Artifact
c2d57054e5e1566c1b22debc8b963b0fedf58cb5:
/*
* Copyright (C) 2006 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;
import android.database.Cursor;
import android.database.CursorWindow;
/* import org.apache.commons.codec.binary.Hex; */
import android.content.ContentValues;
import android.content.Context;
import android.content.OperationApplicationException;
import org.sqlite.database.sqlite.SQLiteAbortException;
import org.sqlite.database.sqlite.SQLiteConstraintException;
import org.sqlite.database.sqlite.SQLiteDatabase;
import org.sqlite.database.sqlite.SQLiteDatabaseCorruptException;
import org.sqlite.database.sqlite.SQLiteDiskIOException;
import org.sqlite.database.sqlite.SQLiteException;
import org.sqlite.database.sqlite.SQLiteFullException;
import org.sqlite.database.sqlite.SQLiteProgram;
import org.sqlite.database.sqlite.SQLiteStatement;
import org.sqlite.os.OperationCanceledException;
import android.os.Parcel;
import android.os.ParcelFileDescriptor;
import android.text.TextUtils;
import android.util.Log;
import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.text.Collator;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
/**
* Static utility methods for dealing with databases and {@link Cursor}s.
*/
public class ExtraUtils {
private static final String TAG = "ExtraUtils";
private static final boolean DEBUG = false;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_SELECT = 1;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_UPDATE = 2;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_ATTACH = 3;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_BEGIN = 4;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_COMMIT = 5;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_ABORT = 6;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_PRAGMA = 7;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_DDL = 8;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_UNPREPARED = 9;
/** One of the values returned by {@link #getSqlStatementType(String)}. */
public static final int STATEMENT_OTHER = 99;
/**
* Returns column index of "_id" column, or -1 if not found.
*/
public static int findRowIdColumnIndex(String[] columnNames) {
int length = columnNames.length;
for (int i = 0; i < length; i++) {
if (columnNames[i].equals("_id")) {
return i;
}
}
return -1;
}
/**
* Picks a start position for {@link Cursor#fillWindow} such that the
* window will contain the requested row and a useful range of rows
* around it.
*
* When the data set is too large to fit in a cursor window, seeking the
* cursor can become a very expensive operation since we have to run the
* query again when we move outside the bounds of the current window.
*
* We try to choose a start position for the cursor window such that
* 1/3 of the window's capacity is used to hold rows before the requested
* position and 2/3 of the window's capacity is used to hold rows after the
* requested position.
*
* @param cursorPosition The row index of the row we want to get.
* @param cursorWindowCapacity The estimated number of rows that can fit in
* a cursor window, or 0 if unknown.
* @return The recommended start position, always less than or equal to
* the requested row.
* @hide
*/
public static int cursorPickFillWindowStartPosition(
int cursorPosition, int cursorWindowCapacity) {
return Math.max(cursorPosition - cursorWindowCapacity / 3, 0);
}
/**
* Returns data type of the given object's value.
*<p>
* Returned values are
* <ul>
* <li>{@link Cursor#FIELD_TYPE_NULL}</li>
* <li>{@link Cursor#FIELD_TYPE_INTEGER}</li>
* <li>{@link Cursor#FIELD_TYPE_FLOAT}</li>
* <li>{@link Cursor#FIELD_TYPE_STRING}</li>
* <li>{@link Cursor#FIELD_TYPE_BLOB}</li>
*</ul>
*</p>
*
* @param obj the object whose value type is to be returned
* @return object value type
*/
public static int getTypeOfObject(Object obj) {
if (obj == null) {
return Cursor.FIELD_TYPE_NULL;
} else if (obj instanceof byte[]) {
return Cursor.FIELD_TYPE_BLOB;
} else if (obj instanceof Float || obj instanceof Double) {
return Cursor.FIELD_TYPE_FLOAT;
} else if (obj instanceof Long || obj instanceof Integer
|| obj instanceof Short || obj instanceof Byte) {
return Cursor.FIELD_TYPE_INTEGER;
} else {
return Cursor.FIELD_TYPE_STRING;
}
}
/**
* Utility method to run the query on the db and return the value in the
* first column of the first row.
*/
public static long longForQuery(
SQLiteDatabase db, String query, String[] selectionArgs
) {
SQLiteStatement prog = db.compileStatement(query);
try {
return longForQuery(prog, selectionArgs);
} finally {
prog.close();
}
}
/**
* Utility method to run the pre-compiled query and return the value in the
* first column of the first row.
*/
public static long longForQuery(
SQLiteStatement prog, String[] selectionArgs
) {
prog.bindAllArgsAsStrings(selectionArgs);
return prog.simpleQueryForLong();
}
}