHelper;

    @Override
    public boolean onCreate() {
        dbHelper = new DBHelper(getContext());
        return true;
    }

    @Override
    public ContentProviderResult[] applyBatch(ArrayList<ContentProviderOperation> operations){
        if(operations.size() == 0){ return null; }

        SQLiteDatabase db = dbHelper.getWritableDatabase();

        ContentProviderResult[] results = new ContentProviderResult[operations.size()];

        db.beginTransaction();
        try {
            for (int i = 0; i < operations.size(); i++) {
                ContentProviderOperation operation = operations.get(i);
                results[i] = operation.apply(this, results, i);
            }
        }catch(OperationApplicationException e){
            Log.e(LOG_TAG, "Error performing db operation " + e.getMessage());
            return null;
        }finally {
            db.setTransactionSuccessful();
        }

        return results;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        SQLiteDatabase db = dbHelper.getReadableDatabase();

        String tableName = null;

        switch(uriMatcher.match(uri)){
            case GROCERIES:
                tableName = Storage.Groceries.TABLE_NAME;
                break;
            default:
                Log.e(LOG_TAG, "Uri not recognized: " + uri.toString());
                return null;
        }

        Cursor result = db.query(tableName, projection, selection, selectionArgs, null, null, null, null);
        if(result == null){
            Log.e(LOG_TAG, "Failed to query uri " + uri.toString() + ", table " + tableName);
            return null;
        }

        result.setNotificationUri(getContext().getContentResolver(), uri);

        return result;
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        SQLiteDatabase db = dbHelper.getWritableDatabase();

        String tableName = null;

        switch(uriMatcher.match(uri)){
            case GROCERIES:
                tableName = Storage.Groceries.TABLE_NAME;
                break;
            default:
                Log.e(LOG_TAG, "Uri not recognized: " + uri.toString());
                return null;
        }

        long id = db.insert(tableName, null, values);

        if(id < 0){
            Log.i(LOG_TAG, "An error occurred inserting into table " + tableName);
            return null;
        }

        getContext().getContentResolver().notifyChange(uri, null);

        return Uri.withAppendedPath(uri, Long.toString(id));
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        String tableName;

        switch(uriMatcher.match(uri)){
            case GROCERIES:
                tableName = Storage.Groceries.TABLE_NAME;
                break;
            default:
                Log.e(LOG_TAG, "Uri not recognized: " + uri.toString());
                return 0;
        }

        SQLiteDatabase db = dbHelper.getWritableDatabase();

        int result = db.delete(tableName, selection, selectionArgs);
        if(result == 0){
            Log.d(LOG_TAG, "No items were deleted during delete call");
            return result;
        }

        getContext().getContentResolver().notifyChange(uri, null);

        return result;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        String tableName;

        switch(uriMatcher.match(uri)){
            case GROCERIES:
                tableName = Storage.Groceries.TABLE_NAME;
                break;
            default:
                Log.e(LOG_TAG, "Uri not recognized: " + uri.toString());
                return 0;
        }

        SQLiteDatabase db = dbHelper.getWritableDatabase();

        int result = db.update(tableName, values, selection, selectionArgs);
        if(result == 0){
            Log.d(LOG_TAG, "No items were updated during update call");
            return result;
        }

        getContext().getContentResolver().notifyChange(uri, null);

        return result;
    }
}

Java Source Code List

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