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## javax.xml.transform
Class Transformer

    java.lang.Object
      javax.xml.transform.Transformer

public abstract class Transformer
extends Object

An instance of this abstract class can transform a source tree into a result tree.

An instance of this class can be obtained with the `TransformerFactory.newTransformer` method. This instance may then be used to process XML from a variety of sources and write the transformation output to a variety of sinks.

An object of this class may not be used in multiple threads running concurrently. Different Transformers may be used concurrently by different threads.

A `Transformer` may be used multiple times. Parameters and output properties are preserved across transformations.

Constructor Summary
`protected` | `Transformer()` Default constructor is protected on purpose.

Method Summary
`abstract void` | `clearParameters()` Clear all parameters set with setParameter.
`abstract ErrorListener` | `getErrorListener()` Get the error event handler in effect for the transformation.
`abstract Properties` | `getOutputProperties()` Get a copy of the output properties for the transformation.
`abstract String` | `getOutputProperty(String name)` Get an output property that is in effect for the transformation.
`abstract Object` | `getParameter(String name)` Get a parameter that was explicitly set with setParameter or setParameters.
`abstract URIResolver` | `getURIResolver()` Get an object that will be used to resolve URIs used in document(), etc.
`abstract void` | `setErrorListener(ErrorListener listener)` Set the error event listener in effect for the transformation.
`abstract void` | `setOutputProperties(Properties oformat)` Set the output properties for the transformation.
`abstract void` | `setOutputProperty(String name, String value)` Set an output property that will be in effect for the transformation.
`abstract void` | `setParameter(String name, Object value)` Add a parameter for the transformation.
`abstract void` | `setURIResolver(URIResolver resolver)` Set an object that will be used to resolve URIs used in document().
`abstract void` | `transform(Source xmlSource, Result outputTarget)` Process the source tree to the output result.

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

Constructor Detail

### Transformer

    protected Transformer()

  Default constructor is protected on purpose.

Method Detail

### transform

    public abstract void transform(Source xmlSource,
                                   Result outputTarget)
                            throws TransformerException

  Process the source tree to the output result.

  Parameters:
    `xmlSource` - The input for the source tree.
    `outputTarget` - The output target.
  Throws:
    `TransformerException` - If an unrecoverable error occurs during the course of the transformation.

### setParameter

    public abstract void setParameter(String name,
                                      Object value)

  Add a parameter for the transformation.

  Pass a qualified name as a two-part string, the namespace URI enclosed in curly braces ({}), followed by the local name. If the name has a null URL, the String only contain the local name. An application can safely check for a non-null URI by testing to see if the first character of the name is a '{' character.

  For example, if a URI and local name were obtained from an element defined with <xyz:foo xmlns:xyz="http://xyz.foo.com/yada/baz.html"/>, then the qualified name would be "{http://xyz.foo.com/yada/baz.html}foo". Note that no prefix is used.

  Parameters:
    `name` - The name of the parameter, which may begin with a namespace URI in curly braces ({}).
    `value` - The value object. This can be any valid Java object. It is up to the processor to provide the proper object coersion or to simply pass the object on for use in an extension.

### getParameter

    public abstract Object getParameter(String name)

  Get a parameter that was explicitly set with setParameter or setParameters.

  This method does not return a default parameter value, which cannot be determined until the node context is evaluated during the transformation process.

  Returns:
    A parameter that has been set with setParameter.

### clearParameters

    public abstract void clearParameters()

  Clear all parameters set with setParameter.

### setURIResolver

    public abstract void setURIResolver(URIResolver resolver)

  Set an object that will be used to resolve URIs used in document().

  If the resolver argument is null, the URIResolver value will be cleared, and the default behavior will be used.

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

### getURIResolver

    public abstract URIResolver getURIResolver()

  Get an object that will be used to resolve URIs used in document(), etc.

  Returns:
    An object that implements the URIResolver interface, or null.

