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/*
* Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.store.fs;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.net.URL;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.channels.NonWritableChannelException;
import java.util.ArrayList;
import java.util.List;
import org.h2.api.ErrorCode;
import org.h2.engine.SysProperties;
import org.h2.message.DbException;
import org.h2.util.IOUtils;
import org.h2.util.New;
/**
* This file system stores files on disk.
* This is the most common file system.
*/
public class FilePathDisk extends FilePath {
private static final String CLASSPATH_PREFIX = "classpath:";
@Override
public FilePathDisk getPath(String path) {
FilePathDisk p = new FilePathDisk();
p.name = translateFileName(path);
return p;
}
@Override
public long size() {
return new File(name).length();
}
/**
* Translate the file name to the native format. This will replace '\' with
* '/' and expand the home directory ('~').
*
* @param fileName the file name
* @return the native file name
*/
protected static String translateFileName(String fileName) {
fileName = fileName.replace('\\', '/');
if (fileName.startsWith("file:")) {
fileName = fileName.substring("file:".length());
}
return expandUserHomeDirectory(fileName);
}
/**
* Expand '~' to the user home directory. It is only be expanded if the '~'
* stands alone, or is followed by '/' or '\'.
*
* @param fileName the file name
* @return the native file name
*/
public static String expandUserHomeDirectory(String fileName) {
if (fileName.startsWith("~") && (fileName.length() == 1 ||
fileName.startsWith("~/"))) {
String userDir = SysProperties.USER_HOME;
fileName = userDir + fileName.substring(1);
}
return fileName;
}
@Override
public void moveTo(FilePath newName, boolean atomicReplace) {
File oldFile = new File(name);
File newFile = new File(newName.name);
if (oldFile.getAbsolutePath().equals(newFile.getAbsolutePath())) {
return;
}
if (!oldFile.exists()) {
throw DbException.get(ErrorCode.FILE_RENAME_FAILED_2,
name + " (not found)",
newName.name);
}
// Java 7: use java.nio.file.Files.move(Path source, Path target,
// CopyOption... options)
// with CopyOptions "REPLACE_EXISTING" and "ATOMIC_MOVE".
if (atomicReplace) {
boolean ok = oldFile.renameTo(newFile);
if (ok) {
return;
}
throw DbException.get(ErrorCode.FILE_RENAME_FAILED_2,
new String[]{name, newName.name});
}
if (newFile.exists()) {
throw DbException.get(ErrorCode.FILE_RENAME_FAILED_2,
new String[] { name, newName + " (exists)" });
}
for (int i = 0; i < SysProperties.MAX_FILE_RETRY; i++) {
IOUtils.trace("rename", name + " >" + newName, null);
boolean ok = oldFile.renameTo(newFile);
if (ok) {
return;
}
wait(i);
}
throw DbException.get(ErrorCode.FILE_RENAME_FAILED_2,
new String[]{name, newName.name});
}
private static void wait(int i) {
if (i == 8) {
System.gc();
}
try {
// sleep at most 256 ms
long sleep = Math.min(256, i * i);
Thread.sleep(sleep);
} catch (InterruptedException e) {
// ignore
}
}
@Override
public boolean createFile() {
File file = new File(name);
for (int i = 0; i < SysProperties.MAX_FILE_RETRY; i++) {
try {
return file.createNewFile();
} catch (IOException e) {
// 'access denied' is really a concurrent access problem
wait(i);
}
}
return false;
}
@Override
public boolean exists() {
return new File(name).exists();
}
@Override
public void delete() {
File file = new File(name);
for (int i = 0; i < SysProperties.MAX_FILE_RETRY; i++) {
IOUtils.trace("delete", name, null);
boolean ok = file.delete();
if (ok || !file.exists()) {
return;
}
wait(i);
}
throw DbException.get(ErrorCode.FILE_DELETE_FAILED_1, name);
}
@Override
public List newDirectoryStream() {
ArrayList list = New.arrayList();
File f = new File(name);
try {
String[] files = f.list();
if (files != null) {
String base = f.getCanonicalPath();
if (!base.endsWith(SysProperties.FILE_SEPARATOR)) {
base += SysProperties.FILE_SEPARATOR;
}
for (int i = 0, len = files.length; i < len; i++) {
list.add(getPath(base + files[i]));
}
}
return list;
} catch (IOException e) {
throw DbException.convertIOException(e, name);
}
}
@Override
public boolean canWrite() {
return canWriteInternal(new File(name));
}
@Override
public boolean setReadOnly() {
File f = new File(name);
return f.setReadOnly();
}
@Override
public FilePathDisk toRealPath() {
try {
String fileName = new File(name).getCanonicalPath();
return getPath(fileName);
} catch (IOException e) {
throw DbException.convertIOException(e, name);
}
}
@Override
public FilePath getParent() {
String p = new File(name).getParent();
return p == null ? null : getPath(p);
}
@Override
public boolean isDirectory() {
return new File(name).isDirectory();
}
@Override
public boolean isAbsolute() {
return new File(name).isAbsolute();
}
@Override
public long lastModified() {
return new File(name).lastModified();
}
private static boolean canWriteInternal(File file) {
try {
if (!file.canWrite()) {
return false;
}
} catch (Exception e) {
// workaround for GAE which throws a
// java.security.AccessControlException
return false;
}
// File.canWrite() does not respect windows user permissions,
// so we must try to open it using the mode "rw".
