XML Standard API: Class SAXParserFactory

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## javax.xml.parsers
Class SAXParserFactory

    java.lang.Object
      |
      +--javax.xml.parsers.SAXParserFactory

public abstract class SAXParserFactory
extends java.lang.Object

Defines a factory API that enables applications to configure and obtain a SAX based parser to parse XML documents.

Version:
  $Revision: 446598 $, $Date: 2006-09-15 08:55:40 -0400 (Fri, 15 Sep 2006) $
Author:
  Jeff Suttor

Constructor Summary
`protected` | `SAXParserFactory()` Protected constructor to force use of `newInstance()`.

Method Summary
`abstract boolean` | `getFeature(java.lang.String name)` Returns the particular property requested for in the underlying implementation of org.xml.sax.XMLReader.
`Schema` | `getSchema()` Gets the `Schema` object specified through the `setSchema(Schema schema)` method.
`boolean` | `isNamespaceAware()` Indicates whether or not the factory is configured to produce parsers which are namespace aware.
`boolean` | `isValidating()` Indicates whether or not the factory is configured to produce parsers which validate the XML content during parse.
`boolean` | `isXIncludeAware()` Get state of XInclude processing.
`static SAXParserFactory` | `newInstance()` Obtain a new instance of a `SAXParserFactory`.
`abstract SAXParser` | `newSAXParser()` Creates a new instance of a SAXParser using the currently configured factory parameters.
`abstract void` | `setFeature(java.lang.String name, boolean value)` Sets the particular feature in the underlying implementation of org.xml.sax.XMLReader.
`void` | `setNamespaceAware(boolean awareness)` Specifies that the parser produced by this code will provide support for XML namespaces.
`void` | `setSchema(Schema schema)` Set the `Schema` to be used by parsers created from this factory.
`void` | `setValidating(boolean validating)` Specifies that the parser produced by this code will validate documents as they are parsed.
`void` | `setXIncludeAware(boolean state)` Set state of XInclude processing.

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

Constructor Detail

### SAXParserFactory

    protected SAXParserFactory()

  Protected constructor to force use of `newInstance()`.

Method Detail

### newInstance

    public static SAXParserFactory newInstance()

  Obtain a new instance of a `SAXParserFactory`. This static method creates a new factory instance This method uses the following ordered lookup procedure to determine the `SAXParserFactory` implementation class to load:
  - Use the `javax.xml.parsers.SAXParserFactory` system property.
  - Use the properties file "lib/jaxp.properties" in the JRE directory. This configuration file is in standard `java.util.Properties` format and contains the fully qualified name of the implementation class with the key being the system property defined above. The jaxp.properties file is read only once by the JAXP implementation and it's values are then cached for future use. If the file does not exist when the first attempt is made to read from it, no further attempts are made to check for its existence. It is not possible to change the value of any property in jaxp.properties after it has been read for the first time.
  - Use the Services API (as detailed in the JAR specification), if available, to determine the classname. The Services API will look for a classname in the file `META-INF/services/javax.xml.parsers.SAXParserFactory` in jars available to the runtime.
  - Platform default `SAXParserFactory` instance.
  Once an application has obtained a reference to a `SAXParserFactory` it can use the factory to configure and obtain parser instances.

  ## Tip for Trouble-shooting

  Setting the `jaxp.debug` system property will cause this method to print a lot of debug messages to `System.err` about what it is doing and where it is looking at.

  If you have problems loading `DocumentBuilder`s, try:

       java -Djaxp.debug=1 YourProgram ....

  Returns:
    A new instance of a SAXParserFactory.
  Throws:
    `FactoryConfigurationError` - if the implementation is not available or cannot be instantiated.

### newSAXParser

    public abstract SAXParser newSAXParser()
                                    throws ParserConfigurationException,
                                           SAXException

  Creates a new instance of a SAXParser using the currently configured factory parameters.

  Returns:
    A new instance of a SAXParser.
  Throws:
    `ParserConfigurationException` - if a parser cannot be created which satisfies the requested configuration.
    `SAXException` - for SAX errors.

### setNamespaceAware

    public void setNamespaceAware(boolean awareness)

  Specifies that the parser produced by this code will provide support for XML namespaces. By default the value of this is set to `false`.
  Parameters:
    `awareness` - true if the parser produced by this code will provide support for XML namespaces; false otherwise.

### setValidating

    public void setValidating(boolean validating)

  Specifies that the parser produced by this code will validate documents as they are parsed. By default the value of this is set to `false`.

  Note that "the validation" here means a validating parser as defined in the XML recommendation. In other words, it essentially just controls the DTD validation. (except the legacy two properties defined in JAXP 1.2. See here for more details.)

  To use modern schema languages such as W3C XML Schema or RELAX NG instead of DTD, you can configure your parser to be a non-validating parser by leaving the `setValidating(boolean)` method `false`, then use the `setSchema(Schema)` method to associate a schema to a parser.

  Parameters:
    `validating` - true if the parser produced by this code will validate documents as they are parsed; false otherwise.

### isNamespaceAware

    public boolean isNamespaceAware()

  Indicates whether or not the factory is configured to produce parsers which are namespace aware.
  Returns:
    true if the factory is configured to produce parsers which are namespace aware; false otherwise.

