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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of 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,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.calculator2;
     18 
     19 import java.io.InputStream;
     20 import java.io.OutputStream;
     21 import java.io.IOException;
     22 import java.io.FileNotFoundException;
     23 import java.io.BufferedInputStream;
     24 import java.io.BufferedOutputStream;
     25 import java.io.DataInputStream;
     26 import java.io.DataOutputStream;
     27 
     28 import android.content.Context;
     29 
     30 class Persist {
     31     private static final int LAST_VERSION = 2;
     32     private static final String FILE_NAME = "calculator.data";
     33     private Context mContext;
     34 
     35     History history = new History();
     36     private int mDeleteMode;
     37 
     38     Persist(Context context) {
     39         this.mContext = context;
     40     }
     41 
     42     public void setDeleteMode(int mode) {
     43         mDeleteMode = mode;
     44     }
     45 
     46     public int getDeleteMode() {
     47         return mDeleteMode;
     48     }
     49 
     50     public void load() {
     51         try {
     52             InputStream is = new BufferedInputStream(mContext.openFileInput(FILE_NAME), 8192);
     53             DataInputStream in = new DataInputStream(is);
     54             int version = in.readInt();
     55             if (version > 1) {
     56                 mDeleteMode = in.readInt();
     57             } else if (version > LAST_VERSION) {
     58                 throw new IOException("data version " + version + "; expected " + LAST_VERSION);
     59             }
     60             history = new History(version, in);
     61             in.close();
     62         } catch (FileNotFoundException e) {
     63             Calculator.log("" + e);
     64         } catch (IOException e) {
     65             Calculator.log("" + e);
     66         }
     67     }
     68 
     69     public void save() {
     70         try {
     71             OutputStream os = new BufferedOutputStream(mContext.openFileOutput(FILE_NAME, 0), 8192);
     72             DataOutputStream out = new DataOutputStream(os);
     73             out.writeInt(LAST_VERSION);
     74             out.writeInt(mDeleteMode);
     75             history.write(out);
     76             out.close();
     77         } catch (IOException e) {
     78             Calculator.log("" + e);
     79         }
     80     }
     81 }
     82