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PostgreSQL JDBC - NG - Driver
/**
* Copyright (c) 2013, impossibl.com
* 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 impossibl.com 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
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package com.impossibl.postgres.jdbc;
import com.impossibl.postgres.utils.guava.ByteStreams;
import com.impossibl.postgres.utils.guava.CharStreams;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.RowId;
import java.sql.SQLException;
import java.sql.SQLXML;
class Unwrapping {
static Object unwrapObject(PGDirectConnection connection, Object x) throws SQLException {
if (x instanceof Blob) {
return unwrapBlob(connection, (Blob) x);
}
if (x instanceof Clob) {
return unwrapClob(connection, (Clob) x);
}
if (x instanceof RowId) {
return unwrapRowId((RowId) x);
}
if (x instanceof SQLXML) {
return unwrapXML((SQLXML) x);
}
return x;
}
static PGSQLXML unwrapXML(SQLXML x) throws SQLException {
if (x == null) {
return null;
}
if (!(x instanceof PGSQLXML)) {
throw new SQLException("SQLXML is from a different provider");
}
PGSQLXML xml = (PGSQLXML) x;
if (xml.isNull()) {
return null;
}
return xml;
}
static PGRowId unwrapRowId(RowId x) throws SQLException {
if (x == null) {
return null;
}
if (x instanceof PGRowId) {
return (PGRowId) x;
}
throw new SQLException("RowId is from a different provider");
}
static PGBlob unwrapBlob(PGDirectConnection connection, Blob x) throws SQLException {
if (x == null) {
return null;
}
if (x instanceof PGBlob) {
return (PGBlob) x;
}
InputStream in = x.getBinaryStream();
if (in instanceof BlobInputStream) {
return new PGBlob(connection, ((BlobInputStream) in).lo.oid);
}
PGBlob nx = (PGBlob) connection.createBlob();
OutputStream out = nx.setBinaryStream(1);
try {
ByteStreams.copy(in, out);
in.close();
out.close();
}
catch (IOException e) {
throw new SQLException(e);
}
return nx;
}
static PGClob unwrapClob(PGDirectConnection connection, Clob x) throws SQLException {
if (x == null) {
return null;
}
if (x instanceof PGClob)
return (PGClob) x;
Reader in = x.getCharacterStream();
if (in instanceof ClobReader) {
return new PGClob(connection, ((ClobReader) in).lo.oid);
}
PGClob nx = (PGClob) connection.createClob();
Writer out = nx.setCharacterStream(1);
try {
CharStreams.copy(in, out);
in.close();
out.close();
}
catch (IOException e) {
throw new SQLException(e);
}
return nx;
}
}