Saxon.Api

 

 

Saxon.Api

Class XsltCompiler


public class XsltCompiler
extends object

An XsltCompiler object allows XSLT 3.0 stylesheets to be compiled. The compiler holds information that represents the static context for the compilation.

To construct an XsltCompiler, use the factory method NewXsltCompiler on the Processor object.

An XsltCompiler may be used repeatedly to compile multiple queries. Any changes made to the XsltCompiler (that is, to the static context) do not affect queries that have already been compiled. An XsltCompiler may be used concurrently in multiple threads, but it should not then be modified once initialized.

Property Summary

 bool AssertionsEnabled

Indicates whether or not assertions (xsl:assert instructions) are enabled at compile time.

 Uri BaseUri

The base URI of the stylesheet, which forms part of the static context of the stylesheet. This is used for resolving any relative URIs appearing within the stylesheet, for example in xsl:include and xsl:import declarations, in schema locations defined to xsl:import-schema, or as an argument to the document() or doc() function.

 bool ByteCodeEnabled

This property determines whether bytecode is to be generated in the compiled stylesheet.

 string DefaultCollationName

The name of the default collation used by stylesheets compiled using this XsltCompiler. This must be the name of a collation that is known to the Processor.

 IList<StaticError> ErrorList

List of errors. The caller should supply an empty list before calling Compile; the processor will then populate the list with error information obtained during the compilation. Each error will be included as an object of type StaticError. If no error list is supplied by the caller, error information will be written to an error list allocated by the system, which can be obtained as the value of this property.

 bool FastCompliation

Property to check and set fast compilation. Fast compilation will generally be achieved at the expense of run-time performance and quality of diagnostics. Fast compilation is a good trade-off if (a) the stylesheet is known to be correct, and (b) once compiled, it is only executed once against a document of modest size.

 Processor Processor

The Processor from which this XsltCompiler was constructed

 bool SchemaAware

The SchemaAware property determines whether the stylesheet is schema-aware. By default, a stylesheet is schema-aware if it contains one or more xsl:import-schema declarations. This option allows a stylesheet to be marked as schema-aware even if it does not contain such a declaration.

 XmlResolver XmlResolver

An XmlResolver, which will be used to resolve URI references while compiling a stylesheet.

 string XsltLanguageVersion

The XsltLanguageVersion property determines the version of the XSLT language specification implemented by the compiler. In this Saxon release the value is always "3.0".

 

Method Summary

 XsltExecutable Compile(Stream input)

Compile a stylesheet supplied as a Stream.

 XsltExecutable Compile(Stream input)

Compile a library package.

 XsltExecutable Compile(Uri sources)

Compile a list of packages.

 XsltExecutable Compile(TextReader input)

Compile a stylesheet supplied as a TextReader.

 XsltExecutable Compile(Uri uri)

Compile a stylesheet, retrieving the source using a URI.

 XsltExecutable CompileAssociatedStylesheet(XdmNode source)

Locate and compile a stylesheet identified by an <?xml-stylesheet?> processing instruction within a source document.

 XsltPackage CompilePackage(Stream input)

Compile a library package.

 IList<XsltPackage> CompilePackages(IList<string> sources)

Deprecated CompilePackages is deprecated, please use configuration to add list of packages.

 void DeclareCollation(Uri uri, CompareInfo compareInfo, CompareOptions options, bool isDefault)

Deprecated Declare collations globally at the Processor level.

 net.sf.saxon.trans.CompilerInfo GetUnderlyingCompilerInfo()

Get the underlying CompilerInfo object, which provides more detailed (but less stable) control over some compilation options

 void ImportPackage(XsltPackage thePackage)

Import a library package. Calling this method makes the supplied package available for reference in the xsl:use-package declaration of subsequent compilations performed using this XsltCompiler.

 void ImportPackage(XsltPackage thePackage, string packageName, string version)

Import a library package. Calling this method makes the supplied package available for reference in the xsl:use-package declaration of subsequent compilations performed using this XsltCompiler.

