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javax.xml.transform.sax
This package implements SAX2-specific transformation APIs. It provides
classes which allow input from {@link org.xml.sax.ContentHandler}
events, and also classes that produce org.xml.sax.ContentHandler events. It
also provides methods to set the input source as an
{@link org.xml.sax.XMLReader}, or to use a
{@link org.xml.sax.InputSource} as the source. It also allows the
creation of a {@link org.xml.sax.XMLFilter}, which enables
transformations to "pull" from other transformations, and lets the transformer
to be used polymorphically as an {@link org.xml.sax.XMLReader}.
The {@link javax.xml.transform.sax.SAXSource} class allows the
setting of an {@link org.xml.sax.XMLReader} to be used for "pulling"
parse events, and an {@link org.xml.sax.InputSource} that may be used to
specify the SAX source.
The {@link javax.xml.transform.sax.SAXResult} class allows the
setting of a {@link org.xml.sax.ContentHandler} to be the receiver of
SAX2 events from the transformation.
The {@link javax.xml.transform.sax.SAXTransformerFactory} extends
{@link javax.xml.transform.TransformerFactory} to provide factory
methods for creating {@link javax.xml.transform.sax.TemplatesHandler},
{@link javax.xml.transform.sax.TransformerHandler}, and
{@link org.xml.sax.XMLReader} instances.
To obtain a {@link javax.xml.transform.sax.SAXTransformerFactory},
the caller must cast the {@link javax.xml.transform.TransformerFactory}
instance returned from
{@link javax.xml.transform.TransformerFactory#newInstance}.
The {@link javax.xml.transform.sax.TransformerHandler} interface
allows a transformation to be created from SAX2 parse events, which is a "push"
model rather than the "pull" model that normally occurs for a transformation.
Normal parse events are received through the
{@link org.xml.sax.ContentHandler} interface, lexical events such as
startCDATA and endCDATA are received through the
{@link org.xml.sax.ext.LexicalHandler} interface, and events that signal
the start or end of disabling output escaping are received via
{@link org.xml.sax.ContentHandler#processingInstruction}, with the
target parameter being
{@link javax.xml.transform.Result#PI_DISABLE_OUTPUT_ESCAPING} and
{@link javax.xml.transform.Result#PI_ENABLE_OUTPUT_ESCAPING}. If
parameters, output properties, or other features need to be set on the
Transformer handler, a {@link javax.xml.transform.Transformer} reference
will need to be obtained from
{@link javax.xml.transform.sax.TransformerHandler#getTransformer}, and
the methods invoked from that reference.
The {@link javax.xml.transform.sax.TemplatesHandler} interface
allows the creation of {@link javax.xml.transform.Templates} objects
from SAX2 parse events. Once the {@link org.xml.sax.ContentHandler}
events are complete, the Templates object may be obtained from
{@link javax.xml.transform.sax.TemplatesHandler#getTemplates}. Note that
{@link javax.xml.transform.sax.TemplatesHandler#setSystemId} should
normally be called in order to establish a base system ID from which relative
URLs may be resolved.
The
{@link javax.xml.transform.sax.SAXTransformerFactory#newXMLFilter}
method allows the creation of a {@link org.xml.sax.XMLFilter}, which
encapsulates the SAX2 notion of a "pull" transformation. The following
illustrates several transformations chained together. Each filter points to a
parent {@link org.xml.sax.XMLReader}, and the final transformation is
caused by invoking {@link org.xml.sax.XMLReader#parse} on the final
reader in the chain.
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