| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.calculator2; |
| |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.io.IOException; |
| import java.io.FileNotFoundException; |
| import java.io.BufferedInputStream; |
| import java.io.BufferedOutputStream; |
| import java.io.DataInputStream; |
| import java.io.DataOutputStream; |
| |
| import android.content.Context; |
| |
| class Persist { |
| private static final int LAST_VERSION = 2; |
| private static final String FILE_NAME = "calculator.data"; |
| private Context mContext; |
| |
| History history = new History(); |
| private int mDeleteMode; |
| |
| Persist(Context context) { |
| this.mContext = context; |
| } |
| |
| public void setDeleteMode(int mode) { |
| mDeleteMode = mode; |
| } |
| |
| public int getDeleteMode() { |
| return mDeleteMode; |
| } |
| |
| public void load() { |
| try { |
| InputStream is = new BufferedInputStream(mContext.openFileInput(FILE_NAME), 8192); |
| DataInputStream in = new DataInputStream(is); |
| int version = in.readInt(); |
| if (version > 1) { |
| mDeleteMode = in.readInt(); |
| } else if (version > LAST_VERSION) { |
| throw new IOException("data version " + version + "; expected " + LAST_VERSION); |
| } |
| history = new History(version, in); |
| in.close(); |
| } catch (FileNotFoundException e) { |
| Calculator.log("" + e); |
| } catch (IOException e) { |
| Calculator.log("" + e); |
| } |
| } |
| |
| public void save() { |
| try { |
| OutputStream os = new BufferedOutputStream(mContext.openFileOutput(FILE_NAME, 0), 8192); |
| DataOutputStream out = new DataOutputStream(os); |
| out.writeInt(LAST_VERSION); |
| out.writeInt(mDeleteMode); |
| history.write(out); |
| out.close(); |
| } catch (IOException e) { |
| Calculator.log("" + e); |
| } |
| } |
| } |