Example #1
0
  BuildMetaClass make(final String proxyClassName,
                      final MetaClass toProxy,
                      final String privateAccessorType) {
    final ClassStructureBuilder builder;



    final boolean renderEqualsAndHash;
    if (!toProxy.isInterface()) {
      renderEqualsAndHash = true;
      if (toProxy.isFinal()) {
        throw new UnproxyableClassException(toProxy, toProxy.getFullyQualifiedName()
            + " is an unproxiable class because it is final");
      }
      if (!toProxy.isDefaultInstantiable()) {
        throw new UnproxyableClassException(toProxy, toProxy.getFullyQualifiedName() + " must have a default " +
            "no-arg constructor");
      }

      builder = ClassBuilder.define(proxyClassName, toProxy).publicScope().body();
    }
    else {
      renderEqualsAndHash = false;
      builder = ClassBuilder.define(proxyClassName).publicScope().implementsInterface(toProxy).body();
    }

    final String proxyVar = "$$_proxy_$$";

    final Set<String> renderedMethods = new HashSet<String>();

    final Map<String, MetaType> typeVariableMap = new HashMap<String, MetaType>();
    final MetaParameterizedType metaParameterizedType = toProxy.getParameterizedType();

    if (metaParameterizedType != null) {
      int i = 0;
      for (final MetaTypeVariable metaTypeVariable : toProxy.getTypeParameters()) {
        typeVariableMap.put(metaTypeVariable.getName(), metaParameterizedType.getTypeParameters()[i++]);
      }
    }

    builder.privateField(proxyVar, toProxy).finish();

    final Set<Map.Entry<String, ProxyProperty>> entries = proxyProperties.entrySet();
    for (final Map.Entry<String, ProxyProperty> entry : entries) {
      builder.privateField(entry.getValue().getEncodedProperty(), entry.getValue().getType()).finish();
      builder.packageMethod(void.class, "$set_" + entry.getKey(), Parameter.of(entry.getValue().getType(), "o"))
          .append(Stmt.loadVariable(entry.getValue().getEncodedProperty()).assignValue(Refs.get("o")))
          .finish();
    }

    for (final MetaMethod method : toProxy.getMethods()) {
      final String methodString = GenUtil.getMethodString(method);
      if (renderedMethods.contains(methodString) || method.getName().equals("hashCode")
          || (method.getName().equals("equals") && method.getParameters().length == 1
          && method.getParameters()[0].getType().getFullyQualifiedName().equals(Object.class.getName()))) continue;

      renderedMethods.add(methodString);

      if ((!method.isPublic() && !method.isProtected()) ||
          method.isSynthetic() ||
          method.isFinal() ||
          method.isStatic() ||
          method.getDeclaringClass().getFullyQualifiedName().equals(Object.class.getName()))
        continue;

      final List<Parameter> methodParms = new ArrayList<Parameter>();
      final MetaParameter[] parameters = method.getParameters();

      for (int i = 0; i < parameters.length; i++) {
        methodParms.add(Parameter.of(parameters[i].getType().getErased(), "a" + i));
      }

      final DefParameters defParameters = DefParameters.fromParameters(methodParms);
      final BlockBuilder methBody = builder.publicMethod(method.getReturnType(), method.getName())
          .annotatedWith(OVERRIDE_ANNOTATION)
          .parameters(defParameters)
          .throws_(method.getCheckedExceptions());

      methBody.appendAll(getAroundInvokeStatements(method));
      methBody.appendAll(getBeforeStatements(method));

      final List<Parameter> parms = defParameters.getParameters();

      final Statement[] statementVars = new Statement[parms.size()];
      for (int i = 0; i < parms.size(); i++) {
        statementVars[i] = loadVariable(parms.get(i).getName());
      }

      if (!method.isPublic()) {
        PrivateAccessUtil.addPrivateAccessStubs(privateAccessorType, builder, method, new Modifier[0]);

        final Statement[] privateAccessStmts = new Statement[statementVars.length + 1];
        privateAccessStmts[0] = Refs.get(proxyVar);
        System.arraycopy(statementVars, 0, privateAccessStmts, 1, statementVars.length);

        if (method.getReturnType().isVoid()) {
          methBody._(loadVariable("this").invoke(PrivateAccessUtil.getPrivateMethodName(method), privateAccessStmts));
        }
        else {
          methBody._(loadVariable("this").invoke(PrivateAccessUtil.getPrivateMethodName(method), privateAccessStmts).returnValue());
        }
      }
      else {
        if (method.getReturnType().isVoid()) {
          methBody._(loadVariable(proxyVar).invoke(method, statementVars));
        }
        else {
          methBody._(loadVariable(proxyVar).invoke(method, statementVars).returnValue());
        }
      }

      methBody.appendAll(getAfterStatements(method));
      methBody.appendAll(getAroundInvokeStatements(method));

      methBody.finish();
    }

    if (renderEqualsAndHash) {
      // implement hashCode()
      builder.publicMethod(int.class, "hashCode")
          .annotatedWith(OVERRIDE_ANNOTATION)
          .body()
          ._(
              If.isNull(loadVariable(proxyVar))
                  ._(throw_(IllegalStateException.class, "call to hashCode() on an unclosed proxy."))
                  .finish()
                  .else_()
                  ._(Stmt.loadVariable(proxyVar).invoke("hashCode").returnValue())
                  .finish()
          )
          .finish();