// See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4420020
RandomAccessFile r = null;
try {
r = new RandomAccessFile(file, "rw");
return true;
} catch (FileNotFoundException e) {
return false;
} finally {
if (r != null) {
try {
r.close();
} catch (IOException e) {
// ignore
}
}
}
}
@Override
public void createDirectory() {
File dir = new File(name);
for (int i = 0; i < SysProperties.MAX_FILE_RETRY; i++) {
if (dir.exists()) {
if (dir.isDirectory()) {
return;
}
throw DbException.get(ErrorCode.FILE_CREATION_FAILED_1,
name + " (a file with this name already exists)");
} else if (dir.mkdir()) {
return;
}
wait(i);
}
throw DbException.get(ErrorCode.FILE_CREATION_FAILED_1, name);
}
@Override
public OutputStream newOutputStream(boolean append) throws IOException {
try {
File file = new File(name);
File parent = file.getParentFile();
if (parent != null) {
FileUtils.createDirectories(parent.getAbsolutePath());
}
FileOutputStream out = new FileOutputStream(name, append);
IOUtils.trace("openFileOutputStream", name, out);
return out;
} catch (IOException e) {
freeMemoryAndFinalize();
return new FileOutputStream(name);
}
}
@Override
public InputStream newInputStream() throws IOException {
int index = name.indexOf(':');
if (index > 1 && index < 20) {
// if the ':' is in position 1, a windows file access is assumed:
// C:.. or D:, and if the ':' is not at the beginning, assume its a
// file name with a colon
if (name.startsWith(CLASSPATH_PREFIX)) {
String fileName = name.substring(CLASSPATH_PREFIX.length());
if (!fileName.startsWith("/")) {
fileName = "/" + fileName;
}
InputStream in = getClass().getResourceAsStream(fileName);
if (in == null) {
in = Thread.currentThread().getContextClassLoader().
getResourceAsStream(fileName);
}
if (in == null) {
throw new FileNotFoundException("resource " + fileName);
}
return in;
}
// otherwise an URL is assumed
URL url = new URL(name);
InputStream in = url.openStream();
return in;
}
FileInputStream in = new FileInputStream(name);
IOUtils.trace("openFileInputStream", name, in);
return in;
}
/**
* Call the garbage collection and run finalization. This close all files
* that were not closed, and are no longer referenced.
*/
static void freeMemoryAndFinalize() {
IOUtils.trace("freeMemoryAndFinalize", null, null);
Runtime rt = Runtime.getRuntime();
long mem = rt.freeMemory();
for (int i = 0; i < 16; i++) {
rt.gc();
long now = rt.freeMemory();
rt.runFinalization();
if (now == mem) {
break;
}
mem = now;
}
}
@Override
public FileChannel open(String mode) throws IOException {
FileDisk f;
try {
f = new FileDisk(name, mode);
IOUtils.trace("open", name, f);
} catch (IOException e) {
freeMemoryAndFinalize();
try {
f = new FileDisk(name, mode);
} catch (IOException e2) {
throw e;
}
}
return f;
}
@Override
public String getScheme() {
return "file";
}
@Override
public FilePath createTempFile(String suffix, boolean deleteOnExit,
boolean inTempDir) throws IOException {
String fileName = name + ".";
String prefix = new File(fileName).getName();
File dir;
if (inTempDir) {
dir = new File(System.getProperty("java.io.tmpdir", "."));
} else {
dir = new File(fileName).getAbsoluteFile().getParentFile();
}
FileUtils.createDirectories(dir.getAbsolutePath());
while (true) {
File f = new File(dir, prefix + getNextTempFileNamePart(false) + suffix);
if (f.exists() || !f.createNewFile()) {
// in theory, the random number could collide
getNextTempFileNamePart(true);
continue;
}
if (deleteOnExit) {
try {
f.deleteOnExit();
} catch (Throwable e) {
// sometimes this throws a NullPointerException
// at java.io.DeleteOnExitHook.add(DeleteOnExitHook.java:33)
// we can ignore it
}
}
return get(f.getCanonicalPath());
}
}
}
/**
* Uses java.io.RandomAccessFile to access a file.
*/
class FileDisk extends FileBase {
private final RandomAccessFile file;
private final String name;
private final boolean readOnly;
FileDisk(String fileName, String mode) throws FileNotFoundException {
this.file = new RandomAccessFile(fileName, mode);
this.name = fileName;
this.readOnly = mode.equals("r");
}
@Override
public void force(boolean metaData) throws IOException {
String m = SysProperties.SYNC_METHOD;
if ("".equals(m)) {
// do nothing
} else if ("sync".equals(m)) {
file.getFD().sync();
} else if ("force".equals(m)) {
file.getChannel().force(true);
} else if ("forceFalse".equals(m)) {
file.getChannel().force(false);
} else {
file.getFD().sync();
}
}
@Override
public FileChannel truncate(long newLength) throws IOException {
// compatibility with JDK FileChannel#truncate
if (readOnly) {
throw new NonWritableChannelException();
}
if (newLength < file.length()) {
file.setLength(newLength);
}
return this;
}
@Override
public synchronized FileLock tryLock(long position, long size,
boolean shared) throws IOException {
return file.getChannel().tryLock(position, size, shared);
}
@Override
public void implCloseChannel() throws IOException {
file.close();
}
@Override
public long position() throws IOException {
return file.getFilePointer();
}
@Override
public long size() throws IOException {
return file.length();
}
@Override
public int read(ByteBuffer dst) throws IOException {
int len = file.read(dst.array(), dst.arrayOffset() + dst.position(),
dst.remaining());
if (len > 0) {
dst.position(dst.position() + len);
}
return len;
}
@Override
public FileChannel position(long pos) throws IOException {
file.seek(pos);
return this;
}
@Override
public int write(ByteBuffer src) throws IOException {
int len = src.remaining();
file.write(src.array(), src.arrayOffset() + src.position(), len);
src.position(src.position() + len);
return len;
}
@Override
public String toString() {
return name;
}
}
