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## net.sf.saxon.s9api
Class XQueryCompiler

    java.lang.Object
      net.sf.saxon.s9api.XQueryCompiler

    public class XQueryCompiler

extends Object

An XQueryCompiler object allows XQuery 1.0 queries to be compiled. The compiler holds information that represents the static context for the compilation.

To construct an XQueryCompiler, use the factory method `Processor.newXQueryCompiler()`.

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

Since:
  9.0

Constructor Summary
`protected` | `XQueryCompiler(Processor processor)` Protected constructor

Method Summary
`XQueryExecutable` | `compile(File query)` Compile a query supplied as a file
`XQueryExecutable` | `compile(InputStream query)` Compile a query supplied as an InputStream
`XQueryExecutable` | `compile(Reader query)` Compile a query supplied as a Reader
`XQueryExecutable` | `compile(String query)` Compile a query supplied as a string.
`void` | `compileLibrary(File query)` Compile a library module supplied as a file.
`void` | `compileLibrary(InputStream query)` Compile a library module supplied as an InputStream.
`void` | `compileLibrary(Reader query)` Compile a library module supplied as a Reader.
`void` | `compileLibrary(String query)` Compile a library module supplied as a string.
`void` | `declareNamespace(String prefix, String uri)` Declare a namespace binding as part of the static context for queries compiled using this XQueryCompiler.
`URI` | `getBaseURI()` Get the static base URI for the query
`String` | `getEncoding()` Get the encoding previously set for the supplied query.
`ErrorListener` | `getErrorListener()` Get the ErrorListener being used during this compilation episode
`String` | `getLanguageVersion()` Ask whether an XQuery 1.0 or XQuery 1.1 processor is being used
`ModuleURIResolver` | `getModuleURIResolver()` Get the user-defined ModuleURIResolver for resolving URIs used in `import module` declarations in the XQuery prolog; returns null if none has been explicitly set either here or in the Saxon Configuration.
`Processor` | `getProcessor()` Get the Processor from which this XQueryCompiler was constructed
`ItemType` | `getRequiredContextItemType()` Get the required type of the context item.
`StaticQueryContext` | `getUnderlyingStaticContext()` Get the underlying `StaticQueryContext` object that maintains the static context information on behalf of this XQueryCompiler.
`boolean` | `isCompileWithTracing()` Ask whether trace hooks are included in the compiled code.
`boolean` | `isSchemaAware()` Ask whether schema-awareness has been requested either by means of a call on `setSchemaAware(boolean)`
`boolean` | `isUpdatingEnabled()` Ask whether the query is allowed to use XQuery Update syntax
`void` | `setBaseURI(URI baseURI)` Set the static base URI for the query
`void` | `setCompileWithTracing(boolean option)` Set whether trace hooks are to be included in the compiled code.
`void` | `setEncoding(String encoding)` Set the encoding of the supplied query.
`void` | `setErrorListener(ErrorListener listener)` Set the ErrorListener to be used during this query compilation episode
`void` | `setLanguageVersion(String version)` Say whether an XQuery 1.0 or XQuery 3.0 processor is required.
`void` | `setModuleURIResolver(ModuleURIResolver resolver)` Set a user-defined ModuleURIResolver for resolving URIs used in `import module` declarations in the XQuery prolog.
`void` | `setRequiredContextItemType(ItemType type)` Declare the static type of the context item.
`void` | `setSchemaAware(boolean schemaAware)` Say that the query must be compiled to be schema-aware, even if it contains no "import schema" declarations.
`void` | `setUpdatingEnabled(boolean updating)` Say whether the query is allowed to be updating.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### XQueryCompiler

    protected XQueryCompiler(Processor processor)

  Protected constructor

  Parameters:
    `processor` - the Saxon Processor

Method Detail

### getProcessor

    public Processor getProcessor()

  Get the Processor from which this XQueryCompiler was constructed

  Returns:
    the Processor to which this XQueryCompiler belongs
  Since:
    9.3

### setBaseURI

    public void setBaseURI(URI baseURI)

  Set the static base URI for the query

  Parameters:
    `baseURI` - the static base URI

### getBaseURI

    public URI getBaseURI()

  Get the static base URI for the query

  Returns:
    the static base URI

### setErrorListener

    public void setErrorListener(ErrorListener listener)

  Set the ErrorListener to be used during this query compilation episode

  Parameters:
    `listener` - The error listener to be used. This is notified of all errors detected during the compilation.

### getErrorListener

    public ErrorListener getErrorListener()

  Get the ErrorListener being used during this compilation episode

  Returns:
    listener The error listener in use. This is notified of all errors detected during the compilation. If no user-supplied ErrorListener has been set, returns the system-supplied ErrorListener.

### setCompileWithTracing

    public void setCompileWithTracing(boolean option)

  Set whether trace hooks are to be included in the compiled code. To use tracing, it is necessary both to compile the code with trace hooks included, and to supply a TraceListener at run-time

  Parameters:
    `option` - true if trace code is to be compiled in, false otherwise

### isCompileWithTracing

    public boolean isCompileWithTracing()

  Ask whether trace hooks are included in the compiled code.

