/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.cache.operations;

/**
 * Enumeration for various interest types supported by GemFire.
 * 
 * @since GemFire 5.5
 */
public final class InterestType {

  public static final byte TP_KEY = 0;

  public static final byte TP_REGEX = 1;

  // public static final byte TP_FILTER_CLASS = 2;

  // public static final byte TP_OQL = 3;

  public static final byte TP_LIST = 4;

  private static byte nextOrdinal = 0;

  private static final InterestType[] VALUES = new InterestType[10];

  /**
   * For registering interest in a specific key.
   */
  public static final InterestType KEY = new InterestType("KEY", TP_KEY);

  /**
   * For registering interest in a list of keys.
   */
  public static final InterestType LIST = new InterestType("LIST", TP_LIST);

  /**
   * For registering interest in all keys matching a regular expression.
   */
  public static final InterestType REGULAR_EXPRESSION =
      new InterestType("REGULAR_EXPRESSION", TP_REGEX);

  /**
   * For registering interest in all key/value pairs that satisfy a provided filtering class.
   */
  // public static final InterestType FILTER_CLASS = new InterestType(
  // "FILTER_CLASS", TP_FILTER_CLASS);

  /**
   * For registering interest in all key/value pairs that satisfy an OQL query.
   */
  // public static final InterestType OQL_QUERY = new InterestType("OQL_QUERY",
  // TP_OQL);

  /** The name of this interest type. */
  private final String name;

  /** byte used as ordinal to represent this interest type */
  private final byte ordinal;

  /**
   * One of the following: TP_KEY, TP_LIST, TP_REGEX, TP_FILTER_CLASS, TP_OQL. TP_FILTER_CLASS and
   * TP_OQL are currently unimplemented.
   */
  private final byte interestType;

  /** Creates a new instance of <code>InterestType</code>. */
  private InterestType(String name, byte interestType) {
    this.name = name;
    this.interestType = interestType;
    this.ordinal = nextOrdinal++;
    VALUES[this.ordinal] = this;
  }

  /**
   * Returns true if this is a key interest type.
   */
  public boolean isKey() {
    return (this.interestType == TP_KEY);
  }

  /**
   * Returns true if this is a key list interest type.
   */
  public boolean isList() {
    return (this.interestType == TP_LIST);
  }

  /**
   * Returns true if this is a regular expression interest type.
   */
  public boolean isRegularExpression() {
    return (this.interestType == TP_REGEX);
  }

  /**
   * Returns true if this is a filter class interest type.
   */
  // public boolean isFilterClass() {
  // return (this.interestType == TP_FILTER_CLASS);
  // }

  /**
   * Returns true if this is an OQL query interest type.
   */
  // public boolean isOQLQuery() {
  // return (this.interestType == TP_OQL);
  // }

  /**
   * Returns the <code>InterestType</code> represented by specified ordinal.
   */
  public static InterestType fromOrdinal(byte ordinal) {
    return VALUES[ordinal];
  }

  /**
   * Returns the ordinal for this interest type.
   * 
   * @return the ordinal of this interest type.
   */
  public byte toOrdinal() {
    return this.ordinal;
  }

  /**
   * Returns a string representation for this interest type.
   * 
   * @return the name of this interest type.
   */
  @Override // GemStoneAddition
  public String toString() {
    return this.name;
  }

}
