/**
* 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.system.Context;
import com.impossibl.postgres.types.Modifiers;
import com.impossibl.postgres.types.PrimitiveType;
import com.impossibl.postgres.types.Type;
import static com.impossibl.postgres.system.Settings.FIELD_VARYING_LENGTH_MAX;
import static com.impossibl.postgres.types.Modifiers.LENGTH;
import static com.impossibl.postgres.types.PrimitiveType.String;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import static java.lang.Math.min;
import io.netty.buffer.ByteBuf;
public class Strings extends SimpleProcProvider {
public static final BinDecoder BINARY_DECODER = new BinDecoder();
public static final BinEncoder BINARY_ENCODER = new BinEncoder();
public Strings() {
super(new TxtEncoder(), new TxtDecoder(), BINARY_ENCODER, BINARY_DECODER, new ModParser(), "text", "varchar", "bpchar", "char", "enum_", "json_", "cstring_", "unknown");
}
public static class BinDecoder extends BinaryDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return String;
}
@Override
public Class<?> getOutputType() {
return String.class;
}
@Override
public String decode(Type type, Short typeLength, Integer typeModifier, ByteBuf buffer, Context context) throws IOException {
int length = buffer.readInt();
if (length == -1) {
return null;
}
byte[] bytes;
Integer maxLength = (Integer) context.getSetting(FIELD_VARYING_LENGTH_MAX);
if (maxLength != null) {
bytes = new byte[min(maxLength, length)];
}
else {
bytes = new byte[length];
}
buffer.readBytes(bytes);
buffer.skipBytes(length - bytes.length);
return new String(bytes, context.getCharset());
}
}
public static class BinEncoder extends BinaryEncoder {
@Override
public Class<?> getInputType() {
return String.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return String;
}
byte[] toBytes(Object val, Context context) {
return val.toString().getBytes(context.getCharset());
}
@Override
public void encode(Type type, ByteBuf buffer, Object val, Context context) throws IOException {
if (val == null) {
buffer.writeInt(-1);
}
else {
byte[] bytes = toBytes(val, context);
buffer.writeInt(bytes.length);
buffer.writeBytes(bytes);
}
}
@Override
public int length(Type type, Object val, Context context) throws IOException {
return val == null ? 4 : 4 + toBytes(val, context).length;
}
}
public static class TxtDecoder extends TextDecoder {
@Override
public PrimitiveType getInputPrimitiveType() {
return String;
}
@Override
public Class<?> getOutputType() {
return String.class;
}
@Override
public String decode(Type type, Short typeLength, Integer typeModifier, CharSequence buffer, Context context) throws IOException {
return buffer.toString();
}
}
public static class TxtEncoder extends TextEncoder {
@Override
public Class<?> getInputType() {
return String.class;
}
@Override
public PrimitiveType getOutputPrimitiveType() {
return String;
}
@Override
public void encode(Type type, StringBuilder buffer, Object val, Context context) throws IOException {
if (val instanceof String) {
buffer.append((String)val);
}
else if (val.getClass() == byte[].class) {
buffer.append(new String((byte[]) val, context.getCharset()));
}
else {
throw new IOException(val.getClass() + " cannot be encoded as a String");
}
}
}
static class ModParser implements Modifiers.Parser {
@Override
public Map<String, Object> parse(long mod) {
Map<String, Object> mods = new HashMap<String, Object>();
if (mod > 4) {
mods.put(LENGTH, (int)(mod - 4));
}
return mods;
}
}
}