/*
* 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.Arrays;
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.ExecutionHandlerContext;
import org.apache.geode.redis.internal.RedisDataType;
import org.apache.geode.redis.internal.Coder;
import org.apache.geode.redis.internal.RedisConstants.ArityDef;
public class GetRangeExecutor extends StringExecutor {
private final String ERROR_NOT_INT = "The indexes provided must be numeric values";
private final int startIndex = 2;
private final int stopIndex = 3;
@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.GETRANGE));
return;
}
ByteArrayWrapper key = command.getKey();
checkDataType(key, RedisDataType.REDIS_STRING, context);
ByteArrayWrapper valueWrapper = r.get(key);
if (valueWrapper == null) {
command.setResponse(Coder.getNilResponse(context.getByteBufAllocator()));
return;
}
byte[] value = valueWrapper.toBytes();
int length = value.length;
long start;
long end;
try {
byte[] startI = commandElems.get(startIndex);
byte[] stopI = commandElems.get(stopIndex);
start = Coder.bytesToLong(startI);
end = Coder.bytesToLong(stopI);
} catch (NumberFormatException e) {
command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ERROR_NOT_INT));
return;
}
start = getBoundedStartIndex(start, length);
end = getBoundedEndIndex(end, length);
/*
* If the properly formatted indexes are illegal, send nil
*/
if (start > end || start == length) {
command.setResponse(Coder.getNilResponse(context.getByteBufAllocator()));
return;
}
/*
* 1 is added to end because the end in copyOfRange is exclusive but in Redis it is inclusive
*/
if (end != length)
end++;
byte[] returnRange = Arrays.copyOfRange(value, (int) start, (int) end);
if (returnRange == null || returnRange.length == 0) {
command.setResponse(Coder.getNilResponse(context.getByteBufAllocator()));
return;
}
command.setResponse(Coder.getBulkStringResponse(context.getByteBufAllocator(), returnRange));
}
}