/**
* 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.system.procs;
import com.impossibl.postgres.api.data.Range;
import com.impossibl.postgres.system.Context;
import com.impossibl.postgres.types.PrimitiveType;
import com.impossibl.postgres.types.RangeType;
import com.impossibl.postgres.types.Type;
import java.io.IOException;
import io.netty.buffer.ByteBuf;
public class Ranges extends SimpleProcProvider {
public Ranges() {
super(new TxtEncoder(), new TxtDecoder(), new BinEncoder(), new BinDecoder(), "range_");
}
static class BinDecoder extends BinaryDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return PrimitiveType.Range;
}
@Override
public Class<?> getOutputType() {
return Range.class;
}
@Override
public Range<?> decode(Type type, Short typeLength, Integer typeModifier, ByteBuf buffer, Context context) throws IOException {
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
Range<?> instance = null;
int length = buffer.readInt();
if (length != -1) {
Range.Flags flags = new Range.Flags(buffer.readByte());
Object[] values = new Object[2];
if (flags.hasLowerBound()) {
values[0] = baseType.getBinaryCodec().decoder.decode(baseType, null, null, buffer, context);
}
if (flags.hasUpperBound()) {
values[1] = baseType.getBinaryCodec().decoder.decode(baseType, null, null, buffer, context);
}
instance = new Range<Object>(flags, values);
}
return instance;
}
}
static class BinEncoder extends BinaryEncoder {
@Override
public Class<?> getInputType() {
return Range.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return PrimitiveType.Range;
}
@Override
public void encode(Type type, ByteBuf buffer, Object val, Context context) throws IOException {
buffer.writeInt(-1);
if (val != null) {
int writeStart = buffer.writerIndex();
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
Range<?> range = (Range<?>) val;
buffer.writeByte(range.getFlags().getValue());
if (range.getFlags().hasLowerBound()) {
baseType.getBinaryCodec().encoder.encode(baseType, buffer, range.getLowerBound(), context);
}
if (range.getFlags().hasUpperBound()) {
baseType.getBinaryCodec().encoder.encode(baseType, buffer, range.getUpperBound(), context);
}
// Set length
buffer.setInt(writeStart - 4, buffer.writerIndex() - writeStart);
}
}
}
static class TxtDecoder extends TextDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return PrimitiveType.Range;
}
@Override
public Class<?> getOutputType() {
return Range.class;
}
@Override
public Range<?> decode(Type type, Short typeLength, Integer typeModifier, CharSequence buffer, Context context) throws IOException {
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
boolean lowerInc = false, upperInc = false;
Object lower = null, upper = null;
if (buffer.charAt(0) == '[') {
lowerInc = true;
}
if (buffer.charAt(buffer.length() - 1) == ']') {
upperInc = true;
}
CharSequence lowerTxt = buffer.subSequence(1, findBound(buffer, 1));
if (lowerTxt.length() != 0) {
lower = baseType.getTextCodec().decoder.decode(baseType, null, null, lowerTxt, context);
}
CharSequence upperTxt = buffer.subSequence(2 + lowerTxt.length(), buffer.length() - 1);
if (upperTxt.length() != 0) {
upper = baseType.getTextCodec().decoder.decode(baseType, null, null, upperTxt, context);
}
return Range.create(lower, lowerInc, upper, upperInc);
}
private int findBound(CharSequence buffer, int start) {
boolean string = false;
int stop;
for (stop = start; stop < buffer.length(); ++stop) {
char ch = buffer.charAt(stop);
switch (ch) {
case '"':
string = !string;
break;
case '\\':
++stop;
break;
default:
if (ch == ',' && !string) {
return stop;
}
}
}
return stop;
}
}
static class TxtEncoder extends TextEncoder {
@Override
public Class<?> getInputType() {
return Range.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return PrimitiveType.Range;
}
@Override
public void encode(Type type, StringBuilder buffer, Object val, Context context) throws IOException {
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
Range<?> range = (Range<?>) val;
if (range.isLowerBoundInclusive()) {
buffer.append('[');
}
else {
buffer.append('(');
}
if (range.hasLowerBound()) {
StringBuilder lowerBuffer = new StringBuilder();
baseType.getTextCodec().encoder.encode(baseType, lowerBuffer, range.getLowerBound(), context);
String lower = lowerBuffer.toString();
if (needsQuotes(lower)) {
buffer.append('"').append(lower).append('"');
}
else {
buffer.append(lower);
}
}
buffer.append(',');
if (range.hasUpperBound()) {
StringBuilder upperBuffer = new StringBuilder();
baseType.getTextCodec().encoder.encode(baseType, upperBuffer, range.getUpperBound(), context);
String upper = upperBuffer.toString();
if (needsQuotes(upper)) {
buffer.append('"').append(upper).append('"');
}
else {
buffer.append(upper);
}
}
if (range.isUpperBoundInclusive()) {
buffer.append(']');
}
else {
buffer.append(')');
}
}
private boolean needsQuotes(String elemStr) {
if (elemStr.isEmpty())
return true;
if (elemStr.equalsIgnoreCase("NULL"))
return true;
for (int c = 0; c < elemStr.length(); ++c) {
char ch = elemStr.charAt(c);
if (ch == '"' || ch == '\\' || ch == '{' || ch == '}' || ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r' || ch == '\f')
return true;
}
return false;
}
}
}