com.saxonica.xqj

Class SaxonXQDataSource

java.lang.Object

com.saxonica.xqj.SaxonXQDataSource

All Implemented Interfaces:

XQDataSource

public class SaxonXQDataSource
extends Object
implements XQDataSource

Saxon implementation of the XQJ XQDataSource interface. The first action of a client application is to instantiate a SaxonXQDataSource. This is done directly: there is no factory class as with JAXP. An application that does not want compile-time references to the Saxon XQJ implementation can instantiate this class dynamically using the reflection API (class.newInstance()).

For full Javadoc descriptions of the public methods, see the XQJ specification.

Constructor Summary

Constructors

Constructor and Description
SaxonXQDataSource() Create a SaxonXQDataSource using a default configuration.
SaxonXQDataSource(Configuration config) Create a Saxon XQDataSource with a specific configuration

Method Summary

Methods

Modifier and Type	Method and Description
String	getAllowExternalFunctions() Ask whether queries are allowed to call external functions.
Configuration	getConfiguration() Get the Saxon Configuration in use.
XQConnection	getConnection() Attempts to create a connection to an XML datasource.
XQConnection	getConnection(Connection con) Get a connection based on an underlying JDBC connection
XQConnection	getConnection(String username, String password) Get a connection, by supplying a username and password.
String	getDtdValidation() Ask whether source documents are to be parsed with DTD validation enabled
String	getExpandAttributeDefaults() Ask whether fixed or default values defined in a schema or DTD will be expanded
String	getExpandXInclude() Ask whether XInclude processing is to be applied to source documents
int	getLoginTimeout() Gets the maximum time in seconds that this datasource can wait while attempting to connect to a database.
PrintWriter	getLogWriter() Retrieves the log writer for this XQDataSource object.
String	getProperty(String name) Get a configuration property setting.
String	getRetainLineNumbers() Ask whether line and column information will be retained for source documents
String	getSchemaValidationMode() Ask whether source documents will be validated against a schema
String	getStripWhitespace() Ask whether whitespace will be stripped when loading source documents
String[]	getSupportedPropertyNames() Returns an array containing the property names supported by this XQDataSource.
String	getUseXsiSchemaLocation() Ask whether the schema processor is to take account of xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes encountered in an instance document being validated
String	getXmlVersion() Ask whether XML 1.0 or XML 1.1 rules for XML names are to be followed
String	getXsdVersion() Ask whether XML Schema 1.0 syntax must be used or whether XML Schema 1.1 features are allowed
void	registerExtensionFunction(ExtensionFunctionDefinition function) Register an extension function that is to be made available within any query.
void	setAllowExternalFunctions(String value) Say whether queries are allowed to call external functions.
void	setDtdValidation(String value) Say whether source documents are to be parsed with DTD validation enabled
void	setExpandAttributeDefaults(String value) Say whether whether fixed and default values defined in a schema or DTD will be expanded.
void	setExpandXInclude(String value) Say whether XInclude processing is to be applied to source documents
void	setLoginTimeout(int seconds) Sets the maximum time in seconds that this datasource will wait while attempting to connect to a database.
void	setLogWriter(PrintWriter out) Sets the log writer for this XQDataSource object to the given java.io.PrintWriter object.
void	setProperties(Properties props) Sets the data source properties from the specified Properties instance.
void	setProperty(String name, String value) Set a configuration property.
void	setRetainLineNumbers(String value) Say whether source documents should have line and column information retained.
void	setSchemaValidationMode(String value) Say whether source documents should be validated against a schema
void	setStripWhitespace(String value) Say whether whitespace should be stripped when loading source documents
void	setUseXsiSchemaLocation(String value) Say whether the schema processor is to take account of xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes encountered in an instance document being validated
void	setXmlVersion(String value) Say whether XML 1.0 or XML 1.1 rules for XML names are to be followed
void	setXsdVersion(String value) Say whether XML Schema 1.0 syntax must be used or whether XML Schema 1.1 features are allowed

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SaxonXQDataSource

public SaxonXQDataSource()

