org.codehaus.jackson.impl
Class JsonGeneratorBase

java.lang.Object
  extended by org.codehaus.jackson.JsonGenerator
      extended by org.codehaus.jackson.impl.JsonGeneratorBase
All Implemented Interfaces:
Closeable
Direct Known Subclasses:
WriterBasedGenerator

public abstract class JsonGeneratorBase
extends JsonGenerator

This base class implements part of API that a JSON generator exposes to applications, adds shared internal methods that sub-classes can use and adds some abstract methods sub-classes must implement.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.codehaus.jackson.JsonGenerator
JsonGenerator.Feature
 
Field Summary
protected  boolean _cfgNumbersAsStrings
          Flag set to indicate that implicit conversion from number to JSON String is needed (as per JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS).
protected  boolean _closed
          Flag that indicates whether generator is closed or not.
protected  int _features
          Bit flag composed of bits that indicate which JsonGenerator.Features are enabled.
protected  ObjectCodec _objectCodec
           
protected  JsonWriteContext _writeContext
          Object that keeps track of the current contextual state of the generator.
 
Fields inherited from class org.codehaus.jackson.JsonGenerator
_cfgPrettyPrinter
 
Constructor Summary
protected JsonGeneratorBase(int features, ObjectCodec codec)
           
 
Method Summary
protected  void _cantHappen()
           
protected abstract  void _releaseBuffers()
           
protected  void _reportError(String msg)
           
protected abstract  void _verifyValueWrite(String typeMsg)
           
protected abstract  void _writeEndArray()
           
protected abstract  void _writeEndObject()
           
protected abstract  void _writeFieldName(String name, boolean commaBefore)
           
protected  void _writeSimpleObject(Object value)
          Helper method to try to call appropriate write method for given untyped Object.
protected abstract  void _writeStartArray()
           
protected abstract  void _writeStartObject()
           
 void close()
          Method called to close this generator, so that no more content can be written.
 void copyCurrentEvent(JsonParser jp)
          Method for copying contents of the current event that the given parser instance points to.
 void copyCurrentStructure(JsonParser jp)
          Method for copying contents of the current event and following events that it encloses the given parser instance points to.
 JsonGenerator disable(JsonGenerator.Feature f)
          Method for disabling specified features (check JsonGenerator.Feature for list of features)
 JsonGenerator enable(JsonGenerator.Feature f)
          Method for enabling specified parser features: check JsonGenerator.Feature for list of available features.
abstract  void flush()
          Method called to flush any buffered content to the underlying target (output stream, writer), and to flush the target itself as well.
 ObjectCodec getCodec()
          Method for accessing the object used for writing Java object as Json content (using method JsonGenerator.writeObject(java.lang.Object)).
 JsonWriteContext getOutputContext()
          Note: co-variant return type.
 boolean isClosed()
          Method that can be called to determine whether this generator is closed or not.
 boolean isEnabled(JsonGenerator.Feature f)
          Method for checking whether given feature is enabled.
 JsonGenerator setCodec(ObjectCodec oc)
          Method that can be called to set or reset the object to use for writing Java objects as JsonContent (using method JsonGenerator.writeObject(java.lang.Object)).
 JsonGenerator useDefaultPrettyPrinter()
          Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter).
abstract  void writeBoolean(boolean state)
          Method for outputting literal Json boolean value (one of Strings 'true' and 'false').
 void writeEndArray()
          Method for writing closing marker of a Json Array value (character ']'; plus possible white space decoration if pretty-printing is enabled).
 void writeEndObject()
          Method for writing closing marker of a Json Object value (character '}'; plus possible white space decoration if pretty-printing is enabled).
 void writeFieldName(String name)
          Method for writing a field name (json String surrounded by double quotes: syntactically identical to a json String value), possibly decorated by white space if pretty-printing is enabled.
abstract  void writeNull()
          Method for outputting literal Json null value.
abstract  void writeNumber(BigDecimal dec)
          Method for outputting indicate Json numeric value.
abstract  void writeNumber(double d)
          Method for outputting indicate Json numeric value.
abstract  void writeNumber(float f)
          Method for outputting indicate Json numeric value.
abstract  void writeNumber(int i)
          Method for outputting given value as Json number.
abstract  void writeNumber(long l)
          Method for outputting given value as Json number.
 void writeObject(Object value)
          Method for writing given Java object (POJO) as Json.
 void writeStartArray()
          Method for writing starting marker of a Json Array value (character '['; plus possible white space decoration if pretty-printing is enabled).
 void writeStartObject()
          Method for writing starting marker of a Json Object value (character '{'; plus possible white space decoration if pretty-printing is enabled).
 void writeTree(JsonNode rootNode)
          Method for writing given Json tree (expressed as a tree where given JsonNode is the root) using this generator.
 
