Class JsonGenerator
- java.lang.Object
-
- org.codehaus.jackson.JsonGenerator
-
- All Implemented Interfaces:
Closeable
,AutoCloseable
,Versioned
- Direct Known Subclasses:
JsonGeneratorBase
,JsonGeneratorDelegate
,TokenBuffer
public abstract class JsonGenerator extends Object implements Closeable, Versioned
Base class that defines public API for writing JSON content. Instances are created using factory methods of aJsonFactory
instance.- Author:
- Tatu Saloranta
-
-
Nested Class Summary
Nested Classes Modifier and Type Class Description static class
JsonGenerator.Feature
Enumeration that defines all togglable features for generators.
-
Field Summary
Fields Modifier and Type Field Description protected PrettyPrinter
_cfgPrettyPrinter
Object that handles pretty-printing (usually additional white space to make results more human-readable) during output.
-
Constructor Summary
Constructors Modifier Constructor Description protected
JsonGenerator()
-
Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Deprecated Methods Modifier and Type Method Description boolean
canUseSchema(FormatSchema schema)
Method that can be used to verify that given schema can be used with this generator (usingsetSchema(org.codehaus.jackson.FormatSchema)
).abstract void
close()
Method called to close this generator, so that no more content can be written.JsonGenerator
configure(JsonGenerator.Feature f, boolean state)
Method for enabling or disabling specified feature: checkJsonGenerator.Feature
for list of available features.abstract void
copyCurrentEvent(JsonParser jp)
Method for copying contents of the current event that the given parser instance points to.abstract void
copyCurrentStructure(JsonParser jp)
Method for copying contents of the current event and following events that it encloses the given parser instance points to.abstract JsonGenerator
disable(JsonGenerator.Feature f)
Method for disabling specified features (checkJsonGenerator.Feature
for list of features)void
disableFeature(JsonGenerator.Feature f)
Deprecated.abstract JsonGenerator
enable(JsonGenerator.Feature f)
Method for enabling specified parser features: checkJsonGenerator.Feature
for list of available features.void
enableFeature(JsonGenerator.Feature f)
Deprecated.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.CharacterEscapes
getCharacterEscapes()
Method for accessing custom escapes factory uses forJsonGenerator
s it creates.abstract ObjectCodec
getCodec()
Method for accessing the object used for writing Java object as Json content (using methodwriteObject(java.lang.Object)
).int
getHighestEscapedChar()
Accessor method for testing what is the highest unescaped character configured for this generator.abstract JsonStreamContext
getOutputContext()
Object
getOutputTarget()
Method that can be used to get access to object that is used as target for generated output; this is usually eitherOutputStream
orWriter
, depending on what generator was constructed with.abstract boolean
isClosed()
Method that can be called to determine whether this generator is closed or not.abstract boolean
isEnabled(JsonGenerator.Feature f)
Method for checking whether given feature is enabled.boolean
isFeatureEnabled(JsonGenerator.Feature f)
Deprecated.JsonGenerator
setCharacterEscapes(CharacterEscapes esc)
Method for defining custom escapes factory uses forJsonGenerator
s it creates.abstract JsonGenerator
setCodec(ObjectCodec oc)
Method that can be called to set or reset the object to use for writing Java objects as JsonContent (using methodwriteObject(java.lang.Object)
).void
setFeature(JsonGenerator.Feature f, boolean state)
Deprecated.JsonGenerator
setHighestNonEscapedChar(int charCode)
Method that can be called to request that generator escapes all character codes above specified code point (if positive value); or, to not escape any characters except for ones that must be escaped for the data format (if -1).JsonGenerator
setPrettyPrinter(PrettyPrinter pp)
Method for setting a custom pretty printer, which is usually used to add indentation for improved human readability.void
setSchema(FormatSchema schema)
Method to call to make this generator use specified schema.abstract JsonGenerator
useDefaultPrettyPrinter()
Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter
).Version
version()
Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (seeVersion
for details).void
writeArrayFieldStart(String fieldName)
Convenience method for outputting a field entry ("member") (that will contain a JSON Array value), and the START_ARRAY marker.void
writeBinary(byte[] data)
Similar towriteBinary(Base64Variant,byte[],int,int)
, but assumes default to using the Jackson default Base64 variant (which isBase64Variants.MIME_NO_LINEFEEDS
).void
writeBinary(byte[] data, int offset, int len)
Similar towriteBinary(Base64Variant,byte[],int,int)
, but default to using the Jackson default Base64 variant (which isBase64Variants.MIME_NO_LINEFEEDS
).abstract void
writeBinary(Base64Variant b64variant, byte[] data, int offset, int len)
Method that will output given chunk of binary data as base64 encoded, as a complete String value (surrounded by double quotes).void
writeBinaryField(String fieldName, byte[] data)
Convenience method for outputting a field entry ("member") that contains specified data in base64-encoded form.abstract void
writeBoolean(boolean state)
Method for outputting literal Json boolean value (one of Strings 'true' and 'false').void
writeBooleanField(String fieldName, boolean value)