Create a SaxonXQDataSource using a default configuration. The Configuration will be an EE, PE, or HE configuration depending on the what is found on the classpath

SaxonXQDataSource

public SaxonXQDataSource(Configuration config)

Create a Saxon XQDataSource with a specific configuration

Parameters:

config - The Saxon configuration to be used

Method Detail

getConfiguration

public Configuration getConfiguration()

Get the Saxon Configuration in use. Changes made to this Configuration will affect this data source and XQJ connections created from it (either before or afterwards). Equally, changes made to this SaxonXQDataSource are reflected in the Configuration object (which means they also impact any other SaxonXQDataSource objects that share the same Configuration).

Returns:

the configuration in use.

getConnection

public XQConnection getConnection()
                           throws XQException

Description copied from interface: XQDataSource

Attempts to create a connection to an XML datasource.

Specified by:

getConnection in interface XQDataSource

Returns:

a connection to the XML datasource

Throws:

XQException - if a datasource access error occurs

getConnection

public XQConnection getConnection(Connection con)
                           throws XQException

Get a connection based on an underlying JDBC connection

Specified by:

getConnection in interface XQDataSource

Parameters:

con - the JDBC connection

Returns:

a connection based on an underlying JDBC connection

Throws:

XQException - The Saxon implementation of this method always throws an XQException, indicating that Saxon does not support connection to a JDBC data source.

getConnection

public XQConnection getConnection(String username,
                         String password)
                           throws XQException

Get a connection, by supplying a username and password. The Saxon implementation of this is equivalent to the default constructor: the username and password are ignored.

Specified by:

getConnection in interface XQDataSource

Parameters:

username - the user name

password - the password

Returns:

a connection

Throws:

XQException

getLoginTimeout

public int getLoginTimeout()

Description copied from interface: XQDataSource

Gets the maximum time in seconds that this datasource can wait while attempting to connect to a database. A value of zero means that the timeout is the default system timeout if there is one; otherwise, it means that there is no timeout. When a XQDataSource object is created, the login timeout is initially zero. It is implementation-defined whether the returned login timeout is actually used by the data source implementation.

Specified by:

getLoginTimeout in interface XQDataSource

Returns:

the datasource login time limit

getLogWriter

public PrintWriter getLogWriter()

Description copied from interface: XQDataSource

Retrieves the log writer for this XQDataSource object. The log writer is a character output stream to which all logging and tracing messages for this datasource will be printed. This includes messages printed by the methods of this object, messages printed by methods of other objects manufactured by this object, and so on. When a XQDataSource object is created, the log writer is initially null; in other words, the default is for logging to be disabled.

Specified by:

getLogWriter in interface XQDataSource

Returns:

the log writer for this datasource or null if logging is disabled

getProperty

public String getProperty(String name)
                   throws XQException

Get a configuration property setting. The properties that are supported, and their meanings, are the same as the properties that can be obtained using "get" methods; for example getProperty("dtdValidation") returns the same result as getDtdValidation().

Further Saxon configuration properties are available using the URIs defined as constants in FeatureKeys

Specified by:

getProperty in interface XQDataSource

Parameters:

name - the name of the configuration property

Returns:

the value of the configuration property. Note that in the case of on/off properties this will be returned as the string true/false

Throws:

XQException

getSupportedPropertyNames

public String[] getSupportedPropertyNames()

Description copied from interface: XQDataSource

Returns an array containing the property names supported by this XQDataSource. Implementations that support user name and password must recognize the user name and password properties listed below.

user	the user name to use for creating a connection
password	the password to use for creating a connection

Any additional properties are implementation-defined.

Specified by:

getSupportedPropertyNames in interface XQDataSource

Returns:

String[] an array of property names supported by this implementation

setLoginTimeout

public void setLoginTimeout(int seconds)
                     throws XQException

Description copied from interface: XQDataSource

Sets the maximum time in seconds that this datasource will wait while attempting to connect to a database. A value of zero specifies that the timeout is the default system timeout if there is one; otherwise, it specifies that there is no timeout. When a XQDataSource object is created, the login timeout is initially zero. It is implementation-defined whether the specified login timeout is actually used by the data source implementation. If the connection is created over an existing JDBC connection, then the login timeout value from the underlying JDBC connection may be used.

