ListContentProvider.java

/*
 * Copyright (c) 2015, Nils Braden
 *
 * This file is part of ttrss-reader-fork. This program is free software; you
 * can redistribute it and/or modify it under the terms of the GNU
 * General Public License as published by the Free Software Foundation;
 * either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details. You should have received a
 * copy of the GNU General Public License along with this program; If
 * not, see http://www.gnu.org/licenses/.
 */

package org.ttrssreader.model;

import org.ttrssreader.controllers.DBHelper;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;

public class ListContentProvider extends ContentProvider {

	@SuppressWarnings("unused")
	private static final String TAG = ListContentProvider.class.getSimpleName();
	private static final String AUTHORITY = "org.ttrssreader";

	// Uri path segments
	private static final int CATS = 1;
	private static final int FEEDS = 2;
	private static final int HEADLINES = 3;

	// Params
	public static final String PARAM_CAT_ID = "categoryId";
	public static final String PARAM_FEED_ID = "feedId";
	public static final String PARAM_SELECT_FOR_CAT = "selectArticlesForCategory";

	// Public information:
	private static final String BASE_PATH_CATEGORIES = "categories";
	private static final String BASE_PATH_FEEDS = "feeds";
	private static final String BASE_PATH_HEADLINES = "headlines";

	public static final Uri CONTENT_URI_CAT = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH_CATEGORIES);
	public static final Uri CONTENT_URI_FEED = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH_FEEDS);
	public static final Uri CONTENT_URI_HEAD = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH_HEADLINES);


	private static final UriMatcher sURIMatcher = new UriMatcher(UriMatcher.NO_MATCH);

	static {
		// Request all items:
		sURIMatcher.addURI(AUTHORITY, BASE_PATH_CATEGORIES, CATS);
		sURIMatcher.addURI(AUTHORITY, BASE_PATH_FEEDS, FEEDS);
		sURIMatcher.addURI(AUTHORITY, BASE_PATH_HEADLINES, HEADLINES);
	}

	@Override
	public boolean onCreate() {
		return false;
	}

	@Override
	public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {

		// Parse parameters:
		int categoryId = -1;
		int feedId = -1;
		boolean selectArticlesForCategory = false;

		String paramCat = uri.getQueryParameter(PARAM_CAT_ID);
		if (paramCat != null) categoryId = Integer.parseInt(paramCat);

		String paramFeedId = uri.getQueryParameter(PARAM_FEED_ID);
		if (paramFeedId != null) feedId = Integer.parseInt(paramFeedId);

		String paramSelectArticles = uri.getQueryParameter(PARAM_SELECT_FOR_CAT);
		if (paramSelectArticles != null) selectArticlesForCategory = ("1".equals(paramSelectArticles));

		// Retrieve CursorHelper:
		MainCursorHelper cursorHelper;
		int uriType = sURIMatcher.match(uri);
		switch (uriType) {
			case CATS:
				cursorHelper = new CategoryCursorHelper();
				break;
			case FEEDS:
				cursorHelper = new FeedCursorHelper(categoryId);
				break;
			case HEADLINES:
				cursorHelper = new FeedHeadlineCursorHelper(feedId, categoryId, selectArticlesForCategory);
				break;
			default:
				throw new IllegalArgumentException("Unknown URI: " + uri);
		}

		Cursor cursor = cursorHelper.makeQuery(DBHelper.getInstance().getOpenHelper().getReadableDatabase());
		if (getContext() != null) cursor.setNotificationUri(getContext().getContentResolver(), uri);

		return cursor;
	}

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

	@Override
	final public Uri insert(Uri uri, ContentValues values) {
		throw new NoSuchMethodError(); // Not implemented!
	}

	@Override
	final public int delete(Uri uri, String selection, String[] selectionArgs) {
		throw new NoSuchMethodError(); // Not implemented!
	}

	@Override
	final public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
		throw new NoSuchMethodError(); // Not implemented!
	}

}