Examples of nexj.core.scripting.Pair

nexj.core.scripting.Pair
The Lisp Pair (cons). Also an expression node. The internal representation of the expression is the same as in Lisp, i.e. pairs with symbols for operators. This class provides convenience expression building API for use in Java code. Sample Usage Java-like syntax: (address.city like "A*") and (birthDate >= #1-Jan-1980#) Scheme syntax: (and (like? (@ address city) "A*") (>= birthDate (cast timestamp "1980-01-01 00:00:00"))) Internal representation: (and . ((like? . ((@ . (address . (city . '())) . ("A*" . '())))) . ((>= . (birthdate . ((cast . (timestamp . ("1980-01-01 00:00:00" . '())))) . '()))) Java API for Scheme expressions: Pair.attribute("city").from("address").like("A*") .and(Pair.attribute("birthDate").ge(Primitive.toTimestamp("1980-01-01 00:00:00"));

      assertEquals("p1", params[0]);
      assertEquals(Primitive.ZERO_DOUBLE, params[1]);


      assertNull(req.getInvocation(0).getAttributes());


      Pair pair = req.getInvocation(1).getAttributes();


      assertEquals("a", pair.getHead());
      assertEquals("b", pair.getNext().getHead());
      assertNull(pair.getNext().getNext());


      OID oid = contact.getOID();


      assertEquals(1, oid.getCount());
      assertEquals("123", oid.getValue(0));


      assertEquals("Contact", contact.getClassName());
      assertEquals("update", contact.getEventName());
      assertEquals(12345, contact.getVersion());
      assertEquals(24, contact.getValueCount());
      assertEquals("Java", contact.getValue("firstName"));
      assertEquals("Kava", contact.getValue("lastName"));
      assertNull(contact.getValue("null"));
      assertSame(contact, contact.getValue("self"));
      checkEquals(Primitive.ONE_INTEGER, (Number)contact.getValue("integer"));
      checkEquals(Primitive.createLong(2), (Number)contact.getValue("long"));
      checkEquals(Primitive.createFloat(0.625f), (Number)contact.getValue("float"));
      checkEquals(Primitive.createDouble(1.625), (Number)contact.getValue("double"));
      checkEquals(new BigDecimal("1.2345"), (Number)contact.getValue("decimal"));
      assertEquals(new Timestamp(12345), contact.getValue("timestamp"));
      assertEquals(Boolean.TRUE, contact.getValue("boolean"));
      assertEquals(new Binary(new byte[]{1, 2, 3, 4, 5}), contact.getValue("binary"));
      assertEquals(new Binary(new byte[]{1, 2, 3, 4, 5, 6, 7}), contact.getValue("binary2"));
      assertEquals(new Binary(new byte[]{1, 2}), contact.getValue("binary3"));
      assertEquals("sym", ((Symbol)contact.getValue("symbol")).getName());
      assertSame(Symbol.define("sym"), contact.getValue("symbol"));


      Pair pairA = (Pair)contact.getValue("pair");
      assertEquals("A", pairA.getHead());


      Pair pairB = pairA.getNext();
      assertEquals("B", pairB.getHead());
      assertNull(pairB.getTail());


      char[] cvec = (char[])contact.getValue("cvector");


      assertEquals(3, cvec.length);
      assertEquals('a', cvec[0]);

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      assertEquals("a", m_list.getInstance(1).getValue("city"));
   }


   public void testList()
   {
      Pair pair = m_list.list();
      
      assertEquals(2, Pair.length(pair));
      assertEquals("a", ((Instance)pair.getHead()).getValue("city"));
      assertEquals("b", ((Instance)pair.getNext().getHead()).getValue("city"));
   }

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    * @throws Exception If an error occurs.
    */
   protected void checkSameResults(Metaclass clazz, String sReferenceQueryAttributes, String sTestQueryAttributes, String sOrderBy)
      throws Exception
   {
      Pair orderBy = parse(sOrderBy);
      Pair attributes;
      List expectedData = new ArrayList(8);
      List actualData = new ArrayList(8);


      attributes = parse(sReferenceQueryAttributes);
      query(clazz, attributes, expectedData, orderBy);

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      assertEquals("create", ((TransferObject)res.getResult(0)).getEventName());
      assertNull(tobj.getOID()); 
      assertEquals(1, res.getEventCount());
      assertEquals(1, ((List)res.getEvent(0)).size());


      tobj.setValue("number", new Pair(new PCodeFunction()));


      try
      {
         server.invoke(req);
         fail("Expected RPCException");

