ZkNodeCreationArg.java

/**
 * Copyright 2014 Comcast Cable Communications Management, LLC
 *
 * 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 com.comcast.viper.flume2storm.zookeeper;

import java.util.Arrays;
import java.util.List;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.ACL;

import com.google.common.base.Preconditions;

/**
 * ZooKeeper node creation argument. See ZooKeeper's documentation for details
 * on every one of them, except {@link #createHierarchy} which creates the
 * parent of the nodes if missing
 */
@SuppressWarnings("javadoc")
public class ZkNodeCreationArg {
  public static final byte[] DEFAULT_DATA = new byte[0];
  public static final List<ACL> DEFAULT_ACL = Ids.OPEN_ACL_UNSAFE;
  public static final CreateMode DEFAULT_CREATE_MODE = CreateMode.PERSISTENT;
  public static final boolean DEFAULT_CREATE_HIERARCHY = true;

  protected byte[] data;
  protected List<ACL> acl;
  protected CreateMode createMode;
  protected boolean createHierarchy;

  public ZkNodeCreationArg() {
    data = DEFAULT_DATA;
    acl = DEFAULT_ACL;
    createMode = DEFAULT_CREATE_MODE;
    createHierarchy = DEFAULT_CREATE_HIERARCHY;
  }

  public ZkNodeCreationArg(final ZkNodeCreationArg other) {
    data = other.data;
    acl = other.acl;
    createMode = other.createMode;
    createHierarchy = other.createHierarchy;
  }

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

  public ZkNodeCreationArg setData(final byte[] data) {
    Preconditions.checkNotNull(data, "What about an empty array, like it was before you tried to change it to null?");
    this.data = data;
    return this;
  }

  public List<ACL> getAcl() {
    return acl;
  }

  public ZkNodeCreationArg setAcl(final List<ACL> acl) {
    Preconditions.checkNotNull(acl, "No ACL specified. Wanna try Ids.OPEN_ACL_UNSAFE maybe?");
    this.acl = acl;
    return this;
  }

  public CreateMode getCreateMode() {
    return createMode;
  }

  public ZkNodeCreationArg setCreateMode(final CreateMode createMode) {
    Preconditions.checkNotNull(createMode, "Make up your mind!");
    this.createMode = createMode;
    return this;
  }

  public boolean isCreateHierarchy() {
    return createHierarchy;
  }

  public ZkNodeCreationArg setCreateHierarchy(final boolean createHierarchy) {
    this.createHierarchy = createHierarchy;
    return this;
  }

  /**
   * @see java.lang.Object#hashCode()
   */
  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((acl == null) ? 0 : acl.hashCode());
    result = prime * result + (createHierarchy ? 1231 : 1237);
    result = prime * result + ((createMode == null) ? 0 : createMode.hashCode());
    result = prime * result + Arrays.hashCode(data);
    return result;
  }

  /**
   * @see java.lang.Object#equals(java.lang.Object)
   */
  @Override
  public boolean equals(final Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final ZkNodeCreationArg other = (ZkNodeCreationArg) obj;
    if (acl == null) {
      if (other.acl != null) {
        return false;
      }
    } else if (!acl.equals(other.acl)) {
      return false;
    }
    if (createHierarchy != other.createHierarchy) {
      return false;
    }
    if (createMode != other.createMode) {
      return false;
    }
    if (!Arrays.equals(data, other.data)) {
      return false;
    }
    return true;
  }

  /**
   * @see java.lang.Object#toString()
   */
  @Override
  public String toString() {
    return "CreationArg [data=" + Arrays.toString(data) + ", acl=" + acl + ", createMode=" + createMode
        + ", createHierarchy=" + createHierarchy + "]";
  }
}