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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.gallery3d.exif;
     18 
     19 /**
     20  * The rational data type of EXIF tag. Contains a pair of longs representing the
     21  * numerator and denominator of a Rational number.
     22  */
     23 public class Rational {
     24 
     25     private final long mNumerator;
     26     private final long mDenominator;
     27 
     28     /**
     29      * Create a Rational with a given numerator and denominator.
     30      *
     31      * @param nominator
     32      * @param denominator
     33      */
     34     public Rational(long nominator, long denominator) {
     35         mNumerator = nominator;
     36         mDenominator = denominator;
     37     }
     38 
     39     /**
     40      * Create a copy of a Rational.
     41      */
     42     public Rational(Rational r) {
     43         mNumerator = r.mNumerator;
     44         mDenominator = r.mDenominator;
     45     }
     46 
     47     /**
     48      * Gets the numerator of the rational.
     49      */
     50     public long getNumerator() {
     51         return mNumerator;
     52     }
     53 
     54     /**
     55      * Gets the denominator of the rational
     56      */
     57     public long getDenominator() {
     58         return mDenominator;
     59     }
     60 
     61     /**
     62      * Gets the rational value as type double. Will cause a divide-by-zero error
     63      * if the denominator is 0.
     64      */
     65     public double toDouble() {
     66         return mNumerator / (double) mDenominator;
     67     }
     68 
     69     @Override
     70     public boolean equals(Object obj) {
     71         if (obj == null) {
     72             return false;
     73         }
     74         if (this == obj) {
     75             return true;
     76         }
     77         if (obj instanceof Rational) {
     78             Rational data = (Rational) obj;
     79             return mNumerator == data.mNumerator && mDenominator == data.mDenominator;
     80         }
     81         return false;
     82     }
     83 
     84     @Override
     85     public String toString() {
     86         return mNumerator + "/" + mDenominator;
     87     }
     88 }
     89