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212 lines
8.5 KiB
212 lines
8.5 KiB
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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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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 net.micode.notes.data;
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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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public class NotesProvider extends ContentProvider {
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// URI Matcher 用于将 URI 映射到相应的操作
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private static final UriMatcher mMatcher;
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// 数据库帮助类实例
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private NotesDatabaseHelper mHelper;
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// 日志标签
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private static final String TAG = "NotesProvider";
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// 定义常量用于 URI 匹配
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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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// 静态代码块，初始化 URI Matcher
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static {
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mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
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mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 匹配所有笔记
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mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配单个笔记
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mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 匹配所有数据
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mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 匹配单个数据
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mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 匹配搜索
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 匹配搜索建议
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mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 匹配搜索建议
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}
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// 搜索结果的投影（投影是查询中返回的列的集合）
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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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// 搜索的 SQL 查询
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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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public boolean onCreate() {
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// 初始化 NotesDatabaseHelper 实例
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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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* 查询操作，支持不同 URI 对应不同的查询行为。
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*
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* @param uri 查询 URI
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* @param projection 要查询的列
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* @param selection 查询条件
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* @param selectionArgs 查询条件的参数
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* @param sortOrder 排序方式
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* @return 查询结果的 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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Cursor c = null;
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SQLiteDatabase db = mHelper.getReadableDatabase();
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String id = null;
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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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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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// 确保没有传递非法的参数
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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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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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}
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} else {
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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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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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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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throw new IllegalArgumentException("Unknown URI " + uri);
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}
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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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* 插入操作，支持 URI 匹配后将数据插入到相应表中。
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*
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* @param uri 插入 URI
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* @param values 插入的数据
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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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switch (mMatcher.match(uri)) {
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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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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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// 通知 URI 的变化
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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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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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return ContentUris.withAppendedId(uri, insertedId);
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}
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/**
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* 删除操作，支持 URI 匹配后从相应表中删除数据。
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*
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* @param uri 删除的 URI
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* @param selection 删除条件
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* @param selectionArgs 删除条件的参数
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* @return 删除的行数
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*/
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