Specified by:

setLoginTimeout in interface XQDataSource

Parameters:

seconds - the datasource login time limit

Throws:

XQException - if a datasource access error occurs

setLogWriter

public void setLogWriter(PrintWriter out)
                  throws XQException

Description copied from interface: XQDataSource

Sets the log writer for this XQDataSource object to the given java.io.PrintWriter object. The log writer is a character output stream to which all logging and tracing messages for this datasource will be printed. This includes messages printed by the methods of this object, messages printed by methods of other objects manufactured by this object, and so on. When a XQDataSource object is created the log writer is initially null; in other words, the default is for logging to be disabled.

Specified by:

setLogWriter in interface XQDataSource

Parameters:

out - the new log writer; to disable logging, set to null

Throws:

XQException - if a datasource access error occurs

setProperties

public void setProperties(Properties props)
                   throws XQException

Description copied from interface: XQDataSource

Sets the data source properties from the specified Properties instance. Properties set before this call will still apply but those with the same name as any of these properties will be replaced. Properties set after this call also apply and may replace properties set during this call.

If the implementation does not support one or more of the given property names, or if it can determine that the value given for a specific property is invalid, then an exception is thrown. If an exception is thrown, then no previous value is overwritten. is invalid, then an exception is raised.

Specified by:

setProperties in interface XQDataSource

Parameters:

props - the list of properties to set

Throws:

XQException - if (1) a given property is not recognized, (2) the value for a given property is determined to be invalid, or (3) the props parameter is null

setProperty

public void setProperty(String name,
               String value)
                 throws XQException

Set a configuration property. The properties that are supported, and their meanings, are the same as the properties that can be obtained using "set" methods; for example setProperty("dtdValidation", "true") has the same effect as setDtdValidation("true").

Further Saxon configuration properties are available using the URIs defined as constants in FeatureKeys

Specified by:

setProperty in interface XQDataSource

Parameters:

name - the name of the configuration property

value - the value of the configuration property

Throws:

XQException

setAllowExternalFunctions

public void setAllowExternalFunctions(String value)

Say whether queries are allowed to call external functions.

Parameters:

value - set to "true" if external function calls are allowed (default) or "false" otherwise

getAllowExternalFunctions

public String getAllowExternalFunctions()

Ask whether queries are allowed to call external functions.

Returns:

"true" if external function calls are allowed, "false" otherwise

setDtdValidation

public void setDtdValidation(String value)

Say whether source documents are to be parsed with DTD validation enabled

Parameters:

value - "true" if DTD validation is to be enabled, otherwise "false". Default is "false".

getDtdValidation

public String getDtdValidation()

Ask whether source documents are to be parsed with DTD validation enabled

Returns:

"true" if DTD validation is to be enabled, otherwise "false". Default is "false".

setExpandAttributeDefaults

public void setExpandAttributeDefaults(String value)

Say whether whether fixed and default values defined in a schema or DTD will be expanded. By default, or if the value is "true" (and for conformance with the specification) validation against a DTD or schema will cause default values defined in the schema or DTD to be inserted into the document. Setting this feature to "false" suppresses this behaviour. In the case of DTD-defined defaults this only works if the XML parser reports whether each attribute was specified in the source or generated by expanding a default value. Not all XML parsers report this information.

