/*
* 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 GetBitExecutor extends StringExecutor {
private final String ERROR_NOT_INT = "The offset provided must be numeric";
@Override
public void executeCommand(Command command, ExecutionHandlerContext context) {
List<byte[]> commandElems = command.getProcessedCommand();
Region<ByteArrayWrapper, ByteArrayWrapper> r = context.getRegionProvider().getStringsRegion();
if (commandElems.size() < 3) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.GETBIT));
return;
}
ByteArrayWrapper key = command.getKey();
checkAndSetDataType(key, context);
ByteArrayWrapper wrapper = r.get(key);
if (wrapper == null) {
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), 0));
return;
}
int bit = 0;
byte[] bytes = wrapper.toBytes();
int offset;
try {
byte[] offAr = commandElems.get(2);
offset = Coder.bytesToInt(offAr);
} catch (NumberFormatException e) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_NOT_INT));
return;
}
if (offset < 0)
offset += bytes.length * 8;
if (offset < 0 || offset > bytes.length * 8) {
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), 0));
return;
}
int byteIndex = offset / 8;
offset %= 8;
if (byteIndex >= bytes.length) {
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), 0));
return;
}
bit = (bytes[byteIndex] & (0x80 >> offset)) >> (7 - offset);
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), bit));
}
}