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Xalan-C++ Samples
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Xalan-C++ Samples

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Samples to help you get started

Each of the subdirectories in the Xalan-C++ samples directory contains the source files for a sample application. The executables for the samples are in the build subdirectory, which should be on the system path.

With most of the samples, you can use the following procedure:

  1. Go to the samples subdirectory containing the sample (use the DOS shell if you are running Windows)

  2. Run the sample from the command line (as indicated below)

  3. Examine the application source files. You may also want to modify the source files. Remember that if you modify a .cpp file, you must rebuild the executable and place it on the path before you can run the modified application.
note Each sample application looks for input files in the current directory, the directory from which you run the application. The input files are in the samples subdirectory along with the sample source files. For the UNIX builds, application executables are in the bin subdirectory. For the Windows32 build, the application executable is in the bin subdirectory (Xalan-C_1_11_0-<my_Windows_distribution>\bin). To run a sample, be sure the executable is on the path, and run it from the samples subdirectory that contains the input files.
note The most of the samples are implemented without providing a pluggable memory manager. The SimpleTransform sample illustrates, in addition to a simple transformation, the usage of the processor with memory manager

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Rebuilding a Sample application

Instructions for rebuilding the samples differ depending on whether you are using the binary package or the source package.

For Windows users, the Xalan Visual C++ workspace contains project configurations for building each of the samples. Users who have downloaded the source package, can find the XalanICU.dsw workspace file under:

     Xalan-C_1_11_0-src\src\xalanc\Projects\Win32\VC6

and XalanICU.sln solution file under:

     Xalan-C_1_11_0-src\src\xalanc\Projects\Win32\VC7.1

Users who have downloaded the binary package, should use the Samples.dsw workspace file located under:

      Xalan-C_1_11_0-<my_Win32_distribution>\Samples\Projects\Win32\VC6

or the Samples.sln solution file for .NET V7.1 users, located under:

      Xalan-C_1_11_0-<my_Win32_distribution>\Samples\Projects\Win32\VC7.1

The Makefile that comes with the UNIX distributions include targets for rebuilding one or all of the sample applications. To rebuild one or more sample applications from the UNIX source package, go to the Xalan-C_1_11_0-src directory and run

     gmake Target

where Target is Samples (all the samples), ApacheModuleXSLT, CompileStylesheet, DocumentBuilder, ExternalFunctions, ParsedSourceWrappers, SerializedNodeSet, SimpleTransform, SimpleXPathAPI, SimpleXPathCAPI, StreamTransform, ThreadSafe, TraceListen, TransformToXercesDOM, UseStylesheetParam, XalanTransform, or XalanTransformerCallback.

To rebuild the samples from the UNIX binary package, go to the ../samples directory of your installation, run the runConfigure utility for your target platform, and then run gmake. For example, AIX users would issue the following command:

     ./runConfigure -p aix -c xlc_r -x xlC_r
     cd samples

     gmake Target

where Target can be Samples (for building all samples), or the individual sample name as listed above.

note For information on building Apache Module, see ApacheModuleXSLT

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ApacheModuleXSLT

note This sample must be built with the Apache Web server, and the Xalan-C++ distribution files do not include a binary for ApacheModuleXSLT. Assuming you have installed the Apache server on your platform, you can use Visual C++ on Windows to build ApacheModuleXSLT.dll, or the Makefile on UNIX to build xslt_module (with the appropriate library suffix).

What it does: runs as an Apache module on an Apache Web server; performs transformations and returns the output to a Web browser. You configure Apache to respond to a given URL request for an output file (html or txt file in the configuration below) by applying an xsl stylesheet file to an xml document file (both with the specified name in a given location) and returning the transformation output to the client.

This sample also illustrates use of the XalanTransformer class and the C API defined in src/XalanTransformer/XalanCAPI.h. It returns transformation output in blocks to a callback function, which enables the browser to start displaying the result before the transformation has been completed.

note You may need to adjust the Visual C++ or Makefile settings to locate the required Apache header files. As shipped, the Visual C++ project file looks in \Apache Group\Apache\src\include, and the UNIX Makefile looks in usr/lib.

