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package net.micode.notes.data;
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//说明当前文件所在包
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import android.app.SearchManager;
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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.Intent;
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import android.content.UriMatcher;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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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 net.micode.notes.R;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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//为存储和获取数据提供接口。可以在不同的应用程序之间共享数据
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//ContentProvider提供的方法
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//query：查询
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//insert：插入
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//update：更新
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//delete：删除
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//getType：得到数据类型
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public class NotesProvider extends ContentProvider {
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// UriMatcher用于匹配Uri
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private static final UriMatcher mMatcher;
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//数据库辅助类的实例对象
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private NotesDatabaseHelper mHelper;
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//写入日志时的标签名
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private static final String TAG = "NotesProvider";
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//Uri资源的ID共6个
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private static final int URI_NOTE = 1;
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private static final int URI_NOTE_ITEM = 2;
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private static final int URI_DATA = 3;
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private static final int URI_DATA_ITEM = 4;
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private static final int URI_SEARCH = 5;
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private static final int URI_SEARCH_SUGGEST = 6;
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static {
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// 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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// 把需要匹配Uri路径全部给注册上
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
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}
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/**
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* x'0A' represents the '\n' character in sqlite. For title and content in the search result,
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* we will trim '\n' and white space in order to show more information.
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*/
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// 声明 字符串NOTES_SEARCH_PROJECTION,作为实参，相当于where语句
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private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
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+ NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
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+ "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
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+ R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
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+ "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
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+ "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
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// 声明NOTES_SNIPPET_SEARCH_QUERY，作用同上
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private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
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+ " FROM " + TABLE.NOTE
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+ " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
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+ " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
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+ " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
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@Override
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// Context只有在onCreate()中才被初始化
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// 对mHelper进行实例化
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public boolean onCreate() {
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mHelper = NotesDatabaseHelper.getInstance(getContext());
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return true;
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}
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@Override
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// 查询uri在数据库中对应的位置
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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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//先声明一个游标
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Cursor c = null;
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// 获取可读数据库
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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// 匹配查找uri
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switch (mMatcher.match(uri)) {
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// 对于不同的匹配值，在数据库中查找相应的条目
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case URI_NOTE:
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
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sortOrder);
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break;
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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1);
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c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);
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break;
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case URI_DATA:
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
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sortOrder);
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break;
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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1);
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c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs, null, null, sortOrder);
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break;
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case URI_SEARCH:
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case URI_SEARCH_SUGGEST:
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if (sortOrder != null || projection != null) {
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// 不合法的参数异常
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throw new IllegalArgumentException(
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"do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
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}
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String searchString = null;
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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if (uri.getPathSegments().size() > 1) {
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// getPathSegments()方法得到一个String的List，
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// 在uri.getPathSegments().get(1)为第2个元素
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searchString = uri.getPathSegments().get(1);
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}
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} else {
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//利用URi的getQueryParameter方法可以获取字符串参数
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searchString = uri.getQueryParameter("pattern");
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}
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if (TextUtils.isEmpty(searchString)) {
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return null;
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}
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try {
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searchString = String.format("%%%s%%", searchString);
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//通过上文得到的搜索字符串进行格式加工，然后用于下面数据库查询条件
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c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
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new String[] { searchString });
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} catch (IllegalStateException ex) {
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//捕捉异常
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Log.e(TAG, "got exception: " + ex.toString());
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}
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break;
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default:
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// 抛出异常
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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if (c != null) {
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//若getContentResolver发生变化，就接收通知
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c.setNotificationUri(getContext().getContentResolver(), uri);
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}
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return c;
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}
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@Override
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// 插入一个uri
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public Uri insert(Uri uri, ContentValues values) {
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// 获得可写的数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();
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long dataId = 0, noteId = 0, insertedId = 0;
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switch (mMatcher.match(uri)) {
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// 新增一个条目
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case URI_NOTE:
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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break;
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// 如果存在，查找NOTE_ID
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case URI_DATA:
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if (values.containsKey(DataColumns.NOTE_ID)) {