Methods inherited from class org.codehaus.jackson.JsonGenerator
configure, disableFeature, enableFeature, isFeatureEnabled, setFeature, setPrettyPrinter, writeArrayFieldStart, writeBinary, writeBinary, writeBinary, writeBinaryField, writeBooleanField, writeNullField, writeNumber, writeNumber, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeNumberField, writeObjectField, writeObjectFieldStart, writeRaw, writeRaw, writeRaw, writeRaw, writeRawValue, writeRawValue, writeRawValue, writeString, writeString, writeStringField
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

_objectCodec

protected ObjectCodec _objectCodec

_features

protected int _features
Bit flag composed of bits that indicate which JsonGenerator.Features are enabled.


_cfgNumbersAsStrings

protected boolean _cfgNumbersAsStrings
Flag set to indicate that implicit conversion from number to JSON String is needed (as per JsonGenerator.Feature.WRITE_NUMBERS_AS_STRINGS).


_writeContext

protected JsonWriteContext _writeContext
Object that keeps track of the current contextual state of the generator.


_closed

protected boolean _closed
Flag that indicates whether generator is closed or not. Gets set when it is closed by an explicit call (close()).

Constructor Detail

JsonGeneratorBase

protected JsonGeneratorBase(int features,
                            ObjectCodec codec)
Method Detail

enable

public JsonGenerator enable(JsonGenerator.Feature f)
Description copied from class: JsonGenerator
Method for enabling specified parser features: check JsonGenerator.Feature for list of available features.

Specified by:
enable in class JsonGenerator
Returns:
Generator itself (this), to allow chaining

disable

public JsonGenerator disable(JsonGenerator.Feature f)
Description copied from class: JsonGenerator
Method for disabling specified features (check JsonGenerator.Feature for list of features)

Specified by:
disable in class JsonGenerator
Returns:
Generator itself (this), to allow chaining

isEnabled

public final boolean isEnabled(JsonGenerator.Feature f)
Description copied from class: JsonGenerator
Method for checking whether given feature is enabled. Check JsonGenerator.Feature for list of available features.

Specified by:
isEnabled in class JsonGenerator

useDefaultPrettyPrinter

public final JsonGenerator useDefaultPrettyPrinter()
Description copied from class: JsonGenerator
Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter).

Specified by:
useDefaultPrettyPrinter in class JsonGenerator
Returns:
Generator itself (this), to allow chaining

setCodec

public final JsonGenerator setCodec(ObjectCodec oc)
Description copied from class: JsonGenerator
Method that can be called to set or reset the object to use for writing Java objects as JsonContent (using method JsonGenerator.writeObject(java.lang.Object)).

Specified by:
setCodec in class JsonGenerator
Returns:
Generator itself (this), to allow chaining

getCodec

public final ObjectCodec getCodec()
Description copied from class: JsonGenerator
Method for accessing the object used for writing Java object as Json content (using method JsonGenerator.writeObject(java.lang.Object)).

Specified by:
getCodec in class JsonGenerator

getOutputContext

public final JsonWriteContext getOutputContext()
Note: co-variant return type.

