package com.fasterxml.jackson.databind.deser;
import java.io.IOException;
import java.util.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.deser.BeanDeserializer;
import com.fasterxml.jackson.databind.deser.BeanDeserializerBuilder;
import com.fasterxml.jackson.databind.deser.BeanDeserializerModifier;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.type.ArrayType;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.fasterxml.jackson.databind.type.MapType;
@SuppressWarnings("serial")
public class TestBeanDeserializer extends BaseMapTest
{
/*
/**********************************************************
/* Helper types
/**********************************************************
*/
static class Bean {
public String b = "b";
public String a = "a";
public Bean() { }
public Bean(String a, String b) {
this.a = a;
this.b = b;
}
}
static class ModuleImpl extends SimpleModule
{
protected BeanDeserializerModifier modifier;
public ModuleImpl(BeanDeserializerModifier modifier)
{
super("test", Version.unknownVersion());
this.modifier = modifier;
}
@Override
public void setupModule(SetupContext context)
{
super.setupModule(context);
if (modifier != null) {
context.addBeanDeserializerModifier(modifier);
}
}
}
static class RemovingModifier extends BeanDeserializerModifier
{
private final String _removedProperty;
public RemovingModifier(String remove) { _removedProperty = remove; }
@Override
public BeanDeserializerBuilder updateBuilder(DeserializationConfig config,
BeanDescription beanDesc, BeanDeserializerBuilder builder) {
builder.addIgnorable(_removedProperty);
return builder;
}
}
static class ReplacingModifier extends BeanDeserializerModifier
{
private final JsonDeserializer<?> _deserializer;
public ReplacingModifier(JsonDeserializer<?> s) { _deserializer = s; }
@Override
public JsonDeserializer<?> modifyDeserializer(DeserializationConfig config,
BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
return _deserializer;
}
}
static class BogusBeanDeserializer extends JsonDeserializer<Object>
{
private final String a, b;
public BogusBeanDeserializer(String a, String b) {
this.a = a;
this.b = b;
}
@Override
public Object deserialize(JsonParser jp, DeserializationContext ctxt)
throws IOException, JsonProcessingException
{
return new Bean(a, b);
}
}
static class Issue476Bean {
public Issue476Type value1, value2;
}
static class Issue476Type {
public String name, value;
}
static class Issue476Deserializer extends BeanDeserializer
implements ContextualDeserializer
{
protected static int propCount;
public Issue476Deserializer(BeanDeserializer src) {
super(src);
}
@Override
public JsonDeserializer<?> createContextual(DeserializationContext ctxt,
BeanProperty property) throws JsonMappingException {
propCount++;
return this;
}
}
public class Issue476DeserializerModifier extends BeanDeserializerModifier {
@Override
public JsonDeserializer<?> modifyDeserializer(DeserializationConfig config,
BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
if (Issue476Type.class == beanDesc.getBeanClass()) {
return new Issue476Deserializer((BeanDeserializer)deserializer);
}
return super.modifyDeserializer(config, beanDesc, deserializer);
}
}
public class Issue476Module extends SimpleModule
{
public Issue476Module() {
super("Issue476Module", Version.unknownVersion());
}
@Override
public void setupModule(SetupContext context) {
context.addBeanDeserializerModifier(new Issue476DeserializerModifier());
}
}
// [Issue#121], arrays, collections, maps
enum EnumABC { A, B, C; }
static class ArrayDeserializerModifier extends BeanDeserializerModifier {
@Override
public JsonDeserializer<?> modifyArrayDeserializer(DeserializationConfig config, ArrayType valueType,
BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
return (JsonDeserializer<?>) new StdDeserializer<Object>(Object.class) {
@Override public Object deserialize(JsonParser jp,
DeserializationContext ctxt) {
return new String[] { "foo" };
}
};
}
}
static class CollectionDeserializerModifier extends BeanDeserializerModifier {
@Override
public JsonDeserializer<?> modifyCollectionDeserializer(DeserializationConfig config, CollectionType valueType,
BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
return (JsonDeserializer<?>) new StdDeserializer<Object>(Object.class) {
@Override public Object deserialize(JsonParser jp,
DeserializationContext ctxt) {
ArrayList<String> list = new ArrayList<String>();
list.add("foo");
return list;
}
};
}
}
static class MapDeserializerModifier extends BeanDeserializerModifier {
@Override
public JsonDeserializer<?> modifyMapDeserializer(DeserializationConfig config, MapType valueType,
BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
return (JsonDeserializer<?>) new StdDeserializer<Object>(Object.class) {
@Override public Object deserialize(JsonParser jp,
DeserializationContext ctxt) {
HashMap<String,String> map = new HashMap<String,String>();
map.put("a", "foo");
return map;
}
};
}
}