Convenience method for outputting a field entry ("member") that has a boolean value.abstract void
writeEndArray()
Method for writing closing marker of a JSON Array value (character ']'; plus possible white space decoration if pretty-printing is enabled).abstract void
writeEndObject()
Method for writing closing marker of a JSON Object value (character '}'; plus possible white space decoration if pretty-printing is enabled).abstract 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.void
writeFieldName(SerializedString name)
Method similar towriteFieldName(String)
, main difference being that it may perform better as some of processing (such as quoting of certain characters, or encoding into external encoding if supported by generator) can be done just once and reused for later calls.void
writeFieldName(SerializableString name)
Method similar towriteFieldName(String)
, main difference being that it may perform better as some of processing (such as quoting of certain characters, or encoding into external encoding if supported by generator) can be done just once and reused for later calls.abstract void
writeNull()
Method for outputting literal Json null value.void
writeNullField(String fieldName)
Convenience method for outputting a field entry ("member") that has JSON literal value null.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 v)
Method for outputting given value as Json number.abstract void
writeNumber(long v)
Method for outputting given value as Json number.abstract void
writeNumber(String encodedValue)
Write method that can be used for custom numeric types that can not be (easily?) converted to "standard" Java number types.abstract void
writeNumber(BigDecimal dec)
Method for outputting indicate Json numeric value.abstract void
writeNumber(BigInteger v)
Method for outputting given value as Json number.void
writeNumberField(String fieldName, double value)
Convenience method for outputting a field entry ("member") that has the specified numeric value.void
writeNumberField(String fieldName, float value)
Convenience method for outputting a field entry ("member") that has the specified numeric value.void
writeNumberField(String fieldName, int value)
Convenience method for outputting a field entry ("member") that has the specified numeric value.void
writeNumberField(String fieldName, long value)
Convenience method for outputting a field entry ("member") that has the specified numeric value.void
writeNumberField(String fieldName, BigDecimal value)
Convenience method for outputting a field entry ("member") that has the specified numeric value.abstract void
writeObject(Object pojo)
Method for writing given Java object (POJO) as Json.void
writeObjectField(String fieldName, Object pojo)
Convenience method for outputting a field entry ("member") that has contents of specific Java object as its value.void
writeObjectFieldStart(String fieldName)
Convenience method for outputting a field entry ("member") (that will contain a JSON Object value), and the START_OBJECT marker.abstract void
writeRaw(char c)
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such).abstract void
writeRaw(char[] text, int offset, int len)
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such).abstract void
writeRaw(String text)
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such).abstract void
writeRaw(String text, int offset, int len)
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such).abstract void
writeRawUTF8String(byte[] text, int offset, int length)
Method similar towriteString(String)
but that takes as its input a UTF-8 encoded String that is to be output as-is, without additional escaping (type of which depends on data format; backslashes for JSON).abstract void
writeRawValue(char[] text, int offset, int len)
abstract void
writeRawValue(String text)
Method that will force generator to copy input text verbatim without any modifications, but assuming it must constitute a single legal JSON value (number, string, boolean, null, Array or List).abstract void
writeRawValue(String text, int offset, int len)
abstract void
writeStartArray()
Method for writing starting marker of a JSON Array value (character '['; plus possible white space decoration if pretty-printing is enabled).abstract void
writeStartObject()
Method for writing starting marker of a JSON Object value (character '{'; plus possible white space decoration if pretty-printing is enabled).abstract void
writeString(char[] text, int offset, int len)
Method for outputting a String value.abstract void
writeString(String text)
Method for outputting a String value.void
writeString(SerializableString text)
Method similar towriteString(String)
, but that takesSerializableString
which can make this potentially more efficient to call as generator may be able to reuse quoted and/or encoded representation.void
writeStringField(String fieldName, String value)
Convenience method for outputting a field entry ("member") that has a String value.abstract void
writeTree(JsonNode rootNode)
Method for writing given JSON tree (expressed as a tree where given JsonNode is the root) using this generator.abstract void
writeUTF8String(byte[] text, int offset, int length)
Method similar towriteString(String)
but that takes as its input a UTF-8 encoded String which has not been escaped using whatever escaping scheme data format requires (for JSON that is backslash-escaping for control characters and double-quotes; for other formats something else).
