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package com.fasterxml.jackson.databind.struct;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.*;
/**
* Tests to verify implementation of [databind#540]; also for
* follow up work of:
*
* - [databind#994]
*/
public class EmptyArrayAsNullTest extends BaseMapTest
{
private final ObjectMapper MAPPER = new ObjectMapper();
private final ObjectReader DEFAULT_READER = MAPPER.reader();
private final ObjectReader READER_WITH_ARRAYS = DEFAULT_READER
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
static class Bean {
public String a = "foo";
}
final static String EMPTY_ARRAY = " [\n]";
/*
/**********************************************************
/* Test methods, settings
/**********************************************************
*/
public void testSettings() {
assertFalse(MAPPER.isEnabled(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT));
assertFalse(DEFAULT_READER.isEnabled(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT));
assertTrue(READER_WITH_ARRAYS.isEnabled(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT));
}
/*
/**********************************************************
/* Test methods, POJOs
/**********************************************************
*/
// [databind#540]
public void testPOJOFromEmptyArray() throws Exception
{
// first, verify default settings which do not accept empty Array
try {
DEFAULT_READER.forType(Bean.class)
.readValue(EMPTY_ARRAY);
fail("Should not accept Empty Array for POJO by default");
} catch (JsonMappingException e) {
verifyException(e, "START_ARRAY token");
assertValidLocation(e.getLocation());
}
// should be ok to enable dynamically:
Bean result = READER_WITH_ARRAYS.forType(Bean.class)
.readValue(EMPTY_ARRAY);
assertNull(result);
}
/*
/**********************************************************
/* Test methods, Maps
/**********************************************************
*/
public void testMapFromEmptyArray() throws Exception
{
// first, verify default settings which do not accept empty Array
try {
DEFAULT_READER.forType(Map.class)
.readValue(EMPTY_ARRAY);
fail("Should not accept Empty Array for Map by default");
} catch (JsonMappingException e) {
verifyException(e, "START_ARRAY token");
}
// should be ok to enable dynamically:
Map<?,?> result = READER_WITH_ARRAYS.forType(Map.class)
.readValue(EMPTY_ARRAY);
assertNull(result);
}
public void testEnumMapFromEmptyArray() throws Exception
{
EnumMap<?,?> result2 = READER_WITH_ARRAYS.forType(new TypeReference<EnumMap<ABC,String>>() { })
.readValue(EMPTY_ARRAY);
assertNull(result2);
}
/*
/**********************************************************
/* Test methods, primitives/wrappers
/**********************************************************
*/
public void testWrapperFromEmptyArray() throws Exception
{
_testNullWrapper(Boolean.class);
_testNullWrapper(Byte.class);
_testNullWrapper(Character.class);
_testNullWrapper(Short.class);
_testNullWrapper(Integer.class);
_testNullWrapper(Long.class);
_testNullWrapper(Float.class);
_testNullWrapper(Double.class);
}
/*
/**********************************************************
/* Test methods, other
/**********************************************************
*/
public void testNullStringFromEmptyArray() throws Exception {
_testNullWrapper(String.class);
}
public void testNullEnumFromEmptyArray() throws Exception {
_testNullWrapper(ABC.class);
}
public void testStdJdkTypesFromEmptyArray() throws Exception
{
_testNullWrapper(BigInteger.class);
_testNullWrapper(BigDecimal.class);
_testNullWrapper(UUID.class);
_testNullWrapper(Date.class);
_testNullWrapper(Calendar.class);
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
private void _testNullWrapper(Class<?> cls) throws Exception
{
Object result = READER_WITH_ARRAYS.forType(cls).readValue(EMPTY_ARRAY);
assertNull(result);
}
}
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