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@ -35,89 +35,123 @@ import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.data.NotesDatabaseHelper.TABLE;
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/**
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* 笔记应用的内容提供者，用于管理笔记数据的增删改查操作
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* 实现了Android ContentProvider接口，支持跨应用数据访问
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*/
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public class NotesProvider extends ContentProvider {
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// URI匹配器，用于解析不同的URI请求
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private static final UriMatcher mMatcher;
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// 数据库帮助类实例，用于操作数据库
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private NotesDatabaseHelper mHelper;
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private static final String TAG = "NotesProvider";
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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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// URI匹配码定义
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private static final int URI_NOTE = 1; // 笔记集合URI
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private static final int URI_NOTE_ITEM = 2; // 单条笔记URI
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private static final int URI_DATA = 3; // 笔记数据集合URI
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private static final int URI_DATA_ITEM = 4; // 单条笔记数据URI
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private static final int URI_SEARCH = 5; // 搜索URI
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private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI
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// 静态代码块：初始化URI匹配器
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static {
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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// 注册笔记相关URI
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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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// 注册笔记数据相关URI
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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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// 注册搜索相关URI
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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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* 搜索投影定义：指定搜索结果的字段映射
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* 包含ID、搜索建议文本、图标、意图动作等搜索管理器所需字段
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* 处理了文本中的换行符(x'0A')和空格，优化显示效果
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*/
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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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+ 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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/**
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* 搜索查询SQL：从笔记表中查询包含搜索词的记录
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* 条件：排除垃圾桶文件夹(PARENT_ID != 垃圾桶ID)、仅普通笔记(TYPE=NOTE)
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*/
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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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+ " 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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/**
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* 内容提供者初始化方法
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* 初始化数据库帮助类实例
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*/
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@Override
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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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/**
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* 数据查询方法
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* 根据URI匹配结果执行不同的查询逻辑
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* @param uri 请求URI
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* @param projection 返回字段
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* @param selection 条件子句
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* @param selectionArgs 条件参数
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* @param sortOrder 排序规则
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* @return 查询结果Cursor
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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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String sortOrder) {
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Cursor c = null;
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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// 根据URI匹配结果执行不同查询
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switch (mMatcher.match(uri)) {
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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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// 查询所有笔记
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c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
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break;
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case URI_NOTE_ITEM:
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// 查询单条笔记，通过URI路径获取ID
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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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// 查询所有笔记数据
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c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
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break;
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case URI_DATA_ITEM:
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// 查询单条笔记数据，通过URI路径获取ID
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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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// 搜索相关查询，不允许指定排序和投影
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if (sortOrder != null || projection != null) {
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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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// 从URI路径或查询参数获取搜索词
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if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
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if (uri.getPathSegments().size() > 1) {
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searchString = uri.getPathSegments().get(1);
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@ -131,7 +165,9 @@ public class NotesProvider extends ContentProvider {
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}
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try {
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// 构造模糊查询参数
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searchString = String.format("%%%s%%", searchString);
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// 执行搜索SQL
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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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@ -141,21 +177,32 @@ public class NotesProvider extends ContentProvider {
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 设置数据变更通知
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if (c != null) {
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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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/**
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* 数据插入方法
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* 根据URI匹配结果插入不同类型数据
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* @param uri 插入目标URI
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* @param values 插入数据
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* @return 插入后的URI
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*/
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@Override
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public Uri insert(Uri uri, ContentValues values) {
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SQLiteDatabase db = mHelper.getWritableDatabase();
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long dataId = 0, noteId = 0, insertedId = 0;
