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org.sqlite.SQLiteJDBCLoader Maven / Gradle / Ivy
/*--------------------------------------------------------------------------
* Copyright 2007 Taro L. Saito
*
* 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.
*--------------------------------------------------------------------------*/
//--------------------------------------
// SQLite JDBC Project
//
// SQLite.java
// Since: 2007/05/10
//
// $URL$
// $Author$
//--------------------------------------
package org.sqlite;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.security.DigestInputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Properties;
import java.util.UUID;
import org.sqlite.util.OSInfo;
/**
* Set the system properties, org.sqlite.lib.path, org.sqlite.lib.name,
* appropriately so that the SQLite JDBC driver can find *.dll, *.jnilib and
* *.so files, according to the current OS (win, linux, mac).
*
* The library files are automatically extracted from this project's package
* (JAR).
*
* usage: call {@link #initialize()} before using SQLite JDBC driver.
*
* @author leo
*/
public class SQLiteJDBCLoader {
private static boolean extracted = false;
/**
* Loads SQLite native JDBC library.
*
* @return True if SQLite native library is successfully loaded; false otherwise.
*/
public static boolean initialize() throws Exception {
loadSQLiteNativeLibrary();
return extracted;
}
/**
* @return True if the SQLite JDBC driver is set to pure Java mode; false otherwise.
* @deprecated Pure Java no longer supported
*/
static boolean getPureJavaFlag() {
return Boolean.parseBoolean(System.getProperty("sqlite.purejava", "false"));
}
/**
* Checks if the SQLite JDBC driver is set to pure Java mode.
*
* @return True if the SQLite JDBC driver is set to pure Java mode; false otherwise.
* @deprecated Pure Java nolonger supported
*/
public static boolean isPureJavaMode() {
return false;
}
/**
* Checks if the SQLite JDBC driver is set to native mode.
*
* @return True if the SQLite JDBC driver is set to native Java mode; false otherwise.
*/
public static boolean isNativeMode() throws Exception {
// load the driver
initialize();
return extracted;
}
/**
* Computes the MD5 value of the input stream.
*
* @param input InputStream.
* @return Encrypted string for the InputStream.
* @throws IOException
* @throws NoSuchAlgorithmException
*/
static String md5sum(InputStream input) throws IOException {
BufferedInputStream in = new BufferedInputStream(input);
try {
MessageDigest digest = java.security.MessageDigest.getInstance("MD5");
DigestInputStream digestInputStream = new DigestInputStream(in, digest);
for(; digestInputStream.read() >= 0; ) {
}
ByteArrayOutputStream md5out = new ByteArrayOutputStream();
md5out.write(digest.digest());
return md5out.toString();
} catch(NoSuchAlgorithmException e) {
throw new IllegalStateException("MD5 algorithm is not available: " + e);
} finally {
in.close();
}
}
private static boolean contentsEquals(InputStream in1, InputStream in2) throws IOException {
if(!(in1 instanceof BufferedInputStream)) {
in1 = new BufferedInputStream(in1);
}
if(!(in2 instanceof BufferedInputStream)) {
in2 = new BufferedInputStream(in2);
}
int ch = in1.read();
while(ch != -1) {
int ch2 = in2.read();
if(ch != ch2) {
return false;
}
ch = in1.read();
}
int ch2 = in2.read();
return ch2 == -1;
}
/**
* Extracts and loads the specified library file to the target folder
*
* @param libFolderForCurrentOS Library path.
* @param libraryFileName Library name.
* @param targetFolder Target folder.
* @return
*/
private static boolean extractAndLoadLibraryFile(String libFolderForCurrentOS, String libraryFileName,
String targetFolder) {
String nativeLibraryFilePath = libFolderForCurrentOS + "/" + libraryFileName;
// Include architecture name in temporary filename in order to avoid conflicts
// when multiple JVMs with different architectures running at the same time
String uuid = UUID.randomUUID().toString();
String extractedLibFileName = String.format("sqlite-%s-%s-%s", getVersion(), uuid, libraryFileName);
File extractedLibFile = new File(targetFolder, extractedLibFileName);
try {
// Extract a native library file into the target directory
InputStream reader = SQLiteJDBCLoader.class.getResourceAsStream(nativeLibraryFilePath);
FileOutputStream writer = new FileOutputStream(extractedLibFile);
try {
byte[] buffer = new byte[8192];
int bytesRead = 0;
while((bytesRead = reader.read(buffer)) != -1) {
writer.write(buffer, 0, bytesRead);
}
} finally {
// Delete the extracted lib file on JVM exit.
