SQLite Android Bindings

            } finally {
                statement.close();
            }
        } finally {
            releaseReference();
        }
    }

    /**
     * Verifies that a SQL SELECT statement is valid by compiling it.
     * If the SQL statement is not valid, this method will throw a {@link SQLiteException}.
     *
     * @param sql SQL to be validated
     * @param cancellationSignal A signal to cancel the operation in progress, or null if none.
     * If the operation is canceled, then {@link OperationCanceledException} will be thrown
     * when the query is executed.
     * @throws SQLiteException if {@code sql} is invalid
     */
    public void validateSql(String sql, CancellationSignal cancellationSignal) {
        getThreadSession().prepare(sql,
                getThreadDefaultConnectionFlags(/* readOnly =*/ true), cancellationSignal, null);
    }

    /**
     * Returns true if the database is opened as read only.
     *
     * @return True if database is opened as read only.
     */
    public boolean isReadOnly() {

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
** Modified to support SQLite extensions by the SQLite developers: 
** sqlite-dev@sqlite.org.
*/


package org.sqlite.database.sqlite;

import android.content.Context;
import org.sqlite.database.DatabaseErrorHandler;
import org.sqlite.database.DefaultDatabaseErrorHandler;
import org.sqlite.database.sqlite.SQLiteDatabase.CursorFactory;
import android.util.Log;
import java.io.File;

/**
 * A helper class to manage database creation and version management.
 *
 * <p>You create a subclass implementing {@link #onCreate}, {@link #onUpgrade} and
 * optionally {@link #onOpen}, and this class takes care of opening the database
 * if it exists, creating it if it does not, and upgrading it as necessary.

    // wanted getWritableDatabase.
    private static final boolean DEBUG_STRICT_READONLY = false;

    private final Context mContext;
    private final String mName;
    private final CursorFactory mFactory;
    private final int mNewVersion;
    private final int mMinimumSupportedVersion;

    private SQLiteDatabase mDatabase;
    private boolean mIsInitializing;
    private boolean mEnableWriteAheadLogging;
    private final DatabaseErrorHandler mErrorHandler;

    /**

     *     {@link #onUpgrade} will be used to upgrade the database; if the database is
     *     newer, {@link #onDowngrade} will be used to downgrade the database
     * @param errorHandler the {@link DatabaseErrorHandler} to be used when sqlite reports database
     * corruption, or null to use the default error handler.
     */
    public SQLiteOpenHelper(Context context, String name, CursorFactory factory, int version,
            DatabaseErrorHandler errorHandler) {
        this(context, name, factory, version, 0, errorHandler);
    }

    /**
     * Same as {@link #SQLiteOpenHelper(Context, String, CursorFactory, int, DatabaseErrorHandler)}
     * but also accepts an integer minimumSupportedVersion as a convenience for upgrading very old
     * versions of this database that are no longer supported. If a database with older version that
     * minimumSupportedVersion is found, it is simply deleted and a new database is created with the
     * given name and version
     *
     * @param context to use to open or create the database
     * @param name the name of the database file, null for a temporary in-memory database
     * @param factory to use for creating cursor objects, null for default
     * @param version the required version of the database
     * @param minimumSupportedVersion the minimum version that is supported to be upgraded to
     *            {@code version} via {@link #onUpgrade}. If the current database version is lower
     *            than this, database is simply deleted and recreated with the version passed in
     *            {@code version}. {@link #onBeforeDelete} is called before deleting the database
     *            when this happens. This is 0 by default.
     * @param errorHandler the {@link DatabaseErrorHandler} to be used when sqlite reports database
     *            corruption, or null to use the default error handler.
     * @see #onBeforeDelete(SQLiteDatabase)
     * @see #SQLiteOpenHelper(Context, String, CursorFactory, int, DatabaseErrorHandler)
     * @see #onUpgrade(SQLiteDatabase, int, int)
     * @hide
     */
    public SQLiteOpenHelper(Context context, String name, CursorFactory factory, int version,
            int minimumSupportedVersion, DatabaseErrorHandler errorHandler) {
        if (version < 1) throw new IllegalArgumentException("Version must be >= 1, was " + version);

        mContext = context;
        mName = name;
        mFactory = factory;
        mNewVersion = version;
        mErrorHandler = errorHandler;
        mMinimumSupportedVersion = Math.max(0, minimumSupportedVersion);
    }

