9.4. Configuring a DDL File Sequencer

Include the relevant libraries

Choose one of the following for sequencing configuration

• Define sequencing configuration based on standard example provided in SOA-ROOT/eds/modeshape/resources/modeshape-config-standard.xml:

  <mode:sequencer jcr:name="DDL File Sequencer" mode:classname="org.modeshape.sequencer.ddl.DdlSequencer">
    <mode:description>
      Sequences DDL files loaded under '/files', extracting the structured abstract syntax tree of the DDL commands and expressions.
    </mode:description>
    <mode:pathExpression>
      eds-store:default:/files(//(*.ddl[*]))/jcr:content[@jcr:data] => eds-store:default:/sequenced/ddl/$1
    </mode:pathExpression>
  </mode:sequencer>
  

• Configure via org.modeshape.jcr.JcrConfiguration:

  JcrConfiguration config = ...
  
  config.sequencer("DDL File Sequencer")
        .usingClass("org.modeshape.sequencer.ddl.DdlSequencer")
        .loadedFromClasspath()
        .setDescription("Sequences DDL files loaded under '/files', extracting the structured abstract syntax tree of the DDL commands and expressions.")
        .sequencingFrom("/files(//(*.ddl[*]))/jcr:content[@jcr:data]")
        .andOutputtingTo("/sequenced/ddl/$1");

  This will use all of the built-in grammars (e.g., "standard", "oracle", "postgres", and "derby"). To specify a different order or subset of the grammars, use the setProperty(...) method. The following example uses the standard grammar followed by the PostgreSQL grammar:

  config.sequencer("DDL File Sequencer")
        .usingClass("org.modeshape.sequencer.ddl.DdlSequencer")
        .loadedFromClasspath()
        .setDescription("Sequences DDL files loaded under '/files', extracting the structured abstract syntax tree of the DDL commands and expressions.")
        .setProperty("grammar","standard","postgres")
        .sequencingFrom("/files(//(*.ddl[*]))/jcr:content[@jcr:data]")
        .andOutputtingTo("/sequenced/ddl/$1");

  To use a custom implementation of DdlParser , use the fully-qualified name of the implementation class (which must have a no-arg constructor) as the name of the grammar:

  config.sequencer("DDL File Sequencer")
        .usingClass("org.modeshape.sequencer.ddl.DdlSequencer")
        .loadedFromClasspath()
        .setDescription("Sequences DDL files loaded under '/files', extracting the structured abstract syntax tree of the DDL commands and expressions.")
        .setProperty("grammar","standard","postgres","org.example.ddl.MyCustomDdlParser")
        .sequencingFrom("/files(//(*.ddl[*]))/jcr:content[@jcr:data]")
        .andOutputtingTo("/sequenced/ddl/$1");