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