CassandraDaoUtil.java

/*
 * Copyright 2014-2016 CyberVision, Inc.
 *
 * Licensed 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.kaaproject.kaa.server.common.nosql.cassandra.dao;

import static org.apache.commons.lang.StringUtils.isNotBlank;

import com.datastax.driver.core.utils.Bytes;

import org.kaaproject.kaa.common.dto.EndpointGroupStateDto;
import org.kaaproject.kaa.common.dto.EventClassFamilyVersionStateDto;
import org.kaaproject.kaa.server.common.nosql.cassandra.dao.model.CassandraModelConstants;
import org.kaaproject.kaa.server.common.nosql.cassandra.dao.model.type.CassandraEndpointGroupState;
import org.kaaproject.kaa.server.common.nosql.cassandra.dao.model.type.CassandraEventClassFamilyVersionState;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class CassandraDaoUtil {

  private CassandraDaoUtil() {
  }

  /**
   * Specific method for converting list of <code>EndpointGroupStateDto</code> objects
   * to list of model objects <code>CassandraEndpointGroupState</code>.
   *
   * @param stateDtoList the state dto list
   * @return converted list of <code>CassandraEndpointGroupState</code> objects
   */
  public static List<CassandraEndpointGroupState> convertDtoToModelList(
      List<EndpointGroupStateDto> stateDtoList) {
    List<CassandraEndpointGroupState> states = null;
    if (stateDtoList != null && !stateDtoList.isEmpty()) {
      states = new ArrayList<>();
      for (EndpointGroupStateDto dto : stateDtoList) {
        CassandraEndpointGroupState state = new CassandraEndpointGroupState();
        state.setConfigurationId(dto.getConfigurationId());
        state.setEndpointGroupId(dto.getEndpointGroupId());
        state.setProfileFilterId(dto.getProfileFilterId());
        states.add(state);
      }
    }
    return states;
  }

  /**
   * Specific method for converting list of <code>EventClassFamilyVersionStateDto</code> objects
   * to list of model objects <code>CassandraEventClassFamilyVersionState</code>.
   *
   * @return converted list of <code>CassandraEventClassFamilyVersionState</code> objects
   */
  public static List<CassandraEventClassFamilyVersionState> convertEcfVersionDtoToModelList(
      List<EventClassFamilyVersionStateDto> stateDtoList) {
    List<CassandraEventClassFamilyVersionState> states = null;
    if (stateDtoList != null && !stateDtoList.isEmpty()) {
      states = new ArrayList<>();
      for (EventClassFamilyVersionStateDto dto : stateDtoList) {
        CassandraEventClassFamilyVersionState state =
            new CassandraEventClassFamilyVersionState();
        state.setEcfId(dto.getEcfId());
        state.setVersion(dto.getVersion());
        states.add(state);
      }
    }
    return states;
  }

  /**
   * This method convert  byte array to ByteBuffer object.
   *
   * @return the ByteBuffer object or null
   */
  public static ByteBuffer getByteBuffer(byte[] array) {
    ByteBuffer bb = null;
    if (array != null) {
      bb = ByteBuffer.wrap(array);
    }
    return bb;
  }

  /**
   * This method convert ByteBuffer object to byte array.
   *
   * @return the byte array or null
   */
  public static byte[] getBytes(ByteBuffer byteBuffer) {
    byte[] array = null;
    if (byteBuffer != null) {
      array = Bytes.getArray(byteBuffer);
    }
    return array;
  }

  /**
   * This method convert string id to substring fields divided by {@link
   * org.kaaproject.kaa.server.common.nosql.cassandra.dao.model.CassandraModelConstants#
   * KEY_DELIMITER
   * }
   *
   * @return the string array or null
   */
  public static String[] parseId(String id) {
    String[] ids = null;
    if (isNotBlank(id) && id.contains(CassandraModelConstants.KEY_DELIMITER)) {
      ids = id.split(CassandraModelConstants.KEY_DELIMITER);
    }
    return ids;
  }

  /**
   * This method convert ByteBuffer object to string representation,
   * if endpointKeyHash eq null, than return null.
   *
   * @return the String representation of endpoint key hash
   */
  public static String convertKeyHashToString(ByteBuffer endpointKeyHash) {
    String id = null;
    if (endpointKeyHash != null) {
      id = Bytes.toHexString(endpointKeyHash);
    }
    return id;
  }

  /**
   * Convert key hash to string.
   *
   * @param endpointKeyHash is key hash to convert
   * @return string
   */
  public static String convertKeyHashToString(byte[] endpointKeyHash) {
    String id = null;
    if (endpointKeyHash != null) {
      id = Bytes.toHexString(endpointKeyHash);
    }
    return id;
  }

  /**
   * This method convert string representation of endpoint key hash to ByteBuffer object
   * if id eq null, than return null.
   *
   * @return the ByteBuffer object
   */
  public static ByteBuffer convertStringToKeyHash(String id) {
    ByteBuffer endpointKeyHash = null;
    if (id != null && id.length() != 0) {
      endpointKeyHash = Bytes.fromHexString(id);
    }
    return endpointKeyHash;
  }
}