Android Open Source - Calculator-for-Android Memory

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Back to project page Calculator-for-Android.

License

The source code is released under:

Apache License

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Java Source Code

//   Copyright 2012 Digipom Inc.
///*from  w w  w.j a  va  2s.co 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.calculator.logic;

import java.math.BigDecimal;
import java.util.Stack;

import android.util.Log;

import com.digipom.calculator.config.LoggerConfig;

class Memory {
  private static final String TAG = "Memory";
  private final Stack<BigDecimal> answerStack = new Stack<BigDecimal>();
  private final String[] storedExpressions = new String[10];

  void clearAnswers() {
    answerStack.clear();    
  }  

  BigDecimal getMostRecentAnswer() {
    if (answerStack.isEmpty()) {
      return BigDecimal.ZERO;
    } else {
      return answerStack.peek();
    }
  }

  void addAnswer(BigDecimal result) {
    answerStack.push(result);
  }

  void addExpressionToStore(int position, String expression) {
    if (position < 0 || position >= storedExpressions.length) {
      if (LoggerConfig.ON) {
        Log.w(TAG, "addToStore(): Invalid position: " + position);
      }
    } else {
      storedExpressions[position] = expression;
    }
  }
  
  String readExpressionFromStore(int position) {
    if (position < 0 || position >= storedExpressions.length) {
      if (LoggerConfig.ON) {
        Log.w(TAG, "addToStore(): Invalid position: " + position);
      }
      
      return "";
    } else {      
      return storedExpressions[position] == null ? "" : storedExpressions[position];
    }
  }
  
  int getStoreSize() {
    return storedExpressions.length;
  }
}

Java Source Code List