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// 根据URI匹配结果执行不同插入逻辑
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 插入笔记记录
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insertedId = noteId = db.insert(TABLE.NOTE, null, values);
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break;
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case URI_DATA:
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// 插入笔记数据记录，需关联笔记ID
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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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@ -166,13 +213,13 @@ public class NotesProvider extends ContentProvider {
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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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// 通知数据变更：笔记URI
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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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// 通知数据变更：数据URI
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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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@ -181,22 +228,32 @@ public class NotesProvider extends ContentProvider {
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return ContentUris.withAppendedId(uri, insertedId);
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}
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/**
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* 数据删除方法
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* 根据URI匹配结果删除不同类型数据
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* @param uri 删除目标URI
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* @param selection 条件子句
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* @param selectionArgs 条件参数
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* @return 删除的记录数
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*/
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@Override
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public int delete(Uri uri, 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 deleteData = false;
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// 根据URI匹配结果执行不同删除逻辑
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switch (mMatcher.match(uri)) {
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case URI_NOTE:
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// 删除多条笔记，补充ID>0条件（排除系统文件夹）
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selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
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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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// 删除单条笔记，通过URI路径获取ID
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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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* ID小于等于0为系统文件夹，不允许删除
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*/
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long noteId = Long.valueOf(id);
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if (noteId <= 0) {
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@ -206,10 +263,12 @@ public class NotesProvider extends ContentProvider {
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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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// 删除笔记数据
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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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// 删除单条笔记数据，通过URI路径获取ID
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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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@ -218,6 +277,7 @@ public class NotesProvider extends ContentProvider {
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default:
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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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// 通知数据变更
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if (count > 0) {
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if (deleteData) {
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getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
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@ -227,28 +287,42 @@ public class NotesProvider extends ContentProvider {
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return count;
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}
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/**
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* 数据更新方法
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* 根据URI匹配结果更新不同类型数据
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* @param uri 更新目标URI
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* @param values 更新数据
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* @param selection 条件子句
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* @param selectionArgs 条件参数
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* @return 更新的记录数
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*/
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@Override
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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;
|
|
|
|
|
// 根据URI匹配结果执行不同更新逻辑
|
|
|
|
|
switch (mMatcher.match(uri)) {
|
|
|
|
|
case URI_NOTE:
|
|
|
|
|
// 更新多条笔记前，先增加版本号
|
|
|
|
|
increaseNoteVersion(-1, selection, selectionArgs);
|
|
|
|
|
count = db.update(TABLE.NOTE, values, selection, selectionArgs);
|
|
|
|
|
break;
|
|
|
|
|
case URI_NOTE_ITEM:
|
|
|
|
|
// 更新单条笔记前，先增加版本号
|
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
|
increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
|
|
|
|
|
count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
|
|
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
|
|
break;
|
|
|
|
|
case URI_DATA:
|
|
|
|
|
// 更新笔记数据
|
|
|
|
|
count = db.update(TABLE.DATA, values, selection, selectionArgs);
|
|
|
|
|
updateData = true;
|
|
|
|
|
break;
|
|
|
|
|
case URI_DATA_ITEM:
|
|
|
|
|
// 更新单条笔记数据
|
|
|
|
|
id = uri.getPathSegments().get(1);
|
|
|
|
|
count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
|
|
|
|
|
+ parseSelection(selection), selectionArgs);
|
|
|
|
|
@ -258,6 +332,7 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
throw new IllegalArgumentException("Unknown URI " + uri);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 通知数据变更
|
|
|
|
|
if (count > 0) {
|
|
|
|
|
if (updateData) {
|
|
|
|
|
getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
|
|
|
|
|
@ -267,10 +342,21 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
return count;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 解析查询条件：拼接额外的WHERE子句
|
|
|
|
|
* @param selection 原始条件
|
|
|
|
|
* @return 拼接后的条件
|
|
|
|
|
*/
|
|
|
|
|
private String parseSelection(String selection) {
|
|
|
|
|
return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 增加笔记版本号：用于数据变更追踪
|
|
|
|
|
* @param id 笔记ID（-1表示批量更新）
|
|
|
|
|
* @param selection 条件子句
|
|
|
|
|
* @param selectionArgs 条件参数
|
|
|
|
|
*/
|
|
|
|
|
private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
|
|
|
|
|
StringBuilder sql = new StringBuilder(120);
|
|
|
|
|
sql.append("UPDATE ");
|
|
|
|
|
@ -279,6 +365,7 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
sql.append(NoteColumns.VERSION);
|
|
|
|
|
sql.append("=" + NoteColumns.VERSION + "+1 ");
|
|
|
|
|
|
|
|
|
|
// 构建WHERE条件
|
|
|
|
|
if (id > 0 || !TextUtils.isEmpty(selection)) {
|
|
|
|
|
sql.append(" WHERE ");
|
|
|
|
|
}
|
|
|
|
|
@ -287,19 +374,24 @@ public class NotesProvider extends ContentProvider {
|
|
|
|
|
}
|
|
|
|
|
if (!TextUtils.isEmpty(selection)) {
|
|
|
|
|
String selectString = id > 0 ? parseSelection(selection) : selection;
|
|
|
|
|
// 替换条件参数
|
|
|
|
|
for (String args : selectionArgs) {
|
|
|
|
|
selectString = selectString.replaceFirst("\\?", args);
|
|
|
|
|
}
|
|
|
|
|
sql.append(selectString);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 执行SQL
|
|
|
|
|
mHelper.getWritableDatabase().execSQL(sql.toString());
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 获取URI对应的MIME类型（未实现）
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public String getType(Uri uri) {
|
|
|
|
|
// TODO Auto-generated method stub
|
|
|
|
|
return null;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
staz