    /**
     * Return the name of the SQLite database being opened, as given to
     * the constructor.
     */
    public String getDatabaseName() {

                try {
                    if (DEBUG_STRICT_READONLY && !writable) {
                        final String path = mContext.getDatabasePath(mName).getPath();
                        db = SQLiteDatabase.openDatabase(path, mFactory,
                                SQLiteDatabase.OPEN_READONLY, mErrorHandler);
                    } else {
                        db = SQLiteDatabase.openOrCreateDatabase(
                                mName, mFactory, mErrorHandler
                            mName, mFactory, mErrorHandler
                        );
                    }
                } catch (SQLiteException ex) {
                    if (writable) {
                        throw ex;
                    }
                    Log.e(TAG, "Couldn't open " + mName

            final int version = db.getVersion();
            if (version != mNewVersion) {
                if (db.isReadOnly()) {
                    throw new SQLiteException("Can't upgrade read-only database from version " +
                            db.getVersion() + " to " + mNewVersion + ": " + mName);
                }

                if (version > 0 && version < mMinimumSupportedVersion) {
                    File databaseFile = new File(db.getPath());
                    onBeforeDelete(db);
                    db.close();
                    if (SQLiteDatabase.deleteDatabase(databaseFile)) {
                        mIsInitializing = false;
                        return getDatabaseLocked(writable);
                    } else {
                        throw new IllegalStateException("Unable to delete obsolete database "
                                + mName + " with version " + version);
                    }
                } else {
                db.beginTransaction();
                try {
                    if (version == 0) {
                        onCreate(db);
                    } else {
                        if (version > mNewVersion) {
                            onDowngrade(db, version, mNewVersion);
                        } else {
                            onUpgrade(db, version, mNewVersion);
                        }
                    }
                    db.setVersion(mNewVersion);
                    db.setTransactionSuccessful();
                } finally {
                    db.endTransaction();
                    db.beginTransaction();
                    try {
                        if (version == 0) {
                            onCreate(db);
                        } else {
                            if (version > mNewVersion) {
                                onDowngrade(db, version, mNewVersion);
                            } else {
                                onUpgrade(db, version, mNewVersion);
                            }
                        }
                        db.setVersion(mNewVersion);
                        db.setTransactionSuccessful();
                    } finally {
                        db.endTransaction();
                    }
                }
            }

            onOpen(db);

            if (db.isReadOnly()) {
                Log.w(TAG, "Opened " + mName + " in read-only mode");

        if (mDatabase != null && mDatabase.isOpen()) {
            mDatabase.close();
            mDatabase = null;
        }
    }

    /**
     * Called when the database connection is being configured, to enable features
     * such as write-ahead logging or foreign key support.
     * Called when the database connection is being configured, to enable features such as
     * write-ahead logging or foreign key support.
     * <p>
     * This method is called before {@link #onCreate}, {@link #onUpgrade},
     * {@link #onDowngrade}, or {@link #onOpen} are called.  It should not modify
     * the database except to configure the database connection as required.
     * </p><p>
     * This method should only call methods that configure the parameters of the
     * database connection, such as {@link SQLiteDatabase#enableWriteAheadLogging}
     * {@link SQLiteDatabase#setForeignKeyConstraintsEnabled},
     * This method is called before {@link #onCreate}, {@link #onUpgrade}, {@link #onDowngrade}, or
     * {@link #onOpen} are called. It should not modify the database except to configure the
     * database connection as required.
     * </p>
     * <p>
     * This method should only call methods that configure the parameters of the database
     * connection, such as {@link SQLiteDatabase#enableWriteAheadLogging}
     * {@link SQLiteDatabase#setForeignKeyConstraintsEnabled}, {@link SQLiteDatabase#setLocale},
     * {@link SQLiteDatabase#setLocale}, {@link SQLiteDatabase#setMaximumSize},
     * or executing PRAGMA statements.
     * {@link SQLiteDatabase#setMaximumSize}, or executing PRAGMA statements.
     * </p>
     *
     * @param db The database.
     */
    public void onConfigure(SQLiteDatabase db) {}

    /**
     * Called before the database is deleted when the version returned by
     * {@link SQLiteDatabase#getVersion()} is lower than the minimum supported version passed (if at
     * all) while creating this helper. After the database is deleted, a fresh database with the
     * given version is created. This will be followed by {@link #onConfigure(SQLiteDatabase)} and
     * {@link #onCreate(SQLiteDatabase)} being called with a new SQLiteDatabase object
     *
     * @param db the database opened with this helper
     * @see #SQLiteOpenHelper(Context, String, CursorFactory, int, int, DatabaseErrorHandler)
     * @hide
     */
    public void onBeforeDelete(SQLiteDatabase db) {
    }

