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org.h2.value.ValueLobDb Maven / Gradle / Ivy
/*
* 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.value;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.h2.engine.Constants;
import org.h2.engine.SysProperties;
import org.h2.message.DbException;
import org.h2.mvstore.DataUtils;
import org.h2.store.DataHandler;
import org.h2.store.FileStore;
import org.h2.store.FileStoreInputStream;
import org.h2.store.FileStoreOutputStream;
import org.h2.store.LobStorageFrontend;
import org.h2.store.LobStorageInterface;
import org.h2.store.fs.FileUtils;
import org.h2.util.IOUtils;
import org.h2.util.MathUtils;
import org.h2.util.StringUtils;
import org.h2.util.Utils;
/**
* A implementation of the BLOB and CLOB data types.
*
* Small objects are kept in memory and stored in the record.
* Large objects are either stored in the database, or in temporary files.
*/
public class ValueLobDb extends Value implements Value.ValueClob,
Value.ValueBlob {
private final int type;
private final long lobId;
private final byte[] hmac;
private final byte[] small;
private final DataHandler handler;
/**
* For a BLOB, precision is length in bytes.
* For a CLOB, precision is length in chars.
*/
private final long precision;
private final String fileName;
private final FileStore tempFile;
private int tableId;
private int hash;
private ValueLobDb(int type, DataHandler handler, int tableId, long lobId,
byte[] hmac, long precision) {
this.type = type;
this.handler = handler;
this.tableId = tableId;
this.lobId = lobId;
this.hmac = hmac;
this.precision = precision;
this.small = null;
this.fileName = null;
this.tempFile = null;
}
private ValueLobDb(int type, byte[] small, long precision) {
this.type = type;
this.small = small;
this.precision = precision;
this.lobId = 0;
this.hmac = null;
this.handler = null;
this.fileName = null;
this.tempFile = null;
}
/**
* Create a CLOB in a temporary file.
*/
private ValueLobDb(DataHandler handler, Reader in, long remaining)
throws IOException {
this.type = Value.CLOB;
this.handler = handler;
this.small = null;
this.lobId = 0;
this.hmac = null;
this.fileName = createTempLobFileName(handler);
this.tempFile = this.handler.openFile(fileName, "rw", false);
this.tempFile.autoDelete();
FileStoreOutputStream out = new FileStoreOutputStream(tempFile, null, null);
long tmpPrecision = 0;
try {
char[] buff = new char[Constants.IO_BUFFER_SIZE];
while (true) {
int len = getBufferSize(this.handler, false, remaining);
len = IOUtils.readFully(in, buff, len);
if (len == 0) {
break;
}
byte[] data = new String(buff, 0, len).getBytes("UTF-8");
out.write(data);
tmpPrecision += len;
}
} finally {
out.close();
}
this.precision = tmpPrecision;
}
/**
* Create a BLOB in a temporary file.
*/
private ValueLobDb(DataHandler handler, byte[] buff, int len, InputStream in,
long remaining) throws IOException {
this.type = Value.BLOB;
this.handler = handler;
this.small = null;
this.lobId = 0;
this.hmac = null;
this.fileName = createTempLobFileName(handler);
this.tempFile = this.handler.openFile(fileName, "rw", false);
this.tempFile.autoDelete();
FileStoreOutputStream out = new FileStoreOutputStream(tempFile, null, null);
long tmpPrecision = 0;
boolean compress = this.handler.getLobCompressionAlgorithm(Value.BLOB) != null;
try {
while (true) {
tmpPrecision += len;
out.write(buff, 0, len);
remaining -= len;
if (remaining <= 0) {
break;
}
len = getBufferSize(this.handler, compress, remaining);
len = IOUtils.readFully(in, buff, len);
if (len <= 0) {
break;
}
}
} finally {
out.close();
}
this.precision = tmpPrecision;
}
private static String createTempLobFileName(DataHandler handler)
throws IOException {
String path = handler.getDatabasePath();
if (path.length() == 0) {
path = SysProperties.PREFIX_TEMP_FILE;
}
return FileUtils.createTempFile(path, Constants.SUFFIX_TEMP_FILE, true, true);
}
/**
* Create a LOB value.
