Class ObjectCodec

java.lang.Object

org.codehaus.jackson.ObjectCodec

Direct Known Subclasses:

ObjectMapper, ObjectReader

public abstract class ObjectCodec
extends Object

Abstract class that defines the interface that JsonParser and JsonGenerator use to serialize and deserialize regular Java objects (POJOs aka Beans).

The standard implementation of this class is ObjectMapper.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ObjectCodec()

Method Summary

Modifier and Type	Method	Description
abstract JsonNode	createArrayNode()	Method for construct root level Array nodes for Tree Model instances.
abstract JsonNode	createObjectNode()	Method for construct root level Object nodes for Tree Model instances.
abstract JsonNode	readTree(JsonParser jp)	Method to deserialize JSON content as tree expressed using set of JsonNode instances.
abstract <T> T	readValue(JsonParser jp, Class<T> valueType)	Method to deserialize JSON content into a non-container type (it can be an array type, however): typically a bean, array or a wrapper type (like Boolean).
abstract <T> T	readValue(JsonParser jp, JavaType valueType)	Method to deserialize JSON content as tree expressed using set of JsonNode instances.
abstract <T> T	readValue(JsonParser jp, TypeReference<?> valueTypeRef)	Method to deserialize JSON content into a Java type, reference to which is passed as argument.
abstract <T> Iterator<T>	readValues(JsonParser jp, Class<T> valueType)	Method for reading sequence of Objects from parser stream, all with same specified value type.
abstract <T> Iterator<T>	readValues(JsonParser jp, JavaType valueType)	Method for reading sequence of Objects from parser stream, all with same specified value type.
abstract <T> Iterator<T>	readValues(JsonParser jp, TypeReference<?> valueTypeRef)	Method for reading sequence of Objects from parser stream, all with same specified value type.
abstract JsonParser	treeAsTokens(JsonNode n)	Method for constructing a JsonParser for reading contents of a JSON tree, as if it was external serialized JSON content.
abstract <T> T	treeToValue(JsonNode n, Class<T> valueType)	Convenience method for converting given JSON tree into instance of specified value type.
abstract void	writeTree(JsonGenerator jgen, JsonNode rootNode)	Method to serialize given Json Tree, using generator provided.
abstract void	writeValue(JsonGenerator jgen, Object value)	Method to serialize given Java Object, using generator provided.

Methods inherited from class Object

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

Constructor Details

ObjectCodec

protected ObjectCodec()

Method Details

readValue

public abstract <T> T readValue(JsonParser jp,
 Class<T> valueType)
                         throws IOException,
JsonProcessingException

Method to deserialize JSON content into a non-container type (it can be an array type, however): typically a bean, array or a wrapper type (like Boolean).

Note: this method should NOT be used if the result type is a container (Collection or Map. The reason is that due to type erasure, key and value types can not be introspected when using this method.

Throws:

IOException

JsonProcessingException

readValue

public abstract <T> T readValue(JsonParser jp,
 TypeReference<?> valueTypeRef)
                         throws IOException,
JsonProcessingException

Method to deserialize JSON content into a Java type, reference to which is passed as argument. Type is passed using so-called "super type token" and specifically needs to be used if the root type is a parameterized (generic) container type.

Throws:

IOException

JsonProcessingException

readValue

public abstract <T> T readValue(JsonParser jp,
 JavaType valueType)
                         throws IOException,
JsonProcessingException

Method to deserialize JSON content as tree expressed using set of JsonNode instances. Returns root of the resulting tree (where root can consist of just a single node if the current event is a value event, not container).

Throws:

IOException

JsonProcessingException

readTree

public abstract JsonNode readTree(JsonParser jp)
                           throws IOException,
JsonProcessingException

Method to deserialize JSON content as tree expressed using set of JsonNode instances. Returns root of the resulting tree (where root can consist of just a single node if the current event is a value event, not container).

Throws:

IOException

JsonProcessingException

readValues

public abstract <T> Iterator<T> readValues(JsonParser jp,
 Class<T> valueType)
                                    throws IOException,
JsonProcessingException

Method for reading sequence of Objects from parser stream, all with same specified value type.

Throws:

IOException

JsonProcessingException

Since:

1.9

readValues

public abstract <T> Iterator<T> readValues(JsonParser jp,
 TypeReference<?> valueTypeRef)
                                    throws IOException,
JsonProcessingException

Method for reading sequence of Objects from parser stream, all with same specified value type.

Throws:

IOException

JsonProcessingException

Since:

1.9

readValues

public abstract <T> Iterator<T> readValues(JsonParser jp,
 JavaType valueType)
                                    throws IOException,
JsonProcessingException

Method for reading sequence of Objects from parser stream, all with same specified value type.

Throws:

IOException

JsonProcessingException

Since:

1.9

writeValue

public abstract void writeValue(JsonGenerator jgen,
 Object value)
                         throws IOException,
JsonProcessingException

Method to serialize given Java Object, using generator provided.

Throws:

IOException

JsonProcessingException

writeTree

public abstract void writeTree(JsonGenerator jgen,
 JsonNode rootNode)
                        throws IOException,
JsonProcessingException

Method to serialize given Json Tree, using generator provided.

Throws:

IOException

JsonProcessingException

createObjectNode

public abstract JsonNode createObjectNode()

Method for construct root level Object nodes for Tree Model instances.

Since:

1.2

createArrayNode

public abstract JsonNode createArrayNode()

Method for construct root level Array nodes for Tree Model instances.

Since:

1.2

treeAsTokens

public abstract JsonParser treeAsTokens(JsonNode n)

Method for constructing a JsonParser for reading contents of a JSON tree, as if it was external serialized JSON content.

Since:

1.3

treeToValue

public abstract <T> T treeToValue(JsonNode n,
 Class<T> valueType)
                           throws IOException,
JsonProcessingException

Convenience method for converting given JSON tree into instance of specified value type. This is equivalent to first constructing a JsonParser to iterate over contents of the tree, and using that parser for data binding.

Throws:

IOException

JsonProcessingException

Since:

1.3