static class EnumDeserializerModifier extends BeanDeserializerModifier {
@Override
public JsonDeserializer<?> modifyEnumDeserializer(DeserializationConfig config, JavaType valueType,
BeanDescription beanDesc, JsonDeserializer<?> deserializer) {
return (JsonDeserializer<?>) new StdDeserializer<Object>(Object.class) {
@Override public Object deserialize(JsonParser jp,
DeserializationContext ctxt) {
return "foo";
}
};
}
}
static class KeyDeserializerModifier extends BeanDeserializerModifier {
@Override
public KeyDeserializer modifyKeyDeserializer(DeserializationConfig config, JavaType valueType,
KeyDeserializer kd) {
return new KeyDeserializer() {
@Override
public Object deserializeKey(String key,
DeserializationContext ctxt) throws IOException,
JsonProcessingException {
return "foo";
}
};
}
}
/*
/********************************************************
/* Unit tests
/********************************************************
*/
private final ObjectMapper MAPPER = new ObjectMapper();
public void testPropertyRemoval() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new ModuleImpl(new RemovingModifier("a")));
Bean bean = mapper.readValue("{\"b\":\"2\"}", Bean.class);
assertEquals("2", bean.b);
// and 'a' has its default value:
assertEquals("a", bean.a);
}
public void testDeserializerReplacement() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new ModuleImpl(new ReplacingModifier(new BogusBeanDeserializer("foo", "bar"))));
Bean bean = mapper.readValue("{\"a\":\"xyz\"}", Bean.class);
// custom deserializer always produces instance like this:
assertEquals("foo", bean.a);
assertEquals("bar", bean.b);
}
public void testIssue476() throws Exception
{
final String JSON = "{\"value1\" : {\"name\" : \"fruit\", \"value\" : \"apple\"}, \"value2\" : {\"name\" : \"color\", \"value\" : \"red\"}}";
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new Issue476Module());
mapper.readValue(JSON, Issue476Bean.class);
// there are 2 properties
assertEquals(2, Issue476Deserializer.propCount);
}
public void testPOJOFromEmptyString() throws Exception
{
// first, verify default settings which do not accept empty String:
assertFalse(MAPPER.isEnabled(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT));
try {
MAPPER.readValue(quote(""), Bean.class);
fail("Should not accept Empty String for POJO");
} catch (JsonProcessingException e) {
verifyException(e, "from String value");
assertValidLocation(e.getLocation());
}
// should be ok to enable dynamically
ObjectReader r = MAPPER.reader(Bean.class)
.with(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
Bean result = r.readValue(quote(""));
assertNull(result);
}
// [Databind#540]
public void testPOJOFromEmptyArray() throws Exception
{
final String JSON = " [\n]";
assertFalse(MAPPER.isEnabled(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT));
// first, verify default settings which do not accept empty Array
ObjectMapper mapper = new ObjectMapper();
try {
mapper.readValue(JSON, Bean.class);
fail("Should not accept Empty Array for POJO by default");
} catch (JsonProcessingException e) {
verifyException(e, "START_ARRAY token");
assertValidLocation(e.getLocation());
}
// should be ok to enable dynamically:
ObjectReader r = MAPPER.reader(Bean.class)
.with(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
Bean result = r.readValue(JSON);
assertNull(result);
}
// [Issue#120]
public void testModifyArrayDeserializer() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new SimpleModule("test")
.setDeserializerModifier(new ArrayDeserializerModifier()));
Object[] result = mapper.readValue("[1,2]", Object[].class);
assertEquals(1, result.length);
assertEquals("foo", result[0]);
}
public void testModifyCollectionDeserializer() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new SimpleModule("test")
.setDeserializerModifier(new CollectionDeserializerModifier())
);
List<?> result = mapper.readValue("[1,2]", List.class);
assertEquals(1, result.size());
assertEquals("foo", result.get(0));
}
public void testModifyMapDeserializer() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new SimpleModule("test")
.setDeserializerModifier(new MapDeserializerModifier())
);
Map<?,?> result = mapper.readValue("{\"a\":1,\"b\":2}", Map.class);
assertEquals(1, result.size());
assertEquals("foo", result.get("a"));
}
public void testModifyEnumDeserializer() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new SimpleModule("test")
.setDeserializerModifier(new EnumDeserializerModifier())
);
Object result = mapper.readValue(quote("B"), EnumABC.class);
assertEquals("foo", result);
}
public void testModifyKeyDeserializer() throws Exception
{
ObjectMapper mapper = new ObjectMapper();
mapper.registerModule(new SimpleModule("test")
.setDeserializerModifier(new KeyDeserializerModifier())
);
Map<?,?> result = mapper.readValue("{\"a\":1}", Map.class);
assertEquals(1, result.size());
assertEquals("foo", result.entrySet().iterator().next().getKey());
}
}