Android Open Source - interdroid-swan Binary Logic Operator

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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 ww w  .  j av a  2 s .c  o  m

/**
 * An enumeration which represents BinaryLogicalOperators.
 * 
 * @author nick &lt;palmer@cs.vu.nl&gt;
 * 
 */
public enum BinaryLogicOperator implements ParseableEnum<BinaryLogicOperator>,
    LogicOperator {
  /** Logical AND. */
  AND(0, "&&"),
  /** Logical OR. */
  OR(1, "||");

  /** The converted value of this value. */
  private int mValue;

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

  /**
   * Construct a BinaryLogical Operator.
   * 
   * @param value
   *            the converted value.
   * @param name
   *            the name of the operator.
   */
  private BinaryLogicOperator(final int value, final String name) {
    mValue = value;
    mName = name;
  }

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

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

  /**
   * Parses and returns a BinaryLogicOperator.
   * 
   * @param val
   *            the string to parse
   * @return the corresponding BinaryLogicOperator
   */
  public BinaryLogicOperator parseString(final String val) {
    BinaryLogicOperator ret = null;
    for (BinaryLogicOperator op : BinaryLogicOperator.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 BinaryLogicOperator parse(final String value) {
    return AND.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 BinaryLogicOperator convert(final int value) {
    return AND.convertInt(value);
  }

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

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

  @Override
  public TriState operate(TriState first, TriState last) {
    if (mValue == 0) {
      // AND
      if (first == TriState.TRUE && last == TriState.TRUE) {
        return TriState.TRUE;
      } else if (first == TriState.UNDEFINED || last == TriState.UNDEFINED) {
        return TriState.UNDEFINED;
      } else {
        return TriState.FALSE;
      }
    } else if (mValue == 1) {
      // OR
      if (first == TriState.UNDEFINED && last == TriState.UNDEFINED) {
        return TriState.UNDEFINED;
      } else if (first == TriState.TRUE || last == TriState.TRUE) {
        return TriState.TRUE;
      } else {
        return TriState.FALSE;
      }
    } else {
      return TriState.UNDEFINED;
    }
  }
}

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