-
-
-
Field Detail
-
_cfgPrettyPrinter
protected PrettyPrinter _cfgPrettyPrinter
Object that handles pretty-printing (usually additional white space to make results more human-readable) during output. If null, no pretty-printing is done.
-
-
Method Detail
-
setSchema
public void setSchema(FormatSchema schema)
Method to call to make this generator use specified schema. Method must be called before generating any content, right after instance has been created. Note that not all generators support schemas; and those that do usually only accept specific types of schemas: ones defined for data format this generator produces.If generator does not support specified schema,
UnsupportedOperationException
is thrown.- Parameters:
schema
- Schema to use- Throws:
UnsupportedOperationException
- if generator does not support schema- Since:
- 1.8
-
canUseSchema
public boolean canUseSchema(FormatSchema schema)
Method that can be used to verify that given schema can be used with this generator (usingsetSchema(org.codehaus.jackson.FormatSchema)
).- Parameters:
schema
- Schema to check- Returns:
- True if this generator can use given schema; false if not
- Since:
- 1.8
-
version
public Version version()
Description copied from interface:Versioned
Method called to detect version of the component that implements this interface; returned version should never be null, but may return specific "not available" instance (seeVersion
for details).
-
getOutputTarget
public Object getOutputTarget()
Method that can be used to get access to object that is used as target for generated output; this is usually eitherOutputStream
orWriter
, depending on what generator was constructed with. Note that returned value may be null in some cases; including case where implementation does not want to exposed raw source to caller. In cases where output has been decorated, object returned here is the decorated version; this allows some level of interaction between users of generator and decorator object.In general use of this accessor should be considered as "last effort", i.e. only used if no other mechanism is applicable.
- Since:
- 1.8
-
enable
public abstract JsonGenerator enable(JsonGenerator.Feature f)
Method for enabling specified parser features: checkJsonGenerator.Feature
for list of available features.- Returns:
- Generator itself (this), to allow chaining
- Since:
- 1.2
-
disable
public abstract JsonGenerator disable(JsonGenerator.Feature f)
Method for disabling specified features (checkJsonGenerator.Feature
for list of features)- Returns:
- Generator itself (this), to allow chaining
- Since:
- 1.2
-
configure
public JsonGenerator configure(JsonGenerator.Feature f, boolean state)
Method for enabling or disabling specified feature: checkJsonGenerator.Feature
for list of available features.- Returns:
- Generator itself (this), to allow chaining
- Since:
- 1.2
-
isEnabled
public abstract boolean isEnabled(JsonGenerator.Feature f)
Method for checking whether given feature is enabled. CheckJsonGenerator.Feature
for list of available features.- Since:
- 1.2
-
setCodec
public abstract JsonGenerator setCodec(ObjectCodec oc)
Method that can be called to set or reset the object to use for writing Java objects as JsonContent (using methodwriteObject(java.lang.Object)
).- Returns:
- Generator itself (this), to allow chaining
-
getCodec
public abstract ObjectCodec getCodec()
Method for accessing the object used for writing Java object as Json content (using methodwriteObject(java.lang.Object)
).
