/*
* Copyright (C) 2009 ZXing authors
*
* 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.google.zxing.client.android.history;
import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.ArrayList;
import android.util.Log;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.client.android.Intents;
import com.google.zxing.client.android.R;
import com.google.zxing.client.android.CaptureActivity;
import com.google.zxing.Result;
/**
* <p>Manages functionality related to scan history.</p>
*
* @author Sean Owen
*/
public final class HistoryManager {
private static final String TAG = HistoryManager.class.getSimpleName();
private static final int MAX_ITEMS = 50;
private static final String[] TEXT_COL_PROJECTION = { DBHelper.TEXT_COL };
private static final String[] GET_ITEM_COL_PROJECTION = {
DBHelper.TEXT_COL,
DBHelper.FORMAT_COL,
DBHelper.TIMESTAMP_COL,
};
private static final String[] EXPORT_COL_PROJECTION = {
DBHelper.TEXT_COL,
DBHelper.DISPLAY_COL,
DBHelper.FORMAT_COL,
DBHelper.TIMESTAMP_COL,
};
private static final String[] ID_COL_PROJECTION = { DBHelper.ID_COL };
private static final DateFormat EXPORT_DATE_TIME_FORMAT = DateFormat.getDateTimeInstance();
private final CaptureActivity activity;
public HistoryManager(CaptureActivity activity) {
this.activity = activity;
}
List<Result> getHistoryItems() {
SQLiteOpenHelper helper = new DBHelper(activity);
List<Result> items = new ArrayList<Result>();
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = null;
try {
cursor = db.query(DBHelper.TABLE_NAME,
GET_ITEM_COL_PROJECTION,
null, null, null, null,
DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
Result result = new Result(cursor.getString(0),
null,
null,
BarcodeFormat.valueOf(cursor.getString(1)),
cursor.getLong(2));
items.add(result);
}
} finally {
if (cursor != null) {
cursor.close();
}
db.close();
}
return items;
}
public AlertDialog buildAlert() {
List<Result> items = getHistoryItems();
int size = items.size();
String[] dialogItems = new String[size + 2];
for (int i = 0; i < size; i++) {
dialogItems[i] = items.get(i).getText();
}
Resources res = activity.getResources();
dialogItems[dialogItems.length - 2] = res.getString(R.string.history_send);
dialogItems[dialogItems.length - 1] = res.getString(R.string.history_clear_text);
DialogInterface.OnClickListener clickListener = new HistoryClickListener(this, activity, dialogItems, items);
AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle(R.string.history_title);
builder.setItems(dialogItems, clickListener);
return builder.create();
}
public void addHistoryItem(Result result) {
if (!activity.getIntent().getBooleanExtra(Intents.Scan.SAVE_HISTORY, true)) {
return; // Do not save this item to the history.
}
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = helper.getWritableDatabase();
try {
// Delete if already exists
db.delete(DBHelper.TABLE_NAME, DBHelper.TEXT_COL + "=?", new String[] { result.getText() });
// Insert
ContentValues values = new ContentValues();
values.put(DBHelper.TEXT_COL, result.getText());
values.put(DBHelper.FORMAT_COL, result.getBarcodeFormat().toString());
values.put(DBHelper.DISPLAY_COL, result.getText()); // TODO use parsed result display value?
values.put(DBHelper.TIMESTAMP_COL, System.currentTimeMillis());
db.insert(DBHelper.TABLE_NAME, DBHelper.TIMESTAMP_COL, values);
} finally {
db.close();
}
}
public void trimHistory() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = helper.getWritableDatabase();
Cursor cursor = null;
try {
cursor = db.query(DBHelper.TABLE_NAME,
ID_COL_PROJECTION,
null, null, null, null,
DBHelper.TIMESTAMP_COL + " DESC");
int count = 0;
while (count < MAX_ITEMS && cursor.moveToNext()) {
count++;
}
while (cursor.moveToNext()) {
db.delete(DBHelper.TABLE_NAME, DBHelper.ID_COL + '=' + cursor.getString(0), null);
}
} finally {
if (cursor != null) {
cursor.close();
}
db.close();
}
}
/**
* <p>Builds a text representation of the scanning history. Each scan is encoded on one
* line, terminated by a line break (\r\n). The values in each line are comma-separated,
* and double-quoted. Double-quotes within values are escaped with a sequence of two
* double-quotes. The fields output are:</p>
*
* <ul>
* <li>Raw text</li>
* <li>Display text</li>
* <li>Format (e.g. QR_CODE)</li>
* <li>Timestamp</li>
* <li>Formatted version of timestamp</li>
* </ul>
*/
CharSequence buildHistory() {
StringBuilder historyText = new StringBuilder(1000);
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = helper.getReadableDatabase();
Cursor cursor = null;
try {
cursor = db.query(DBHelper.TABLE_NAME,
EXPORT_COL_PROJECTION,
null, null, null, null,
DBHelper.TIMESTAMP_COL + " DESC");
while (cursor.moveToNext()) {
for (int col = 0; col < EXPORT_COL_PROJECTION.length; col++) {
historyText.append('"').append(massageHistoryField(cursor.getString(col))).append("\",");
}
// Add timestamp again, formatted
long timestamp = cursor.getLong(EXPORT_COL_PROJECTION.length - 1);
historyText.append('"').append(massageHistoryField(
EXPORT_DATE_TIME_FORMAT.format(new Date(timestamp)))).append("\"\r\n");
}
} finally {
if (cursor != null) {
cursor.close();
}
db.close();
}
return historyText;
}
static Uri saveHistory(String history) {
File bsRoot = new File(Environment.getExternalStorageDirectory(), "BarcodeScanner");
File historyRoot = new File(bsRoot, "History");
if (!historyRoot.exists() && !historyRoot.mkdirs()) {
Log.w(TAG, "Couldn't make dir " + historyRoot);
return null;
}
File historyFile = new File(historyRoot, "history-" + System.currentTimeMillis() + ".csv");
OutputStreamWriter out = null;
try {
out = new OutputStreamWriter(new FileOutputStream(historyFile), Charset.forName("UTF-8"));
out.write(history);
return Uri.parse("file://" + historyFile.getAbsolutePath());
} catch (IOException ioe) {
Log.w(TAG, "Couldn't access file " + historyFile + " due to " + ioe);
return null;
} finally {
if (out != null) {
try {
out.close();
} catch (IOException ioe) {
// do nothing
}
}
}
}
private static String massageHistoryField(String value) {
return value.replace("\"","\"\"");
}
void clearHistory() {
SQLiteOpenHelper helper = new DBHelper(activity);
SQLiteDatabase db = helper.getWritableDatabase();
try {
db.delete(DBHelper.TABLE_NAME, null, null);
} finally {
db.close();
}
}
}