Initial Contribution
This commit is contained in:
The Android Open Source Project
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/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.notepad;
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import com.example.android.notepad.NotePad.Notes;
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import android.content.ContentProvider;
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import android.content.ContentUris;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.UriMatcher;
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import android.content.res.Resources;
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import android.database.Cursor;
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import android.database.SQLException;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.database.sqlite.SQLiteQueryBuilder;
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import android.net.Uri;
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import android.text.TextUtils;
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import android.util.Log;
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import java.util.HashMap;
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/**
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* Provides access to a database of notes. Each note has a title, the note
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* itself, a creation date and a modified data.
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*/
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public class NotePadProvider extends ContentProvider {
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private static final String TAG = "NotePadProvider";
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private static final String DATABASE_NAME = "note_pad.db";
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private static final int DATABASE_VERSION = 2;
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private static final String NOTES_TABLE_NAME = "notes";
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private static HashMap<String, String> sNotesProjectionMap;
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private static final int NOTES = 1;
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private static final int NOTE_ID = 2;
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private static final UriMatcher sUriMatcher;
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/**
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* This class helps open, create, and upgrade the database file.
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*/
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private static class DatabaseHelper extends SQLiteOpenHelper {
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DatabaseHelper(Context context) {
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super(context, DATABASE_NAME, null, DATABASE_VERSION);
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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db.execSQL("CREATE TABLE " + NOTES_TABLE_NAME + " ("
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+ Notes._ID + " INTEGER PRIMARY KEY,"
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+ Notes.TITLE + " TEXT,"
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+ Notes.NOTE + " TEXT,"
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+ Notes.CREATED_DATE + " INTEGER,"
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+ Notes.MODIFIED_DATE + " INTEGER"
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+ ");");
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
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+ newVersion + ", which will destroy all old data");
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db.execSQL("DROP TABLE IF EXISTS notes");
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onCreate(db);
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}
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}
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private DatabaseHelper mOpenHelper;
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@Override
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public boolean onCreate() {
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mOpenHelper = new DatabaseHelper(getContext());
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return true;
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}
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@Override
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public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
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String sortOrder) {
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SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
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switch (sUriMatcher.match(uri)) {
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case NOTES:
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qb.setTables(NOTES_TABLE_NAME);
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qb.setProjectionMap(sNotesProjectionMap);
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break;
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case NOTE_ID:
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qb.setTables(NOTES_TABLE_NAME);
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qb.setProjectionMap(sNotesProjectionMap);
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qb.appendWhere(Notes._ID + "=" + uri.getPathSegments().get(1));
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// If no sort order is specified use the default
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String orderBy;
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if (TextUtils.isEmpty(sortOrder)) {
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orderBy = NotePad.Notes.DEFAULT_SORT_ORDER;
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} else {
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orderBy = sortOrder;
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}
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// Get the database and run the query
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SQLiteDatabase db = mOpenHelper.getReadableDatabase();
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Cursor c = qb.query(db, projection, selection, selectionArgs, null, null, orderBy);
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// Tell the cursor what uri to watch, so it knows when its source data changes
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c.setNotificationUri(getContext().getContentResolver(), uri);
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return c;
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}
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@Override
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public String getType(Uri uri) {
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switch (sUriMatcher.match(uri)) {
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case NOTES:
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return Notes.CONTENT_TYPE;
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case NOTE_ID:
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return Notes.CONTENT_ITEM_TYPE;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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}
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@Override
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public Uri insert(Uri uri, ContentValues initialValues) {
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// Validate the requested uri
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if (sUriMatcher.match(uri) != NOTES) {
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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ContentValues values;
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if (initialValues != null) {
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values = new ContentValues(initialValues);
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} else {
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values = new ContentValues();
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}
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Long now = Long.valueOf(System.currentTimeMillis());
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// Make sure that the fields are all set
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if (values.containsKey(NotePad.Notes.CREATED_DATE) == false) {
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values.put(NotePad.Notes.CREATED_DATE, now);
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}
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if (values.containsKey(NotePad.Notes.MODIFIED_DATE) == false) {
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values.put(NotePad.Notes.MODIFIED_DATE, now);
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}
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if (values.containsKey(NotePad.Notes.TITLE) == false) {
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Resources r = Resources.getSystem();
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values.put(NotePad.Notes.TITLE, r.getString(android.R.string.untitled));
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}
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if (values.containsKey(NotePad.Notes.NOTE) == false) {
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values.put(NotePad.Notes.NOTE, "");
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}
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SQLiteDatabase db = mOpenHelper.getWritableDatabase();
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long rowId = db.insert(NOTES_TABLE_NAME, Notes.NOTE, values);
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if (rowId > 0) {
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Uri noteUri = ContentUris.withAppendedId(NotePad.Notes.CONTENT_URI, rowId);
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getContext().getContentResolver().notifyChange(noteUri, null);
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return noteUri;
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}
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throw new SQLException("Failed to insert row into " + uri);
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}
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@Override
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public int delete(Uri uri, String where, String[] whereArgs) {
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SQLiteDatabase db = mOpenHelper.getWritableDatabase();
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int count;
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switch (sUriMatcher.match(uri)) {
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case NOTES:
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count = db.delete(NOTES_TABLE_NAME, where, whereArgs);
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break;
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case NOTE_ID:
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String noteId = uri.getPathSegments().get(1);
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count = db.delete(NOTES_TABLE_NAME, Notes._ID + "=" + noteId
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+ (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs);
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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getContext().getContentResolver().notifyChange(uri, null);
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return count;
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}
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@Override
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public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {
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SQLiteDatabase db = mOpenHelper.getWritableDatabase();
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int count;
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switch (sUriMatcher.match(uri)) {
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case NOTES:
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count = db.update(NOTES_TABLE_NAME, values, where, whereArgs);
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break;
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case NOTE_ID:
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String noteId = uri.getPathSegments().get(1);
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count = db.update(NOTES_TABLE_NAME, values, Notes._ID + "=" + noteId
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+ (!TextUtils.isEmpty(where) ? " AND (" + where + ')' : ""), whereArgs);
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break;
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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getContext().getContentResolver().notifyChange(uri, null);
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return count;
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}
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static {
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sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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sUriMatcher.addURI(NotePad.AUTHORITY, "notes", NOTES);
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sUriMatcher.addURI(NotePad.AUTHORITY, "notes/#", NOTE_ID);
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sNotesProjectionMap = new HashMap<String, String>();
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sNotesProjectionMap.put(Notes._ID, Notes._ID);
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sNotesProjectionMap.put(Notes.TITLE, Notes.TITLE);
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sNotesProjectionMap.put(Notes.NOTE, Notes.NOTE);
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sNotesProjectionMap.put(Notes.CREATED_DATE, Notes.CREATED_DATE);
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sNotesProjectionMap.put(Notes.MODIFIED_DATE, Notes.MODIFIED_DATE);
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}
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}
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