org.apache.synapse.commons.staxon.core.json

Class JsonXMLStreamWriter

java.lang.Object

org.apache.synapse.commons.staxon.core.base.AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter

All Implemented Interfaces:

XMLStreamWriter

public class JsonXMLStreamWriter
extends AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

JSON XML stream writer.

Limitations

• Mixed content (e.g. <alice>bob<edgar/></alice>) is not supported.
• writeDTD(...) and writeEntityRef(...) are not supported.
• writeCData(...) delegates to writeCharacters(...).
• writeComment(...) does nothing.
• writeProcessingInstruction(...) does nothing (except for target xml-multiple, see below).

The writer may consume processing instructions (e.g. <?xml-multiple element-name?>) to properly insert JSON array tokens ('[' and ']'). The client provides this instruction through the AbstractXMLStreamWriter.writeProcessingInstruction(String, String) method, passing the (possibly prefixed) field name as data e.g.

   ...
   writer.writeProcessingInstruction("xml-multiple", "item");
   for (Item item : items) {
     writer.writeStartElement("item");
     ...
     writer.writeEndElement();
   }
   ...
 

The element name passed as processing instruction data is optional. If omitted, the next element within the current scope will start an array. Note, that this method does not allow to create empty arrays (in fact, the above code sample could create unexpected results, if the name would have been omitted and collection were empty).

Constructor Summary

Constructors

Constructor and Description
JsonXMLStreamWriter(JsonStreamTarget target, boolean repairNamespaces, boolean multiplePI, char namespaceSeparator, boolean namespaceDeclarations) Create writer instance.
JsonXMLStreamWriter(JsonStreamTarget target, boolean repairNamespaces, boolean multiplePI, char namespaceSeparator, boolean namespaceDeclarations, boolean xmlNilReadWriteEnabled, boolean xmlWriteNullForEmptyElement) Create writer instance.

Method Summary

Modifier and Type	Method and Description
void	close()
void	flush()
protected void	writeAttr(String prefix, String localName, String namespaceURI, String value) Write attribute.
void	writeAttribute(String prefix, String namespaceURI, String localName, String value)
void	writeBoolean(Boolean value) Write boolean value.
protected void	writeData(Object data, int type) Write characters/comment/dtd/entity data.
void	writeEndArray()
void	writeEndDocument()
protected void	writeEndElementTag() Write end element tag.
void	writeNamespace(String prefix, String namespaceURI)
protected void	writeNsDecl(String prefix, String namespaceURI) Write namespace declaration.
void	writeNumber(Number value) Write number value.
protected void	writePI(String target, String data) Read processing instruction.
void	writeStartArray(String fieldName)
void	writeStartDocument(String encoding, String version)
protected org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo	writeStartElementTag(String prefix, String localName, String namespaceURI) Write open start element tag.
protected void	writeStartElementTagEnd() Write close start element tag.

Methods inherited from class org.apache.synapse.commons.staxon.core.base.AbstractXMLStreamWriter

getNamespaceContext, getPrefix, getProperty, getScope, isStartDocumentWritten, setDefaultNamespace, setNamespaceContext, setPrefix, writeAttribute, writeAttribute, writeCData, writeCharacters, writeCharacters, writeCharacters, writeComment, writeDefaultNamespace, writeDTD, writeEmptyElement, writeEmptyElement, writeEmptyElement, writeEndElement, writeEntityRef, writeProcessingInstruction, writeProcessingInstruction, writeStartDocument, writeStartDocument, writeStartElement, writeStartElement, writeStartElement

Methods inherited from class java.lang.Object

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

Constructor Detail

JsonXMLStreamWriter

public JsonXMLStreamWriter(JsonStreamTarget target,
                           boolean repairNamespaces,
                           boolean multiplePI,
                           char namespaceSeparator,
                           boolean namespaceDeclarations)

Create writer instance.

Parameters:

target - stream target

multiplePI - whether to consume <xml-multiple?> PIs to trigger array start

namespaceSeparator - namespace prefix separator

namespaceDeclarations - whether to write namespace declarations

repairNamespaces - repair Namespaces

JsonXMLStreamWriter

public JsonXMLStreamWriter(JsonStreamTarget target,
                           boolean repairNamespaces,
                           boolean multiplePI,
                           char namespaceSeparator,
                           boolean namespaceDeclarations,
                           boolean xmlNilReadWriteEnabled,
                           boolean xmlWriteNullForEmptyElement)

Create writer instance.

