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See:
Description
Interface Summary | |
DOMSerializer | Interface for a DOM serializer implementation. |
Serializer | Interface to a serializer implementation. |
SerializerHandler | Interface that supplements DocumentHandler and
ContentHandler with additional methods suitable
for serialization. |
Class Summary | |
Method | Names of the four default output methods. |
OutputFormat | The output format affects the manner in which a document is serialized. |
QName | A qualified name. |
SerializerFactory | Factory for creating new serializers. |
Serializer
defines the interface supported by a serializer.
A serializer implements a mechanism for producing output from a series
of SAX events or a DOM document, in a given output format (aka the output
method). A serializer can be constructed directly, or obtained from some
factory, it may implement the base functionality or provide additional
functionality suitable for the given output format (e.g. indentation in
XML, page control in PDF, etc).
A serializer is not thread safe and may not be used concurrently, however, a serializer may be recyclable and used to serialize any number of documents with the same output method.
Before serializing a document, the serializer must be set with the output
stream or writer, and optionally with an OutputFormat
specifying
the output properties. Serializer implementations may provide additional
methods to control the way in which documents are serialized, or extend
OutputFormat
and offer additional output properties.
The Serializer
and OutputFormat
provides the minimum
functionality that all serializer implementations must provide and that
an application may depend on, and are based on the XSLT 1.0 specification.
For the purpose of serializing, a handle to the serializer is obtained
that can be either a SAX 1 DocumentHandler, a SAX 2 ContentHandler
or a DOM Level 1/2 DOMSerializer
. The application should obtain
and use only one handle at any given time and may not reuse the handle to
serialize multiple documents. It is illegal for the application to call
two different handle returning methods without resetting the serializer,
or two use the same handle after resetting the serializer.
The SerializerFactory
provides a means of obtaining the default
serializers available from a given implementation. At the minimum an
implementation should support XML, HTML and Text serializers. When additional
serializers are available, the application may obtain them through the SerializerFactory
or construct them directly.
Non-escaping and whitespace preserving output control is offered for
XML, HTML and similar output method, but it is not mandatory that a
serializer support these output control methods. Non-escaping and whitespace
preserving can be set globally through the OutputFormat
object,
or directly when serializing SAX events through the SerializerHandler
interface. Serializers are not required to implement the SerializerHandler
interface.
Serialize a DOM document as XML:
void printXML( Document doc, OutputStream stream, String encoding ) { OutputFormat format; Serializer ser; // Obtain a suitable output format for the XML method and // set the encoding. format = SerializerFactory.getOutputFormat( Method.XML ); format.setEncoding( encoding ); // Obtain a suitable serializer for the XML method and // set the output stream. ser = SerializerFactory.getSerializer( format ); ser.setOutputStream( stream ); // Use DOMSerializer to serialize the document ser.asDOMSerializer().serialize( doc ); }
Serialize an empty HTML document using SAX events, reuse the serializer:
Serializer ser; // Obtain an HTML serializer once, use it multiple times. ser = SerializerFactory.getSerializer( Method.HTML ); printEmptyHTML( ser, System.out ); printEmptyHTML( ser, System.err ); . . . void printEmptyHTML( Serializer ser, OutputStream os ) { ser.setOutputStream( os ); ser.asDocumentHandler().startDocument(); ser.asDocumentHandler().startElement( "html", new AttributeListImpl() ); ser.asDocumentHandler().endElement( "html" ); ser.asDocumentHandler().endDocument(); ser.reset(); }
An implementation will include a serializer properties file called serializer.properties located in the org.xml.serialize package. The properties file lists all the default serializers supported by that implementation. Serializers that are not listed in the properties file may be constructed directly by the application.
The properties file contains a property org.xml.serialize.methods
listing all the output methods supported by the implementation (comma
separated list). For each method a property org.xml.serialize.[method]
names the class of the Serializer
implementation. In addition a
property org.xml.serialize.format.[method] names the class of a
suitable OutputFormat
implementation.
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