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      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 
     52     private PrivateLog() {
     53     }
     54 
     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 
     67         private DebugHelper(final Context context) {
     68             super(context, LOG_DATABASE_NAME, null, LOG_DATABASE_VERSION);
     69         }
     70 
     71         @Override
     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
     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 
     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 
     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