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/**
* 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.RangeType;
import com.impossibl.postgres.types.Type;
import java.io.IOException;
import java.text.ParseException;
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 BaseBinaryDecoder {
@Override
public Class getDefaultClass() {
return Range.class;
}
@Override
protected Object decodeValue(Context context, Type type, Short typeLength, Integer typeModifier, ByteBuf buffer, Class targetClass, Object targetContext) throws IOException {
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
Range.Flags flags = new Range.Flags(buffer.readByte());
Object[] values = new Object[2];
Type.Codec.Decoder decoder = baseType.getBinaryCodec().getDecoder();
if (flags.hasLowerBound()) {
values[0] = decoder.decode(context, baseType, null, null, buffer, targetClass, targetContext);
}
if (flags.hasUpperBound()) {
values[1] = decoder.decode(context, baseType, null, null, buffer, targetClass, targetContext);
}
return new Range<>(flags, values);
}
}
static class BinEncoder extends BaseBinaryEncoder {
@Override
protected void encodeValue(Context context, Type type, Object value, Object sourceContext, ByteBuf buffer) throws IOException {
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
Range range = (Range) value;
buffer.writeByte(range.getFlags().getValue());
Type.Codec.Encoder encoder = baseType.getBinaryCodec().getEncoder();
if (range.getFlags().hasLowerBound()) {
encoder.encode(context, baseType, range.getLowerBound(), sourceContext, buffer);
}
if (range.getFlags().hasUpperBound()) {
encoder.encode(context, baseType, range.getUpperBound(), sourceContext, buffer);
}
}
}
static class TxtDecoder extends BaseTextDecoder {
@Override
public Class getDefaultClass() {
return Range.class;
}
@Override
protected Object decodeValue(Context context, Type type, Short typeLength, Integer typeModifier, CharSequence buffer, Class targetClass, Object targetContext) throws IOException, ParseException {
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;
}
Type.Codec.Decoder decoder = baseType.getTextCodec().getDecoder();
CharSequence lowerTxt = buffer.subSequence(1, findBound(buffer));
if (lowerTxt.length() != 0) {
lower = decoder.decode(context, baseType, null, null, lowerTxt, targetClass, targetContext);
}
CharSequence upperTxt = buffer.subSequence(2 + lowerTxt.length(), buffer.length() - 1);
if (upperTxt.length() != 0) {
upper = decoder.decode(context, baseType, null, null, upperTxt, targetClass, targetContext);
}
return Range.create(lower, lowerInc, upper, upperInc);
}
private static int findBound(CharSequence buffer) {
boolean string = false;
int stop;
for (stop = 1; 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 BaseTextEncoder {
@Override
protected void encodeValue(Context context, Type type, Object value, Object sourceContext, StringBuilder buffer) throws IOException {
RangeType rangeType = (RangeType) type;
Type baseType = rangeType.getBase();
Range range = (Range) value;
if (range.isLowerBoundInclusive()) {
buffer.append('[');
}
else {
buffer.append('(');
}
BaseTextEncoder encoder = (BaseTextEncoder) baseType.getTextCodec().getEncoder();
if (range.hasLowerBound()) {
StringBuilder lowerBuffer = new StringBuilder();
encoder.encodeValue(context, baseType, range.getLowerBound(), sourceContext, lowerBuffer);
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();
encoder.encodeValue(context, baseType, range.getUpperBound(), sourceContext, upperBuffer);
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 static 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;
}
}
}