Parameters:

target - stream target

multiplePI - whether to consume <xml-multiple?> PIs to trigger array start

namespaceSeparator - namespace prefix separator

namespaceDeclarations - whether to write namespace declarations

xmlNilReadWriteEnabled - Supports reading and writing of XML Nil elements as defined by http://www.w3.org/TR/xmlschema-1/#xsi_nil when the XML/JSON inputs contains nil/null values.

repairNamespaces - repair Namespaces

xmlWriteNullForEmptyElement - write null or "" for XML empty elements without nil attribute

Method Detail

writeStartElementTag

protected org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo writeStartElementTag(String prefix,
                                                                                                         String localName,
                                                                                                         String namespaceURI)
                                                                                                  throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Write open start element tag. The returned scope info is stored in the new scope and will be available via getScope().getInfo().

Specified by:

writeStartElementTag in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Parameters:

prefix - element prefix (may be XMLConstants.DEFAULT_NS_PREFIX)

localName - local name

namespaceURI - namespace URI

Returns:

new scope info

Throws:

XMLStreamException

writeStartElementTagEnd

protected void writeStartElementTagEnd()
                                throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Write close start element tag.

Specified by:

writeStartElementTagEnd in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

writeEndElementTag

protected void writeEndElementTag()
                           throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Write end element tag.

Specified by:

writeEndElementTag in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

writeAttribute

public void writeAttribute(String prefix,
                           String namespaceURI,
                           String localName,
                           String value)
                    throws XMLStreamException

Specified by:

writeAttribute in interface XMLStreamWriter

Overrides:

writeAttribute in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

writeNamespace

public void writeNamespace(String prefix,
                           String namespaceURI)
                    throws XMLStreamException

Specified by:

writeNamespace in interface XMLStreamWriter

Overrides:

writeNamespace in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

writeAttr

protected void writeAttr(String prefix,
                         String localName,
                         String namespaceURI,
                         String value)
                  throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Write attribute.

Specified by:

writeAttr in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Parameters:

prefix - attribute prefix (may be XMLConstants.DEFAULT_NS_PREFIX)

localName - local name

namespaceURI - namespace URI

value - attribute value

Throws:

XMLStreamException

writeNsDecl

protected void writeNsDecl(String prefix,
                           String namespaceURI)
                    throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Write namespace declaration.

Specified by:

writeNsDecl in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Parameters:

prefix - namespace prefix

namespaceURI - namespace URI

Throws:

XMLStreamException

writeData

protected void writeData(Object data,
                         int type)
                  throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Write characters/comment/dtd/entity data.

Specified by:

writeData in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Parameters:

data - text/data

type - one of CHARACTERS, COMMENT, CDATA, DTD, ENTITY_REFERENCE, SPACE

Throws:

XMLStreamException

writeStartDocument

public void writeStartDocument(String encoding,
                               String version)
                        throws XMLStreamException

Specified by:

writeStartDocument in interface XMLStreamWriter

Overrides:

writeStartDocument in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

writeEndDocument

public void writeEndDocument()
                      throws XMLStreamException

Specified by:

writeEndDocument in interface XMLStreamWriter

Overrides:

writeEndDocument in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

writeStartArray

public void writeStartArray(String fieldName)
                     throws XMLStreamException

Throws:

XMLStreamException

writeEndArray

public void writeEndArray()
                   throws XMLStreamException

Throws:

XMLStreamException

close

public void close()
           throws XMLStreamException

Specified by:

close in interface XMLStreamWriter

Overrides:

close in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Throws:

XMLStreamException

flush

public void flush()
           throws XMLStreamException

Throws:

XMLStreamException

writePI

protected void writePI(String target,
                       String data)
                throws XMLStreamException

Description copied from class: AbstractXMLStreamWriter

Read processing instruction.

Specified by:

writePI in class AbstractXMLStreamWriter<org.apache.synapse.commons.staxon.core.json.JsonXMLStreamWriter.ScopeInfo>

Parameters:

target - PI target

data - PI data (may be null)

Throws:

XMLStreamException

writeNumber

public void writeNumber(Number value)
                 throws XMLStreamException

Write number value.

Parameters:

value -

Throws:

XMLStreamException

writeBoolean

public void writeBoolean(Boolean value)
                  throws XMLStreamException

Write boolean value.

Parameters:

value -

Throws:

XMLStreamException