 XsltExecutable LoadExecutablePackage(Uri location)

Load a compiled package from a file or from a remote location, with the intent to use this as a complete executable stylesheet, not as a library package.

 XsltPackage LoadLibraryPackage(Uri location)

Load a compiled package from a file or from a remote location.

 void SetParameter(QName name, XdmValue value)

Externally set the value of a static parameter (new facility in XSLT 3.0)

 

Property Detail

AssertionsEnabled

public bool AssertionsEnabled {get; set; }

Indicates whether or not assertions (xsl:assert instructions) are enabled at compile time.

By default assertions are disabled at compile time. If assertions are enabled at compile time, then by default they will also be enabled at run time; but they can be disabled at run time by specific request. At compile time, assertions can be enabled for some packages and disabled for others; at run time, they can only be enabled or disabled globally.

Returns:

true if assertions are enabled at compile time

BaseUri

public Uri BaseUri {get; set; }

The base URI of the stylesheet, which forms part of the static context of the stylesheet. This is used for resolving any relative URIs appearing within the stylesheet, for example in xsl:include and xsl:import declarations, in schema locations defined to xsl:import-schema, or as an argument to the document() or doc() function.

This base URI is used only if the input supplied to the Compile method does not provide its own base URI. It is therefore used on the version of the method that supplies input from a Stream. On the version that supplies input from an XmlReader, this base URI is used only if the XmlReader does not have its own base URI.

ByteCodeEnabled

public bool ByteCodeEnabled {set; }

This property determines whether bytecode is to be generated in the compiled stylesheet.

Bytecode generation is enabled by default in Saxon-EE, but can be disabled by clearing this property. In Saxon-HE and Saxon-PE, attempting to set this property to true either has no effect, or causes an error.

Setting this property on causes bytecode to be generated for sections of the stylesheet that are executed frequently enough to justify it. It does not force immediate (eager) byte code generation.

Returns:

true if bytecode is to be generated, false if not

DefaultCollationName

public string DefaultCollationName {get; set; }

The name of the default collation used by stylesheets compiled using this XsltCompiler. This must be the name of a collation that is known to the Processor.

ErrorList

public IList<StaticError> ErrorList {get; set; }

List of errors. The caller should supply an empty list before calling Compile; the processor will then populate the list with error information obtained during the compilation. Each error will be included as an object of type StaticError. If no error list is supplied by the caller, error information will be written to an error list allocated by the system, which can be obtained as the value of this property.

By supplying a custom List with a user-written add() method, it is possible to intercept error conditions as they occur.

FastCompliation

public bool FastCompliation {get; set; }

Property to check and set fast compilation. Fast compilation will generally be achieved at the expense of run-time performance and quality of diagnostics. Fast compilation is a good trade-off if (a) the stylesheet is known to be correct, and (b) once compiled, it is only executed once against a document of modest size.

Fast compilation may result in static errors going unreported, especially if they occur in code that is never executed.

The current implementation is equivalent to switching off all optimizations other than just-in-time compilation of template rules. Setting this option, however, indicates an intent rather than a mechanism, and the implementation details may change in future to reflect the intent.

Set to true to request fast compilation; set to false to revert to the optimization options defined in the Configuration.

Processor

public Processor Processor {get; }

The Processor from which this XsltCompiler was constructed

SchemaAware

public bool SchemaAware {get; set; }

The SchemaAware property determines whether the stylesheet is schema-aware. By default, a stylesheet is schema-aware if it contains one or more xsl:import-schema declarations. This option allows a stylesheet to be marked as schema-aware even if it does not contain such a declaration.

If the stylesheet is not schema-aware, then schema-validated input documents will be rejected.

The reason for this option is that it is expensive to generate code that can handle typed input documents when they will never arise in practice.

The initial setting of this property is false, regardless of whether or not the Processor is schema-aware. Setting this property to true if the processor is not schema-aware will cause an Exception.