-
enableFeature
@Deprecated public void enableFeature(JsonGenerator.Feature f)
Deprecated.
-
disableFeature
@Deprecated public void disableFeature(JsonGenerator.Feature f)
Deprecated.
-
setFeature
@Deprecated public void setFeature(JsonGenerator.Feature f, boolean state)
Deprecated.
-
isFeatureEnabled
@Deprecated public boolean isFeatureEnabled(JsonGenerator.Feature f)
Deprecated.
-
setPrettyPrinter
public JsonGenerator setPrettyPrinter(PrettyPrinter pp)
Method for setting a custom pretty printer, which is usually used to add indentation for improved human readability. By default, generator does not do pretty printing.To use the default pretty printer that comes with core Jackson distribution, call
useDefaultPrettyPrinter()
instead.- Returns:
- Generator itself (this), to allow chaining
-
useDefaultPrettyPrinter
public abstract JsonGenerator useDefaultPrettyPrinter()
Convenience method for enabling pretty-printing using the default pretty printer (DefaultPrettyPrinter
).- Returns:
- Generator itself (this), to allow chaining
-
setHighestNonEscapedChar
public JsonGenerator setHighestNonEscapedChar(int charCode)
Method that can be called to request that generator escapes all character codes above specified code point (if positive value); or, to not escape any characters except for ones that must be escaped for the data format (if -1). To force escaping of all non-ASCII characters, for example, this method would be called with value of 127.Note that generators are NOT required to support setting of value higher than 127, because there are other ways to affect quoting (or lack thereof) of character codes between 0 and 127. Not all generators support concept of escaping, either; if so, calling this method will have no effect.
Default implementation does nothing; sub-classes need to redefine it according to rules of supported data format.
- Parameters:
charCode
- Either -1 to indicate that no additional escaping is to be done; or highest code point not to escape (meaning higher ones will be), if positive value.- Since:
- 1.8
-
getHighestEscapedChar
public int getHighestEscapedChar()
Accessor method for testing what is the highest unescaped character configured for this generator. This may be either positive value (when escaping configuration has been set and is in effect), or 0 to indicate that no additional escaping is in effect. Some generators may not support additional escaping: for example, generators for binary formats that do not use escaping should simply return 0.- Returns:
- Currently active limitation for highest non-escaped character, if defined; or -1 to indicate no additional escaping is performed.
-
getCharacterEscapes
public CharacterEscapes getCharacterEscapes()
Method for accessing custom escapes factory uses forJsonGenerator
s it creates.- Since:
- 1.8
-
setCharacterEscapes
public JsonGenerator setCharacterEscapes(CharacterEscapes esc)
Method for defining custom escapes factory uses forJsonGenerator
s it creates.- Since:
- 1.8
-
writeStartArray
public abstract void writeStartArray() throws IOException, JsonGenerationException
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.
- Throws:
IOException
JsonGenerationException
-
writeEndArray
public abstract void writeEndArray() throws IOException, JsonGenerationException
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.
- Throws:
IOException
JsonGenerationException
-
writeStartObject
public abstract void writeStartObject() throws IOException, JsonGenerationException
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.
- Throws:
IOException
JsonGenerationException
-
writeEndObject
public abstract void writeEndObject() throws IOException, JsonGenerationException
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).
- Throws:
IOException
JsonGenerationException
-
writeFieldName
public abstract void writeFieldName(String name) throws IOException, JsonGenerationException
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).
- Throws:
IOException
JsonGenerationException
-
writeFieldName
public void writeFieldName(SerializedString name) throws IOException, JsonGenerationException
Method similar towriteFieldName(String)
, main difference being that it may perform better as some of processing (such as quoting of certain characters, or encoding into external encoding if supported by generator) can be done just once and reused for later calls.Default implementation simple uses unprocessed name container in serialized String; implementations are strongly encouraged to make use of more efficient methods argument object has.