  Returns:
    true if trace hooks are included, false if not.

### setModuleURIResolver

    public void setModuleURIResolver(ModuleURIResolver resolver)

  Set a user-defined ModuleURIResolver for resolving URIs used in `import module` declarations in the XQuery prolog. This will override any ModuleURIResolver that was specified as part of the configuration.

  Parameters:
    `resolver` - the ModuleURIResolver to be used

### getModuleURIResolver

    public ModuleURIResolver getModuleURIResolver()

  Get the user-defined ModuleURIResolver for resolving URIs used in `import module` declarations in the XQuery prolog; returns null if none has been explicitly set either here or in the Saxon Configuration.

  Returns:
    the registered ModuleURIResolver

### setEncoding

    public void setEncoding(String encoding)

  Set the encoding of the supplied query. This is ignored if the query is supplied in character form, that is, as a `String` or as a `Reader`. If no value is set, the query processor will attempt to infer the encoding, defaulting to UTF-8 if no information is available.

  Parameters:
    `encoding` - the encoding of the supplied query, for example "iso-8859-1"
  Since:
    9.1

### getEncoding

    public String getEncoding()

  Get the encoding previously set for the supplied query.

  Returns:
    the encoding previously set using `setEncoding(String)`, or null if no value has been set. Note that this is not necessarily the actual encoding of the query.
  Since:
    9.2

### setUpdatingEnabled

    public void setUpdatingEnabled(boolean updating)

  Say whether the query is allowed to be updating. XQuery update syntax will be rejected during query compilation unless this flag is set. XQuery Update is supported only under Saxon-EE.

  Parameters:
    `updating` - true if the query is allowed to use the XQuery Update facility (requires Saxon-EE). If set to false, the query must not be an updating query. If set to true, it may be either an updating or a non-updating query.
  Since:
    9.1

### isUpdatingEnabled

    public boolean isUpdatingEnabled()

  Ask whether the query is allowed to use XQuery Update syntax

  Returns:
    true if the query is allowed to use the XQuery Update facility. Note that this does not necessarily mean that the query is an updating query; but if the value is false, the it must definitely be non-updating.
  Since:
    9.1

### setSchemaAware

    public void setSchemaAware(boolean schemaAware)

  Say that the query must be compiled to be schema-aware, even if it contains no "import schema" declarations. Normally a query is treated as schema-aware only if it contains one or more "import schema" declarations. If it is not schema-aware, then all input documents must be untyped (or xs:anyType), and validation of temporary nodes is disallowed (though validation of the final result tree is permitted). Setting the argument to true means that schema-aware code will be compiled regardless.

  Parameters:
    `schemaAware` - If true, the stylesheet will be compiled with schema-awareness enabled even if it contains no xsl:import-schema declarations. If false, the stylesheet is treated as schema-aware only if it contains one or more xsl:import-schema declarations.
  Since:
    9.2

### isSchemaAware

    public boolean isSchemaAware()

  Ask whether schema-awareness has been requested either by means of a call on `setSchemaAware(boolean)`

  Returns:
    true if schema-awareness has been requested
  Since:
    9.2

### setLanguageVersion

    public void setLanguageVersion(String version)

  Say whether an XQuery 1.0 or XQuery 3.0 processor is required.

  Parameters:
    `version` - Must be "1.0" or "3.0". At present onle limited support for XQuery 3.01 is available. This functionality is available only in Saxon-EE, and it cannot be used in conjunction with XQuery Updates. To use XQuery 3.0 features, the query prolog must also specify version="3.0".

    In Saxon 9.3, the value "1.1" is accepted as a synonym for "3.0".

  Throws:
    `IllegalArgumentException` - if the version is not 1.0 or 3.0.
  Since:
    9.2

### getLanguageVersion

    public String getLanguageVersion()

  Ask whether an XQuery 1.0 or XQuery 1.1 processor is being used

  Returns:
    version: "1.0" or "3.0"
  Since:
    9.2

### declareNamespace

    public void declareNamespace(String prefix,
                                 String uri)

  Declare a namespace binding as part of the static context for queries compiled using this XQueryCompiler. This binding may be overridden by a binding that appears in the query prolog. The namespace binding will form part of the static context of the query, but it will not be copied into result trees unless the prefix is actually used in an element or attribute name.

  Parameters:
    `prefix` - The namespace prefix. If the value is a zero-length string, this method sets the default namespace for elements and types.
    `uri` - The namespace URI. It is possible to specify a zero-length string to "undeclare" a namespace; in this case the prefix will not be available for use, except in the case where the prefix is also a zero length string, in which case the absence of a prefix implies that the name is in no namespace.
  Throws:
    `NullPointerException` - if either the prefix or uri is null.
    `IllegalArgumentException` - in the event of an invalid declaration of the XML namespace

### setRequiredContextItemType

    public void setRequiredContextItemType(ItemType type)

  Declare the static type of the context item. If this type is declared, and if a context item is supplied when the query is invoked, then the context item must conform to this type (no type conversion will take place to force it into this type).

  Parameters:
    `type` - the required type of the context item

### getRequiredContextItemType

    public ItemType getRequiredContextItemType()

  Get the required type of the context item. If no type has been explicitly declared for the context item, an instance of AnyItemType (representing the type item()) is returned.