XmlResolver

public XmlResolver XmlResolver {get; set; }

An XmlResolver, which will be used to resolve URI references while compiling a stylesheet.

If no XmlResolver is set for the XsltCompiler, the XmlResolver that is used is the one that was set on the Processor at the time NewXsltCompiler was called.

XsltLanguageVersion

public string XsltLanguageVersion {get; set; }

The XsltLanguageVersion property determines the version of the XSLT language specification implemented by the compiler. In this Saxon release the value is always "3.0".

Getting this property always returns "3.0".

Setting this property has no effect.

Method Detail

Compile

public XsltExecutable Compile(Stream input)

Compile a stylesheet supplied as a Stream.

If the stylesheet contains any xsl:include or xsl:import declarations, then the BaseUri property must be set to allow these to be resolved.

The stylesheet is contained in the part of the input stream between its current position and the end of the stream. It is the caller's responsibility to close the input stream after use. If the compilation succeeded, then on exit the stream will be exhausted; if compilation failed, the current position of the stream on exit is undefined.

Parameters:

input - A stream containing the source text of the stylesheet

Returns:

An XsltExecutable which represents the compiled stylesheet object. The XsltExecutable may be loaded as many times as required, in the same or a different thread. The XsltExecutable is not affected by any changes made to the XsltCompiler once it has been compiled.

Compile

public XsltExecutable Compile(Stream input)

Compile a library package.

The source argument identifies an XML file containing an xsl:package element. Any packages on which this package depends must have been made available to the XsltCompiler by importing them using XsltCompiler.ImportPackage(XsltPackage).

Parameters:

input - source identifies an XML document holding the the XSLT package to be compiled

Returns:

The XsltPackage that results from the compilation. Note that this package is not automatically imported to this XsltCompiler; if the package is required for use in subsequent compilations then it must be explicitly imported.

Compile

public XsltExecutable Compile(Uri sources)

Compile a list of packages.

Parameters:

sources -  the collection of packages to be compiled, in the form of an Iterable

Returns:

the collection of compiled packages, in the form of an Iterable

Compile

public XsltExecutable Compile(TextReader input)

Compile a stylesheet supplied as a TextReader.

If the stylesheet contains any xsl:include or xsl:import declarations, then the BaseUri property must be set to allow these to be resolved.

The stylesheet is contained in the part of the input stream between its current position and the end of the stream. It is the caller's responsibility to close the TextReader after use. If the compilation succeeded, then on exit the stream will be exhausted; if compilation failed, the current position of the stream on exit is undefined.

Parameters:

input - A TextReader containing the source text of the stylesheet

Returns:

An XsltExecutable which represents the compiled stylesheet object. The XsltExecutable may be loaded as many times as required, in the same or a different thread. The XsltExecutable is not affected by any changes made to the XsltCompiler once it has been compiled.

Compile

public XsltExecutable Compile(Uri uri)

Compile a stylesheet, retrieving the source using a URI.

The document located via the URI is parsed using the System.Xml parser. This URI is used as the base URI of the stylesheet: the BaseUri property of the Compiler is ignored.

Parameters:

uri - The URI identifying the location where the stylesheet document can be found

Returns:

An XsltExecutable which represents the compiled stylesheet object. The XsltExecutable may be run as many times as required, in the same or a different thread. The XsltExecutable is not affected by any changes made to the XsltCompiler once it has been compiled.

CompileAssociatedStylesheet

public XsltExecutable CompileAssociatedStylesheet(XdmNode source)

Locate and compile a stylesheet identified by an <?xml-stylesheet?> processing instruction within a source document.

There are some limitations in the current implementation. The media type is ignored, as are the other parameters of the xml-stylesheet instruction. The href attribute must either reference an embedded stylesheet within the same document or a non-embedded external stylesheet.

Parameters:

source - The document node of the source document containing the xml-stylesheet processing instruction.

Returns:

An XsltExecutable which represents the compiled stylesheet object.

CompilePackage

public XsltPackage CompilePackage(Stream input)

Compile a library package.

