Android Open Source - Calculator-for-Android Operator

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License

The source code is released under:

Apache License

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Java Source Code

//   Copyright 2012 Digipom Inc.
///* w ww. j a  va2  s . c o  m*/
//   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.digipom.android.library.evaluator.lexer;

import static com.digipom.android.library.evaluator.lexer.Operator.Associativity.LEFT;
import static com.digipom.android.library.evaluator.lexer.Operator.Associativity.RIGHT;

public enum Operator implements Token {
  ADD(0, LEFT), SUBTRACT(0, LEFT), MULTIPLY(1, LEFT), DIVIDE(1, LEFT), NEGATION(2, RIGHT), POWER(3, RIGHT);  

  public static enum Associativity {
    LEFT, RIGHT
  }

  public final int precedence;
  public final Associativity associativity;

  private Operator(int precedence, Associativity associativity) {
    this.precedence = precedence;
    this.associativity = associativity;
  }
  
  @Override
  public String toString() {
    if (this == ADD) {
      return "+";
    } else if (this == SUBTRACT || this == NEGATION) {
      return "-";
    } else if (this == MULTIPLY) {
      return "*";
    } else if (this == DIVIDE) {
      return "/";
    } else {
      return "^";
    }
  }
}

Java Source Code List