Sunny Goyal
126 lines
3.8 KiB
Java
126 lines
3.8 KiB
Java
package com.android.launcher3.util;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteException;
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import android.database.sqlite.SQLiteFullException;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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/**
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* An extension of {@link SQLiteOpenHelper} with utility methods for a single table cache DB.
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* Any exception during write operations are ignored, and any version change causes a DB reset.
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*/
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public abstract class SQLiteCacheHelper {
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private static final String TAG = "SQLiteCacheHelper";
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private static final boolean IN_MEMORY_CACHE = false;
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private final String mTableName;
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private final MySQLiteOpenHelper mOpenHelper;
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private boolean mIgnoreWrites;
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public SQLiteCacheHelper(Context context, String name, int version, String tableName) {
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if (IN_MEMORY_CACHE) {
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name = null;
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}
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mTableName = tableName;
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mOpenHelper = new MySQLiteOpenHelper(context, name, version);
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mIgnoreWrites = false;
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}
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/**
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* @see SQLiteDatabase#delete(String, String, String[])
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*/
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public void delete(String whereClause, String[] whereArgs) {
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if (mIgnoreWrites) {
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return;
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}
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try {
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mOpenHelper.getWritableDatabase().delete(mTableName, whereClause, whereArgs);
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} catch (SQLiteFullException e) {
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onDiskFull(e);
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} catch (SQLiteException e) {
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Log.d(TAG, "Ignoring sqlite exception", e);
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}
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}
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/**
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* @see SQLiteDatabase#insertWithOnConflict(String, String, ContentValues, int)
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*/
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public void insertOrReplace(ContentValues values) {
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if (mIgnoreWrites) {
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return;
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}
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try {
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mOpenHelper.getWritableDatabase().insertWithOnConflict(
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mTableName, null, values, SQLiteDatabase.CONFLICT_REPLACE);
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} catch (SQLiteFullException e) {
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onDiskFull(e);
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} catch (SQLiteException e) {
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Log.d(TAG, "Ignoring sqlite exception", e);
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}
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}
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private void onDiskFull(SQLiteFullException e) {
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Log.e(TAG, "Disk full, all write operations will be ignored", e);
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mIgnoreWrites = true;
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}
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/**
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* @see SQLiteDatabase#query(String, String[], String, String[], String, String, String)
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*/
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public Cursor query(String[] columns, String selection, String[] selectionArgs) {
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return mOpenHelper.getReadableDatabase().query(
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mTableName, columns, selection, selectionArgs, null, null, null);
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}
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public void clear() {
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mOpenHelper.clearDB(mOpenHelper.getWritableDatabase());
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}
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public void close() {
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mOpenHelper.close();
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}
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protected abstract void onCreateTable(SQLiteDatabase db);
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/**
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* A private inner class to prevent direct DB access.
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*/
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private class MySQLiteOpenHelper extends NoLocaleSQLiteHelper {
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public MySQLiteOpenHelper(Context context, String name, int version) {
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super(context, name, version);
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}
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@Override
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public void onCreate(SQLiteDatabase db) {
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onCreateTable(db);
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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if (oldVersion != newVersion) {
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clearDB(db);
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}
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}
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@Override
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public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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if (oldVersion != newVersion) {
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clearDB(db);
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}
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}
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private void clearDB(SQLiteDatabase db) {
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db.execSQL("DROP TABLE IF EXISTS " + mTableName);
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onCreate(db);
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}
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}
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}
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