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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.exif;
     18 
     19 // TODO: Move this class to under util package.
     20 /**
     21  * The rational data type of EXIF tag. Contains a pair of longs representing the
     22  * numerator and denominator of a Rational number.
     23  */
     24 public class Rational {
     25 
     26     private final long mNumerator;
     27     private final long mDenominator;
     28 
     29     /**
     30      * Create a Rational with a given numerator and denominator.
     31      *
     32      * @param numerator
     33      * @param denominator
     34      */
     35     public Rational(long numerator, long denominator) {
     36         mNumerator = numerator;
     37         mDenominator = denominator;
     38     }
     39 
     40     /**
     41      * Create a copy of a Rational.
     42      */
     43     public Rational(Rational r) {
     44         mNumerator = r.mNumerator;
     45         mDenominator = r.mDenominator;
     46     }
     47 
     48     /**
     49      * Gets the numerator of the rational.
     50      */
     51     public long getNumerator() {
     52         return mNumerator;
     53     }
     54 
     55     /**
     56      * Gets the denominator of the rational
     57      */
     58     public long getDenominator() {
     59         return mDenominator;
     60     }
     61 
     62     /**
     63      * Gets the rational value as type double. Will cause a divide-by-zero error
     64      * if the denominator is 0.
     65      */
     66     public double toDouble() {
     67         return mNumerator / (double) mDenominator;
     68     }
     69 
     70     @Override
     71     public boolean equals(Object obj) {
     72         if (obj == null) {
     73             return false;
     74         }
     75         if (this == obj) {
     76             return true;
     77         }
     78         if (obj instanceof Rational) {
     79             Rational data = (Rational) obj;
     80             return mNumerator == data.mNumerator && mDenominator == data.mDenominator;
     81         }
     82         return false;
     83     }
     84 
     85     @Override
     86     public String toString() {
     87         return mNumerator + "/" + mDenominator;
     88     }
     89 }
     90