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      m_unmarshaller = new TextUnmarshaller(new InvocationContext(Repository.getMetadata()));
   }


   public void testDeserializeExpression() throws IOException
   {
      Pair pair = (Pair)m_unmarshaller.deserialize(new StringReader("3vP3X(1)1#"));


      assertEquals(new Integer(1), ((Pair)pair.getHead()).getHead());
      assertNull(((Pair)pair.getHead()).getTail());
      assertSame(pair.getHead(), pair.getTail());
   }

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      assertEquals(new OID(new Object[] { null, "a", Primitive.createInteger(123), Primitive.createLong(567), Primitive.createDouble(1.234),
               new BigDecimal("456.789"), new Date(1234567), Boolean.FALSE,
               new Binary(new byte[] { (byte) 134, 45, (byte) 173 }) }), oid);


      clear();
      m_marshaller.serialize(new Pair("A", new Pair(new Pair("B",Symbol.define("C")))), m_writer);
      assertEquals("{\":head\":\"A\",\":tail\":{\":head\":{\":head\":\"B\",\":tail\":{\":symbol\":\"C\"}}}}", m_writer.toString());


      Pair p = (Pair) m_unmarshaller.deserialize(new StringReader(m_writer.toString()));
      assertEquals(new Pair("A", new Pair(new Pair("B",Symbol.define("C")))), p);
   }

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   public void testSchemeExpression() throws UnmarshallerException, IOException
   {
      m_unmarshaller = new JSONUnmarshaller(new InvocationContext(Repository.getMetadata()));


      Pair pair = (Pair) m_unmarshaller.deserialize(new StringReader("{\":expression\":\"(firstName lastName fullName \\\"loginName\\\" )\"}"));
      assertEquals(Pair.list(Symbol.define("firstName"), Symbol.define("lastName"), Symbol.define("fullName") , "loginName"), pair);
   }

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      assertEquals("Cottage", ((Instance)list.getInstance(0).getValue("f1")).getValue("caption"));
   }


   protected Object parseEval(String sScript)
   {
      Pair code = parse(sScript);


      return m_context.getMachine().eval(code);
   }

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   /**
    * @see nexj.core.persistence.Operator#getExpression(nexj.core.persistence.Query)
    */
   public Object getExpression(Query root)
   {
      Pair expression = null;


      for (int i = m_nOperandCount - 1; i >= 0; i--)
      {
         expression = new Pair(m_operandArray[i].getExpression(root),expression);
      }


      return new Pair(getSymbol(), expression);
   }

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         refPart = ((CompositeMessagePartRef)part).getRefPart();
         message = refPart.getDeclarator();


         if (!currPathSet.add(refPart))
         {
            return (m_attribute == null) ? null : new Pair(m_attribute.getSymbol());
         }
      }


      CompositeMessagePart composite = (CompositeMessagePart)part;
      Pair attributes = null;


      for (int i = composite.getPartCount() - 1; i >= 0; --i)
      {
         MessagePart childPart = composite.getPart(i);
         ObjectMessagePartMapping childMapping = (ObjectMessagePartMapping)childPart.getMapping();
         Object childAttributes = childMapping.getAttributes(childPart, currPathSet, message);


         if (childAttributes != null)
         {
            attributes = new Pair(childAttributes, attributes);
         }
      }


      // Add attributes from derived messages
      if (refPart != null)
      {
         ObjectMessagePartMapping refMapping = (ObjectMessagePartMapping)refPart.getMapping();
         Message refMessage = refMapping.getMessage();


         for (int i = 0, nCount = refMessage.getDerivedMessageCount(); i < nCount; i++)
         {
            Message derivedMessage = refMessage.getDerivedMessage(i);
            CompositeMessagePart derivedRoot = derivedMessage.getRoot();
            ObjectMessagePartMapping derivedMapping = (ObjectMessagePartMapping)derivedRoot.getMapping();
            Object derivedAttributes = derivedMapping.getAttributes(derivedRoot, currPathSet, refMessage);


            if (derivedAttributes != null)
            {
               if (derivedAttributes instanceof Symbol)
               {
                  derivedAttributes = new Pair(derivedAttributes);
               }


               if (derivedMapping.getMetaclass() != refMapping.getMetaclass())
               {
                  derivedAttributes = new Pair(Symbol.ATAT,
                     new Pair(derivedMapping.getMetaclass().getSymbol(), derivedAttributes));
                  attributes = new Pair(derivedAttributes, attributes);
               }
               else
               {
                  attributes = Pair.nconc((Pair)derivedAttributes, attributes);
               }
            }
         }


         currPathSet.remove(refPart);
      }


      return (m_attribute == null) ? attributes : new Pair(m_attribute.getSymbol(), attributes);
   }

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