/*
* 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.Command;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisConstants;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;
public class BitCountExecutor extends StringExecutor {
private final String ERROR_NOT_INT = "The indexes provided must be numeric values";
@Override
public void executeCommand(Command command, ExecutionHandlerContext context) {
List<byte[]> commandElems = command.getProcessedCommand();
Region<ByteArrayWrapper, ByteArrayWrapper> r = context.getRegionProvider().getStringsRegion();
if (commandElems.size() != 2 && commandElems.size() != 4) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.BITCOUNT));
return;
}
ByteArrayWrapper key = command.getKey();
checkAndSetDataType(key, context);
ByteArrayWrapper wrapper = r.get(key);
if (wrapper == null) {
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), 0));
return;
}
byte[] value = wrapper.toBytes();
long startL = 0;
long endL = value.length - 1;
if (commandElems.size() == 4) {
try {
startL = Coder.bytesToLong(commandElems.get(2));
endL = Coder.bytesToLong(commandElems.get(3));
} catch (NumberFormatException e) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_NOT_INT));
return;
}
}
if (startL > Integer.MAX_VALUE || endL > Integer.MAX_VALUE) {
command.setResponse(
Coder.getErrorResponse(context.getByteBufAllocator(), RedisConstants.ERROR_OUT_OF_RANGE));
return;
}
int start = (int) startL;
int end = (int) endL;
if (start < 0)
start += value.length;
if (end < 0)
end += value.length;
if (start < 0)
start = 0;
if (end < 0)
end = 0;
if (end > value.length - 1)
end = value.length - 1;
if (end < start || start >= value.length) {
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), 0));
return;
}
long setBits = 0;
for (int j = start; j <= end; j++)
setBits += Integer.bitCount(0xFF & value[j]); // 0xFF keeps same bit sequence as the byte as
// opposed to keeping the same value
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), setBits));
}
}