Specified by:
getOutputContext in class JsonGenerator
Returns:
Context object that can give information about logical position within generated json content.

writeStartArray

public final void writeStartArray()
                           throws IOException,
                                  JsonGenerationException
Description copied from class: JsonGenerator
Method for writing starting marker of a Json Array value (character '['; plus possible white space decoration if pretty-printing is enabled).

Array values can be written in any context where values are allowed: meaning everywhere except for when a field name is expected.

Specified by:
writeStartArray in class JsonGenerator
Throws:
IOException
JsonGenerationException

_writeStartArray

protected abstract void _writeStartArray()
                                  throws IOException,
                                         JsonGenerationException
Throws:
IOException
JsonGenerationException

writeEndArray

public final void writeEndArray()
                         throws IOException,
                                JsonGenerationException
Description copied from class: JsonGenerator
Method for writing closing marker of a Json Array value (character ']'; plus possible white space decoration if pretty-printing is enabled).

Marker can be written if the innermost structured type is Array.

Specified by:
writeEndArray in class JsonGenerator
Throws:
IOException
JsonGenerationException

_writeEndArray

protected abstract void _writeEndArray()
                                throws IOException,
                                       JsonGenerationException
Throws:
IOException
JsonGenerationException

writeStartObject

public final void writeStartObject()
                            throws IOException,
                                   JsonGenerationException
Description copied from class: JsonGenerator
Method for writing starting marker of a Json Object value (character '{'; plus possible white space decoration if pretty-printing is enabled).

Object values can be written in any context where values are allowed: meaning everywhere except for when a field name is expected.

Specified by:
writeStartObject in class JsonGenerator
Throws:
IOException
JsonGenerationException

_writeStartObject

protected abstract void _writeStartObject()
                                   throws IOException,
                                          JsonGenerationException
Throws:
IOException
JsonGenerationException

writeEndObject

public final void writeEndObject()
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for writing closing marker of a Json Object value (character '}'; plus possible white space decoration if pretty-printing is enabled).

Marker can be written if the innermost structured type is Object, and the last written event was either a complete value, or START-OBJECT marker (see Json specification for more details).

Specified by:
writeEndObject in class JsonGenerator
Throws:
IOException
JsonGenerationException

_writeEndObject

protected abstract void _writeEndObject()
                                 throws IOException,
                                        JsonGenerationException
Throws:
IOException
JsonGenerationException

writeFieldName

public final void writeFieldName(String name)
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for writing a field name (json String surrounded by double quotes: syntactically identical to a json String value), possibly decorated by white space if pretty-printing is enabled.

Field names can only be written in Object context (check out Json specification for details), when field name is expected (field names alternate with values).

Specified by:
writeFieldName in class JsonGenerator
Throws:
IOException
JsonGenerationException

_writeFieldName

protected abstract void _writeFieldName(String name,
                                        boolean commaBefore)
                                 throws IOException,
                                        JsonGenerationException
Throws:
IOException
JsonGenerationException

writeNumber

public abstract void writeNumber(int i)
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting given value as Json number. Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeNumber in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeNumber

public abstract void writeNumber(long l)
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting given value as Json number. Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeNumber in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeNumber

public abstract void writeNumber(double d)
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting indicate Json numeric value. Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeNumber in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeNumber

public abstract void writeNumber(float f)
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting indicate Json numeric value. Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeNumber in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeNumber

public abstract void writeNumber(BigDecimal dec)
                          throws IOException,
                                 JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting indicate Json numeric value. Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeNumber in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeBoolean

public abstract void writeBoolean(boolean state)
                           throws IOException,
                                  JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting literal Json boolean value (one of Strings 'true' and 'false'). Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeBoolean in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeNull

public abstract void writeNull()
                        throws IOException,
                               JsonGenerationException
Description copied from class: JsonGenerator
Method for outputting literal Json null value. Can be called in any context where a value is expected (Array value, Object field value, root-level value). Additional white space may be added around the value if pretty-printing is enabled.

