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Java client for Arcus memcached

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package net.spy.memcached.protocol.binary;

import java.util.Collection;
import java.util.Collections;

import net.spy.memcached.ops.DeleteOperation;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationStatus;

class DeleteOperationImpl extends OperationImpl implements
        DeleteOperation {

  private static final int CMD = 4;

  private final String key;
  private final long cas;

  public DeleteOperationImpl(String k, OperationCallback cb) {
    this(k, 0, cb);
  }

  public DeleteOperationImpl(String k, long c, OperationCallback cb) {
    super(CMD, generateOpaque(), cb);
    key = k;
    cas = c;
  }

  @Override
  public void initialize() {
    prepareBuffer(key, cas, EMPTY_BYTES);
  }

  @Override
  protected OperationStatus getStatusForErrorCode(int errCode, byte[] errPl) {
    return errCode == ERR_NOT_FOUND ? NOT_FOUND_STATUS : null;
  }

  public Collection getKeys() {
    return Collections.singleton(key);
  }

  @Override
  public boolean isBulkOperation() {
    return false;
  }

  @Override
  public boolean isPipeOperation() {
    return false;
  }
}