To build the Apache module, follow the instructions in Steps for doing a Windows build or Steps for doing a UNIX build. For UNIX platforms, you do the build with
gmake ApacheModuleXSLT.

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Setting up and using ApacheModuleXSLT

To use ApacheModuleXSLT, do the following:

  1. (UNIX only) Be sure the Xalan and Xerces libraries are on your library path (you can accomplish this by copying them to /usr/lib; see Setting up the path/library path), and copy the Apache module to /usr/lib/apache.

  2. Add LoadModule and (UNIX only) AddModule entries to the Apache configuration file: httpd.conf.

    Windows: LoadModule xslt_module Xalan-C_1_11_0-<my_Windows_distribution>\bin\ApacheModuleXSLT.dll

    UNIX: AddModule mod_xslt.c
            and
            LoadModule xslt_module /usr/lib/apache/mod_xslt. xx

    where xx is the appropriate library suffix for the UNIX platform ("so" or "a").

  3. Add a <Location> entry to httpd.conf that indicates where xml/xsl file pairs are to be found, and what target file extensions to recognize. We suggest the following:

    <Location /xslt>
      AddHandler mod_xslt .html
      AddHandler mod_xslt .txt
    </Location>

    This <Location> element instructs the module to respond to requests for xxx .html and xxx .txt files in the in the xslt subdirectory (under the document root; see next item) by applying the xxx .xsl stylesheet to xxx .xml (both in that directory) and returning the transformation result to the browser.

    For example, a request for foo.html instructs the module to apply foo.xsl to foo.xml and return the result.

    Note: It is up to the stylesheet to apply the appropriate xsl:output method to the output. Whether the user specifies html or txt is, of itself, immaterial.

  4. Put xml/xsl file pairs in the <Location> subdirectory (xslt in the example)) under the document root directory specified in httpd.conf by the DocumentRoot and <Directory> settings. Alternatively, you can modify these settings to point to Xalan-C_1_11_0-<my_UNIX_distribution>/samples/ApacheModuleXSLT, which includes an xslt subdirectory with xml/xsl file pairs (foo.xml/xsl, apachemod.xml/xsl).

  5. Start the Apache server.

  6. From a Web browser, call the module with a URL as follows:
    http:// serverName /xslt/ xxx .html
    where serverName is the Apache server (such as www.myServer.com) and xxx is the name of an xml/xsl pair of files (such as foo.xml and foo.xsl) in the xslt subdirectory under the DocumentRoot directory.

    For example,
    http://www.myServer.com/xslt/apachemod.html
    instructs ApacheModuleXSLT to apply the apachemod.xsl stylesheet to the apachemod.xml XML document (both files in the xslt directory under the Apache DocumentRoot directory) and return the transformation result to the browser.

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CompileStylesheet

What it does: Use a compiled stylesheet to perform a series of transformations.

You can run it from the CompileStylesheet subdirectory with

CompileStylesheet

See also: Compiling stylesheets.

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DocumentBuilder

What it does: Use a DocumentBuilder to programmatically construct an XML document, apply the foo.xsl stylesheet to this document, and write the ouput to foo.out.

You can run it from the DocumentBuilder subdirectory with

DocumentBuilder

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ExternalFunctions

What it does: implement, install, and illustrate the usage of three extension functions. The functions return a square root, a cube, and a string with the current date and time. The sample stylesheet (foo.xsl) gets the area of a cube and units of measurement from an XML document (foo.xml), computes the length of each side of a cube and the volume of the cube, and enters the date and time of the transformation. The output appears in foo.out.

Run this sample from the ExternalFunctions subdirectory with

ExternalFunctions

See also: Extension Functions.