- Throws:
IOException
JsonGenerationException
- Since:
- 1.6
-
writeFieldName
public void writeFieldName(SerializableString name) throws IOException, JsonGenerationException
Method similar towriteFieldName(String)
, main difference being that it may perform better as some of processing (such as quoting of certain characters, or encoding into external encoding if supported by generator) can be done just once and reused for later calls.Default implementation simple uses unprocessed name container in serialized String; implementations are strongly encouraged to make use of more efficient methods argument object has.
- Throws:
IOException
JsonGenerationException
- Since:
- 1.7
-
writeString
public abstract void writeString(String text) throws IOException, JsonGenerationException
Method for outputting a String value. Depending on context this means either array element, (object) field value or a stand alone String; but in all cases, String will be surrounded in double quotes, and contents will be properly escaped as required by JSON specification.- Throws:
IOException
JsonGenerationException
-
writeString
public abstract void writeString(char[] text, int offset, int len) throws IOException, JsonGenerationException
Method for outputting a String value. Depending on context this means either array element, (object) field value or a stand alone String; but in all cases, String will be surrounded in double quotes, and contents will be properly escaped as required by JSON specification.- Throws:
IOException
JsonGenerationException
-
writeString
public void writeString(SerializableString text) throws IOException, JsonGenerationException
Method similar towriteString(String)
, but that takesSerializableString
which can make this potentially more efficient to call as generator may be able to reuse quoted and/or encoded representation.Default implementation just calls
writeString(String)
; sub-classes should override it with more efficient implementation if possible.- Throws:
IOException
JsonGenerationException
- Since:
- 1.7
-
writeRawUTF8String
public abstract void writeRawUTF8String(byte[] text, int offset, int length) throws IOException, JsonGenerationException
Method similar towriteString(String)
but that takes as its input a UTF-8 encoded String that is to be output as-is, without additional escaping (type of which depends on data format; backslashes for JSON). However, quoting that data format requires (like double-quotes for JSON) will be added around the value if and as necessary.Note that some backends may choose not to support this method: for example, if underlying destination is a
Writer
using this method would require UTF-8 decoding. If so, implementation may instead choose to throw aUnsupportedOperationException
due to ineffectiveness of having to decode input.- Throws:
IOException
JsonGenerationException
- Since:
- 1.7
-
writeUTF8String
public abstract void writeUTF8String(byte[] text, int offset, int length) throws IOException, JsonGenerationException
Method similar towriteString(String)
but that takes as its input a UTF-8 encoded String which has not been escaped using whatever escaping scheme data format requires (for JSON that is backslash-escaping for control characters and double-quotes; for other formats something else). This means that textual JSON backends need to check if value needs JSON escaping, but otherwise can just be copied as is to output. Also, quoting that data format requires (like double-quotes for JSON) will be added around the value if and as necessary.Note that some backends may choose not to support this method: for example, if underlying destination is a
Writer
using this method would require UTF-8 decoding. In this case generator implementation may instead choose to throw aUnsupportedOperationException
due to ineffectiveness of having to decode input.- Throws:
IOException
JsonGenerationException
- Since:
- 1.7
-
writeRaw
public abstract void writeRaw(String text) throws IOException, JsonGenerationException
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such). If such separators are desired, usewriteRawValue(String)
instead.Note that not all generator implementations necessarily support such by-pass methods: those that do not will throw
UnsupportedOperationException
.- Throws:
IOException
JsonGenerationException
-
writeRaw
public abstract void writeRaw(String text, int offset, int len) throws IOException, JsonGenerationException
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such). If such separators are desired, usewriteRawValue(String)
instead.Note that not all generator implementations necessarily support such by-pass methods: those that do not will throw
UnsupportedOperationException
.- Throws:
IOException
JsonGenerationException
-
writeRaw
