org.apache.xalan.lib

## Class Redirect

- java.lang.Object
- - org.apache.xalan.lib.Redirect

-     public class Redirect
      extends java.lang.Object

  Implements three extension elements to allow an XSLT transformation to redirect its output to multiple output files. It is accessed by specifying a namespace URI as follows:

          xmlns:redirect="http://xml.apache.org/xalan/redirect"

  You can either just use redirect:write, in which case the file will be opened and immediately closed after the write, or you can bracket the write calls by redirect:open and redirect:close, in which case the file will be kept open for multiple writes until the close call is encountered. Calls can be nested.

  Calls can take a 'file' attribute and/or a 'select' attribute in order to get the filename. If a select attribute is encountered, it will evaluate that expression for a string that indicates the filename. If the string evaluates to empty, it will attempt to use the 'file' attribute as a default. Filenames can be relative or absolute. If they are relative, the base directory will be the same as the base directory for the output document. This is obtained by calling getOutputTarget() on the TransformerImpl. You can set this base directory by calling TransformerImpl.setOutputTarget() or it is automatically set when using the two argument form of transform() or transformNode().

  Calls to redirect:write and redirect:open also take an optional attribute append="true|yes", which will attempt to simply append to an existing file instead of always opening a new file. The default behavior of always overwriting the file still happens if you do not specify append.

  Note: this may give unexpected results when using xml or html output methods, since this is not coordinated with the serializers - hence, you may get extra xml decls in the middle of your file after appending to it.

  Example:

       <?xml version="1.0"?>
       <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                       version="1.0"
                       xmlns:redirect="http://xml.apache.org/xalan/redirect"
                       extension-element-prefixes="redirect">

         <xsl:template match="/">
           <out>
             default output.
           </out>
           <redirect:open file="doc3.out"/>
           <redirect:write file="doc3.out">
             <out>
               <redirect:write file="doc1.out">
                 <out>
                   doc1 output.
                   <redirect:write file="doc3.out">
                     Some text to doc3
                   </redirect:write>
                 </out>
               </redirect:write>
               <redirect:write file="doc2.out">
                 <out>
                   doc2 output.
                   <redirect:write file="doc3.out">
                     Some more text to doc3
                     <redirect:write select="doc/foo">
                       text for doc4
                     </redirect:write>
                   </redirect:write>
                 </out>
               </redirect:write>
             </out>
           </redirect:write>
           <redirect:close file="doc3.out"/>
         </xsl:template>

       </xsl:stylesheet>

  Version:
    1.0
  Author:
    Scott Boag
  See Also:
    Example with Redirect extension

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static boolean` | `DEFAULT_APPEND_OPEN` Default append mode for bare open calls.
    `static boolean` | `DEFAULT_APPEND_WRITE` Default append mode for bare write calls.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `Redirect()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `close(XSLProcessorContext context, ElemExtensionCall elem)` Close the given file and remove it from the formatter listener's table.
    `SerializationHandler` | `createSerializationHandler(TransformerImpl transformer, java.io.FileOutputStream ostream, java.io.File file, OutputProperties format)` A class that extends this one could over-ride this public method and receive a callback for the creation of the serializer used in the redirection.
    `void` | `endRedirection(TransformerImpl transf)` A class that extends this class can over-ride this public method and receive a callback that redirection to the ContentHandler specified in the startRedirection() call has ended
    `void` | `open(XSLProcessorContext context, ElemExtensionCall elem)` Open the given file and put it in the XML, HTML, or Text formatter listener's table.
    `void` | `startRedirection(TransformerImpl transf, ContentHandler formatter)` A class that extends this class can over-ride this public method and recieve a callback that redirection is about to start
    `void` | `write(XSLProcessorContext context, ElemExtensionCall elem)` Write the evalutation of the element children to the given file.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### DEFAULT_APPEND_OPEN

          public static final boolean DEFAULT_APPEND_OPEN

      Default append mode for bare open calls. False for backwards compatibility (I think).
      See Also:
        Constant Field Values

    - #### DEFAULT_APPEND_WRITE

          public static final boolean DEFAULT_APPEND_WRITE

      Default append mode for bare write calls. False for backwards compatibility.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### Redirect

          public Redirect()

  - ### Method Detail

    - #### open

          public void open(XSLProcessorContext context,
                  ElemExtensionCall elem)
                    throws java.net.MalformedURLException,
                           java.io.FileNotFoundException,
                           java.io.IOException,
                           TransformerException

      Open the given file and put it in the XML, HTML, or Text formatter listener's table.
      Throws:
        `java.net.MalformedURLException`
        `java.io.FileNotFoundException`
        `java.io.IOException`
        `TransformerException`

    - #### write

          public void write(XSLProcessorContext context,
                   ElemExtensionCall elem)
                     throws java.net.MalformedURLException,
                            java.io.FileNotFoundException,
                            java.io.IOException,
                            TransformerException

      Write the evalutation of the element children to the given file. Then close the file unless it was opened with the open extension element and is in the formatter listener's table.
      Throws:
        `java.net.MalformedURLException`
        `java.io.FileNotFoundException`
        `java.io.IOException`
        `TransformerException`

    - #### close

          public void close(XSLProcessorContext context,
                   ElemExtensionCall elem)
                     throws java.net.MalformedURLException,
                            java.io.FileNotFoundException,
                            java.io.IOException,
                            TransformerException

      Close the given file and remove it from the formatter listener's table.
      Throws:
        `java.net.MalformedURLException`
        `java.io.FileNotFoundException`
        `java.io.IOException`
        `TransformerException`

    - #### startRedirection

          public void startRedirection(TransformerImpl transf,
                              ContentHandler formatter)

      A class that extends this class can over-ride this public method and recieve a callback that redirection is about to start
      Parameters:
        `transf` - The transformer.
        `formatter` - The handler that receives the redirected output

    - #### endRedirection

          public void endRedirection(TransformerImpl transf)

      A class that extends this class can over-ride this public method and receive a callback that redirection to the ContentHandler specified in the startRedirection() call has ended
      Parameters:
        `transf` - The transformer.

    - #### createSerializationHandler

          public SerializationHandler createSerializationHandler(TransformerImpl transformer,
                                                        java.io.FileOutputStream ostream,
                                                        java.io.File file,
                                                        OutputProperties format)
                                                          throws java.io.IOException,
                                                                 TransformerException

      A class that extends this one could over-ride this public method and receive a callback for the creation of the serializer used in the redirection.
      Parameters:
        `transformer` - The transformer
        `ostream` - The output stream that the serializer wraps
        `file` - The file associated with the ostream
        `format` - The format parameter used to create the serializer
      Returns:
        the serializer that the redirection will go to.
      Throws:
        `java.io.IOException`
        `TransformerException`

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