cdmlib-model/src/main/java/eu/etaxonomy/cdm/jaxb/CdmSchemaGenerator.java

   1 /**
   2  *  This class is responsible for generating a set of XML schemas for the CDM.
   3  *  It generates one XML schema per namespace from the JAXB annotations of the
   4  *  model classes. This class might be used in future to generate the
   5  *  initial version of the CDM schemas. Once the initially generated schemas
   6  *  have been manually customized, CdmSchemaGenerator could be used to compare
   7  *  the customized XML schemas against the generated ones.
   8  */
   9 package eu.etaxonomy.cdm.jaxb;
  10
  11 import java.io.File;
  12 import java.io.IOException;
  13 import java.io.StringReader;
  14 import java.io.StringWriter;
  15 import java.io.Writer;
  16
  17 import javax.xml.bind.JAXBContext;
  18 import javax.xml.bind.JAXBException;
  19 import javax.xml.bind.SchemaOutputResolver;
  20 import javax.xml.transform.Result;
  21 import javax.xml.transform.stream.StreamSource;
  22 import javax.xml.transform.stream.StreamResult;
  23 import javax.xml.validation.Schema;
  24 import javax.xml.validation.SchemaFactory;
  25
  26 import org.xml.sax.SAXException;
  27
  28 import eu.etaxonomy.cdm.model.DataSet;
  29
  30 /**
  31  * @author a.babadshanjan
  32  *
  33  */
  34 public class CdmSchemaGenerator extends SchemaOutputResolver {
  35
  36         private JAXBContext jaxbContext;
  37         private StringWriter out = new StringWriter();
  38
  39         public CdmSchemaGenerator() throws SAXException, JAXBException, IOException {
  40
  41                 jaxbContext = JAXBContext.newInstance(new Class[] {DataSet.class});
  42         }
  43
  44         /**
  45      * Buffers one schema file per namespace.
  46      * Result here is schema1.xsd, ..., schema7.xsd in C:\Temp.
  47      * filename param is ignored.
  48          * @see javax.xml.bind.SchemaOutputResolver#createOutput(java.lang.String, java.lang.String)
  49          */
  50         @Override
  51         public Result createOutput(String namespaceUri, String filename) throws IOException {
  52
  53                 String userHome = System.getProperty("user.home");
  54                 StreamResult res = new StreamResult(new File("C:" + File.separator + "Temp", filename));
  55                 //StreamResult res = new StreamResult(new File(filename));
  56                 return res;
  57         }
  58
  59         /**
  60      * Writes one schema file per namespace.
  61          * @see javax.xml.bind.SchemaOutputResolver#createOutput(java.lang.String, java.lang.String)
  62          */
  63         public void writeSchema() throws JAXBException, IOException, SAXException {
  64
  65                 jaxbContext.generateSchema(this);
  66         }
  67
  68         /**
  69          * Not used
  70          *
  71      * Buffers one single generated schema.
  72          * @see javax.xml.bind.SchemaOutputResolver#createOutput(java.lang.String, java.lang.String)
  73          */
  74         public Schema createSchema() throws SAXException {
  75
  76                 Schema schema =
  77                 SchemaFactory.newInstance("http://www.w3.org/2001/XMLSchema").newSchema(
  78                                 new StreamSource( new StringReader(out.toString())));
  79                 return schema;
  80
  81         }
  82
  83         // set implicit schema for validation
  84         // Schema implicitSchema = cdmSchemaGenerator.createSchema();
  85
  86 }