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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.protocol.FieldBuffersRowData;
import com.impossibl.postgres.protocol.FieldFormat;
import com.impossibl.postgres.protocol.ResultField;
import com.impossibl.postgres.protocol.RowDataSet;
import com.impossibl.postgres.system.Context;
import com.impossibl.postgres.types.ArrayType;
import com.impossibl.postgres.types.NestedArrayType;
import com.impossibl.postgres.types.Registry;
import com.impossibl.postgres.types.Type;
import static com.impossibl.postgres.jdbc.ArrayUtils.getDimensions;
import static com.impossibl.postgres.jdbc.ArrayUtils.getElementType;
import static com.impossibl.postgres.system.CustomTypes.lookupCustomType;
import static com.impossibl.postgres.system.Empty.EMPTY_BUFFERS;
import static com.impossibl.postgres.system.procs.Arrays.strideOfDimensions;
import static com.impossibl.postgres.utils.Types.boxType;
import java.io.IOException;
import java.lang.reflect.Array;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.Arrays.copyOfRange;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufUtil;
import io.netty.buffer.CompositeByteBuf;
import io.netty.util.ReferenceCountUtil;
public class PGBuffersArray extends PGArray {
private FieldFormat elementFormat;
private ByteBuf[] elementBuffers;
private int[] dimensions;
private Class sourceArrayType;
public PGBuffersArray(Context context, ArrayType type, FieldFormat elementFormat, ByteBuf[] elementBuffers, int[] dimensions) {
this(context, type, elementFormat, elementBuffers, dimensions, null);
}
private PGBuffersArray(Context context, ArrayType type, FieldFormat elementFormat, ByteBuf[] elementBuffers, int[] dimensions, Class sourceArrayType) {
super(context, type);
this.elementFormat = elementFormat;
this.elementBuffers = elementBuffers;
this.dimensions = dimensions;
this.sourceArrayType = sourceArrayType;
}
public static PGBuffersArray encode(Context context, ArrayType type, Object array) throws IOException {
int[] dimensions = getDimensions(array);
int totalElements = strideOfDimensions(dimensions);
Type componentType = type.getElementType();
FieldFormat format = type.getElementType().getResultFormat();
List elementBuffers = new ArrayList<>(totalElements);
encode(context, componentType, format, array, elementBuffers);
return new PGBuffersArray(context, type, format, elementBuffers.toArray(EMPTY_BUFFERS), dimensions, array.getClass());
}
public static void encode(Context context, Type componentType, FieldFormat format, Object value, List elementBuffers) throws IOException {
if (value.getClass().isArray()) {
int length = Array.getLength(value);
for (int elementIdx = 0; elementIdx < length; ++elementIdx) {
Object element = Array.get(value, elementIdx);
if (element == null) {
elementBuffers.add(null);
continue;
}
encode(context, componentType, format, element, elementBuffers);
}
}
else {
ByteBufAllocator byteBufAllocator = context.getAllocator();
ByteBuf valueBuffer = null;
switch (format) {
case Text: {
StringBuilder elementBuffer = new StringBuilder();
componentType.getTextCodec().getEncoder()
.encode(context, componentType, value, null, elementBuffer);
valueBuffer = ByteBufUtil.writeUtf8(byteBufAllocator, elementBuffer);
}
break;
case Binary: {
valueBuffer = byteBufAllocator.buffer();
componentType.getBinaryCodec().getEncoder()
.encode(context, componentType, value, null, valueBuffer);
}
break;
}
elementBuffers.add(valueBuffer);
}
}
public int getLength() {
if (dimensions.length == 0) return 0;
return dimensions[0];
}
@Override
protected Object getArray(Context context, Class targetComponentType, long index, int count) throws SQLException {
int offset = (int) index - 1;
if (offset < 0 || (offset + count) > getLength()) {
throw new SQLException("Invalid array slice");
}
if (targetComponentType == null) {
Type elementType = type.getElementType();
Class elementClass =
sourceArrayType != null ?
