| <HTML><HEAD><SCRIPT language="JavaScript" src="resources/script.js" type="text/javascript"></SCRIPT><TITLE>Using the JAXP Transform APIs</TITLE></HEAD><BODY alink="#ff0000" bgcolor="#ffffff" leftmargin="4" link="#0000ff" marginheight="4" marginwidth="4" text="#000000" topmargin="4" vlink="#0000aa"><TABLE border="0" cellpadding="0" cellspacing="0" width="620"><TR><TD align="left" height="60" rowspan="3" valign="top" width="135"><IMG alt="logo" border="0" height="60" hspace="0" src="resources/logo.gif" vspace="0" width="135"></TD><TD align="left" colspan="4" height="5" valign="top" width="456"><IMG alt="line" border="0" height="5" hspace="0" src="resources/line.gif" vspace="0" width="456"></TD><TD align="left" height="60" rowspan="3" valign="top" width="29"><IMG alt="right" border="0" height="60" hspace="0" src="resources/right.gif" vspace="0" width="29"></TD></TR><TR><TD align="left" bgcolor="#0086b2" colspan="4" height="35" valign="top" width="456"><IMG alt="" border="0" height="35" hspace="0" src="graphics/trax-header.jpg" vspace="0" width="456"></TD></TR><TR><TD align="left" height="20" valign="top" width="168"><IMG alt="bottom" border="0" height="20" hspace="0" src="resources/bottom.gif" vspace="0" width="168"></TD><TD align="left" height="20" valign="top" width="96"><A href="http://xalan.apache.org/" onMouseOut="rolloverOff('xml');" onMouseOver="rolloverOn('xml');" target="new"><IMG alt="http://xalan.apache.org/" border="0" height="20" hspace="0" name="xml" onLoad="rolloverLoad('xml','resources/button-xml-hi.gif','resources/button-xml-lo.gif');" src="resources/button-xml-lo.gif" vspace="0" width="96"></A></TD><TD align="left" height="20" valign="top" width="96"><A href="http://www.apache.org/" onMouseOut="rolloverOff('asf');" onMouseOver="rolloverOn('asf');" target="new"><IMG alt="http://www.apache.org/" border="0" height="20" hspace="0" name="asf" onLoad="rolloverLoad('asf','resources/button-asf-hi.gif','resources/button-asf-lo.gif');" src="resources/button-asf-lo.gif" vspace="0" width="96"></A></TD><TD align="left" height="20" valign="top" width="96"><A href="http://www.w3.org/" onMouseOut="rolloverOff('w3c');" onMouseOver="rolloverOn('w3c');" target="new"><IMG alt="http://www.w3.org/" border="0" height="20" hspace="0" name="w3c" onLoad="rolloverLoad('w3c','resources/button-w3c-hi.gif','resources/button-w3c-lo.gif');" src="resources/button-w3c-lo.gif" vspace="0" width="96"></A></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="620"><TR><TD align="left" valign="top" width="120"><IMG alt="join" border="0" height="14" hspace="0" src="resources/join.gif" vspace="0" width="120"><BR> |
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| <IMG alt="close" border="0" height="14" hspace="0" src="resources/close.gif" vspace="0" width="120"><BR></TD><TD align="left" valign="top" width="500"><TABLE border="0" cellpadding="3" cellspacing="0"><TR><TD> |
| <UL> |
| <LI><A href="#intro">Introduction</A></LI> |
| <LI><A href="#terminology">General Terminology</A></LI> |
| <LI><A href="#model">Model</A></LI> |
| <LI><A href="#patterns">Patterns</A></LI> |
| </UL><A name="intro"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="666699" colspan="2" width="494"><TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="492"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Introduction</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="484"><FONT color="#000000" face="arial,helvetica,sanserif"> |
| <P>This document describes the transformation API for XML (TrAX), the set of APIs contained in |
| <A href="apidocs/javax/xml/transform/package-summary.html">javax.xml.transform</A>, <A href="apidocs/javax/xml/transform/stream/package-summary.html">javax.xml.transform.stream</A>, <A href="apidocs/javax/xml/transform/dom/package-summary.html">javax.xml.transform.dom</A>, and <A href="apidocs/javax/xml/transform/sax/package-summary.html">javax.xml.transform.sax</A>.</P> |
| |
| <P>There is a broad need for Java applications to be able to transform XML |
| and related tree-shaped data structures. In fact, XML is not normally very |
| useful to an application without going through some sort of transformation, |
| unless the semantic structure is used directly as data. Almost all XML-related |
| applications need to perform transformations. Transformations may be described |
| by Java code, Perl code, <A href="http://www.w3.org/TR/xslt">XSLT</A> |