*
* @param type the type
* @param handler the data handler
* @param tableId the table id
* @param id the lob id
* @param hmac the message authentication code
* @param precision the precision (number of bytes / characters)
* @return the value
*/
public static ValueLobDb create(int type, DataHandler handler,
int tableId, long id, byte[] hmac, long precision) {
return new ValueLobDb(type, handler, tableId, id, hmac, precision);
}
/**
* Convert a lob to another data type. The data is fully read in memory
* except when converting to BLOB or CLOB.
*
* @param t the new type
* @return the converted value
*/
@Override
public Value convertTo(int t) {
if (t == type) {
return this;
} else if (t == Value.CLOB) {
if (handler != null) {
Value copy = handler.getLobStorage().
createClob(getReader(), -1);
return copy;
} else if (small != null) {
return ValueLobDb.createSmallLob(t, small);
}
} else if (t == Value.BLOB) {
if (handler != null) {
Value copy = handler.getLobStorage().
createBlob(getInputStream(), -1);
return copy;
} else if (small != null) {
return ValueLobDb.createSmallLob(t, small);
}
}
return super.convertTo(t);
}
@Override
public boolean isLinked() {
return tableId != LobStorageFrontend.TABLE_ID_SESSION_VARIABLE &&
tableId != LobStorageFrontend.TABLE_RESULT &&
small == null;
}
public boolean isStored() {
return small == null && fileName == null;
}
@Override
public void close() {
if (fileName != null) {
if (tempFile != null) {
tempFile.stopAutoDelete();
}
// synchronize on the database, to avoid concurrent temp file
// creation / deletion / backup
synchronized (handler.getLobSyncObject()) {
FileUtils.delete(fileName);
}
}
if (handler != null) {
handler.getLobStorage().removeLob(this);
}
}
@Override
public void unlink(DataHandler database) {
if (small == null &&
tableId != LobStorageFrontend.TABLE_ID_SESSION_VARIABLE) {
database.getLobStorage().setTable(this,
LobStorageFrontend.TABLE_ID_SESSION_VARIABLE);
tableId = LobStorageFrontend.TABLE_ID_SESSION_VARIABLE;
}
}
@Override
public Value link(DataHandler database, int tabId) {
if (small == null) {
if (tableId == LobStorageFrontend.TABLE_TEMP) {
database.getLobStorage().setTable(this, tabId);
this.tableId = tabId;
} else {
return handler.getLobStorage().copyLob(this, tabId, getPrecision());
}
} else if (small.length > database.getMaxLengthInplaceLob()) {
LobStorageInterface s = database.getLobStorage();
Value v;
if (type == Value.BLOB) {
v = s.createBlob(getInputStream(), getPrecision());
} else {
v = s.createClob(getReader(), getPrecision());
}
return v.link(database, tabId);
}
return this;
}
/**
* Get the current table id of this lob.
*
* @return the table id
*/
@Override
public int getTableId() {
return tableId;
}
@Override
public int getType() {
return type;
}
@Override
public long getPrecision() {
return precision;
}
@Override
public String getString() {
int len = precision > Integer.MAX_VALUE || precision == 0 ?
