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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.ConcatenationOperation;
import net.spy.memcached.ops.ConcatenationType;
import net.spy.memcached.ops.OperationCallback;
import net.spy.memcached.ops.OperationStatus;

class ConcatenationOperationImpl extends OperationImpl
        implements ConcatenationOperation {

  private static final int APPEND = 0x0e;
  private static final int PREPEND = 0x0f;

  private final String key;
  private final long cas;
  private final ConcatenationType catType;
  private final byte[] data;

  private static int cmdMap(ConcatenationType t) {
    int rv = -1;
    switch (t) {
      case append:
        rv = APPEND;
        break;
      case prepend:
        rv = PREPEND;
        break;
    }
    // Check fall-through.
    assert rv != -1 : "Unhandled store type:  " + t;
    return rv;
  }

  public ConcatenationOperationImpl(ConcatenationType t, String k,
                                    byte[] d, long c, OperationCallback cb) {
    super(cmdMap(t), generateOpaque(), cb);
    key = k;
    data = d;
    cas = c;
    catType = t;
  }

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

  @Override
  protected OperationStatus getStatusForErrorCode(int errCode, byte[] errPl) {
    OperationStatus rv = null;
    switch (errCode) {
      case ERR_EXISTS:
        rv = EXISTS_STATUS;
        break;
      case ERR_NOT_FOUND:
        rv = NOT_FOUND_STATUS;
        break;
      case ERR_NOT_STORED:
        rv = NOT_FOUND_STATUS;
        break;
    }
    return rv;
  }

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

  public long getCasValue() {
    return cas;
  }

  public byte[] getData() {
    return data;
  }

  public ConcatenationType getStoreType() {
    return catType;
  }

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

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