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## javax.xml.transform
Class TransformerFactory

    java.lang.Object
      javax.xml.transform.TransformerFactory

Direct Known Subclasses:
  SAXTransformerFactory

public abstract class TransformerFactory
extends java.lang.Object

A TransformerFactory instance can be used to create `Transformer` and `Templates` objects.

The system property that determines which Factory implementation to create is named `"javax.xml.transform.TransformerFactory"`. This property names a concrete subclass of the `TransformerFactory` abstract class. If the property is not defined, a platform default is be used.

An implementation of the `TransformerFactory` class is NOT guaranteed to be thread safe. It is up to the user application to make sure about the use of the `TransformerFactory` from more than one thread. Alternatively the application can have one instance of the `TransformerFactory` per thread. An application can use the same instance of the factory to obtain one or more instances of a `Transformer` or `Templates` provided the instance of the factory isn't being used in more than one thread at a time.

Method Summary
`abstract Source` | `getAssociatedStylesheet(Source source, java.lang.String media, java.lang.String title, java.lang.String charset)` Get the stylesheet specification(s) associated via the xml-stylesheet processing instruction (see http://www.w3.org/TR/xml-stylesheet/) with the document document specified in the source parameter, and that match the given criteria.
`abstract java.lang.Object` | `getAttribute(java.lang.String name)` Allows the user to retrieve specific attributes on the underlying implementation.
`abstract ErrorListener` | `getErrorListener()` Get the error event handler for the TransformerFactory.
`abstract boolean` | `getFeature(java.lang.String name)` Look up the value of a feature.
`abstract URIResolver` | `getURIResolver()` Get the object that is used by default during the transformation to resolve URIs used in document(), xsl:import, or xsl:include.
`static TransformerFactory` | `newInstance()` Obtain a new instance of a `TransformerFactory`.
`abstract Templates` | `newTemplates(Source source)` Process the Source into a Templates object, which is a a compiled representation of the source.
`abstract Transformer` | `newTransformer()` Create a new Transformer object that performs a copy of the source to the result.
`abstract Transformer` | `newTransformer(Source source)` Process the Source into a Transformer object.
`abstract void` | `setAttribute(java.lang.String name, java.lang.Object value)` Allows the user to set specific attributes on the underlying implementation.
`abstract void` | `setErrorListener(ErrorListener listener)` Set the error event listener for the TransformerFactory, which is used for the processing of transformation instructions, and not for the transformation itself.
`abstract void` | `setURIResolver(URIResolver resolver)` Set an object that is used by default during the transformation to resolve URIs used in xsl:import, or xsl:include.

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

Method Detail

### newInstance

    public static TransformerFactory newInstance()
                                          throws TransformerFactoryConfigurationError

  Obtain a new instance of a `TransformerFactory`. This static method creates a new factory instance This method uses the following ordered lookup procedure to determine the `TransformerFactory` implementation class to load:
  - Use the `javax.xml.transform.TransformerFactory` 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.
  - 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.transform.TransformerFactory` in jars available to the runtime.
  - Platform default `TransformerFactory` instance.
  Once an application has obtained a reference to a `TransformerFactory` it can use the factory to configure and obtain parser instances.

  Returns:
    new TransformerFactory instance, never null (unless an `ErrorListener` is registered with the TransformerFactory, in which case an exception error sends an error message to the ErrorListener and returns null).
  Throws:
    `TransformerFactoryConfigurationError` - if the implmentation is not available or cannot be instantiated.

### newTransformer

    public abstract Transformer newTransformer(Source source)
                                        throws TransformerConfigurationException

  Process the Source into a Transformer object. Care must be given not to use this object in multiple threads running concurrently. Different TransformerFactories can be used concurrently by different threads.

  Parameters:
    `source` - An object that holds a URI, input stream, etc.
  Returns:
    A Transformer object that may be used to perform a transformation in a single thread, never null (unless an `ErrorListener` is registered with the TransformerFactory, in which case an exception error sends an error message to the ErrorListener and returns null).
  Throws:
    `TransformerConfigurationException` - May throw this during the parse when it is constructing the Templates object and fails.

### newTransformer

    public abstract Transformer newTransformer()
                                        throws TransformerConfigurationException

  Create a new Transformer object that performs a copy of the source to the result.

