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/*
* Copyright (C) 2014 The CyanogenMod 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.cyanogenmod.eleven.provider;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import java.util.ArrayList;
public class SearchHistory {
/* Maximum # of items in the db */
private static final int MAX_ITEMS_IN_DB = 25;
private static SearchHistory sInstance = null;
private MusicDB mMusicDatabase = null;
public SearchHistory(final Context context) {
mMusicDatabase = MusicDB.getInstance(context);
}
public void onCreate(final SQLiteDatabase db) {
db.execSQL("CREATE TABLE IF NOT EXISTS " + SearchHistoryColumns.NAME + " ("
+ SearchHistoryColumns.SEARCHSTRING + " STRING NOT NULL,"
+ SearchHistoryColumns.TIMESEARCHED + " LONG NOT NULL);");
}
public void onUpgrade(final SQLiteDatabase db, final int oldVersion, final int newVersion) {
// No upgrade path needed yet
}
public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// If we ever have downgrade, drop the table to be safe
db.execSQL("DROP TABLE IF EXISTS " + SearchHistoryColumns.NAME);
onCreate(db);
}
/**
* @param context The {@link android.content.Context} to use
* @return A new instance of this class.
*/
public static final synchronized SearchHistory getInstance(final Context context) {
if (sInstance == null) {
sInstance = new SearchHistory(context.getApplicationContext());
}
return sInstance;
}
/**
* Used to save a search request into the db. This function will remove any old
* searches for that string before inserting it into the db
* @param searchString The string that has been searched
*/
public void addSearchString(final String searchString) {
if (searchString == null) {
return;
}
String trimmedString = searchString.trim();
if (trimmedString.isEmpty()) {
return;
}
final SQLiteDatabase database = mMusicDatabase.getWritableDatabase();
database.beginTransaction();
try {
// delete existing searches with the same search string
database.delete(SearchHistoryColumns.NAME,
SearchHistoryColumns.SEARCHSTRING + " = ? COLLATE NOCASE",
new String[] { trimmedString });
// add the entry
final ContentValues values = new ContentValues(2);
values.put(SearchHistoryColumns.SEARCHSTRING, trimmedString);
values.put(SearchHistoryColumns.TIMESEARCHED, System.currentTimeMillis());
database.insert(SearchHistoryColumns.NAME, null, values);
// if our db is too large, delete the extra items
Cursor oldest = null;
try {
database.query(SearchHistoryColumns.NAME,
new String[]{SearchHistoryColumns.TIMESEARCHED}, null, null, null, null,
SearchHistoryColumns.TIMESEARCHED + " ASC");
if (oldest != null && oldest.getCount() > MAX_ITEMS_IN_DB) {
oldest.moveToPosition(oldest.getCount() - MAX_ITEMS_IN_DB);
long timeOfRecordToKeep = oldest.getLong(0);
database.delete(SearchHistoryColumns.NAME,
SearchHistoryColumns.TIMESEARCHED + " < ?",
new String[] { String.valueOf(timeOfRecordToKeep) });
}
} finally {
if (oldest != null) {
oldest.close();
oldest = null;
}
}
} finally {
database.setTransactionSuccessful();
database.endTransaction();
}
}
/**
* Gets a cursor to the list of recently searched strings
* @param limit number of items to limit to
* @return cursor
*/
public Cursor queryRecentSearches(final String limit) {
final SQLiteDatabase database = mMusicDatabase.getReadableDatabase();
return database.query(SearchHistoryColumns.NAME,
new String[]{SearchHistoryColumns.SEARCHSTRING}, null, null, null, null,
SearchHistoryColumns.TIMESEARCHED + " DESC", limit);
}
/**
* Gets the recently searched strings
* @return list of esarched strings
*/
public ArrayList<String> getRecentSearches() {
Cursor searches = queryRecentSearches(String.valueOf(MAX_ITEMS_IN_DB));
ArrayList<String> results = new ArrayList<String>(MAX_ITEMS_IN_DB);
try {
if (searches != null && searches.moveToFirst()) {
int colIdx = searches.getColumnIndex(SearchHistoryColumns.SEARCHSTRING);
do {
results.add(searches.getString(colIdx));
} while (searches.moveToNext());
}
} finally {
if (searches != null) {
searches.close();
searches = null;
}
}
return results;
}
public interface SearchHistoryColumns {
/* Table name */
public static final String NAME = "searchhistory";
/* What was searched */
public static final String SEARCHSTRING = "searchstring";
/* Time of search */
public static final String TIMESEARCHED = "timesearched";
}
}
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