/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.math4.fraction;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.NumberFormat;
import java.util.Locale;
import org.apache.commons.math4.exception.MathParseException;
import org.apache.commons.math4.fraction.BigFraction;
import org.apache.commons.math4.fraction.BigFractionFormat;
import org.apache.commons.math4.fraction.ProperBigFractionFormat;
import org.apache.commons.math4.util.FastMath;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
public class BigFractionFormatTest {
BigFractionFormat properFormat = null;
BigFractionFormat improperFormat = null;
protected Locale getLocale() {
return Locale.getDefault();
}
@Before
public void setUp() {
properFormat = BigFractionFormat.getProperInstance(getLocale());
improperFormat = BigFractionFormat.getImproperInstance(getLocale());
}
@Test
public void testFormat() {
BigFraction c = new BigFraction(1, 2);
String expected = "1 / 2";
String actual = properFormat.format(c);
Assert.assertEquals(expected, actual);
actual = improperFormat.format(c);
Assert.assertEquals(expected, actual);
}
@Test
public void testFormatNegative() {
BigFraction c = new BigFraction(-1, 2);
String expected = "-1 / 2";
String actual = properFormat.format(c);
Assert.assertEquals(expected, actual);
actual = improperFormat.format(c);
Assert.assertEquals(expected, actual);
}
@Test
public void testFormatZero() {
BigFraction c = new BigFraction(0, 1);
String expected = "0 / 1";
String actual = properFormat.format(c);
Assert.assertEquals(expected, actual);
actual = improperFormat.format(c);
Assert.assertEquals(expected, actual);
}
@Test
public void testFormatImproper() {
BigFraction c = new BigFraction(5, 3);
String actual = properFormat.format(c);
Assert.assertEquals("1 2 / 3", actual);
actual = improperFormat.format(c);
Assert.assertEquals("5 / 3", actual);
}
@Test
public void testFormatImproperNegative() {
BigFraction c = new BigFraction(-5, 3);
String actual = properFormat.format(c);
Assert.assertEquals("-1 2 / 3", actual);
actual = improperFormat.format(c);
Assert.assertEquals("-5 / 3", actual);
}
@Test
public void testParse() {
String source = "1 / 2";
{
BigFraction c = properFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(BigInteger.ONE, c.getNumerator());
Assert.assertEquals(BigInteger.valueOf(2l), c.getDenominator());
c = improperFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(BigInteger.ONE, c.getNumerator());
Assert.assertEquals(BigInteger.valueOf(2l), c.getDenominator());
}
}
@Test
public void testParseInteger() {
String source = "10";
{
BigFraction c = properFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(BigInteger.TEN, c.getNumerator());
Assert.assertEquals(BigInteger.ONE, c.getDenominator());
}
{
BigFraction c = improperFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(BigInteger.TEN, c.getNumerator());
Assert.assertEquals(BigInteger.ONE, c.getDenominator());
}
}
@Test
public void testParseInvalid() {
String source = "a";
String msg = "should not be able to parse '10 / a'.";
try {
properFormat.parse(source);
Assert.fail(msg);
} catch (MathParseException ex) {
// success
}
try {
improperFormat.parse(source);
Assert.fail(msg);
} catch (MathParseException ex) {
// success
}
}
@Test
public void testParseInvalidDenominator() {
String source = "10 / a";
String msg = "should not be able to parse '10 / a'.";
try {
properFormat.parse(source);
Assert.fail(msg);
} catch (MathParseException ex) {
// success
}
try {
improperFormat.parse(source);
Assert.fail(msg);
} catch (MathParseException ex) {
// success
}
}
@Test
public void testParseNegative() {
{
String source = "-1 / 2";
BigFraction c = properFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(-1, c.getNumeratorAsInt());
Assert.assertEquals(2, c.getDenominatorAsInt());
c = improperFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(-1, c.getNumeratorAsInt());
Assert.assertEquals(2, c.getDenominatorAsInt());
source = "1 / -2";
c = properFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(-1, c.getNumeratorAsInt());
Assert.assertEquals(2, c.getDenominatorAsInt());
c = improperFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(-1, c.getNumeratorAsInt());
Assert.assertEquals(2, c.getDenominatorAsInt());
}
}
@Test
public void testParseProper() {
String source = "1 2 / 3";
{
BigFraction c = properFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(5, c.getNumeratorAsInt());
Assert.assertEquals(3, c.getDenominatorAsInt());
}
try {
improperFormat.parse(source);
Assert.fail("invalid improper fraction.");
} catch (MathParseException ex) {
// success
}
}
@Test
public void testParseProperNegative() {
String source = "-1 2 / 3";
{
BigFraction c = properFormat.parse(source);
Assert.assertNotNull(c);
Assert.assertEquals(-5, c.getNumeratorAsInt());
Assert.assertEquals(3, c.getDenominatorAsInt());
}
try {
improperFormat.parse(source);
Assert.fail("invalid improper fraction.");
} catch (MathParseException ex) {
// success
}
}
@Test
public void testParseProperInvalidMinus() {
String source = "2 -2 / 3";
try {
properFormat.parse(source);
Assert.fail("invalid minus in improper fraction.");
} catch (MathParseException ex) {
// expected
}
source = "2 2 / -3";
try {
properFormat.parse(source);
Assert.fail("invalid minus in improper fraction.");
} catch (MathParseException ex) {
// expected
}
}
@Test
public void testParseBig() {
BigFraction f1 =
improperFormat.parse("167213075789791382630275400487886041651764456874403" +
" / " +
"53225575123090058458126718248444563466137046489291");
Assert.assertEquals(FastMath.PI, f1.doubleValue(), 0.0);
BigFraction f2 =
properFormat.parse("3 " +
"7536350420521207255895245742552351253353317406530" +
" / " +
"53225575123090058458126718248444563466137046489291");
Assert.assertEquals(FastMath.PI, f2.doubleValue(), 0.0);
Assert.assertEquals(f1, f2);
BigDecimal pi =
new BigDecimal("3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117068");
Assert.assertEquals(pi, f1.bigDecimalValue(99, BigDecimal.ROUND_HALF_EVEN));
}
@Test
public void testNumeratorFormat() {
NumberFormat old = properFormat.getNumeratorFormat();
NumberFormat nf = NumberFormat.getInstance();
nf.setParseIntegerOnly(true);
properFormat.setNumeratorFormat(nf);
Assert.assertEquals(nf, properFormat.getNumeratorFormat());
properFormat.setNumeratorFormat(old);
old = improperFormat.getNumeratorFormat();
nf = NumberFormat.getInstance();
nf.setParseIntegerOnly(true);
improperFormat.setNumeratorFormat(nf);
Assert.assertEquals(nf, improperFormat.getNumeratorFormat());
improperFormat.setNumeratorFormat(old);
}
@Test
public void testDenominatorFormat() {
NumberFormat old = properFormat.getDenominatorFormat();
NumberFormat nf = NumberFormat.getInstance();
nf.setParseIntegerOnly(true);
properFormat.setDenominatorFormat(nf);
Assert.assertEquals(nf, properFormat.getDenominatorFormat());
properFormat.setDenominatorFormat(old);
old = improperFormat.getDenominatorFormat();
nf = NumberFormat.getInstance();
nf.setParseIntegerOnly(true);
improperFormat.setDenominatorFormat(nf);
Assert.assertEquals(nf, improperFormat.getDenominatorFormat());
improperFormat.setDenominatorFormat(old);
}
@Test
public void testWholeFormat() {
ProperBigFractionFormat format = (ProperBigFractionFormat)properFormat;
NumberFormat old = format.getWholeFormat();
NumberFormat nf = NumberFormat.getInstance();
nf.setParseIntegerOnly(true);
format.setWholeFormat(nf);
Assert.assertEquals(nf, format.getWholeFormat());
format.setWholeFormat(old);
}
@Test
public void testLongFormat() {
Assert.assertEquals("10 / 1", improperFormat.format(10l));
}
@Test
public void testDoubleFormat() {
Assert.assertEquals("1 / 16", improperFormat.format(0.0625));
}
}