### isValidating

    public boolean isValidating()

  Indicates whether or not the factory is configured to produce parsers which validate the XML content during parse.
  Returns:
    true if the factory is configured to produce parsers which validate the XML content during parse; false otherwise.

### setFeature

    public abstract void setFeature(java.lang.String name,
                                    boolean value)
                             throws ParserConfigurationException,
                                    SAXNotRecognizedException,
                                    SAXNotSupportedException

  Sets the particular feature in the underlying implementation of org.xml.sax.XMLReader. A list of the core features and properties can be found at http://www.saxproject.org/

  All implementations are required to support the `XMLConstants.FEATURE_SECURE_PROCESSING` feature. When the feature is

  - `true`: the implementation will limit XML processing to conform to implementation limits. Examples include enity expansion limits and XML Schema constructs that would consume large amounts of resources. If XML processing is limited for security reasons, it will be reported via a call to the registered `ErrorHandler.fatalError(SAXParseException exception)`. See `SAXParser` `parse` methods for handler specification.
  - When the feature is `false`, the implementation will processing XML according to the XML specifications without regard to possible implementation limits.
  Parameters:
    `name` - The name of the feature to be set.
    `value` - The value of the feature to be set.
  Throws:
    `ParserConfigurationException` - if a parser cannot be created which satisfies the requested configuration.
    `SAXNotRecognizedException` - When the underlying XMLReader does not recognize the property name.
    `SAXNotSupportedException` - When the underlying XMLReader recognizes the property name but doesn't support the property.
    `java.lang.NullPointerException` - If the `name` parameter is null.
  See Also:
    `XMLReader.setFeature(java.lang.String, boolean)`

### getFeature

    public abstract boolean getFeature(java.lang.String name)
                                throws ParserConfigurationException,
                                       SAXNotRecognizedException,
                                       SAXNotSupportedException

  Returns the particular property requested for in the underlying implementation of org.xml.sax.XMLReader.

  Parameters:
    `name` - The name of the property to be retrieved.
  Returns:
    Value of the requested property.
  Throws:
    `ParserConfigurationException` - if a parser cannot be created which satisfies the requested configuration.
    `SAXNotRecognizedException` - When the underlying XMLReader does not recognize the property name.
    `SAXNotSupportedException` - When the underlying XMLReader recognizes the property name but doesn't support the property.
  See Also:
    `XMLReader.getProperty(java.lang.String)`

### getSchema

    public Schema getSchema()

  Gets the `Schema` object specified through the `setSchema(Schema schema)` method.
  Returns:
    the `Schema` object that was last set through the `setSchema(Schema)` method, or null if the method was not invoked since a `SAXParserFactory` is created.
  Throws:
    `UnsupportedOperationException` - For backward compatibility, when implementations for earlier versions of JAXP is used, this exception will be thrown.
  Since:
    1.5

### setSchema

    public void setSchema(Schema schema)

  Set the `Schema` to be used by parsers created from this factory.

  When a `Schema` is non-null, a parser will use a validator created from it to validate documents before it passes information down to the application.

  When warnings/errors/fatal errors are found by the validator, the parser must handle them as if those errors were found by the parser itself. In other words, if the user-specified `ErrorHandler` is set, it must receive those errors, and if not, they must be treated according to the implementation specific default error handling rules.

  A validator may modify the SAX event stream (for example by adding default values that were missing in documents), and a parser is responsible to make sure that the application will receive those modified event stream.

  Initialy, `null` is set as the `Schema`.

  This processing will take effect even if the `isValidating()` method returns `false`.

  It is an error to use the `http://java.sun.com/xml/jaxp/properties/schemaSource` property and/or the `http://java.sun.com/xml/jaxp/properties/schemaLanguage` property in conjunction with a non-null `Schema` object. Such configuration will cause a `SAXException` exception when those properties are set on a `SAXParser`.

  #### Note for implmentors

  A parser must be able to work with any `Schema` implementation. However, parsers and schemas are allowed to use implementation-specific custom mechanisms as long as they yield the result described in the specification.

  Parameters:
    `schema` - `Schema` to use, `null` to remove a schema.
  Throws:
    `UnsupportedOperationException` - For backward compatibility, when implementations for earlier versions of JAXP is used, this exception will be thrown.
  Since:
    1.5

### setXIncludeAware

    public void setXIncludeAware(boolean state)

  Set state of XInclude processing.

  If XInclude markup is found in the document instance, should it be processed as specified in XML Inclusions (XInclude) Version 1.0.

  XInclude processing defaults to `false`.

  Parameters:
    `state` - Set XInclude processing to `true` or `false`
  Throws:
    `UnsupportedOperationException` - For backward compatibility, when implementations for earlier versions of JAXP is used, this exception will be thrown.
  Since:
    1.5

### isXIncludeAware

    public boolean isXIncludeAware()

  Get state of XInclude processing.

  Returns:
    current state of XInclude processing
  Throws:
    `UnsupportedOperationException` - For backward compatibility, when implementations for earlier versions of JAXP is used, this exception will be thrown.
  Since:
    1.5

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