NumbersTests.java example

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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.common;

import org.elasticsearch.test.ESTestCase;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.concurrent.atomic.AtomicInteger;

public class NumbersTests extends ESTestCase {

    public void testToLongExact() {
        assertEquals(3L, Numbers.toLongExact(Long.valueOf(3L)));
        assertEquals(3L, Numbers.toLongExact(Integer.valueOf(3)));
        assertEquals(3L, Numbers.toLongExact(Short.valueOf((short) 3)));
        assertEquals(3L, Numbers.toLongExact(Byte.valueOf((byte) 3)));
        assertEquals(3L, Numbers.toLongExact(3d));
        assertEquals(3L, Numbers.toLongExact(3f));
        assertEquals(3L, Numbers.toLongExact(BigInteger.valueOf(3L)));
        assertEquals(3L, Numbers.toLongExact(BigDecimal.valueOf(3L)));

        IllegalArgumentException e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(3.1d));
        assertEquals("3.1 is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.NaN));
        assertEquals("NaN is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.POSITIVE_INFINITY));
        assertEquals("Infinity is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(3.1f));
        assertEquals("3.1 is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(new AtomicInteger(3))); // not supported
        assertEquals("Cannot check whether [3] of class [java.util.concurrent.atomic.AtomicInteger] is actually a long", e.getMessage());
    }

    public void testToIntExact() {
        assertEquals(3L, Numbers.toIntExact(Long.valueOf(3L)));
        assertEquals(3L, Numbers.toIntExact(Integer.valueOf(3)));
        assertEquals(3L, Numbers.toIntExact(Short.valueOf((short) 3)));
        assertEquals(3L, Numbers.toIntExact(Byte.valueOf((byte) 3)));
        assertEquals(3L, Numbers.toIntExact(3d));
        assertEquals(3L, Numbers.toIntExact(3f));
        assertEquals(3L, Numbers.toIntExact(BigInteger.valueOf(3L)));
        assertEquals(3L, Numbers.toIntExact(BigDecimal.valueOf(3L)));

        IllegalArgumentException e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toIntExact(3.1d));
        assertEquals("3.1 is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.NaN));
        assertEquals("NaN is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.POSITIVE_INFINITY));
        assertEquals("Infinity is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toIntExact(3.1f));
        assertEquals("3.1 is not an integer value", e.getMessage());
        ArithmeticException ae = expectThrows(ArithmeticException.class,
                () -> Numbers.toIntExact(1L << 40));
        assertEquals("integer overflow", ae.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toIntExact(new AtomicInteger(3))); // not supported
        assertEquals("Cannot check whether [3] of class [java.util.concurrent.atomic.AtomicInteger] is actually a long", e.getMessage());
    }

    public void testToShortExact() {
        assertEquals(3L, Numbers.toShortExact(Long.valueOf(3L)));
        assertEquals(3L, Numbers.toShortExact(Integer.valueOf(3)));
        assertEquals(3L, Numbers.toShortExact(Short.valueOf((short) 3)));
        assertEquals(3L, Numbers.toShortExact(Byte.valueOf((byte) 3)));
        assertEquals(3L, Numbers.toShortExact(3d));
        assertEquals(3L, Numbers.toShortExact(3f));
        assertEquals(3L, Numbers.toShortExact(BigInteger.valueOf(3L)));
        assertEquals(3L, Numbers.toShortExact(BigDecimal.valueOf(3L)));

        IllegalArgumentException e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toShortExact(3.1d));
        assertEquals("3.1 is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.NaN));
        assertEquals("NaN is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.POSITIVE_INFINITY));
        assertEquals("Infinity is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toShortExact(3.1f));
        assertEquals("3.1 is not an integer value", e.getMessage());
        ArithmeticException ae = expectThrows(ArithmeticException.class,
                () -> Numbers.toShortExact(100000));
        assertEquals("short overflow: " + 100000, ae.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toShortExact(new AtomicInteger(3))); // not supported
        assertEquals("Cannot check whether [3] of class [java.util.concurrent.atomic.AtomicInteger] is actually a long", e.getMessage());
    }

    public void testToByteExact() {
        assertEquals(3L, Numbers.toByteExact(Long.valueOf(3L)));
        assertEquals(3L, Numbers.toByteExact(Integer.valueOf(3)));
        assertEquals(3L, Numbers.toByteExact(Short.valueOf((short) 3)));
        assertEquals(3L, Numbers.toByteExact(Byte.valueOf((byte) 3)));
        assertEquals(3L, Numbers.toByteExact(3d));
        assertEquals(3L, Numbers.toByteExact(3f));
        assertEquals(3L, Numbers.toByteExact(BigInteger.valueOf(3L)));
        assertEquals(3L, Numbers.toByteExact(BigDecimal.valueOf(3L)));

        IllegalArgumentException e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toByteExact(3.1d));
        assertEquals("3.1 is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.NaN));
        assertEquals("NaN is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toLongExact(Double.POSITIVE_INFINITY));
        assertEquals("Infinity is not an integer value", e.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toByteExact(3.1f));
        assertEquals("3.1 is not an integer value", e.getMessage());
        ArithmeticException ae = expectThrows(ArithmeticException.class,
                () -> Numbers.toByteExact(300));
        assertEquals("byte overflow: " + 300, ae.getMessage());
        e = expectThrows(IllegalArgumentException.class,
                () -> Numbers.toByteExact(new AtomicInteger(3))); // not supported
        assertEquals("Cannot check whether [3] of class [java.util.concurrent.atomic.AtomicInteger] is actually a long", e.getMessage());
    }
}