DelegatingProvider.java

// Copyright 2015 The Project Buendia Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License.  You may obtain a copy
// of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distrib-
// uted under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES
// OR CONDITIONS OF ANY KIND, either express or implied.  See the License for
// specific language governing permissions and limitations under the License.

package org.projectbuendia.client.providers;

import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;

import net.sqlcipher.database.SQLiteOpenHelper;

/** A {@link ContentProvider} that delegates responsibility to {@link ProviderDelegate}s. */
abstract class DelegatingProvider<T extends SQLiteOpenHelper> extends ContentProvider {

    private ProviderDelegateRegistry<T> mRegistry;
    protected ContentResolver mContentResolver;
    protected T mDatabaseHelper;

    @Override public boolean onCreate() {
        mRegistry = getRegistry();
        mDatabaseHelper = getDatabaseHelper();
        mContentResolver = getContext().getContentResolver();

        return true;
    }

    protected abstract ProviderDelegateRegistry<T> getRegistry();

    protected abstract T getDatabaseHelper();

    @Override public String getType(Uri uri) {
        return mRegistry.getDelegate(uri).getType();
    }

    @Override public Cursor query(
        Uri uri, String[] projection, String selection, String[] selectionArgs,
        String sortOrder) {
        return mRegistry.getDelegate(uri)
            .query(
                mDatabaseHelper, mContentResolver, uri, projection, selection,
                selectionArgs, sortOrder);
    }

    @Override public Uri insert(Uri uri, ContentValues values) {
        return mRegistry.getDelegate(uri)
            .insert(mDatabaseHelper, mContentResolver, uri, values);
    }

    @Override public int bulkInsert(Uri uri, ContentValues[] values) {
        return mRegistry.getDelegate(uri)
            .bulkInsert(mDatabaseHelper, mContentResolver, uri, values);
    }

    @Override public int delete(Uri uri, String selection, String[] selectionArgs) {
        return mRegistry.getDelegate(uri)
            .delete(mDatabaseHelper, mContentResolver, uri, selection, selectionArgs);
    }

    @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return mRegistry.getDelegate(uri)
            .update(
                mDatabaseHelper, mContentResolver, uri, values, selection, selectionArgs);
    }
}