Android Open Source - interdroid-swan Comparator

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License

The source code is released under:

Copyright (c) 2008-2011 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

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Java Source Code

package interdroid.swan.swansong;
//from  w w w .  j  a va  2 s.  co  m

/**
 * The ways we know how to compare values.
 * 
 * @author roelof &lt;rkemp@cs.vu.nl&gt;
 * @author nick &lt;palmer@cs.vu.nl&gt;
 * 
 */
public enum Comparator implements ParseableEnum<Comparator> {

  /** greater than. */
  GREATER_THAN(0, ">"),
  /** less than. */
  LESS_THAN(1, "<"),
  /** greater than or equal to. */
  GREATER_THAN_OR_EQUALS(2, ">="),
  /** less than or equal to. */
  LESS_THAN_OR_EQUALS(3, "<="),
  /** equal to. */
  EQUALS(4, "=="),
  /** not equal to. */
  NOT_EQUALS(5, "!="),
  /** Regular Expression Match. */
  REGEX_MATCH(6, "regex"),
  /** String contains. */
  STRING_CONTAINS(7, "contains");

  /**
   * The converted value for this enum.
   */
  private final int mValue;

  /** The string version of the enum. */
  private String mName;

  /**
   * Constructs a Comparator.
   * 
   * @param value
   *            the convert value
   * @param name
   *            the name of the comparator
   */
  private Comparator(final int value, final String name) {
    mValue = value;
    mName = name;
  }

  @Override
  public final String toString() {
    return mName;
  }

  @Override
  public int convert() {
    return mValue;
  }

  @Override
  public Comparator convertInt(final int val) {
    Comparator ret = null;
    for (Comparator comp : Comparator.values()) {
      if (comp.convert() == val) {
        ret = comp;
        break;
      }
    }
    return ret;
  }

  /**
   * Parses a string and returns a Comparator.
   * 
   * @param val
   *            a string to parse
   * @return the parsed Comparator
   */
  private Comparator parseString(final String val) {
    Comparator ret = null;
    for (Comparator comp : Comparator.values()) {
      if (comp.toParseString().equals(val)) {
        ret = comp;
        break;
      }
    }
    return ret;
  }

  /**
   * Parse a string and return the value.
   * 
   * @param value
   *            the value to parse
   * @return the enum which matches the string.
   */
  public static Comparator parse(final String value) {
    return GREATER_THAN.parseString(value);
  }

  /**
   * Converts a persisted int to the matching enumeration value.
   * 
   * @param value
   *            the value to get the enumeration for
   * @return the enumeration matching this value
   */
  public static Comparator convert(final int value) {
    return GREATER_THAN.convertInt(value);
  }

  @Override
  public String toParseString() {
    return mName;
  }

}

Java Source Code List