Integer.MAX_VALUE : (int) precision;
try {
if (type == Value.CLOB) {
if (small != null) {
return new String(small, Constants.UTF8);
}
return IOUtils.readStringAndClose(getReader(), len);
}
byte[] buff;
if (small != null) {
buff = small;
} else {
buff = IOUtils.readBytesAndClose(getInputStream(), len);
}
return StringUtils.convertBytesToHex(buff);
} catch (IOException e) {
throw DbException.convertIOException(e, toString());
}
}
@Override
public byte[] getBytes() {
if (type == CLOB) {
// convert hex to string
return super.getBytes();
}
byte[] data = getBytesNoCopy();
return Utils.cloneByteArray(data);
}
@Override
public byte[] getBytesNoCopy() {
if (type == CLOB) {
// convert hex to string
return super.getBytesNoCopy();
}
if (small != null) {
return small;
}
try {
return IOUtils.readBytesAndClose(getInputStream(), Integer.MAX_VALUE);
} catch (IOException e) {
throw DbException.convertIOException(e, toString());
}
}
@Override
public int hashCode() {
if (hash == 0) {
if (precision > 4096) {
// TODO: should calculate the hash code when saving, and store
// it in the database file
return (int) (precision ^ (precision >>> 32));
}
if (type == CLOB) {
hash = getString().hashCode();
} else {
hash = Utils.getByteArrayHash(getBytes());
}
}
return hash;
}
@Override
protected int compareSecure(Value v, CompareMode mode) {
if (v instanceof ValueLobDb) {
ValueLobDb v2 = (ValueLobDb) v;
if (v == this) {
return 0;
}
if (lobId == v2.lobId && small == null && v2.small == null) {
return 0;
}
}
if (type == Value.CLOB) {
return Integer.signum(getString().compareTo(v.getString()));
}
byte[] v2 = v.getBytesNoCopy();
return Utils.compareNotNullSigned(getBytes(), v2);
}
@Override
public Object getObject() {
if (type == Value.CLOB) {
return getReader();
}
return getInputStream();
}
@Override
public Reader getReader() {
return IOUtils.getBufferedReader(getInputStream());
}
@Override
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;
try {
return handler.getLobStorage().getInputStream(this, hmac, byteCount);
} catch (IOException e) {
throw DbException.convertIOException(e, toString());
}
}
@Override
public void set(PreparedStatement prep, int parameterIndex)
throws SQLException {
long p = getPrecision();
if (p > Integer.MAX_VALUE || p <= 0) {
p = -1;
}
if (type == Value.BLOB) {
prep.setBinaryStream(parameterIndex, getInputStream(), (int) p);
} else {
prep.setCharacterStream(parameterIndex, getReader(), (int) p);
}
}
@Override
public String getSQL() {
String s;
if (type == Value.CLOB) {
s = getString();
return StringUtils.quoteStringSQL(s);
}
byte[] buff = getBytes();
s = StringUtils.convertBytesToHex(buff);
return "X'" + s + "'";
}
@Override
public String getTraceSQL() {
if (small != null && getPrecision() <= SysProperties.MAX_TRACE_DATA_LENGTH) {
return getSQL();
}
StringBuilder buff = new StringBuilder();
if (type == Value.CLOB) {
buff.append("SPACE(").append(getPrecision());
} else {
buff.append("CAST(REPEAT('00', ").append(getPrecision()).append(") AS BINARY");
}
buff.append(" /* table: ").append(tableId).append(" id: ")
.append(lobId).append(" */)");
return buff.toString();
}
/**
* Get the data if this a small lob value.
*
* @return the data
*/
@Override
public byte[] getSmall() {
return small;
}
@Override
public int getDisplaySize() {
return MathUtils.convertLongToInt(getPrecision());
}
@Override
public boolean equals(Object other) {
return other instanceof ValueLobDb && compareSecure((Value) other, null) == 0;
}
@Override
public int getMemory() {
if (small != null) {
return small.length + 104;
}
return 140;
}
/**
* Create an independent copy of this temporary value.
* The file will not be deleted automatically.
*
* @return the value
*/
@Override
public ValueLobDb copyToTemp() {
return this;
}
/**
* Create an independent copy of this value,
* that will be bound to a result.
*
* @return the value (this for small objects)
*/
@Override
public ValueLobDb copyToResult() {
if (handler == null) {
return this;
}
LobStorageInterface s = handler.getLobStorage();
if (s.isReadOnly()) {
return this;
}
return s.copyLob(this, LobStorageFrontend.TABLE_RESULT,
getPrecision());
}
public long getLobId() {
return lobId;
}
@Override
public String toString() {
return "lob: " + fileName + " table: " + tableId + " id: " + lobId;
}
/**
* Create a temporary CLOB value from a stream.
*
* @param in the reader
* @param length the number of characters to read, or -1 for no limit
* @param handler the data handler
* @return the lob value
*/
public static ValueLobDb createTempClob(Reader in, long length,
DataHandler handler) {
BufferedReader reader;
if (in instanceof BufferedReader) {
reader = (BufferedReader) in;
} else {
reader = new BufferedReader(in, Constants.IO_BUFFER_SIZE);
}
try {
boolean compress = handler.getLobCompressionAlgorithm(Value.CLOB) != null;
long remaining = Long.MAX_VALUE;
if (length >= 0 && length < remaining) {
remaining = length;
}
int len = getBufferSize(handler, compress, remaining);
char[] buff;
if (len >= Integer.MAX_VALUE) {
String data = IOUtils.readStringAndClose(reader, -1);
buff = data.toCharArray();
len = buff.length;
} else {
buff = new char[len];
reader.mark(len);
len = IOUtils.readFully(reader, buff, len);
}
if (len <= handler.getMaxLengthInplaceLob()) {
byte[] small = new String(buff, 0, len).getBytes(Constants.UTF8);
return ValueLobDb.createSmallLob(Value.CLOB, small, len);
}
reader.reset();
ValueLobDb lob = new ValueLobDb(handler, reader, remaining);
return lob;
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
}
/**
* Create a temporary BLOB value from a stream.