The source argument identifies an XML file containing an xsl:package element. Any packages on which this package depends must have been made available to the XsltCompiler by importing them using XsltCompiler.ImportPackage(XsltPackage).

Parameters:

input - source identifies an XML document holding the the XSLT package to be compiled

Returns:

The XsltPackage that results from the compilation. Note that this package is not automatically imported to this XsltCompiler; if the package is required for use in subsequent compilations then it must be explicitly imported.

CompilePackages

public IList<XsltPackage> CompilePackages(IList<string> sources)

Deprecated CompilePackages is deprecated, please use configuration to add list of packages.

Compile a list of packages.

Parameters:

sources -  the collection of packages to be compiled, in the form of an Iterable

Returns:

the collection of compiled packages, in the form of an Iterable

DeclareCollation

public void DeclareCollation(Uri uri,
CompareInfo compareInfo,
CompareOptions options,
bool isDefault)

Deprecated Declare collations globally at the Processor level.

Create a collation based on a given CompareInfo and CompareOptions.

In the current and recent releases of Saxon, collations are always defined at the level of a Configuration. Declaring a collation here may therefore have wider effects than intended. It is recommended not to use this method, but to use Processor.DeclareCollation(Uri,CompareInfo,CompareOptions) instead.

Parameters:

uri - The collation URI to be used within the XPath expression to refer to this collation
compareInfo - The CompareInfo, which determines the language-specific collation rules to be used
options - Options to be used in performing comparisons, for example whether they are to be case-blind and/or accent-blind
isDefault - If true, this collation will be used as the default collation

GetUnderlyingCompilerInfo

public net.sf.saxon.trans.CompilerInfo GetUnderlyingCompilerInfo()

Get the underlying CompilerInfo object, which provides more detailed (but less stable) control over some compilation options

Returns:

the underlying CompilerInfo object, which holds compilation-time options. The methods on this object are not guaranteed stable from release to release.

ImportPackage

public void ImportPackage(XsltPackage thePackage)

Import a library package. Calling this method makes the supplied package available for reference in the xsl:use-package declaration of subsequent compilations performed using this XsltCompiler.

since 9.6

Parameters:

thePackage -  the package to be imported

ImportPackage

public void ImportPackage(XsltPackage thePackage,
string packageName,
string version)

Import a library package. Calling this method makes the supplied package available for reference in the xsl:use-package declaration of subsequent compilations performed using this XsltCompiler.

since 9.8

Parameters:

thePackage -  the package to be imported
packageName -  name of the package to be imported
version -  version identifier for the package to be imported

LoadExecutablePackage

public XsltExecutable LoadExecutablePackage(Uri location)

Load a compiled package from a file or from a remote location, with the intent to use this as a complete executable stylesheet, not as a library package.

The supplied URI represents the location of a resource which must have been originally created using XsltPackage.Save(Stream).

Parameters:

location -  the location from which the package is to be loaded, as a URI

Returns:

the compiled package loaded from the supplied file or remote location

LoadLibraryPackage

public XsltPackage LoadLibraryPackage(Uri location)

Load a compiled package from a file or from a remote location.

The supplied URI represents the location of a resource which must have been originally created using XsltPackage.Save(Stream). The result of loading the package is returned as an XsltPackage object. Note that this package is not automatically imported to this XsltCompiler; if the package is required for use in subsequent compilations then it must be explicitly imported.

Parameters:

location - the location from which the package is to be loaded, as a URI

Returns:

the compiled package loaded from the supplied file or remote location

SetParameter

public void SetParameter(QName name,
XdmValue value)

Externally set the value of a static parameter (new facility in XSLT 3.0)

Parameters:

name - The name of the parameter, expressed as a QName. If a parameter of this name has been declared in the stylesheet, the given value will be assigned to the variable. If the variable has not been declared, calling this method has no effect (it is not an error).
value - The value to be given to the parameter. If the parameter declaration defines a required type for the variable, then this value will be converted in the same way as arguments to function calls (for example, numeric promotion is applied).