| Stylesheets, other types of script, or by proprietary formats. The inputs, one |
| or multiple, to a transformation, may be a URL, XML stream, a DOM tree, SAX |
| Events, or a proprietary format or data structure. The output types are |
| pretty much the same types as the inputs, but different inputs may need to be |
| combined with different outputs.</P> |
| |
| <P>The great challenge of a transformation API is how to deal with all the |
| possible combinations of inputs and outputs, without becoming specialized for |
| any of the given types.</P> |
| |
| </FONT></TD></TR></TABLE><BR><A name="terminology"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="666699" colspan="2" width="494"><TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="492"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>General Terminology</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="484"><FONT color="#000000" face="arial,helvetica,sanserif"> |
| |
| <P>This section will explain some general terminology used in this |
| document. Technical terminology will be explained in the Model section. In many |
| cases, the general terminology overlaps with the technical terminology.</P> |
| |
| <DL> |
| <DT>Tree</DT> |
| <DD>This term, as used within this document, describes an |
| abstract structure that consists of nodes or events that may be produced by |
| XML. A Tree physically may be a DOM tree, a series of well balanced parse |
| events (such as those coming from a SAX2 ContentHander), a series of requests |
| (the result of which can describe a tree), or a stream of marked-up |
| characters.</DD> |
| |
| <DT>Source Tree(s)</DT> |
| <DD>One or more trees that are the inputs to the |
| transformation.</DD> |
| |
| <DT>Result Tree(s)</DT> |
| <DD>One or more trees that are the output of the |
| transformation.</DD> |
| |
| |
| |
| <DT>Transformation</DT> |
| <DD>The process of consuming a stream or tree to produce |
| another stream or tree.</DD> |
| |
| |
| |
| <DT>Identity (or Copy) Transformation</DT> |
| <DD>The process of transformation from a source to a result, |
| making as few structural changes as possible and no informational changes. The |
| term is somewhat loosely used, as the process is really a copy from one |
| "format" (such as a DOM tree, stream, or set of SAX events) to |
| another.</DD> |
| |
| |
| |
| <DT>Serialization</DT> |
| <DD>The process of taking a tree and turning it into a stream. In |
| some sense, a serialization is a specialized transformation.</DD> |
| |
| |
| |
| <DT>Parsing</DT> |
| <DD>The process of taking a stream and turning it into a tree. In |
| some sense, parsing is a specialized transformation.</DD> |
| |
| |
| |
| <DT>Transformer</DT> |
| <DD>A Transformer is the object that executes the transformation. |
| </DD> |
| |
| |
| |
| <DT>Transformation instructions</DT> |
| <DD>Describes the transformation. A form of code, script, or |
| simply a declaration or series of declarations.</DD> |
| |
| |
| |
| <DT>Stylesheet</DT> |
| <DD>The same as "transformation instructions," except it is |
| likely to be used in conjunction with <A href="http://www.w3.org/TR/xslt">XSLT</A>.</DD> |
| |
| |
| |
| <DT>Templates</DT> |
| <DD>Another form of "transformation instructions." In the TrAX |
| interface, this term is used to describe processed or compiled transformation |
| instructions. The Source flows through a Templates object to be formed into the |
| Result.</DD> |
| |
| |
| |
| <DT>Processor</DT> |
| <DD>A general term for the thing that may both process the |
| transformation instructions, and perform the transformation.</DD> |
| |
| |
| |
| |
| <DT>DOM</DT> |
| <DD>Document Object Model, specifically referring to the <A href="http://www.w3.org/TR/2004/REC-DOM-Level-3-Core-20040407/" target="_top">DOM level 3</A> |
| Specification.</DD> |
| |
| |
| <DT>SAX</DT> |
| <DD>Simple API for XML, specifically referring to the |
| <A href="http://www.saxproject.org/">SAX 2.0 |
| release</A>.</DD> |
| </DL> |
| |
| </FONT></TD></TR></TABLE><BR> <A name="model"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="666699" colspan="2" width="494"><TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="492"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Model</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="484"><FONT color="#000000" face="arial,helvetica,sanserif"> |
| |
| <P>The section defines the abstract model for TrAX, apart from the details |
