Examples of nexj.core.meta.Metaclass.invoke()

nexj.core.meta.Metaclass.invoke()
@see nexj.core.meta.Accessor#invoke(java.lang.String,java.lang.Object[])

      Metaclass animalClass = m_metadata.getMetaclass("Animal");
      Instance inst = null;
      InstanceArrayList list = null;


      // Read all
      list = (InstanceArrayList)animalClass.invoke("read", new Object[]{
         null, null, parse("((commonName . #t))"), null, null, null
      });


      assertEquals(4, list.size());
      inst = list.getInstance(0);

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      assertEquals("Spider", inst.getValue("commonName"));


      m_context.initialize(m_context.getPrincipal(), m_context.getMachine().getGlobalEnvironment());


      // Read just 4-legged animals
      list = (InstanceArrayList)animalClass.invoke("read", new Object[]{
         parse("(commonName)"), Pair.list(Symbol.EQ, Pair.attribute("limbCount"), Primitive.createInteger(4)), null, null, null, null
      });


      assertEquals(3, list.size());
      inst = list.getInstance(0);

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      assertNull(cur.next());


      // Read class that has 2-part OID
      Metaclass penClass = m_metadata.getMetaclass("AnimalPen");


      list = (InstanceArrayList)penClass.invoke("read", new Object[] {
         null, Pair.list(Symbol.EQ, Pair.attribute("name"), "Dog pen"), null, null, null, null
      });


      assertEquals(1, list.size());
      inst = list.getInstance(0);

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      assertEquals("Kerberos", inst.getValue("petName"));


      // Read sub-class directly.
      Metaclass domAnimalClass = m_metadata.getMetaclass("DomesticAnimal");


      list = (InstanceArrayList)domAnimalClass.invoke("read", new Object[]{
         parse("(petName commonName)"), parse("(= (@ petName) \"Cleopatra\")"), null, null, null, null
      });


      assertEquals(1, list.size());
      inst = list.getInstance(0);

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      Instance inst = null;
      InstanceArrayList list = null;
      Collection data;


      // Read dog.
      list = (InstanceArrayList)animalClass.invoke("read", new Object[]{
         parse("(scientificName)"), parse("(= (@ commonName) \"Dog\")"), null, null, null, null
      });


      assertEquals(1, list.size());
      inst = list.getInstance(0);

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      inst.setValue("scientificName", "Canis lupus familiaris");
      inst.setValue("petName", "Cerberus");  // Update sub-class attribute
      m_context.getUnitOfWork().commit();


      // Read dog again.
      list = (InstanceArrayList)animalClass.invoke("read", new Object[]{
         null, Pair.list(Symbol.EQ, Pair.attribute("commonName"), "Dog"), null, null, null, null
      });


      assertEquals(1, list.size());
      inst = list.getInstance(0);

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   {
      Metaclass animalClass = m_metadata.getMetaclass("Animal");
      Instance inst = null;
      InstanceArrayList list = null;


      list = (InstanceArrayList)animalClass.invoke("read", new Object[]{
         null, null, null, null, null, null
      });


      assertEquals(4, list.size());
      inst = list.getInstance(0);

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            nStartCallCount + 3, nEndCallCount);


         throw ex;
      }


      list = (InstanceArrayList)animalClass.invoke("read", new Object[]{
         null, null, null, null, null, null
      });


      assertEquals(4, list.size());
      inst = list.getInstance(0);

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      Metaclass penClass = m_metadata.getMetaclass("AnimalPen");
      Instance animal, pen;
      InstanceList list;


      // Create new pen & update existing animal
      pen = (Instance)penClass.invoke("new", new Object[]
      {
         new Pair(Symbol.define("name"), "Chimpanzee pen")
      });
      list = Query.createRead(animalClass,
         parse("(commonName pen)"), parse("(= (@ commonName) \"Beaver\")"),

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      data = (Collection)m_context.getMachine().eval(parse("(AnimalStore'data)"));
      assertEquals(4, data.size());


      // Create new animal
      inst = (Instance)animalClass.invoke("new", new Object[]
      {
         new Pair(Symbol.define("commonName"), "Chimpanzee"),
         new Pair(Symbol.define("scientificName"), "Pan troglodytes"),
         new Pair(Symbol.define("limbCount"), Primitive.createInteger(4))
      });

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