Android Open Source - interdroid-swan Math Operator

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License

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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...

Java Source Code

package interdroid.swan.swansong;
//w w  w.j  av  a 2  s  .c o  m
/**
 * An enumeration which represents Mathematical Operators.
 * 
 * @author roelof <rkemp@cs.vu.nl>
 * @author nick <palmer@cs.vu.nl>
 * 
 */
public enum MathOperator implements ParseableEnum<MathOperator> {
  /** The minus operator. Can be used for Locations as well. */
  MINUS(0, "-"),
  /** The plus operator. */
  PLUS(1, "+"),
  /** The times operator. */
  TIMES(2, "*"),
  /** The divide operator. */
  DIVIDE(3, "/"),
  /** The modulus operator. */
  MOD(4, "%");

  /**
   * The persistence value of the enum.
   */
  private final int mValue;

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

  /**
   * Construct an operator.
   * 
   * @param value
   *            the convert value for the enum
   * @param name
   *            the name of the operation
   */
  private MathOperator(final int value, final String name) {
    mValue = value;
    mName = name;
  }

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

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

  /**
   * Parse and return a MathOperator.
   * 
   * @param val
   *            the string to parse
   * @return the corresponding MathOperator
   */
  private MathOperator parseString(final String val) {
    MathOperator ret = null;
    for (MathOperator op : MathOperator.values()) {
      if (op.toParseString().equals(val)) {
        ret = op;
        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 MathOperator parse(final String value) {
    return MINUS.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 MathOperator convert(final int value) {
    return MINUS.convertInt(value);
  }

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

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

Java Source Code List

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