| of the interfaces.</P> |
| |
| <P>A TrAX <A href="#pattern-TransformerFactory">TransformerFactory</A> is an object |
| that processes transformation instructions, and produces |
| <A href="#pattern-Templates">Templates</A> (in the technical |
| terminology). A <A href="#pattern-Templates">Templates</A> |
| object provides a <A href="#pattern-Transformer">Transformer</A>, which transforms one or |
| more <A href="#pattern-Source">Source</A>s into one or more |
| <A href="#pattern-Result">Result</A>s.</P> |
| |
| <P>To use the TrAX interface, you create a |
| <A href="#pattern-TransformerFactory">TransformerFactory</A>, |
| which may directly provide a <A href="#pattern-Transformer">Transformer</A>, or which can provide |
| <A href="#pattern-Templates">Templates</A> from a variety of |
| <A href="#pattern-Source">Source</A>s. The |
| <A href="#pattern-Templates">Templates</A> object is a processed |
| or compiled representation of the transformation instructions, and provides a |
| <A href="#pattern-Transformer">Transformer</A>. The |
| <A href="#pattern-Transformer">Transformer</A> processes a |
| <A href="#pattern-Transformer">Source</A> according to the |
| instructions found in the <A href="#pattern-Templates">Templates</A>, and produces a |
| <A href="#pattern-Result">Result</A>.</P> |
| |
| <P>The process of transformation from a tree, either in the form of an |
| object model, or in the form of parse events, into a stream, is known as |
| <I>serialization</I>.</P> |
| </FONT></TD></TR></TABLE><BR><A name="patterns"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="666699" colspan="2" width="494"><TABLE border="0" cellpadding="0" cellspacing="0" width="494"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="492"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>TrAX Patterns</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="492"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="492"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="484"><FONT color="#000000" face="arial,helvetica,sanserif"> |
| <P>The intent, responsibilities, and thread safety of TrAX objects:</P> |
| <UL> |
| <LI><A href="#pattern-Processor">Processor</A></LI> |
| <LI><A href="#pattern-TransformerFactory">TransformerFactory</A></LI> |
| <LI><A href="#pattern-Templates">Templates</A></LI> |
| <LI><A href="#pattern-Transformer">Transformer</A></LI> |
| <LI><A href="#pattern-Source">Source</A></LI> |
| <LI><A href="#pattern-Result">Result</A></LI> |
| </UL> |
| <A name="pattern-Processor"><!--anchor--></A><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="666699" colspan="2" width="484"><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="482"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Processor</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="474"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"> |
| <DL> |
| <DT>Intent</DT> |
| <DD>Generic concept for the |
| set of objects that implement the TrAX interfaces.</DD> |
| <DT>Responsibilities</DT> |
| <DD>Create compiled transformation instructions, transform |
| sources, and manage transformation parameters and |
| properties.</DD> |
| <DT>Thread safety</DT> |
| <DD>Only the Templates object can be |
| used concurrently in multiple threads. The rest of the processor does not do |
| synchronized blocking, and so may not be used to perform multiple concurrent |
| operations.</DD> |
| </DL> |
| </FONT></TD></TR></TABLE><BR> <A name="pattern-TransformerFactory"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="666699" colspan="2" width="484"><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="482"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>TransformerFactory</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="474"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"> |
| <DL> |
| <DT>Intent</DT> |
| <DD>Serve as a vendor-neutral Processor interface for |
| <A href="http://www.w3.org/TR/xslt">XSLT</A> and similar |
| processors.</DD> |
| <DT>Responsibilities</DT> |
| <DD>Serve as a factory for a concrete |
| implementation of an TransformerFactory, serve as a direct factory for |
| Transformer objects, serve as a factory for Templates objects, and manage |
| processor specific features.</DD> |
| <DT>Thread safety</DT> |
| <DD>A TransformerFactory may not perform mulitple concurrent |
| operations.</DD> |
| </DL> |