    /**
     * Called when the database is created for the first time. This is where the
     * creation of tables and the initial population of the tables should happen.
     *
     * @param db The database.
     */

            // The idea is to ensure that the selection clause is a valid SQL expression
            // by compiling it twice: once wrapped in parentheses and once as
            // originally specified. An attacker cannot create an expression that
            // would escape the SQL expression while maintaining balanced parentheses
            // in both the wrapped and original forms.
            String sqlForValidation = buildQuery(projectionIn, "(" + selection + ")", groupBy,
                    having, sortOrder, limit);
            validateQuerySql(db, sqlForValidation,
                    cancellationSignal); // will throw if query is invalid
            db.validateSql(sqlForValidation, cancellationSignal); // will throw if query is invalid
        }

        String sql = buildQuery(
                projectionIn, selection, groupBy, having,
                sortOrder, limit);

        if (Log.isLoggable(TAG, Log.DEBUG)) {
            Log.d(TAG, "Performing query: " + sql);
        }
        return db.rawQueryWithFactory(
                mFactory, sql, selectionArgs,
                SQLiteDatabase.findEditTable(mTables),
                cancellationSignal); // will throw if query is invalid
    }

    /**
     * Verifies that a SQL SELECT statement is valid by compiling it.
     * If the SQL statement is not valid, this method will throw a {@link SQLiteException}.
     */
    private void validateQuerySql(SQLiteDatabase db, String sql,
            CancellationSignal cancellationSignal) {
        db.getThreadSession().prepare(sql,
                db.getThreadDefaultConnectionFlags(true /*readOnly*/), cancellationSignal, null);
    }

    /**
     * Construct a SELECT statement suitable for use in a group of
     * SELECT statements that will be joined through UNION operators
     * in buildUnionQuery.
     *
     * @param projectionIn A list of which columns to return. Passing
     *    null will return all columns, which is discouraged to

        super(db, sql, bindArgs, null);
    }

    /**
     * Execute this SQL statement, if it is not a SELECT / INSERT / DELETE / UPDATE, for example
     * CREATE / DROP table, view, trigger, index etc.
     *
     * @throws org.sqlite.database.SQLException If the SQL string is invalid for
     * @throws android.database.SQLException If the SQL string is invalid for
     *         some reason
     */
    public void execute() {
        acquireReference();
        try {
            getSession().execute(getSql(), getBindArgs(), getConnectionFlags(), null);
        } catch (SQLiteDatabaseCorruptException ex) {
            onCorruption();
            throw ex;
        } finally {
            releaseReference();
        }
    }

    /**
     * Execute this SQL statement, if the the number of rows affected by execution of this SQL
     * statement is of any importance to the caller - for example, UPDATE / DELETE SQL statements.
     *
     * @return the number of rows affected by this SQL statement execution.
     * @throws org.sqlite.database.SQLException If the SQL string is invalid for
     * @throws android.database.SQLException If the SQL string is invalid for
     *         some reason
     */
    public int executeUpdateDelete() {
        acquireReference();
        try {
            return getSession().executeForChangedRowCount(
                    getSql(), getBindArgs(), getConnectionFlags(), null);

    /**
     * Execute this SQL statement and return the ID of the row inserted due to this call.
     * The SQL statement should be an INSERT for this to be a useful call.
     *
     * @return the row ID of the last row inserted, if this insert is successful. -1 otherwise.
     *
     * @throws org.sqlite.database.SQLException If the SQL string is invalid for
     * @throws android.database.SQLException If the SQL string is invalid for
     *         some reason
     */
    public long executeInsert() {
        acquireReference();
        try {
            return getSession().executeForLastInsertedRowId(
                    getSql(), getBindArgs(), getConnectionFlags(), null);

    /**
     * Execute a statement that returns a 1 by 1 table with a numeric value.
     * For example, SELECT COUNT(*) FROM table;
     *
     * @return The result of the query.
     *
     * @throws org.sqlite.database.sqlite.SQLiteDoneException if the query returns zero rows
     * @throws android.database.sqlite.SQLiteDoneException if the query returns zero rows
     */
    public long simpleQueryForLong() {
        acquireReference();
        try {
            return getSession().executeForLong(
                    getSql(), getBindArgs(), getConnectionFlags(), null);
        } catch (SQLiteDatabaseCorruptException ex) {
            onCorruption();
            throw ex;
        } finally {
            releaseReference();
        }
    }