getElementType(sourceArrayType) :
elementType.getCodec(elementFormat).getDecoder().getDefaultClass();
targetComponentType = lookupCustomType(elementType, context.getCustomTypeMap(), elementClass);
}
try {
return getArray(context, targetComponentType, dimensions, offset, count);
}
catch (IOException e) {
throw new SQLException(e);
}
}
private Object getArray(Context context, Class targetComponentType, int[] dimensions, int offset, int count) throws IOException {
Object result;
if (dimensions.length > 1) {
// Handle arrays of arrays
dimensions = dimensions.clone();
dimensions[0] = count;
result = Array.newInstance(targetComponentType, dimensions);
int[] subDimensions = copyOfRange(dimensions, 1, dimensions.length);
int stride = strideOfDimensions(subDimensions);
for (int c = 0; c < count; ++c) {
Object subArray = getArray(context, targetComponentType, subDimensions, offset + c * stride, subDimensions[0]);
Array.set(result, c, subArray);
}
}
else {
// Handle arrays of elements
Type componentType = type.getElementType();
result = Array.newInstance(targetComponentType, count);
targetComponentType = boxType(targetComponentType);
for (int c = 0; c < count; ++c) {
Object element = null;
ByteBuf elementBuffer = elementBuffers[offset + c];
if (elementBuffer != null) {
switch (elementFormat) {
case Text: {
String elementStr = elementBuffer.toString(UTF_8);
element = componentType.getTextCodec().getDecoder()
.decode(context, componentType, componentType.getLength(), null, elementStr, targetComponentType, null);
}
break;
case Binary: {
element = componentType.getBinaryCodec().getDecoder()
.decode(context, componentType, componentType.getLength(), null, elementBuffer, targetComponentType, null);
}
break;
}
elementBuffer.resetReaderIndex();
}
Array.set(result, c, element);
}
}
return result;
}
@Override
protected ResultSet getResultSet(Context context, long index, int count) throws SQLException {
int offset = (int) index - 1;
if (offset < 0 || (offset + count) > getLength()) {
throw new SQLException("Invalid array slice");
}
ByteBufAllocator byteBufAllocator = context.getAllocator();
Registry reg = context.getRegistry();
int stride = strideOfDimensions(dimensions, 1);
FieldFormat elementFormat;
Type elementType;
if (stride > 1) {
elementType = new NestedArrayType(type, type.getElementType(), this.elementFormat, copyOfRange(dimensions, 1, dimensions.length));
elementFormat = FieldFormat.Binary;
}
else {
elementType = type.getElementType();
elementFormat = this.elementFormat;
}
ResultField[] fields = new ResultField[] {
new ResultField("INDEX", 0, (short) 0, reg.loadBaseType("int4"), (short) 0, 0, FieldFormat.Binary),
new ResultField("VALUE", 0, (short) 0, elementType, (short) 0, 0, elementFormat)
};
RowDataSet results = new RowDataSet(count);
for (int c = 0; c < count; ++c) {
ByteBuf indexBuffer = byteBufAllocator.buffer(4).writeInt(offset + c + 1);
ByteBuf elementBuffer;
if (stride > 1) {
CompositeByteBuf compElementBuffer = byteBufAllocator.compositeBuffer(stride);
for (int s = 0; s < stride; ++s) {
compElementBuffer.addComponent(elementBuffers[((offset + c) * stride) + s].retainedDuplicate());
}
elementBuffer = compElementBuffer;
}
else {
elementBuffer = elementBuffers[offset + c].retainedDuplicate();
}
results.add(new FieldBuffersRowData(new ByteBuf[] {indexBuffer, elementBuffer}, context.getAllocator()));
}
PGDirectConnection connection = (PGDirectConnection) context.unwrap();
PGStatement stmt = connection.createStatement();
stmt.closeOnCompletion();
return stmt.createResultSet(fields, results, true, context.getCustomTypeMap());
}
@Override
public void free() {
for (ByteBuf elementBuf : elementBuffers) {
ReferenceCountUtil.release(elementBuf);
}
this.context = null;
this.type = null;
this.elementFormat = null;
this.dimensions = null;
this.sourceArrayType = null;
this.elementBuffers = null;
}
}