  Returns:
    A Transformer object that may be used to perform a transformation in a single thread, never null (unless an `ErrorListener` is registered with the TransformerFactory, in which case an exception error sends an error message to the ErrorListener and returns null).
  Throws:
    `TransformerConfigurationException` - May throw this during the parse when it is constructing the Templates object and fails.

### newTemplates

    public abstract Templates newTemplates(Source source)
                                    throws TransformerConfigurationException

  Process the Source into a Templates object, which is a a compiled representation of the source. This Templates object may then be used concurrently across multiple threads. Creating a Templates object allows the TransformerFactory to do detailed performance optimization of transformation instructions, without penalizing runtime transformation.

  Parameters:
    `source` - An object that holds a URL, input stream, etc.
  Returns:
    A Templates object capable of being used for transformation purposes, never null (unless an `ErrorListener` is registered with the TransformerFactory, in which case an exception error sends an error message to the ErrorListener and returns null).
  Throws:
    `TransformerConfigurationException` - May throw this during the parse when it is constructing the Templates object and fails.

### getAssociatedStylesheet

    public abstract Source getAssociatedStylesheet(Source source,
                                                   java.lang.String media,
                                                   java.lang.String title,
                                                   java.lang.String charset)
                                            throws TransformerConfigurationException

  Get the stylesheet specification(s) associated via the xml-stylesheet processing instruction (see http://www.w3.org/TR/xml-stylesheet/) with the document document specified in the source parameter, and that match the given criteria. Note that it is possible to return several stylesheets, in which case they are applied as if they were a list of imports or cascades in a single stylesheet.

  Parameters:
    `source` - The XML source document.
    `media` - The media attribute to be matched. May be null, in which case the prefered templates will be used (i.e. alternate = no).
    `title` - The value of the title attribute to match. May be null.
    `charset` - The value of the charset attribute to match. May be null.
  Returns:
    A Source object suitable for passing to the TransformerFactory.
  Throws:
    `TransformerConfigurationException.`
    `TransformerConfigurationException`

### setURIResolver

    public abstract void setURIResolver(URIResolver resolver)

  Set an object that is used by default during the transformation to resolve URIs used in xsl:import, or xsl:include.

  Parameters:
    `resolver` - An object that implements the URIResolver interface, or null.

### getURIResolver

    public abstract URIResolver getURIResolver()

  Get the object that is used by default during the transformation to resolve URIs used in document(), xsl:import, or xsl:include.

  Returns:
    The URIResolver that was set with setURIResolver.

### getFeature

    public abstract boolean getFeature(java.lang.String name)

  Look up the value of a feature.

  The feature name is any absolute URI.

  Parameters:
    `name` - The feature name, which is an absolute URI.
  Returns:
    The current state of the feature (true or false).

### setAttribute

    public abstract void setAttribute(java.lang.String name,
                                      java.lang.Object value)
                               throws java.lang.IllegalArgumentException

  Allows the user to set specific attributes on the underlying implementation. An attribute in this context is defined to be an option that the implementation provides.

  Parameters:
    `name` - The name of the attribute.
    `value` - The value of the attribute.
  Throws:
    `java.lang.IllegalArgumentException` - thrown if the underlying implementation doesn't recognize the attribute.

### getAttribute

    public abstract java.lang.Object getAttribute(java.lang.String name)
                                           throws java.lang.IllegalArgumentException

  Allows the user to retrieve specific attributes on the underlying implementation.

  Parameters:
    `name` - The name of the attribute.
  Returns:
    value The value of the attribute.
  Throws:
    `java.lang.IllegalArgumentException` - thrown if the underlying implementation doesn't recognize the attribute.

### setErrorListener

    public abstract void setErrorListener(ErrorListener listener)
                                   throws java.lang.IllegalArgumentException

  Set the error event listener for the TransformerFactory, which is used for the processing of transformation instructions, and not for the transformation itself.

  Parameters:
    `listener` - The new error listener.
  Throws:
    `java.lang.IllegalArgumentException` - if listener is null.

### getErrorListener

    public abstract ErrorListener getErrorListener()

  Get the error event handler for the TransformerFactory.

  Returns:
    The current error handler, which should never be null.

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Copyright © 2004 Apache XML Project. All Rights Reserved.