1.9.10/src/test/org/codehaus/jackson/map/deser/TestGenericNumber.java

package org.codehaus.jackson.map.deser;

import java.io.*;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;

import org.codehaus.jackson.map.*;

/**
 * Unit tests for verifying handling of non-specific numeric types.
 */
public class TestGenericNumber
    extends BaseMapTest
{
    public void testIntAsNumber() throws Exception
    {
        /* Even if declared as 'generic' type, should return using most
         * efficient type... here, Integer
         */
        Number result = new ObjectMapper().readValue(new StringReader(" 123 "), Number.class);
        assertEquals(Integer.valueOf(123), result);
    }

    public void testLongAsNumber() throws Exception
    {
        // And beyond int range, should get long
        long exp = 1234567890123L;
        Number result = new ObjectMapper().readValue(String.valueOf(exp), Number.class);
        assertEquals(Long.valueOf(exp), result);
    }

    public void testBigIntAsNumber() throws Exception
    {
        // and after long, BigInteger
        BigInteger biggie = new BigInteger("1234567890123456789012345678901234567890");
        Number result = new ObjectMapper().readValue(biggie.toString(), Number.class);
        assertEquals(BigInteger.class, biggie.getClass());
        assertEquals(biggie, result);
    }

    public void testIntTypeOverride() throws Exception
    {
        /* Slight twist; as per [JACKSON-100], can also request binding
         * to BigInteger even if value would fit in Integer
         */
        ObjectMapper m = new ObjectMapper();
        m.enable(DeserializationConfig.Feature.USE_BIG_INTEGER_FOR_INTS);
        BigInteger exp = BigInteger.valueOf(123L);

        // first test as any Number
        Number result = m.readValue(new StringReader(" 123 "), Number.class);
        assertEquals(BigInteger.class, result.getClass());
        assertEquals(exp, result);

        // then as any Object
        /*Object value =*/ m.readValue(new StringReader("123"), Object.class);
        assertEquals(BigInteger.class, result.getClass());
        assertEquals(exp, result);
    }

    /**
     * Related to [JACKSON-72]: by default should wrap floating-point
     * Number as Double
     */
    public void testDoubleAsNumber() throws Exception
    {
        Number result = new ObjectMapper().readValue(new StringReader(" 1.0 "), Number.class);
        assertEquals(Double.valueOf(1.0), result);
    }

    /**
     * Test for verifying [JACKSON-72].
     */
    public void testFpTypeOverrideSimple() throws Exception
    {
        ObjectMapper m = new ObjectMapper();
        m.enable(DeserializationConfig.Feature.USE_BIG_DECIMAL_FOR_FLOATS);
        BigDecimal dec = new BigDecimal("0.1");

        // First test generic stand-alone Number
        Number result = m.readValue(dec.toString(), Number.class);
        assertEquals(BigDecimal.class, result.getClass());
        assertEquals(dec, result);

        // Then plain old Object
        Object value = m.readValue(dec.toString(), Object.class);
        assertEquals(BigDecimal.class, result.getClass());
        assertEquals(dec, value);
    }

	public void testFpTypeOverrideStructured() throws Exception
    {
        ObjectMapper m = new ObjectMapper();
        BigDecimal dec = new BigDecimal("-19.37");

        m.enable(DeserializationConfig.Feature.USE_BIG_DECIMAL_FOR_FLOATS);

        // List element types
        @SuppressWarnings("unchecked")
        List<Object> list = (List<Object>)m.readValue("[ "+dec.toString()+" ]", List.class);
        assertEquals(1, list.size());
        Object val = list.get(0);
        assertEquals(BigDecimal.class, val.getClass());
        assertEquals(dec, val);

        // and a map
        Map<?,?> map = m.readValue("{ \"a\" : "+dec.toString()+" }", Map.class);
        assertEquals(1, map.size());
        val = map.get("a");
        assertEquals(BigDecimal.class, val.getClass());
        assertEquals(dec, val);
    }
}