Examples of org.h2.store.FileStore

org.h2.store.FileStore
This class is an abstraction of a random access file. Each file contains a magic header, and reading / writing is done in blocks. See also {@link SecureFileStore}

            String charset) throws IOException {
        try {
            InputStream in;
            if (cipher != null) {
                byte[] key = SHA256.getKeyPasswordHash("script", password.toCharArray());
                FileStore store = FileStore.open(null, fileName, "rw", cipher, key);
                store.init();
                in = new FileStoreInputStream(store, null, compressionAlgorithm != null, false);
                in = new BufferedInputStream(in, Constants.IO_BUFFER_SIZE_COMPRESS);
            } else {
                in = IOUtils.openFileInputStream(fileName);
                in = new BufferedInputStream(in, Constants.IO_BUFFER_SIZE);

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    public FileStore openFile(String name, String openMode, boolean mustExist) {
        if (mustExist && !FileUtils.exists(name)) {
            throw DbException.get(ErrorCode.FILE_NOT_FOUND_1, name);
        }
        FileStore store = FileStore.open(this, name, openMode, cipher, filePasswordHash);
        try {
            store.init();
        } catch (DbException e) {
            store.closeSilently();
            throw e;
        }
        return store;
    }

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    public FileStore openFile(String name, String mode, boolean mustExist) {
        if (mustExist && !FileUtils.exists(name)) {
            throw DbException.get(ErrorCode.FILE_NOT_FOUND_1, name);
        }
        FileStore store;
        if (cipher == null) {
            store = FileStore.open(this, name, mode);
        } else {
            store = FileStore.open(this, name, mode, cipher, fileEncryptionKey, 0);
        }
        store.setCheckedWriting(false);
        try {
            store.init();
        } catch (DbException e) {
            store.closeSilently();
            throw e;
        }
        return store;
    }

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    public InputStream getInputStream() {
        if (fileName == null) {
            return new ByteArrayInputStream(small);
        }
        FileStore store = handler.openFile(fileName, "r", true);
        boolean alwaysClose = SysProperties.lobCloseBetweenReads;
        return new BufferedInputStream(new FileStoreInputStream(store, handler, compression, alwaysClose),
                Constants.IO_BUFFER_SIZE);
    }

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        writer.println("-- dump: " + sb.toString());
    }


    private void dumpLob(String fileName, boolean lobCompression) {
        OutputStream fileOut = null;
        FileStore fileStore = null;
        long size = 0;
        String n = fileName + (lobCompression ? ".comp" : "") + ".txt";
        InputStream in = null;
        try {
            fileOut = FileUtils.newOutputStream(n, false);
            fileStore = FileStore.open(null, fileName, "r");
            fileStore.init();
            in = new FileStoreInputStream(fileStore, this, lobCompression, false);
            size = IOUtils.copy(in, fileOut);
        } catch (Throwable e) {
            // this is usually not a problem, because we try both compressed and
            // uncompressed

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            }
        }
    }


    private void process(String fileName) {
        FileStore in;
        if (decrypt == null) {
            in = FileStore.open(null, fileName, "r");
        } else {
            in = FileStore.open(null, fileName, "r", cipherType, decrypt);
        }
        in.init();
        copy(fileName, in, encrypt);
    }

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        if (FileUtils.isDirectory(fileName)) {
            return;
        }
        String temp = directory + "/temp.db";
        FileUtils.delete(temp);
        FileStore fileOut;
        if (key == null) {
            fileOut = FileStore.open(null, temp, "rw");
        } else {
            fileOut = FileStore.open(null, temp, "rw", cipherType, key);
        }
        fileOut.init();
        byte[] buffer = new byte[4 * 1024];
        long remaining = in.length() - FileStore.HEADER_LENGTH;
        long total = remaining;
        in.seek(FileStore.HEADER_LENGTH);
        fileOut.seek(FileStore.HEADER_LENGTH);
        long time = System.currentTimeMillis();
        while (remaining > 0) {
            if (System.currentTimeMillis() - time > 1000) {
                out.println(fileName + ": " + (100 - 100 * remaining / total) + "%");
                time = System.currentTimeMillis();
            }
            int len = (int) Math.min(buffer.length, remaining);
            in.readFully(buffer, 0, len);
            fileOut.write(buffer, 0, len);
            remaining -= len;
        }
        in.close();
        fileOut.close();
        FileUtils.delete(fileName);
        FileUtils.moveTo(temp, fileName);
    }

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    public InputStream getInputStream() {
        if (small != null) {
            return new ByteArrayInputStream(small);
        } else if (fileName != null) {
            FileStore store = handler.openFile(fileName, "r", true);
            boolean alwaysClose = SysProperties.lobCloseBetweenReads;
            return new BufferedInputStream(new FileStoreInputStream(store, handler, false, alwaysClose),
                    Constants.IO_BUFFER_SIZE);
        }
        long byteCount = (type == Value.BLOB) ? precision : -1;

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            }
        }
    }


    private void process(String fileName) {
        FileStore in;
        if (decrypt == null) {
            in = FileStore.open(null, fileName, "r");
        } else {
            in = FileStore.open(null, fileName, "r", cipherType, decrypt);
        }
        in.init();
        copy(fileName, in, encrypt);
    }

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        if (IOUtils.isDirectory(fileName)) {
            return;
        }
        String temp = directory + "/temp.db";
        IOUtils.delete(temp);
        FileStore fileOut;
        if (key == null) {
            fileOut = FileStore.open(null, temp, "rw");
        } else {
            fileOut = FileStore.open(null, temp, "rw", cipherType, key);
        }
        fileOut.init();
        byte[] buffer = new byte[4 * 1024];
        long remaining = in.length() - FileStore.HEADER_LENGTH;
        long total = remaining;
        in.seek(FileStore.HEADER_LENGTH);
        fileOut.seek(FileStore.HEADER_LENGTH);
        long time = System.currentTimeMillis();
        while (remaining > 0) {
            if (System.currentTimeMillis() - time > 1000) {
                out.println(fileName + ": " + (100 - 100 * remaining / total) + "%");
                time = System.currentTimeMillis();
            }
            int len = (int) Math.min(buffer.length, remaining);
            in.readFully(buffer, 0, len);
            fileOut.write(buffer, 0, len);
            remaining -= len;
        }
        in.close();
        fileOut.close();
        IOUtils.delete(fileName);
        IOUtils.rename(temp, fileName);
    }

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