extractedLibFile.deleteOnExit();
if(writer != null) {
writer.close();
}
if(reader != null) {
reader.close();
}
}
// Set executable (x) flag to enable Java to load the native library
extractedLibFile.setReadable(true);
extractedLibFile.setWritable(true, true);
extractedLibFile.setExecutable(true);
// Check whether the contents are properly copied from the resource folder
{
InputStream nativeIn = SQLiteJDBCLoader.class.getResourceAsStream(nativeLibraryFilePath);
InputStream extractedLibIn = new FileInputStream(extractedLibFile);
try {
if(!contentsEquals(nativeIn, extractedLibIn)) {
throw new RuntimeException(String.format("Failed to write a native library file at %s", extractedLibFile));
}
} finally {
if(nativeIn != null) {
nativeIn.close();
}
if(extractedLibIn != null) {
extractedLibIn.close();
}
}
}
return loadNativeLibrary(targetFolder, extractedLibFileName);
} catch(IOException e) {
System.err.println(e.getMessage());
return false;
}
}
/**
* Loads native library using the given path and name of the library.
*
* @param path Path of the native library.
* @param name Name of the native library.
* @return True for successfully loading; false otherwise.
*/
private static synchronized boolean loadNativeLibrary(String path, String name) {
File libPath = new File(path, name);
if(libPath.exists()) {
try {
System.load(new File(path, name).getAbsolutePath());
return true;
} catch(UnsatisfiedLinkError e) {
System.err.println(e);
return false;
}
} else {
return false;
}
}
/**
* Loads SQLite native library using given path and name of the library.
*
* @throws
*/
private static void loadSQLiteNativeLibrary() throws Exception {
if(extracted) {
return;
}
// Try loading library from org.sqlite.lib.path library path */
String sqliteNativeLibraryPath = System.getProperty("org.sqlite.lib.path");
String sqliteNativeLibraryName = System.getProperty("org.sqlite.lib.name");
if(sqliteNativeLibraryName == null) {
sqliteNativeLibraryName = System.mapLibraryName("sqlitejdbc");
if(sqliteNativeLibraryName != null && sqliteNativeLibraryName.endsWith("dylib")) {
sqliteNativeLibraryName = sqliteNativeLibraryName.replace("dylib", "jnilib");
}
}
if(sqliteNativeLibraryPath != null) {
if(loadNativeLibrary(sqliteNativeLibraryPath, sqliteNativeLibraryName)) {
extracted = true;
return;
}
}
// Load the os-dependent library from the jar file
sqliteNativeLibraryPath = "/org/sqlite/native/" + OSInfo.getNativeLibFolderPathForCurrentOS();
boolean hasNativeLib = hasResource(sqliteNativeLibraryPath + "/" + sqliteNativeLibraryName);
if(!hasNativeLib) {
if(OSInfo.getOSName().equals("Mac")) {
// Fix for openjdk7 for Mac
String altName = "libsqlitejdbc.jnilib";
if(hasResource(sqliteNativeLibraryPath + "/" + altName)) {
sqliteNativeLibraryName = altName;
hasNativeLib = true;
}
}
}
if(!hasNativeLib) {
extracted = false;
throw new Exception(String.format("No native library is found for os.name=%s and os.arch=%s", OSInfo.getOSName(), OSInfo.getArchName()));
}
// temporary library folder
String tempFolder = new File(System.getProperty("java.io.tmpdir")).getAbsolutePath();
// Try extracting the library from jar
if(extractAndLoadLibraryFile(sqliteNativeLibraryPath, sqliteNativeLibraryName, tempFolder)) {
extracted = true;
return;
}
extracted = false;
return;
}
private static boolean hasResource(String path) {
return SQLiteJDBCLoader.class.getResource(path) != null;
}
@SuppressWarnings("unused")
private static void getNativeLibraryFolderForTheCurrentOS() {
String osName = OSInfo.getOSName();
String archName = OSInfo.getArchName();
}
/**
* @return The major version of the SQLite JDBC driver.
*/
public static int getMajorVersion() {
String[] c = getVersion().split("\\.");
return (c.length > 0) ? Integer.parseInt(c[0]) : 1;
}
/**
* @return The minor version of the SQLite JDBC driver.
*/
public static int getMinorVersion() {
String[] c = getVersion().split("\\.");
return (c.length > 1) ? Integer.parseInt(c[1]) : 0;
}
/**
* @return The version of the SQLite JDBC driver.
*/
public static String getVersion() {
URL versionFile = SQLiteJDBCLoader.class.getResource("/META-INF/maven/org.xerial/sqlite-jdbc/pom.properties");
if(versionFile == null) {
versionFile = SQLiteJDBCLoader.class.getResource("/META-INF/maven/org.xerial/sqlite-jdbc/VERSION");
}
String version = "unknown";
try {
if(versionFile != null) {
Properties versionData = new Properties();
versionData.load(versionFile.openStream());
version = versionData.getProperty("version", version);
version = version.trim().replaceAll("[^0-9\\.]", "");
}
} catch(IOException e) {
System.err.println(e);
}
return version;
}
}
