Package org.apache.druid.java.util.common.jackson

Class JacksonUtils

java.lang.Object

org.apache.druid.java.util.common.jackson.JacksonUtils

public final class JacksonUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final com.fasterxml.jackson.core.type.TypeReference<Map<String,Boolean>>	TYPE_REFERENCE_MAP_STRING_BOOLEAN
static final com.fasterxml.jackson.core.type.TypeReference<Map<String,Object>>	TYPE_REFERENCE_MAP_STRING_OBJECT
static final com.fasterxml.jackson.core.type.TypeReference<Map<String,String>>	TYPE_REFERENCE_MAP_STRING_STRING

Method Summary

Modifier and Type	Method	Description
static com.fasterxml.jackson.databind.JsonSerializer<Object>	getSerializer(com.fasterxml.jackson.databind.SerializerProvider serializerProvider, Class<?> clazz)	Returns a serializer for a particular class.
static Object	readObjectUsingDeserializationContext(com.fasterxml.jackson.core.JsonParser jp, com.fasterxml.jackson.databind.DeserializationContext deserializationContext, com.fasterxml.jackson.databind.JavaType javaType)
static <T> T	readObjectUsingDeserializationContext(com.fasterxml.jackson.core.JsonParser jp, com.fasterxml.jackson.databind.DeserializationContext deserializationContext, Class<T> clazz)	Reads an object using the JsonParser.
static <T> T	readValue(com.fasterxml.jackson.databind.ObjectMapper mapper, byte[] bytes, com.fasterxml.jackson.core.type.TypeReference<T> valueType)	Silences Jackson's IOException.
static <T> T	readValue(com.fasterxml.jackson.databind.ObjectMapper mapper, byte[] bytes, com.fasterxml.jackson.databind.JavaType valueType)	Silences Jackson's IOException.
static <T> T	readValue(com.fasterxml.jackson.databind.ObjectMapper mapper, byte[] bytes, Class<T> valueType)	Silences Jackson's IOException.
static byte[]	toBytes(com.fasterxml.jackson.databind.ObjectMapper jsonMapper, Object obj)	Convert the given object to an array of bytes.
static void	writeObjectUsingSerializerProvider(com.fasterxml.jackson.core.JsonGenerator jsonGenerator, com.fasterxml.jackson.databind.SerializerProvider serializers, Object o)	Serializes an object using a JsonGenerator.
static String	writeValueAsString(com.fasterxml.jackson.databind.ObjectMapper jsonMapper, Object value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

TYPE_REFERENCE_MAP_STRING_OBJECT

public static final com.fasterxml.jackson.core.type.TypeReference<Map<String,Object>> TYPE_REFERENCE_MAP_STRING_OBJECT

TYPE_REFERENCE_MAP_STRING_STRING

public static final com.fasterxml.jackson.core.type.TypeReference<Map<String,String>> TYPE_REFERENCE_MAP_STRING_STRING

TYPE_REFERENCE_MAP_STRING_BOOLEAN

public static final com.fasterxml.jackson.core.type.TypeReference<Map<String,Boolean>> TYPE_REFERENCE_MAP_STRING_BOOLEAN

Method Details

readValue

public static <T> T readValue(com.fasterxml.jackson.databind.ObjectMapper mapper,
 byte[] bytes,
 Class<T> valueType)

Silences Jackson's IOException.

readValue

public static <T> T readValue(com.fasterxml.jackson.databind.ObjectMapper mapper,
 byte[] bytes,
 com.fasterxml.jackson.databind.JavaType valueType)

Silences Jackson's IOException.

readValue

public static <T> T readValue(com.fasterxml.jackson.databind.ObjectMapper mapper,
 byte[] bytes,
 com.fasterxml.jackson.core.type.TypeReference<T> valueType)

Silences Jackson's IOException.

getSerializer

public static com.fasterxml.jackson.databind.JsonSerializer<Object> getSerializer(com.fasterxml.jackson.databind.SerializerProvider serializerProvider,
 Class<?> clazz)
                                                                           throws com.fasterxml.jackson.databind.JsonMappingException

Returns a serializer for a particular class. If you have a SerializerProvider, this is better than calling JsonGenerator.writeObject(Object) or ObjectMapper.writeValue(JsonGenerator, Object), because it avoids re-creating the SerializerProvider for each serialized object.

Throws:

com.fasterxml.jackson.databind.JsonMappingException

writeObjectUsingSerializerProvider

public static void writeObjectUsingSerializerProvider(com.fasterxml.jackson.core.JsonGenerator jsonGenerator,
 com.fasterxml.jackson.databind.SerializerProvider serializers,
 @Nullable
 Object o)
                                               throws IOException

Serializes an object using a JsonGenerator. If you have a SerializerProvider, this is better than calling JsonGenerator.writeObject(Object), because it avoids re-creating the SerializerProvider for each serialized object.

Throws:

IOException

writeValueAsString

public static String writeValueAsString(com.fasterxml.jackson.databind.ObjectMapper jsonMapper,
 Object value)
                                 throws DruidException

Throws:

DruidException

readObjectUsingDeserializationContext

@Nullable
public static <T> T readObjectUsingDeserializationContext(com.fasterxml.jackson.core.JsonParser jp,
 com.fasterxml.jackson.databind.DeserializationContext deserializationContext,
 Class<T> clazz)
                                                   throws IOException

Reads an object using the JsonParser. It reuses the provided DeserializationContext which offers better performance that calling JsonParser.readValueAs(Class) because it avoids re-creating the DeserializationContext for each readValue call

Throws:

IOException

readObjectUsingDeserializationContext

@Nullable
public static Object readObjectUsingDeserializationContext(com.fasterxml.jackson.core.JsonParser jp,
 com.fasterxml.jackson.databind.DeserializationContext deserializationContext,
 com.fasterxml.jackson.databind.JavaType javaType)
                                                    throws IOException

Throws:

IOException

See Also:

• readObjectUsingDeserializationContext(JsonParser, DeserializationContext, Class)

toBytes

public static byte[] toBytes(com.fasterxml.jackson.databind.ObjectMapper jsonMapper,
 Object obj)

Convert the given object to an array of bytes. Use when the object is known serializable so that the Jackson exception can be suppressed.