Parameters:

value - "true" if default values are to be expanded, otherwise "false". Default is "true".

getExpandAttributeDefaults

public String getExpandAttributeDefaults()

Ask whether fixed or default values defined in a schema or DTD will be expanded

Returns:

"true" if such values will be expanded, otherwise "false"

setExpandXInclude

public void setExpandXInclude(String value)

Say whether XInclude processing is to be applied to source documents

Parameters:

value - "true" if XInclude directives are to expanded, otherwise "false". Default is "false".

getExpandXInclude

public String getExpandXInclude()

Ask whether XInclude processing is to be applied to source documents

Returns:

"true" if XInclude directives are to expanded, otherwise "false". Default is "false".

setRetainLineNumbers

public void setRetainLineNumbers(String value)

Say whether source documents should have line and column information retained. This information is available via extension functions saxon:line-number() and saxon:column-number()

Parameters:

value - "true" if line and column information is to be retained, otherwise "false". Default is "false".

getRetainLineNumbers

public String getRetainLineNumbers()

Ask whether line and column information will be retained for source documents

Returns:

"true" if line and column information is retained, otherwise "false"

setSchemaValidationMode

public void setSchemaValidationMode(String value)

Say whether source documents should be validated against a schema

Parameters:

value - set to "strict" if source documents are to be subjected to strict validation, "lax" if source documents are to be subjected to lax validation, "skip" if source documents are not to be subjected to schema validation

getSchemaValidationMode

public String getSchemaValidationMode()

Ask whether source documents will be validated against a schema

Returns:

"strict" if source documents are to be subjected to strict validation, "lax" if source documents are to be subjected to lax validation, "skip" if source documents are not to be subjected to schema validation

setStripWhitespace

public void setStripWhitespace(String value)

Say whether whitespace should be stripped when loading source documents

Parameters:

value - "all" if all whitespace text nodes are to be stripped, "ignorable" if only whitespace text nodes in elements defined in a schema or DTD as having element-only content are to be stripped, "none" if no whitespace text nodes are to be stripped

getStripWhitespace

public String getStripWhitespace()

Ask whether whitespace will be stripped when loading source documents

Returns:

"all" if all whitespace text nodes are to be stripped, "ignorable" if only whitespace text nodes in elements defined in a schema or DTD as having element-only content are to be stripped, "none" if no whitespace text nodes are to be stripped

setUseXsiSchemaLocation

public void setUseXsiSchemaLocation(String value)

Say whether the schema processor is to take account of xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes encountered in an instance document being validated

Parameters:

value - set to "true" if these attributes are to be recognized (default) or "false" otherwise

getUseXsiSchemaLocation

public String getUseXsiSchemaLocation()

Ask whether the schema processor is to take account of xsi:schemaLocation and xsi:noNamespaceSchemaLocation attributes encountered in an instance document being validated

Returns:

"true" if these attributes are to be recognized (default) or "false" otherwise

setXmlVersion

public void setXmlVersion(String value)

Say whether XML 1.0 or XML 1.1 rules for XML names are to be followed

Parameters:

value - "1.0" (default) if XML 1.0 rules are to be used, "1.1" if XML 1.1 rules apply

getXmlVersion

public String getXmlVersion()

Ask whether XML 1.0 or XML 1.1 rules for XML names are to be followed

Returns:

"1.0" if XML 1.0 rules are to be used, "1.1" if XML 1.1 rules apply

setXsdVersion

public void setXsdVersion(String value)

Say whether XML Schema 1.0 syntax must be used or whether XML Schema 1.1 features are allowed

Parameters:

value - "1.0" (default) if XML Schema 1.0 rules are to be followed, "1.1" if XML Schema 1.1 features may be used

getXsdVersion

public String getXsdVersion()

Ask whether XML Schema 1.0 syntax must be used or whether XML Schema 1.1 features are allowed

Returns:

"1.0" (default) if XML Schema 1.0 rules are to be followed, "1.1" if XML Schema 1.1 features may be used

registerExtensionFunction

public void registerExtensionFunction(ExtensionFunctionDefinition function)

Register an extension function that is to be made available within any query. This method allows deep integration of an extension function implemented as an instance of ExtensionFunctionDefinition, using an arbitrary name and namespace. This supplements the ability to call arbitrary Java methods using a namespace and local name that are related to the Java class and method name.

This method is a Saxon extension to the XQJ interface

Parameters:

function - the class that implements the extension function. This must be a class that extends ExtensionFunctionCall, and it must have a public zero-argument constructor

Throws:

IllegalArgumentException - if the class cannot be instantiated or does not extend ExtensionFunctionCall

Since:

9.2