      // implements equals()
      builder.publicMethod(boolean.class, "equals", Parameter.of(Object.class, "o"))
          .annotatedWith(OVERRIDE_ANNOTATION)
          .body()
          ._(
              If.isNull(loadVariable(proxyVar))
                  ._(throw_(IllegalStateException.class, "call to equals() on an unclosed proxy."))
                  .finish()
                  .else_()
                  ._(Stmt.loadVariable(proxyVar).invoke("equals", Refs.get("o")).returnValue())
                  .finish()
          )
          .finish();
    }

    builder.publicMethod(void.class, PROXY_BIND_METHOD).parameters(DefParameters.of(Parameter.of(toProxy, "proxy")))
        ._(loadVariable(proxyVar).assignValue(loadVariable("proxy"))).finish();

    return builder.getClassDefinition();
  }
  @Override
  protected String generate(TreeLogger logger, GeneratorContext context) {
    final ClassStructureBuilder<?> classBuilder =
        Implementations.extend(NavigationGraph.class, GENERATED_CLASS_NAME);

    // accumulation of (name, pageclass) mappings for dupe detection and dot file generation
    BiMap<String, MetaClass> pageNames = HashBiMap.create();

    // accumulation UniquePageRoles for ensuring there is exactly one.
    Multimap<Class<?>, MetaClass> pageRoles = ArrayListMultimap.create();

    ConstructorBlockBuilder<?> ctor = classBuilder.publicConstructor();
    final Collection<MetaClass> pages = ClassScanner.getTypesAnnotatedWith(Page.class, context);
    for (MetaClass pageClass : pages) {
      if (!pageClass.isAssignableTo(IsWidget.class)) {
        throw new GenerationException(
            "Class "
                + pageClass.getFullyQualifiedName()
                + " is annotated with @Page, so it must implement IsWidget");
      }
      Page annotation = pageClass.getAnnotation(Page.class);
      String pageName = getPageName(pageClass);
      List<Class<? extends PageRole>> annotatedPageRoles = Arrays.asList(annotation.role());

      MetaClass prevPageWithThisName = pageNames.put(pageName, pageClass);
      if (prevPageWithThisName != null) {
        throw new GenerationException(
            "Page names must be unique, but "
                + prevPageWithThisName
                + " and "
                + pageClass
                + " are both named ["
                + pageName
                + "]");
      }
      Statement pageImplStmt = generateNewInstanceOfPageImpl(pageClass, pageName);
      if (annotatedPageRoles.contains(DefaultPage.class)) {
        // need to assign the page impl to a variable and add it to the map twice
        ctor.append(Stmt.declareFinalVariable("defaultPage", PageNode.class, pageImplStmt));
        pageImplStmt = Variable.get("defaultPage");
        ctor.append(Stmt.nestedCall(Refs.get("pagesByName")).invoke("put", "", pageImplStmt));
        ctor.append(
            Stmt.nestedCall(Refs.get("pagesByRole"))
                .invoke("put", DefaultPage.class, pageImplStmt));
      } else if (pageName.equals("")) {
        throw new GenerationException(
            "Page "
                + pageClass.getFullyQualifiedName()
                + " has an empty path. Only the"
                + " page with startingPage=true is permitted to have an empty path.");
      }

      final String fieldName = StringUtils.uncapitalize(pageClass.getName());
      ctor.append(Stmt.declareFinalVariable(fieldName, PageNode.class, pageImplStmt));
      ctor.append(
          Stmt.nestedCall(Refs.get("pagesByName")).invoke("put", pageName, Refs.get(fieldName)));

      for (Class<? extends PageRole> annotatedPageRole : annotatedPageRoles) {
        pageRoles.put(annotatedPageRole, pageClass);
        // DefaultPage is already added above.
        if (!annotatedPageRole.equals(DefaultPage.class))
          ctor.append(
              Stmt.nestedCall(Refs.get("pagesByRole"))
                  .invoke("put", annotatedPageRole, Refs.get(fieldName)));
      }
    }
    ctor.finish();

    renderNavigationToDotFile(pageNames);

    validateDefaultPagePresent(pages, pageRoles);
    validateUnique(pageRoles);

    return classBuilder.toJavaString();
  }