org.hsqldb.jdbc.JDBCBlobClient Maven / Gradle / Ivy
/* Copyright (c) 2001-2011, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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package org.hsqldb.jdbc;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.SQLException;
import org.hsqldb.HsqlException;
import org.hsqldb.SessionInterface;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.types.BlobDataID;
import org.hsqldb.types.BlobInputStream;
/**
* A wrapper for HSQLDB BlobData objects.
*
* Instances of this class are returnd by calls to ResultSet methods.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.2.6
* @since 1.9.0
*/
public class JDBCBlobClient implements Blob {
/**
* Returns the number of bytes in the BLOB value designated
* by this Blob object.
*
* @return length of the BLOB in bytes
* @throws SQLException if there is an error accessing the length of the
* BLOB
*/
public synchronized long length() throws SQLException {
try {
return blob.length(session);
} catch (HsqlException e) {
throw JDBCUtil.sqlException(e);
}
}
/**
* Retrieves all or part of the BLOB value that this
* Blob object represents, as an array of bytes.
*
* @param pos the ordinal position of the first byte in the
* BLOB value to be extracted; the first byte is at
* position 1
* @param length the number of consecutive bytes to be copied
* @return a byte array containing up to length consecutive
* bytes from the BLOB value designated by this
* Blob object, starting with the byte at position
* pos
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized byte[] getBytes(long pos,
int length) throws SQLException {
if (!isInLimits(Long.MAX_VALUE, pos - 1, length)) {
throw JDBCUtil.outOfRangeArgument();
}
try {
return blob.getBytes(session, pos - 1, length);
} catch (HsqlException e) {
throw JDBCUtil.sqlException(e);
}
}
/**
* Retrieves the BLOB value designated by this
* Blob instance as a stream.
*
* @return a stream containing the BLOB data
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized InputStream getBinaryStream() throws SQLException {
return new BlobInputStream(session, blob, 0, length());
}
/**
* Retrieves the byte position at which the specified byte array
* pattern begins within the BLOB value that
* this Blob object represents.
*
* @param pattern the byte array for which to search
* @param start the position at which to begin searching; the first
* position is 1
* @return the position at which the pattern appears, else -1
* @throws SQLException if there is an error accessing the
* BLOB
*/
public synchronized long position(byte[] pattern,
long start) throws SQLException {
if (!isInLimits(Long.MAX_VALUE, start - 1, 0)) {
throw JDBCUtil.outOfRangeArgument();
}
try {
long position = blob.position(session, pattern, start - 1);
if (position >= 0) {
position++;
}
return position;
} catch (HsqlException e) {
throw JDBCUtil.sqlException(e);
}
}
/**
* Retrieves the byte position in the BLOB value designated
* by this Blob object at which pattern begins.
*
* @param pattern the Blob object designating the
* BLOB value for which to search
* @param start the position in the BLOB value at which to
* begin searching; the first position is 1
* @return the position at which the pattern begins, else -1
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized long position(Blob pattern,
long start) throws SQLException {
if (!isInLimits(Long.MAX_VALUE, start - 1, 0)) {
throw JDBCUtil.outOfRangeArgument();
}
if (pattern instanceof JDBCBlobClient) {
BlobDataID searchClob = ((JDBCBlobClient) pattern).blob;
try {
long position = blob.position(session, searchClob, start - 1);
if (position >= 0) {
position++;
}
return position;
} catch (HsqlException e) {
throw JDBCUtil.sqlException(e);
}
}
if (!isInLimits(Integer.MAX_VALUE, 0, pattern.length())) {
throw JDBCUtil.outOfRangeArgument();
}
byte[] bytePattern = pattern.getBytes(1, (int) pattern.length());
return position(bytePattern, start);
}
/**
* Writes the given array of bytes to the BLOB value that
* this Blob object represents, starting at position
* pos, and returns the number of bytes written.
*
* @param pos the position in the BLOB object at which to
* start writing
* @param bytes the array of bytes to be written to the
* BLOB value that this Blob object
* represents
* @return the number of bytes written
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized int setBytes(long pos,
byte[] bytes) throws SQLException {
return setBytes(pos, bytes, 0, bytes.length);
}
/**
* Writes all or part of the given byte array to the
* BLOB value that this Blob object represents
* and returns the number of bytes written.
