Back to project page PlayMusicExporter.
The source code is released under:
Copyright (c) 2015 David Schulte Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Soft...
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/* * Copyright (c) 2015 David Schulte/*w w w . java2 s . co m*/ * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package de.arcus.playmusiclib.datasources; import android.database.Cursor; import android.text.TextUtils; import java.util.LinkedList; import java.util.List; import de.arcus.playmusiclib.PlayMusicManager; /** * Universal data source */ public abstract class DataSource<T> { /** * The manager */ protected PlayMusicManager mPlayMusicManager; /** * Creates a new data source * @param playMusicManager The manager */ public DataSource(PlayMusicManager playMusicManager) { mPlayMusicManager = playMusicManager; } /** * Gets the index of the column * @param columns Table header * @param column Column * @return Index */ protected static int getColumnsIndex(String[] columns, String column) { for (int n=0; n<columns.length; n++) { // Found column if (columns[n].equals(column)) return n; } // Not found return -1; } protected abstract T getDataObject(Cursor cursor); /** * Loads all items from the database * @param table The table * @param columns All columns * @param where The where-command * @return Returns a list with all items */ protected List<T> getItems(String table, String[] columns, String where) { return getItems(table, columns, where, null); } /** * Loads all items from the database * @param table The table * @param columns All columns * @param where The where-command * @param orderBy Order * @return Returns a list with all items */ protected List<T> getItems(String table, String[] columns, String where, String orderBy) { return getItems(table, columns, where, orderBy, null); } /** * Loads all items from the database * @param table The table * @param columns All columns * @param where The where-command * @param orderBy Order * @param groupBy Group * @return Returns a list with all items */ protected List<T> getItems(String table, String[] columns, String where, String orderBy, String groupBy) { // No connection; abort if (mPlayMusicManager.getDatabase() == null || !mPlayMusicManager.getDatabase().isOpen()) return null; // Creates the list List<T> items = new LinkedList<>(); try { // Gets the first data row Cursor cursor = mPlayMusicManager.getDatabase().query(table, columns, where, null, groupBy, null, orderBy); // SQL error if (cursor == null) return null; cursor.moveToFirst(); int pos = 0; // Reads the table while (!cursor.isAfterLast()) { pos ++; // Adds the object items.add(getDataObject(cursor)); // Go to next data row cursor.moveToNext(); } } catch (Exception e) { e.printStackTrace(); return null; } return items; } /** * Loads one item from the database * @param table The table * @param columns All columns * @param where The where-command * @return Returns the item */ protected T getItem(String table, String[] columns, String where) { return getItem(table, columns, where, null); } /** * Loads one item from the database * @param table The table * @param columns All columns * @param where The where-command * @param orderBy Order * @return Returns the item */ protected T getItem(String table, String[] columns, String where, String orderBy) { return getItem(table, columns, where, orderBy, null); } /** * Loads one item from the database * @param table The table * @param columns All columns * @param where The where-command * @param orderBy Order * @param groupBy Group * @return Returns the item */ protected T getItem(String table, String[] columns, String where, String orderBy, String groupBy) { // Loads the list List<T> items = getItems(table, columns, where, orderBy, groupBy); // Gets the first item if (items.size() > 0) return items.get(0); else return null; } /** * Combines two SQL where commands with an AND operator * @param whereA Where command A * @param whereB Where command B * @return Returns a combined where command */ protected static String combineWhere(String whereA, String whereB) { return combineWhere(whereA, whereB, "AND"); } /** * Combines two SQL where commands * @param whereA Where command A * @param whereB Where command B * @param operator The operator word to use (AND or OR) * @return Returns a combined where command */ protected static String combineWhere(String whereA, String whereB, String operator) { // Combine both if (!TextUtils.isEmpty(whereA) && !TextUtils.isEmpty(whereB)) return "((" + whereA + ") " + operator + " (" + whereB + "))"; // Use only whereA if (!TextUtils.isEmpty(whereA) && TextUtils.isEmpty(whereB)) return whereA; // Use only whereB if (TextUtils.isEmpty(whereA) && !TextUtils.isEmpty(whereB)) return whereB; // No where is set return ""; } }