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ParsedSourceWrappers

What it does: performs a transformation with input in the form of a pre-built XercesDOM or XalanSourceTree.

Run this sample from the ParsedSourceWrappers subdirectory with

ParsedSourceWrappers

See transformXercesDOM() and transformXalanSourceTree() as called by transform() in ParsedSourceWrappers.cpp.

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SerializeNodeSet

What it does: Serialize the node set returned by the application of an XPath expression to an XML document.

Run this sample from the SerializeNodeSet subdirectory with

SerializeNodeSet XMLFile ContextNode XPathExpression

where XMLFile is an XML source file, ContextNode is the location path to the context node, and XPathExpression is an XPath expression to apply to that context node. The SerializeNodeSet directory contains the same foo.xml sample source file as the preceding examples.

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SimpleTransform

What it does: The SimpleTransform class uses the foo.xsl stylesheet to transform foo.xml, and writes the output to foo.out. The source for this sample has been modified to demonstrate the usage of the new pluggable memory management feature.

You can run it from the SimpleTransform subdirectory with

SimpleTransform

See also: Basic procedures for performing XSL transformations.

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SimpleXPathAPI

What it does: Use the XPathEvaluator interface to evaluate an XPath expression from the specified context node of an XML file and display the nodeset returned by the expression.

note You can use this sample as an aid when you want to find out what a given XPath expression returns from a given context node in an XML file.

Run this sample from the SimpleXPathAPI subdirectory with

SimpleXPathAPI XMLFile ContextNode XPathExpression

where XMLFile is an XML source file, ContextNode is the location path to the context node, and XPathExpression is an XPath expression to apply to that context node.

note Keep in mind that the string value returned by an XPath expression is the string value of the first node in the nodeset returned by the expresssion.

The XPathWrapper subdirectory contains an XML file named xml.foo (part of it appears below).

<?xml version="1.0"?>
<doc>
  <name first="David" last="Marston">Mr. Marson</name>
  <name first="David" last="Bertoni">Mr. Bertoni</name>
  ...
  <name first="Paul" last="Dick">Mr. Dick</name>
</doc>

You can try command lines like

SimpleXPathAPI foo.xml /doc name/@last

and

SimpleXPathAPI foo.xml / '//name[position()="4"]/@first'

note If a SimpleXPathAPI argument includes characters (such as *) that the shell interprets incorrectly, enclose the argument in double quotes.

See also: Working with XPath expressions.

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SimpleXPathCAPI

What it does: Use the XPathEvaluator C interface to evaluate an XPath epxeression and display the string value returned by the epxression.

note Keep in mind that the string value returned by an XPath expression is the string value of the first node in the nodeset returned by the epxresssion.

Run this sample from the SimpleXPathCAPI subdirectory with

SimpleXPathCAPI XMLFile XPathExpression

where XMLFile is an XML source file, and XPathExpression is an XPath expression to apply to the XML source file. The SimpleXPathCAPI subdirectory contains an XML file named xml.foo identical to foo.xml in the preceding example.

You can try command lines like

SimpleXPathCAPI foo.xml /doc/name[3]

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StreamTransform

What it does: The StreamTransform class processes character input streams containing a stylesheet and an XML document, and writes the transformation output to a character output stream. This sample illustrates the process for working with stylesheets and documents that you assemble in memory.

You can run it from the SimpleTransform subdirectory with

StreamTransform

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ThreadSafe

What it does: Multiple threads use a single compiled stylesheet (StylesheetRoot) and DOM source tree (XalanNode) to perform transformations concurrently. The application tracks the progress of the threads in messages to the console, and each thread writes its own output file. Imagine a server application responding to multiple clients who happen to request the same transformation.

You can run it from the ThreadSafe subdirectory with

ThreadSafe

See also: Compiling stylesheets.

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TraceListen

What it does: Trace events during a transformation; the transformation uses birds.xsl to transform birds.xml and writes the output to birds.out.