Specified by:
writeNull in class JsonGenerator
Throws:
IOException
JsonGenerationException

writeObject

public void writeObject(Object value)
                 throws IOException,
                        JsonProcessingException
Description copied from class: JsonGenerator
Method for writing given Java object (POJO) as Json. Exactly how the object gets written depends on object in question (ad on codec, its configuration); for most beans it will result in Json object, but for others Json array, or String or numeric value (and for nulls, Json null literal. NOTE: generator must have its object codec set to non-null value; for generators created by a mapping factory this is the case, for others not.

Specified by:
writeObject in class JsonGenerator
Throws:
IOException
JsonProcessingException

writeTree

public void writeTree(JsonNode rootNode)
               throws IOException,
                      JsonProcessingException
Description copied from class: JsonGenerator
Method for writing given Json tree (expressed as a tree where given JsonNode is the root) using this generator. This will generally just call JsonGenerator.writeObject(java.lang.Object) with given node, but is added for convenience and to make code more explicit in cases where it deals specifically with trees.

Specified by:
writeTree in class JsonGenerator
Throws:
IOException
JsonProcessingException

flush

public abstract void flush()
                    throws IOException
Description copied from class: JsonGenerator
Method called to flush any buffered content to the underlying target (output stream, writer), and to flush the target itself as well.

Specified by:
flush in class JsonGenerator
Throws:
IOException

close

public void close()
           throws IOException
Description copied from class: JsonGenerator
Method called to close this generator, so that no more content can be written.

Whether the underlying target (stream, writer) gets closed depends on whether this generator either manages the target (i.e. is the only one with access to the target -- case if caller passes a reference to the resource such as File, but not stream); or has feature JsonGenerator.Feature.AUTO_CLOSE_TARGET enabled. If either of above is true, the target is also closed. Otherwise (not managing, feature not enabled), target is not closed.

Specified by:
close in interface Closeable
Specified by:
close in class JsonGenerator
Throws:
IOException

isClosed

public boolean isClosed()
Description copied from class: JsonGenerator
Method that can be called to determine whether this generator is closed or not. If it is closed, no more output can be done.

Specified by:
isClosed in class JsonGenerator

copyCurrentEvent

public final void copyCurrentEvent(JsonParser jp)
                            throws IOException,
                                   JsonProcessingException
Description copied from class: JsonGenerator
Method for copying contents of the current event that the given parser instance points to. Note that the method will not copy any other events, such as events contained within Json Array or Object structures.

Calling this method will not advance the given parser, although it may cause parser to internally process more data (if it lazy loads contents of value events, for example)

Specified by:
copyCurrentEvent in class JsonGenerator
Throws:
IOException
JsonProcessingException

copyCurrentStructure

public final void copyCurrentStructure(JsonParser jp)
                                throws IOException,
                                       JsonProcessingException
Description copied from class: JsonGenerator
Method for copying contents of the current event and following events that it encloses the given parser instance points to.

So what constitutes enclosing? Here is the list of events that have associated enclosed events that will get copied:

After calling this method, parser will point to the last event that was copied. This will either be the event parser already pointed to (if there were no enclosed events), or the last enclosed event copied.

Specified by:
copyCurrentStructure in class JsonGenerator
Throws:
IOException
JsonProcessingException

_releaseBuffers

protected abstract void _releaseBuffers()

_verifyValueWrite

protected abstract void _verifyValueWrite(String typeMsg)
                                   throws IOException,
                                          JsonGenerationException
Throws:
IOException
JsonGenerationException

_reportError

protected void _reportError(String msg)
                     throws JsonGenerationException
Throws:
JsonGenerationException

_cantHappen

protected void _cantHappen()

_writeSimpleObject

protected void _writeSimpleObject(Object value)
                           throws IOException,
                                  JsonGenerationException
Helper method to try to call appropriate write method for given untyped Object. At this point, no structural conversions should be done, only simple basic types are to be coerced as necessary.

Parameters:
value - Non-null value to write
Throws:
IOException
JsonGenerationException