| </FONT></TD></TR></TABLE><BR><A name="pattern-Templates"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="666699" colspan="2" width="484"><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="482"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Templates</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="474"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"> |
| <DL> |
| <DT>Intent</DT> |
| <DD>The runtime representation of the transformation instructions.</DD> |
| <DT>Responsibilities</DT> |
| <DD>A data bag for transformation instructions; act as a factory |
| for Transformers.</DD> |
| <DT>Thread safety</DT> |
| <DD>Threadsafe for concurrent |
| usage over multiple threads once construction is complete.</DD> |
| </DL> |
| </FONT></TD></TR></TABLE><BR><A name="pattern-Transformer"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="666699" colspan="2" width="484"><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="482"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Transformer</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="474"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"> |
| <DL> |
| <DT>Intent</DT> |
| <DD>Act as a per-thread |
| execution context for transformations, act as an interface for performing the |
| transformation.</DD> |
| <DT>Responsibilities</DT> |
| <DD>Perform the |
| transformation.</DD> |
| <DT>Thread safety</DT> |
| <DD>Only one instance per thread |
| is safe.</DD> |
| </DL> |
| <TABLE border="0" cellpadding="0" cellspacing="3" width="100%"><TR><TD valign="top" width="20"><IMG alt="Note" border="0" height="24" hspace="0" src="resources/note.gif" vspace="0" width="20"></TD><TD valign="top"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"><I>The Transformer is bound to the Templates |
| object that created it.</I></FONT></TD></TR></TABLE> |
| </FONT></TD></TR></TABLE><BR><A name="pattern-Source"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="666699" colspan="2" width="484"><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="482"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Source</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="474"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"> |
| <DL> |
| <DT>Intent</DT> |
| <DD>Serve as a |
| single vendor-neutral object for multiple types of input.</DD> |
| <DT>Responsibilities</DT> |
| <DD>Act as simple data holder for System IDs, DOM nodes, streams, |
| etc.</DD> |
| <DT>Thread safety</DT> |
| <DD>Threadsafe concurrently over multiple |
| threads for read-only operations; must be synchronized for edit |
| operations.</DD> |
| </DL> |
| </FONT></TD></TR></TABLE><BR><A name="pattern-Result"><!--anchor--></A> |
| <TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="666699" colspan="2" width="484"><TABLE border="0" cellpadding="0" cellspacing="0" width="484"><TR><TD bgcolor="#039acc" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#039acc" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#039acc" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" width="482"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG alt="" border="0" height="2" hspace="0" src="resources/void.gif" vspace="0" width="2"><B>Result</B></FONT></TD><TD bgcolor="#017299" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#017299" height="1" width="482"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="482"></TD><TD bgcolor="#017299" height="1" width="1"><IMG alt="" border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></TD></TR><TR><TD width="10"> </TD><TD width="474"><FONT color="#000000" face="arial,helvetica,sanserif" size="-1"> |
| <DL> |
| <DT>Intent</DT> |
| <DD>Serve |
| as a single object for multiple types of output, so there can be simple process |
| method signatures.</DD> |
| <DT>Responsibilities</DT> |
| <DD>Act as simple data holder for |
| output stream, DOM node, ContentHandler, etc.</DD> |
| <DT>Thread safety</DT> |
| <DD>Threadsafe concurrently over multiple threads for read-only, |
| must be synchronized for edit.</DD> |
| </DL> |
| </FONT></TD></TR></TABLE><BR> |
| </FONT></TD></TR></TABLE><BR> |
| </TD></TR></TABLE></TD></TR></TABLE><BR><TABLE border="0" cellpadding="0" cellspacing="0" width="620"><TR><TD bgcolor="#0086b2"><IMG alt="dot" height="1" src="resources/dot.gif" width="1"></TD></TR><TR><TD align="center"><FONT color="#0086b2" size="-1"><I> |
| Copyright © 2006 The Apache Software Foundation. |
| All Rights Reserved. |
| </I></FONT></TD></TR></TABLE></BODY></HTML> |