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noteId = values.getAsLong(DataColumns.NOTE_ID);
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} else {
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Log.d(TAG, "Wrong data format without note id:" + values.toString());
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}
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insertedId = dataId = db.insert(TABLE.DATA, null, values);
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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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// Notify the note uri
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// 获的一个content对象，若发生了变化则调用getContentResolver，由notifyChange对监听它的对象进行通知
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if (noteId > 0) {
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
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}
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// Notify the data uri
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//更新Data ID
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if (dataId > 0) {
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getContext().getContentResolver().notifyChange(
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ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
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}
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// 返回插入的uri的路径
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return ContentUris.withAppendedId(uri, insertedId);
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}
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@Override
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// 删除一个uri
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public int delete(Uri uri, String selection, String[] selectionArgs) {
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//Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示。
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int count = 0;
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String id = null;
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// 获得可写的数据库
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean deleteData = false;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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//筛选语句如下
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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//删除相应数据
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count = db.delete(TABLE.NOTE, selection, selectionArgs);
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break;
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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1);
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/**
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* ID that smaller than 0 is system folder which is not allowed to
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* trash
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*/
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long noteId = Long.valueOf(id);
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//将ID值转为长整数
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if (noteId <= 0) {
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break;
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}
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//执行删除操作，三个参数分别为要删除的表，删除筛选条件，
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count = db.delete(TABLE.NOTE,
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NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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break;
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case URI_DATA:
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count = db.delete(TABLE.DATA, selection, selectionArgs);
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deleteData = true;
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break;
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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1);
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count = db.delete(TABLE.DATA,
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DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
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deleteData = true;
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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 (count > 0) {
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//判断是否进行了删除操作，并对监听了删除操作的其他部分给予提醒
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if (deleteData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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getContext().getContentResolver().notifyChange(uri, null);
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}
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return count;
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}
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@Override
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// 更新一个uri
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public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
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int count = 0;
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String id = null;
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SQLiteDatabase db = mHelper.getWritableDatabase();
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boolean updateData = false;
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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//note版本更新，数据更新，以下各部分一致
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increaseNoteVersion(-1, selection, selectionArgs);
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count = db.update(TABLE.NOTE, values, selection, selectionArgs);
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break;
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case URI_NOTE_ITEM:
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id = uri.getPathSegments().get(1);
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increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
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count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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break;
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case URI_DATA:
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count = db.update(TABLE.DATA, values, selection, selectionArgs);
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updateData = true;
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break;
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case URI_DATA_ITEM:
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id = uri.getPathSegments().get(1);
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count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
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+ parseSelection(selection), selectionArgs);
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updateData = true;
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break;
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default:
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//查询异常处理
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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//在执行了更新的操作之后，要对监听更新操作的其他部分给予提醒
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if (count > 0) {
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if (updateData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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}
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getContext().getContentResolver().notifyChange(uri, null);
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}
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return count;
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}
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// 将字符串解析成规定格式
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private String parseSelection(String selection) {
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return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
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}
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//增加一个noteVersion
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private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
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StringBuilder sql = new StringBuilder(120);
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sql.append("UPDATE ");
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sql.append(TABLE.NOTE);
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sql.append(" SET ");
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sql.append(NoteColumns.VERSION);
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sql.append("=" + NoteColumns.VERSION + "+1 ");
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if (id > 0 || !TextUtils.isEmpty(selection)) {
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sql.append(" WHERE ");
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}
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if (id > 0) {
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sql.append(NoteColumns.ID + "=" + String.valueOf(id));
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}
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if (!TextUtils.isEmpty(selection)) {
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String selectString = id > 0 ? parseSelection(selection) : selection;
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for (String args : selectionArgs) {
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selectString = selectString.replaceFirst("\\?", args);
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}
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sql.append(selectString);
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}
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// execSQL()方法可以执行insert、delete、update和CREATE TABLE之类有更改行为的SQL语句
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mHelper.getWritableDatabase().execSQL(sql.toString());
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}
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@Override
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public String getType(Uri uri) {
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// TODO Auto-generated method stub
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return null;
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}
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} |
