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JDBC Driver for the Firebird RDBMS
/*
* Firebird Open Source JavaEE Connector - JDBC Driver
*
* Distributable under LGPL license.
* You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* LGPL License for more details.
*
* This file was created by members of the firebird development team.
* All individual contributions remain the Copyright (C) of those
* individuals. Contributors to this file are either listed here or
* can be obtained from a source control history command.
*
* All rights reserved.
*/
package org.firebirdsql.jdbc.field;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.sql.Clob;
import java.sql.NClob;
import java.sql.SQLException;
import org.firebirdsql.jdbc.FBCachedBlob;
import org.firebirdsql.jdbc.FBDriverNotCapableException;
import org.firebirdsql.jdbc.FBSQLException;
/**
* Clob implementation that is cached client-side.
*
* This implementation is used for disconnected result sets (ie scrollable and hold cursors over commit).
*
*
* This class also implements {@link NClob} so it can be used with the {@code set/get/updateNClob} methods
* transparently. It technically does not conform to the JDBC requirements for {@code NClob}.
*
*/
public class FBCachedClob implements Clob, NClob {
private FBCachedBlob wrappedBlob;
private String javaEncoding;
public FBCachedClob(FBCachedBlob blob, String javaEncoding) {
this.wrappedBlob = blob;
this.javaEncoding = javaEncoding;
}
public void free() throws SQLException {
wrappedBlob.free();
}
public InputStream getAsciiStream() throws SQLException {
return wrappedBlob.getBinaryStream();
}
public Reader getCharacterStream() throws SQLException {
InputStream inputStream = wrappedBlob.getBinaryStream();
if (javaEncoding == null) {
return new InputStreamReader(inputStream);
} else {
try {
return new InputStreamReader(wrappedBlob.getBinaryStream(),
javaEncoding);
} catch (IOException ioe) {
throw new FBSQLException(ioe);
}
}
}
public Reader getCharacterStream(long pos, long length) throws SQLException {
InputStream inputStream = wrappedBlob.getBinaryStream(pos, length);
if (javaEncoding == null) {
return new InputStreamReader(inputStream);
} else {
try {
return new InputStreamReader(inputStream, javaEncoding);
} catch (IOException ioe) {
throw new FBSQLException(ioe);
}
}
}
public String getSubString(long pos, int length) throws SQLException {
throw new FBDriverNotCapableException("Method getSubstring(long, int) is not supported");
}
public long length() throws SQLException {
throw new FBDriverNotCapableException("Cannot determine length for CLOB");
}
public long position(String searchstr, long start) throws SQLException {
throw new FBDriverNotCapableException("Method position(String, long) is not supported");
}
public long position(Clob searchstr, long start) throws SQLException {
throw new FBDriverNotCapableException("Method position(Clob, long) is not supported");
}
public OutputStream setAsciiStream(long pos) throws SQLException {
throw new FBSQLException("Clob in auto-commit mode is read-only.");
}
public Writer setCharacterStream(long pos) throws SQLException {
throw new FBSQLException("Clob in auto-commit mode is read-only.");
}
public int setString(long pos, String str) throws SQLException {
throw new FBSQLException("Clob in auto-commit mode is read-only.");
}
public int setString(long pos, String str, int offset, int len)
throws SQLException {
throw new FBSQLException("Clob in auto-commit mode is read-only.");
}
public void truncate(long len) throws SQLException {
wrappedBlob.truncate(len);
}
}
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