1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 
17 package com.android.inputmethod.dictionarypack;
18 
19 import android.content.ContentValues;
20 import android.content.Context;
21 import android.database.sqlite.SQLiteDatabase;
22 import android.database.sqlite.SQLiteOpenHelper;
23 
24 import java.text.SimpleDateFormat;
25 import java.util.Date;
26 import java.util.Locale;
27 
28 /**
29  * Class to keep long-term log. This is inactive in production, and is only for debug purposes.
30  */
31 public class PrivateLog {
32 
33     public static final boolean DEBUG = DictionaryProvider.DEBUG;
34 
35     private static final String LOG_DATABASE_NAME = "log";
36     private static final String LOG_TABLE_NAME = "log";
37     private static final int LOG_DATABASE_VERSION = 1;
38 
39     private static final String COLUMN_DATE = "date";
40     private static final String COLUMN_EVENT = "event";
41 
42     private static final String LOG_TABLE_CREATE = "CREATE TABLE " + LOG_TABLE_NAME + " ("
43             + COLUMN_DATE + " TEXT,"
44             + COLUMN_EVENT + " TEXT);";
45 
46     private static final SimpleDateFormat sDateFormat =
47             new SimpleDateFormat("yyyy/MM/dd HH:mm:ss", Locale.US);
48 
49     private static PrivateLog sInstance = new PrivateLog();
50     private static DebugHelper sDebugHelper = null;
51 
PrivateLog()52     private PrivateLog() {
53     }
54 
getInstance(final Context context)55     public static synchronized PrivateLog getInstance(final Context context) {
56         if (!DEBUG) return sInstance;
57         synchronized(PrivateLog.class) {
58             if (sDebugHelper == null) {
59                 sDebugHelper = new DebugHelper(context);
60             }
61             return sInstance;
62         }
63     }
64 
65     private static class DebugHelper extends SQLiteOpenHelper {
66 
DebugHelper(final Context context)67         private DebugHelper(final Context context) {
68             super(context, LOG_DATABASE_NAME, null, LOG_DATABASE_VERSION);
69         }
70 
71         @Override
onCreate(SQLiteDatabase db)72         public void onCreate(SQLiteDatabase db) {
73             if (!DEBUG) return;
74             db.execSQL(LOG_TABLE_CREATE);
75             insert(db, "Created table");
76         }
77 
78         @Override
onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)79         public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
80             if (!DEBUG) return;
81             // Remove all data.
82             db.execSQL("DROP TABLE IF EXISTS " + LOG_TABLE_NAME);
83             onCreate(db);
84             insert(db, "Upgrade finished");
85         }
86 
insert(SQLiteDatabase db, String event)87         private static void insert(SQLiteDatabase db, String event) {
88             if (!DEBUG) return;
89             final ContentValues c = new ContentValues(2);
90             c.put(COLUMN_DATE, sDateFormat.format(new Date(System.currentTimeMillis())));
91             c.put(COLUMN_EVENT, event);
92             db.insert(LOG_TABLE_NAME, null, c);
93         }
94 
95     }
96 
log(String event)97     public static void log(String event) {
98         if (!DEBUG) return;
99         final SQLiteDatabase l = sDebugHelper.getWritableDatabase();
100         DebugHelper.insert(l, event);
101     }
102 }
103