*
* @param in the input stream
* @param length the number of characters to read, or -1 for no limit
* @param handler the data handler
* @return the lob value
*/
public static ValueLobDb createTempBlob(InputStream in, long length,
DataHandler handler) {
try {
long remaining = Long.MAX_VALUE;
boolean compress = handler.getLobCompressionAlgorithm(Value.BLOB) != null;
if (length >= 0 && length < remaining) {
remaining = length;
}
int len = getBufferSize(handler, compress, remaining);
byte[] buff;
if (len >= Integer.MAX_VALUE) {
buff = IOUtils.readBytesAndClose(in, -1);
len = buff.length;
} else {
buff = DataUtils.newBytes(len);
len = IOUtils.readFully(in, buff, len);
}
if (len <= handler.getMaxLengthInplaceLob()) {
byte[] small = DataUtils.newBytes(len);
System.arraycopy(buff, 0, small, 0, len);
return ValueLobDb.createSmallLob(Value.BLOB, small, small.length);
}
ValueLobDb lob = new ValueLobDb(handler, buff, len, in, remaining);
return lob;
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
}
private static int getBufferSize(DataHandler handler, boolean compress,
long remaining) {
if (remaining < 0 || remaining > Integer.MAX_VALUE) {
remaining = Integer.MAX_VALUE;
}
int inplace = handler.getMaxLengthInplaceLob();
long m = compress ? Constants.IO_BUFFER_SIZE_COMPRESS
: Constants.IO_BUFFER_SIZE;
if (m < remaining && m <= inplace) {
// using "1L" to force long arithmetic because
// inplace could be Integer.MAX_VALUE
m = Math.min(remaining, inplace + 1L);
// the buffer size must be bigger than the inplace lob, otherwise we
// can't know if it must be stored in-place or not
m = MathUtils.roundUpLong(m, Constants.IO_BUFFER_SIZE);
}
m = Math.min(remaining, m);
m = MathUtils.convertLongToInt(m);
if (m < 0) {
m = Integer.MAX_VALUE;
}
return (int) m;
}
@Override
public Value convertPrecision(long precision, boolean force) {
if (this.precision <= precision) {
return this;
}
ValueLobDb lob;
if (type == CLOB) {
if (handler == null) {
try {
int p = MathUtils.convertLongToInt(precision);
String s = IOUtils.readStringAndClose(getReader(), p);
byte[] data = s.getBytes(Constants.UTF8);
lob = ValueLobDb.createSmallLob(type, data, s.length());
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
} else {
lob = ValueLobDb.createTempClob(getReader(), precision, handler);
}
} else {
if (handler == null) {
try {
int p = MathUtils.convertLongToInt(precision);
byte[] data = IOUtils.readBytesAndClose(getInputStream(), p);
lob = ValueLobDb.createSmallLob(type, data, data.length);
} catch (IOException e) {
throw DbException.convertIOException(e, null);
}
} else {
lob = ValueLobDb.createTempBlob(getInputStream(), precision, handler);
}
}
return lob;
}
/**
* Create a LOB object that fits in memory.
*
* @param type the type (Value.BLOB or CLOB)
* @param small the byte array
* @return the LOB
*/
public static Value createSmallLob(int type, byte[] small) {
int precision;
if (type == Value.CLOB) {
precision = new String(small, Constants.UTF8).length();
} else {
precision = small.length;
}
return createSmallLob(type, small, precision);
}
/**
* Create a LOB object that fits in memory.
*
* @param type the type (Value.BLOB or CLOB)
* @param small the byte array
* @param precision the precision
* @return the LOB
*/
public static ValueLobDb createSmallLob(int type, byte[] small,
long precision) {
return new ValueLobDb(type, small, precision);
}
}