public abstract void writeRaw(char[] text, int offset, int len) throws IOException, JsonGenerationException
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such). If such separators are desired, usewriteRawValue(String)
instead.Note that not all generator implementations necessarily support such by-pass methods: those that do not will throw
UnsupportedOperationException
.- Throws:
IOException
JsonGenerationException
-
writeRaw
public abstract void writeRaw(char c) throws IOException, JsonGenerationException
Method that will force generator to copy input text verbatim with no modifications (including that no escaping is done and no separators are added even if context [array, object] would otherwise require such). If such separators are desired, usewriteRawValue(String)
instead.Note that not all generator implementations necessarily support such by-pass methods: those that do not will throw
UnsupportedOperationException
.- Throws:
IOException
JsonGenerationException
-
writeRawValue
public abstract void writeRawValue(String text) throws IOException, JsonGenerationException
Method that will force generator to copy input text verbatim without any modifications, but assuming it must constitute a single legal JSON value (number, string, boolean, null, Array or List). Assuming this, proper separators are added if and as needed (comma or colon), and generator state updated to reflect this.- Throws:
IOException
JsonGenerationException
-
writeRawValue
public abstract void writeRawValue(String text, int offset, int len) throws IOException, JsonGenerationException
- Throws:
IOException
JsonGenerationException
-
writeRawValue
public abstract void writeRawValue(char[] text, int offset, int len) throws IOException, JsonGenerationException
- Throws:
IOException
JsonGenerationException
-
writeBinary
public abstract void writeBinary(Base64Variant b64variant, byte[] data, int offset, int len) throws IOException, JsonGenerationException
Method that will output given chunk of binary data as base64 encoded, as a complete String value (surrounded by double quotes). This method defaultsNote: because Json Strings can not contain unescaped linefeeds, if linefeeds are included (as per last argument), they must be escaped. This adds overhead for decoding without improving readability. Alternatively if linefeeds are not included, resulting String value may violate the requirement of base64 RFC which mandates line-length of 76 characters and use of linefeeds. However, all
JsonParser
implementations are required to accept such "long line base64"; as do typical production-level base64 decoders.- Parameters:
b64variant
- Base64 variant to use: defines details such as whether padding is used (and if so, using which character); what is the maximum line length before adding linefeed, and also the underlying alphabet to use.- Throws:
IOException
JsonGenerationException
-
writeBinary
public void writeBinary(byte[] data, int offset, int len) throws IOException, JsonGenerationException
Similar towriteBinary(Base64Variant,byte[],int,int)
, but default to using the Jackson default Base64 variant (which isBase64Variants.MIME_NO_LINEFEEDS
).- Throws:
IOException
JsonGenerationException
-
writeBinary
public void writeBinary(byte[] data) throws IOException, JsonGenerationException
Similar towriteBinary(Base64Variant,byte[],int,int)
, but assumes default to using the Jackson default Base64 variant (which isBase64Variants.MIME_NO_LINEFEEDS
). Also assumes that whole byte array is to be output.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(int v) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(long v) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(BigInteger v) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(double d) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(float f) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(BigDecimal dec) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNumber
public abstract void writeNumber(String encodedValue) throws IOException, JsonGenerationException, UnsupportedOperationException
Write method that can be used for custom numeric types that can not be (easily?) converted to "standard" Java number types. Because numbers are not surrounded by double quotes, regularwriteString(java.lang.String)
method can not be used; norwriteRaw(java.lang.String)
because that does not properly handle value separators needed in Array or Object contexts.Note: because of lack of type safety, some generator implementations may not be able to implement this method. For example, if a binary json format is used, it may require type information for encoding; similarly for generator-wrappers around Java objects or Json nodes. If implementation does not implement this method, it needs to throw
UnsupportedOperationException
.
