/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License. You may obtain a
* copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package org.apache.geode.redis.internal.executor.string;
import java.util.List;
import org.apache.geode.cache.Region;
import org.apache.geode.redis.internal.ByteArrayWrapper;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.Command;
import org.apache.geode.redis.internal.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;
public class BitOpExecutor extends StringExecutor {
private static final String ERROR_NO_SUCH_OP = "Please specify a legal operation";
@Override
public void executeCommand(Command command, ExecutionHandlerContext context) {
List<byte[]> commandElems = command.getProcessedCommand();
Region<ByteArrayWrapper, ByteArrayWrapper> r = context.getRegionProvider().getStringsRegion();
if (commandElems.size() < 4) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.BITOP));
return;
}
String operation = command.getStringKey().toUpperCase();
ByteArrayWrapper destKey = new ByteArrayWrapper(commandElems.get(2));
checkDataType(destKey, context);
byte[][] values = new byte[commandElems.size() - 3][];
int maxLength = 0;
for (int i = 3; i < commandElems.size(); i++) {
ByteArrayWrapper key = new ByteArrayWrapper(commandElems.get(i));
checkDataType(key, context);
ByteArrayWrapper value = r.get(key);
if (value == null) {
values[i - 3] = null;
continue;
}
byte[] val = value.toBytes();
values[i - 3] = val;
if (val.length > maxLength) {
maxLength = val.length;
byte[] tmp = values[0];
values[0] = val;
values[i - 3] = tmp;
}
if (i == 3 && operation.equalsIgnoreCase("NOT"))
break;
}
if (operation.equals("AND"))
and(context, r, destKey, values, maxLength);
else if (operation.equals("OR"))
or(context, r, destKey, values, maxLength);
else if (operation.equals("XOR"))
xor(context, r, destKey, values, maxLength);
else if (operation.equals("NOT"))
not(context, r, destKey, values, maxLength);
else {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_NO_SUCH_OP));
return;
}
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), maxLength));
}
private void and(ExecutionHandlerContext context, Region<ByteArrayWrapper, ByteArrayWrapper> r,
ByteArrayWrapper destKey, byte[][] values, int max) {
byte[] dest = new byte[max];
outer: for (int i = 0; i < max; i++) {
byte b = values[0][i];
for (int j = 1; j < values.length; j++) {
if (values[j] == null) {
break outer;
} else if (i < values[j].length)
b &= values[j][i];
else
b &= 0;
}
dest[i] = b;
}
checkAndSetDataType(destKey, context);
r.put(destKey, new ByteArrayWrapper(dest));
}
private void or(ExecutionHandlerContext context, Region<ByteArrayWrapper, ByteArrayWrapper> r,
ByteArrayWrapper destKey, byte[][] values, int max) {
byte[] dest = new byte[max];
for (int i = 0; i < max; i++) {
byte b = values[0][i];
for (int j = 1; j < values.length; j++) {
byte[] cA = values[j];
if (cA != null && i < cA.length)
b |= cA[i];
else
b |= 0;
}
dest[i] = b;
}
checkAndSetDataType(destKey, context);
r.put(destKey, new ByteArrayWrapper(dest));
}
private void xor(ExecutionHandlerContext context, Region<ByteArrayWrapper, ByteArrayWrapper> r,
ByteArrayWrapper destKey, byte[][] values, int max) {
byte[] dest = new byte[max];
for (int i = 0; i < max; i++) {
byte b = values[0][i];
for (int j = 1; j < values.length; j++) {
byte[] cA = values[j];
if (cA != null && i < cA.length)
b ^= cA[i];
else
b ^= 0;
}
dest[i] = b;
}
checkAndSetDataType(destKey, context);
r.put(destKey, new ByteArrayWrapper(dest));
}
private void not(ExecutionHandlerContext context, Region<ByteArrayWrapper, ByteArrayWrapper> r,
ByteArrayWrapper destKey, byte[][] values, int max) {
byte[] dest = new byte[max];
byte[] cA = values[0];
for (int i = 0; i < max; i++) {
if (cA == null)
dest[i] = ~0;
else
dest[i] = (byte) (~cA[i] & 0xFF);
}
checkAndSetDataType(destKey, context);
r.put(destKey, new ByteArrayWrapper(dest));
}
}