*
* @param pos the position in the BLOB object at which to
* start writing
* @param bytes the array of bytes to be written to this
* BLOB object
* @param offset the offset into the array bytes at which
* to start reading the bytes to be set
* @param len the number of bytes to be written to the BLOB
* value from the array of bytes bytes
* @return the number of bytes written
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized int setBytes(long pos, byte[] bytes, int offset,
int len) throws SQLException {
if (!isInLimits(bytes.length, offset, len)) {
throw JDBCUtil.outOfRangeArgument();
}
if (!isInLimits(Long.MAX_VALUE, pos - 1, len)) {
throw JDBCUtil.outOfRangeArgument();
}
if (!isWritable) {
throw JDBCUtil.notUpdatableColumn();
}
startUpdate();
try {
blob.setBytes(session, pos - 1, bytes, offset, len);
return len;
} catch (HsqlException e) {
throw JDBCUtil.sqlException(e);
}
}
/**
* Retrieves a stream that can be used to write to the BLOB
* value that this Blob object represents.
*
* @param pos the position in the BLOB value at which to
* start writing
* @return a java.io.OutputStream object to which data can
* be written
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized OutputStream setBinaryStream(long pos)
throws SQLException {
throw JDBCUtil.notSupported();
}
/**
* Truncates the BLOB value that this Blob
* object represents to be len bytes in length.
*
* @param len the length, in bytes, to which the BLOB value
* that this Blob object represents should be truncated
* @throws SQLException if there is an error accessing the
* BLOB value
*/
public synchronized void truncate(long len) throws SQLException {
try {
blob.truncate(session, len);
} catch (HsqlException e) {
throw JDBCUtil.sqlException(e);
}
}
/**
* This method frees the Blob object and releases the resources that
* it holds. The object is invalid once the free
* method is called.
*
* After free has been called, any attempt to invoke a
* method other than free will result in a SQLException
* being thrown. If free is called multiple times, the subsequent
* calls to free are treated as a no-op.
*
*
* @throws SQLException if an error occurs releasing
* the Blob's resources
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @since JDK 1.6, HSQLDB 2.0
*/
public synchronized void free() throws SQLException {
isClosed = true;
}
/**
* Returns an InputStream object that contains a partial Blob value,
* starting with the byte specified by pos, which is length bytes in length.
*
* @param pos the offset to the first byte of the partial value to be retrieved.
* The first byte in the Blob is at position 1
* @param length the length in bytes of the partial value to be retrieved
* @return InputStream through which the partial Blob value can be read.
* @throws SQLException if pos is less than 1 or if pos is greater than the number of bytes
* in the Blob or if pos + length is greater than the number of bytes
* in the Blob
*
* @exception SQLFeatureNotSupportedException if the JDBC driver does not support
* this method
* @since JDK 1.6, HSQLDB 2.0
*/
public synchronized InputStream getBinaryStream(long pos,
long length) throws SQLException {
if (!isInLimits(Long.MAX_VALUE, pos - 1, length)) {
throw JDBCUtil.outOfRangeArgument();
}
return new BlobInputStream(session, blob, pos - 1, length);
}
//--
BlobDataID originalBlob;
BlobDataID blob;
SessionInterface session;
int colIndex;
private boolean isClosed;
private boolean isWritable;
JDBCResultSet resultSet;
public JDBCBlobClient(SessionInterface session, BlobDataID blob) {
this.session = session;
this.blob = blob;
}
public boolean isClosed() {
return isClosed;
}
public BlobDataID getBlob() {
return blob;
}
public synchronized void setWritable(JDBCResultSet result, int index) {
isWritable = true;
resultSet = result;
colIndex = index;
}
public synchronized void clearUpdates() {
if (originalBlob != null) {
blob = originalBlob;
originalBlob = null;
}
}
private void startUpdate() throws SQLException {
if (originalBlob != null) {
return;
}
originalBlob = blob;
blob = (BlobDataID) blob.duplicate(session);
resultSet.startUpdate(colIndex + 1);
resultSet.preparedStatement.parameterValues[colIndex] = blob;
resultSet.preparedStatement.parameterSet[colIndex] = Boolean.TRUE;
}
private void checkClosed() throws SQLException {
if (isClosed) {
throw JDBCUtil.sqlException(ErrorCode.X_07501);
}
}
static boolean isInLimits(long fullLength, long pos, long len) {
return pos >= 0 && len >= 0 && pos + len <= fullLength;
}
}