You can run it from the TraceListen subdirectory with

TraceListen traceFlags

where traceFlags is one or more of the following:

  -tt (Trace the templates as they are being called)

  -tg (Trace each result tree generation event)

  -ts (Trace each selection event)

  -ttc (Trace the template children as they are being processed)

These flags are also available in the command-line utility (TestXSLT).

The core of this example is the following fragment:

// Set up a diagnostic writer to be used by the TraceListener...
XalanStdOutputStream  theStdErr(cerr);
XalanOutputStreamPrintWriter  diagnosticsWriter(theStdErr);
// Make sure that error reporting, which includes any TraceListener 
// output does not throw exceptions when transcoding, since that could 
// result in an exception being thrown while another exception is active.
// In particular, characters that the TraceListener writes might not be 
// representable in the local code page.
theStdErr.setThrowTranscodeException(false);

// Set up the TraceListener...
// traceTemplates, traceTemplateChildren, traceGenerationEvent,
// and TraceSelectionEvent are booleans set by the command line.
TraceListenerDefault theTraceListener(
        diagnosticsWriter,
        traceTemplates,
        traceTemplateChildren,
        traceGenerationEvent,
        traceSelectionEvent);

// Add the TraceListener to the XSLT processor...
theProcessor.setTraceSelects(traceSelectionEvent);
theProcessor.addTraceListener(&theTraceListener);

// Perform the transformation
....

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TransformToXercesDOM

What it does: Performs a simple transformation but puts the result in a Xerces DOMDocument

Run this sample from the TransformToXercesDOM subdirectory with

TransformToXercesDOM XMLFile XSLFile

where XMLFile is a source XML file, and XSLFile is the XLST input file. The program will use XSLFile to transform the input file XMLFile using Xerces DOM as the output destination.

See the FormatterToXercesDOM usage in the sample code.

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UseStylesheetParam

What it does: Performs a transformation using top-level stylesheet parameters. There are three supported types of parameters. One is a text string. A second is a number of type double. A nodeset or parsed document can also be used.

You can run it from the UseStylesheetParam subdirectory with

UseStylesheetParam xmlfile stylesheet outfile [options]

where the options are:

-s key "'String-Value'"
-n key Number
-d key "Document-URL"

The files used by the sample program and the top-level parameter nodesets for this illustration are to be in working directory in which the sample program runs.

Using the sample program:

UseStylesheetParam foo.xml foo.xslt foo.out \
-s stringA "'This is a test string value'" \
-n numberA 123.012345 \
-d parmA "parmA.xml" \
-d parmB "parmB.xml"

The parmA.xml and parmB.xml are parsed and converted to nodesets. The stylesheet foo.xslt merges the contents of foo.xml and the parameters into the foo.out file.

The source sample is implemented in C++. Another example is implemented in 'C' using the XalanCAPI library TestCAPIparm.c . The usage interface for both is the same.

See also: Setting stylesheet parameters.

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XalanTransform

What it does: XalanTransform uses the XalanTransformer class and the associated C++ API to apply an XSL stylesheet file to an XML document file and write the transformation output to either an output file or to a stream. XalanTransform takes command-line arguments for the XML document to be transformed, the XSL stylesheet to apply, and an optional output file argument. If you omit the third argument, XalanTransform writes the transformation output to a stream that is sent to standard out (the console).

You can run XalanTransform from the XalanTransform subdirectory with

XalanTransform foo.xml foo.xsl foo.out

Omit the third argument to write the transformation result to the console. See also: Using the XalanTransformer class..

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XalanTransformerCallback

What it does: Return transformation output in blocks to a callback function, which writes the output to a file. This sample illustrates the use of a callback function to incrementally process a transformation result, that is to begin working with the transformation result before the transformation has been completed. See Processing output incrementally.

You can run it from the XalanTransformerCallback subdirectory with

XalanTransformerCallback foo.xml foo.xsl [foo.out]

note If you omit the third argument, the transformation result is written to the console.

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