  Returns:
    the required type of the context item

### compileLibrary

    public void compileLibrary(String query)
                        throws SaxonApiException

  Compile a library module supplied as a string. The code generated by compiling the library is available for importing by all subsequent compilations using the same XQueryCompiler; it is identified by an "import module" declaration that specifies the module URI of the library module. No module location hint is required, and if one is present, it is ignored.

  The base URI of the query should be supplied by calling `setBaseURI(java.net.URI)`

  Separate compilation of library modules is supported only under Saxon-EE

  Parameters:
    `query` - the text of the query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
  Since:
    9.2

### compileLibrary

    public void compileLibrary(File query)
                        throws SaxonApiException,
                               IOException

  Compile a library module supplied as a file. The code generated by compiling the library is available for importing by all subsequent compilations using the same XQueryCompiler; it is identified by an "import module" declaration that specifies the module URI of the library module. No module location hint is required, and if one is present, it is ignored.

  The encoding of the input stream may be specified using `setEncoding(String)`; if this has not been set, the compiler determines the encoding from the version header of the query, and if that too is absent, it assumes UTF-8.

  Separate compilation of library modules is supported only under Saxon-EE

  Parameters:
    `query` - the file containing the query. The URI corresponding to this file will be used as the base URI of the query, overriding any URI supplied using `setBaseURI(java.net.URI)` (but not overriding any base URI specified within the query prolog)
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
    `IOException` - if the file does not exist or cannot be read
  Since:
    9.2

### compileLibrary

    public void compileLibrary(Reader query)
                        throws SaxonApiException

  Compile a library module supplied as a Reader. The code generated by compiling the library is available for importing by all subsequent compilations using the same XQueryCompiler; it is identified by an "import module" declaration that specifies the module URI of the library module. No module location hint is required, and if one is present, it is ignored.

  The base URI of the query should be supplied by calling `setBaseURI(java.net.URI)`

  Separate compilation of library modules is supported only under Saxon-EE

  Parameters:
    `query` - the text of the query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
  Since:
    9.2

### compileLibrary

    public void compileLibrary(InputStream query)
                        throws SaxonApiException

  Compile a library module supplied as an InputStream. The code generated by compiling the library is available for importing by all subsequent compilations using the same XQueryCompiler; it is identified by an "import module" declaration that specifies the module URI of the library module. No module location hint is required, and if one is present, it is ignored.

  The encoding of the input stream may be specified using `setEncoding(String)`; if this has not been set, the compiler determines the encoding from the version header of the query, and if that too is absent, it assumes UTF-8.

  The base URI of the query should be supplied by calling `setBaseURI(java.net.URI)`

  Separate compilation of library modules is supported only under Saxon-EE

  Parameters:
    `query` - the text of the query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
  Since:
    9.2

### compile

    public XQueryExecutable compile(String query)
                             throws SaxonApiException

  Compile a query supplied as a string.

  The base URI of the query should be supplied by calling `setBaseURI(java.net.URI)`

  Parameters:
    `query` - the text of the query
  Returns:
    an XQueryExecutable representing the compiled query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
  Since:
    9.0

### compile

    public XQueryExecutable compile(File query)
                             throws SaxonApiException,
                                    IOException

  Compile a query supplied as a file

  Parameters:
    `query` - the file containing the query. The URI corresponding to this file will be used as the base URI of the query, overriding any URI supplied using `setBaseURI(java.net.URI)` (but not overriding any base URI specified within the query prolog)
  Returns:
    an XQueryExecutable representing the compiled query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
    `IOException` - if the file does not exist or cannot be read
  Since:
    9.1

### compile

    public XQueryExecutable compile(InputStream query)
                             throws SaxonApiException,
                                    IOException

  Compile a query supplied as an InputStream

  The base URI of the query should be supplied by calling `setBaseURI(java.net.URI)`

  Parameters:
    `query` - the input stream on which the query is supplied. This will be consumed by this method
  Returns:
    an XQueryExecutable representing the compiled query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
    `IOException` - if the file does not exist or cannot be read
  Since:
    9.1

### compile

    public XQueryExecutable compile(Reader query)
                             throws SaxonApiException,
                                    IOException

  Compile a query supplied as a Reader

  The base URI of the query should be supplied by calling `setBaseURI(java.net.URI)`

  Parameters:
    `query` - the input stream on which the query is supplied. This will be consumed by this method
  Returns:
    an XQueryExecutable representing the compiled query
  Throws:
    `SaxonApiException` - if the query compilation fails with a static error
    `IOException` - if the file does not exist or cannot be read
  Since:
    9.1

### getUnderlyingStaticContext

    public StaticQueryContext getUnderlyingStaticContext()

  Get the underlying `StaticQueryContext` object that maintains the static context information on behalf of this XQueryCompiler. This method provides an escape hatch to internal Saxon implementation objects that offer a finer and lower-level degree of control than the s9api classes and methods. Some of these classes and methods may change from release to release.

  Returns:
    the underlying StaticQueryContext object
  Since:
    9.2

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