/*
* 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.ArityDef;
public class AppendExecutor extends StringExecutor {
private final int VALUE_INDEX = 2;
@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.APPEND));
return;
}
ByteArrayWrapper key = command.getKey();
checkAndSetDataType(key, context);
ByteArrayWrapper string = r.get(key);
byte[] stringByteArray = commandElems.get(VALUE_INDEX);
if (string == null) {
r.put(key, new ByteArrayWrapper(stringByteArray));
command.setResponse(
Coder.getIntegerResponse(context.getByteBufAllocator(), stringByteArray.length));
} else {
byte[] newValue = concatArrays(string.toBytes(), stringByteArray);
string.setBytes(newValue);
r.put(key, string);
command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), newValue.length));
}
}
private byte[] concatArrays(byte[] o, byte[] n) {
int oLen = o.length;
int nLen = n.length;
byte[] combined = new byte[oLen + nLen];
System.arraycopy(o, 0, combined, 0, oLen);
System.arraycopy(n, 0, combined, oLen, nLen);
return combined;
}
}