### setOutputProperties

    public abstract void setOutputProperties(Properties oformat)
                                      throws IllegalArgumentException

  Set the output properties for the transformation. These properties will override properties set in the Templates with xsl:output.

  If argument to this function is null, any properties previously set are removed, and the value will revert to the value defined in the templates object.

  Pass a qualified property key name as a two-part string, the namespace URI enclosed in curly braces ({}), followed by the local name. If the name has a null URL, the String only contain the local name. An application can safely check for a non-null URI by testing to see if the first character of the name is a '{' character.

  For example, if a URI and local name were obtained from an element defined with <xyz:foo xmlns:xyz="http://xyz.foo.com/yada/baz.html"/>, then the qualified name would be "{http://xyz.foo.com/yada/baz.html}foo". Note that no prefix is used.

  Parameters:
    `oformat` - A set of output properties that will be used to override any of the same properties in affect for the transformation.
  Throws:
    `IllegalArgumentException` - if any of the argument keys are not recognized and are not namespace qualified.
  See Also:
    `OutputKeys`, `Properties`

### getOutputProperties

    public abstract Properties getOutputProperties()

  Get a copy of the output properties for the transformation.

  The properties returned should contain properties set by the user, and properties set by the stylesheet, and these properties are "defaulted" by default properties specified by section 16 of the XSL Transformations (XSLT) W3C Recommendation. The properties that were specifically set by the user or the stylesheet should be in the base Properties list, while the XSLT default properties that were not specifically set should be the default Properties list. Thus, getOutputProperties().getProperty(String key) will obtain any property in that was set by `setOutputProperty(java.lang.String, java.lang.String)`, `setOutputProperties(java.util.Properties)`, in the stylesheet, or the default properties, while getOutputProperties().get(String key) will only retrieve properties that were explicitly set by `setOutputProperty(java.lang.String, java.lang.String)`, `setOutputProperties(java.util.Properties)`, or in the stylesheet.

  Note that mutation of the Properties object returned will not effect the properties that the transformation contains.

  If any of the argument keys are not recognized and are not namespace qualified, the property will be ignored. In other words the behaviour is not orthogonal with setOutputProperties.

  See Also:
    `OutputKeys`, `Properties`

### setOutputProperty

    public abstract void setOutputProperty(String name,
                                           String value)
                                    throws IllegalArgumentException

  Set an output property that will be in effect for the transformation.

  Pass a qualified property name as a two-part string, the namespace URI enclosed in curly braces ({}), followed by the local name. If the name has a null URL, the String only contain the local name. An application can safely check for a non-null URI by testing to see if the first character of the name is a '{' character.

  For example, if a URI and local name were obtained from an element defined with <xyz:foo xmlns:xyz="http://xyz.foo.com/yada/baz.html"/>, then the qualified name would be "{http://xyz.foo.com/yada/baz.html}foo". Note that no prefix is used.

  The Properties object that was passed to `setOutputProperties(java.util.Properties)` won't be effected by calling this method.

  Parameters:
    `name` - A non-null String that specifies an output property name, which may be namespace qualified.
    `value` - The non-null string value of the output property.
  Throws:
    `IllegalArgumentException` - If the property is not supported, and is not qualified with a namespace.
  See Also:
    `OutputKeys`

### getOutputProperty

    public abstract String getOutputProperty(String name)
                                      throws IllegalArgumentException

  Get an output property that is in effect for the transformation. The property specified may be a property that was set with setOutputProperty, or it may be a property specified in the stylesheet.

  Parameters:
    `name` - A non-null String that specifies an output property name, which may be namespace qualified.
  Returns:
    The string value of the output property, or null if no property was found.
  Throws:
    `IllegalArgumentException` - If the property is not supported.
  See Also:
    `OutputKeys`

### setErrorListener

    public abstract void setErrorListener(ErrorListener listener)
                                   throws IllegalArgumentException

  Set the error event listener in effect for the transformation.

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

### getErrorListener

    public abstract ErrorListener getErrorListener()

  Get the error event handler in effect for the transformation.

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

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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