gemfire-core/src/main/java/com/gemstone/gemfire/internal/redis/executor/string/StrlenExecutor.java

package com.gemstone.gemfire.internal.redis.executor.string;

import java.util.List;

import com.gemstone.gemfire.cache.Region;
import com.gemstone.gemfire.internal.redis.ByteArrayWrapper;
import com.gemstone.gemfire.internal.redis.Command;
import com.gemstone.gemfire.internal.redis.ExecutionHandlerContext;
import com.gemstone.gemfire.internal.redis.RedisDataType;
import com.gemstone.gemfire.internal.redis.Coder;
import com.gemstone.gemfire.internal.redis.RedisConstants.ArityDef;

public class StrlenExecutor extends StringExecutor {

  private final int KEY_DOES_NOT_EXIST = 0;

  @Override
  public void executeCommand(Command command, ExecutionHandlerContext context) {
    List<byte[]> commandElems = command.getProcessedCommand();

    Region<ByteArrayWrapper, ByteArrayWrapper> r = context.getRegionCache().getStringsRegion();

    if (commandElems.size() < 2) {
      command.setResponse(Coder.getErrorResponse(context.getByteBufAllocator(), ArityDef.STRLEN));
      return;
    }

    ByteArrayWrapper key = command.getKey();
    checkDataType(key, RedisDataType.REDIS_STRING, context);
    ByteArrayWrapper valueWrapper = r.get(key);


    if (valueWrapper == null)
      command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), KEY_DOES_NOT_EXIST));
    else
      command.setResponse(Coder.getIntegerResponse(context.getByteBufAllocator(), valueWrapper.toBytes().length));

  }

}