    /**
     * Execute a statement that returns a 1 by 1 table with a text value.
     * For example, SELECT COUNT(*) FROM table;
     *
     * @return The result of the query.
     *
     * @throws org.sqlite.database.sqlite.SQLiteDoneException if the query returns zero rows
     * @throws android.database.sqlite.SQLiteDoneException if the query returns zero rows
     */
    public String simpleQueryForString() {
        acquireReference();
        try {
            return getSession().executeForString(
                    getSql(), getBindArgs(), getConnectionFlags(), null);
        } catch (SQLiteDatabaseCorruptException ex) {
            onCorruption();
            throw ex;
        } finally {
            releaseReference();
        }
    }

    /**
     * Executes a statement that returns a 1 by 1 table with a blob value.
     *
     * @return A read-only file descriptor for a copy of the blob value, or {@code null}
     *         if the value is null or could not be read for some reason.
     *
     * @throws org.sqlite.database.sqlite.SQLiteDoneException if the query returns zero rows
     * @throws android.database.sqlite.SQLiteDoneException if the query returns zero rows
     */
    public ParcelFileDescriptor simpleQueryForBlobFileDescriptor() {
        acquireReference();
        try {
            return getSession().executeForBlobFileDescriptor(
                    getSql(), getBindArgs(), getConnectionFlags(), null);
        } catch (SQLiteDatabaseCorruptException ex) {

/*
 * Copyright (C) 2008 Esmertec AG.
 * 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.
 */
/*
** Modified to support SQLite extensions by the SQLite developers: 
** sqlite-dev@sqlite.org.
*/

package org.sqlite.database.sqlite;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import org.sqlite.database.sqlite.SQLiteException;
import android.net.Uri;
import android.util.Log;
import android.widget.Toast;

/**
 * @hide
 */

public final class SqliteWrapper {
    private static final String TAG = "SqliteWrapper";
    private static final String SQLITE_EXCEPTION_DETAIL_MESSAGE
                = "unable to open database file";

    private SqliteWrapper() {
        // Forbidden being instantiated.
    }

    // FIXME: need to optimize this method.
    private static boolean isLowMemory(SQLiteException e) {
        return e.getMessage().equals(SQLITE_EXCEPTION_DETAIL_MESSAGE);
    }

    public static void checkSQLiteException(Context context, SQLiteException e) {
        if (isLowMemory(e)) {
            Toast.makeText(context, "low memory", Toast.LENGTH_SHORT).show();
        } else {
            throw e;
        }
    }

    public static Cursor query(Context context, ContentResolver resolver, Uri uri,
            String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        try {
            return resolver.query(uri, projection, selection, selectionArgs, sortOrder);
        } catch (SQLiteException e) {
            Log.e(TAG, "Catch a SQLiteException when query: ", e);
            checkSQLiteException(context, e);
            return null;
        }
    }

    public static boolean requery(Context context, Cursor cursor) {
        try {
            return cursor.requery();
        } catch (SQLiteException e) {
            Log.e(TAG, "Catch a SQLiteException when requery: ", e);
            checkSQLiteException(context, e);
            return false;
        }
    }
    public static int update(Context context, ContentResolver resolver, Uri uri,
            ContentValues values, String where, String[] selectionArgs) {
        try {
            return resolver.update(uri, values, where, selectionArgs);
        } catch (SQLiteException e) {
            Log.e(TAG, "Catch a SQLiteException when update: ", e);
            checkSQLiteException(context, e);
            return -1;
        }
    }

    public static int delete(Context context, ContentResolver resolver, Uri uri,
            String where, String[] selectionArgs) {
        try {
            return resolver.delete(uri, where, selectionArgs);
        } catch (SQLiteException e) {
            Log.e(TAG, "Catch a SQLiteException when delete: ", e);
            checkSQLiteException(context, e);
            return -1;
        }
    }

    public static Uri insert(Context context, ContentResolver resolver,
            Uri uri, ContentValues values) {
        try {
            return resolver.insert(uri, values);
        } catch (SQLiteException e) {
            Log.e(TAG, "Catch a SQLiteException when insert: ", e);
            checkSQLiteException(context, e);
            return null;
        }
    }
}