-
writeBoolean
public abstract void writeBoolean(boolean state) throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeNull
public abstract void writeNull() throws IOException, JsonGenerationException
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.- Throws:
IOException
JsonGenerationException
-
writeObject
public abstract void writeObject(Object pojo) throws IOException, JsonProcessingException
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.- Throws:
IOException
JsonProcessingException
-
writeTree
public abstract void writeTree(JsonNode rootNode) throws IOException, JsonProcessingException
Method for writing given JSON tree (expressed as a tree where given JsonNode is the root) using this generator. This will generally just callwriteObject(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.- Throws:
IOException
JsonProcessingException
-
writeStringField
public void writeStringField(String fieldName, String value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has a String value. Equivalent to:writeFieldName(fieldName); writeString(value);
Note: many performance-sensitive implementations override this method
- Throws:
IOException
JsonGenerationException
-
writeBooleanField
public final void writeBooleanField(String fieldName, boolean value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has a boolean value. Equivalent to:writeFieldName(fieldName); writeBoolean(value);
- Throws:
IOException
JsonGenerationException
-
writeNullField
public final void writeNullField(String fieldName) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has JSON literal value null. Equivalent to:writeFieldName(fieldName); writeNull();
- Throws:
IOException
JsonGenerationException
-
writeNumberField
public final void writeNumberField(String fieldName, int value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has the specified numeric value. Equivalent to:writeFieldName(fieldName); writeNumber(value);
- Throws:
IOException
JsonGenerationException
-
writeNumberField
public final void writeNumberField(String fieldName, long value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has the specified numeric value. Equivalent to:writeFieldName(fieldName); writeNumber(value);
- Throws:
IOException
JsonGenerationException
-
writeNumberField
public final void writeNumberField(String fieldName, double value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has the specified numeric value. Equivalent to:writeFieldName(fieldName); writeNumber(value);
- Throws:
IOException
JsonGenerationException
-
writeNumberField
public final void writeNumberField(String fieldName, float value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has the specified numeric value. Equivalent to:writeFieldName(fieldName); writeNumber(value);
- Throws:
IOException
JsonGenerationException
-
writeNumberField
public final void writeNumberField(String fieldName, BigDecimal value) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that has the specified numeric value. Equivalent to:writeFieldName(fieldName); writeNumber(value);
- Throws:
IOException
JsonGenerationException
-
writeBinaryField
public final void writeBinaryField(String fieldName, byte[] data) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") that contains specified data in base64-encoded form. Equivalent to:writeFieldName(fieldName); writeBinary(value);
- Throws:
IOException
JsonGenerationException
-
writeArrayFieldStart
public final void writeArrayFieldStart(String fieldName) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") (that will contain a JSON Array value), and the START_ARRAY marker. Equivalent to:writeFieldName(fieldName); writeStartArray();
Note: caller still has to take care to close the array (by calling {#link #writeEndArray}) after writing all values of the value Array.
- Throws:
IOException
JsonGenerationException
-
writeObjectFieldStart
public final void writeObjectFieldStart(String fieldName) throws IOException, JsonGenerationException
Convenience method for outputting a field entry ("member") (that will contain a JSON Object value), and the START_OBJECT marker. Equivalent to:writeFieldName(fieldName); writeStartObject();
Note: caller still has to take care to close the Object (by calling {#link #writeEndObject}) after writing all entries of the value Object.
- Throws:
IOException
JsonGenerationException
-
writeObjectField
public final void writeObjectField(String fieldName, Object pojo) throws IOException, JsonProcessingException
Convenience method for outputting a field entry ("member") that has contents of specific Java object as its value. Equivalent to:writeFieldName(fieldName); writeObject(pojo);
- Throws:
IOException
JsonProcessingException
-
copyCurrentEvent
public abstract void copyCurrentEvent(JsonParser jp) throws IOException, JsonProcessingException
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)
- Throws:
IOException
JsonProcessingException
-
copyCurrentStructure
public abstract void copyCurrentStructure(JsonParser jp) throws IOException, JsonProcessingException
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:
JsonToken.START_OBJECT
: all events up to and including matching (closing)JsonToken.END_OBJECT
will be copiedJsonToken.START_ARRAY
all events up to and including matching (closing)JsonToken.END_ARRAY
will be copiedJsonToken.FIELD_NAME
the logical value (which can consist of a single scalar value; or a sequence of related events for structured types (Json Arrays, Objects)) will be copied along with the name itself. So essentially the whole field entry (name and value) will be 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.
- Throws:
IOException
JsonProcessingException
-
getOutputContext
public abstract JsonStreamContext getOutputContext()
- Returns:
- Context object that can give information about logical position within generated json content.
-
flush
public abstract void flush() throws IOException
Method called to flush any buffered content to the underlying target (output stream, writer), and to flush the target itself as well.- Throws:
IOException
-
isClosed
public abstract boolean isClosed()
Method that can be called to determine whether this generator is closed or not. If it is closed, no more output can be done.
-
close
public abstract void close() throws IOException
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 interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Throws:
IOException
-
-