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      */
Rational(long nominator, long denominator)34     public Rational(long nominator, long denominator) {
35         mNumerator = nominator;
36         mDenominator = denominator;
37     }
38 
39     /**
40      * Create a copy of a Rational.
41      */
Rational(Rational r)42     public Rational(Rational r) {
43         mNumerator = r.mNumerator;
44         mDenominator = r.mDenominator;
45     }
46 
47     /**
48      * Gets the numerator of the rational.
49      */
getNumerator()50     public long getNumerator() {
51         return mNumerator;
52     }
53 
54     /**
55      * Gets the denominator of the rational
56      */
getDenominator()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      */
toDouble()65     public double toDouble() {
66         return mNumerator / (double) mDenominator;
67     }
68 
69     @Override
equals(Object obj)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
toString()85     public String toString() {
86         return mNumerator + "/" + mDenominator;
87     }
88 }
89