Examples of com.google.gwt.core.ext.UnableToCompleteException

com.google.gwt.core.ext.UnableToCompleteException
low-level detail and the caught exception. // logger.log("detailed problem explanation for user eyes...", e); // Do not include the caught exception. // throw new UnableToCompleteException(); } } void highLevel(Logger logger) { try { // Multiple calls are shown to indicate that the process can // include any number of steps. // lowLevel(logger); lowLevel(logger); lowLevel(logger); } catch (UnableToCompleteException e) { logger.log("high-level thing failed", e); } }

      extendsGadget = extendsGadget.getSuperclass();


      if (extendsGadget == null) {
        logger.log(TreeLogger.ERROR, "Unable to find Gadget in type hierarchy",
            null);
        throw new UnableToCompleteException();
      }
    }


    JClassType[] typeArgs = paramType.getTypeArgs();


    assert typeArgs.length == 1;
    JClassType toReturn = typeArgs[0].isClassOrInterface();
    if (toReturn == null) {
      logger.log(TreeLogger.ERROR,
          "A Gadget's UserPreferences type must be an interface", null);
      throw new UnableToCompleteException();
    }


    return toReturn;
  }

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        } else if (!value.equals(m.getDefaultValue())) {
          elt.setAttribute(name, value.toString());
        }
      } catch (IllegalAccessException e) {
        logger.log(TreeLogger.ERROR, "Could not decode annotation", e);
        throw new UnableToCompleteException();
      } catch (InvocationTargetException e) {
        logger.log(TreeLogger.ERROR, "Could not decode annotation", e);
        throw new UnableToCompleteException();
      }
    }
  }

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    JClassType sourceType = typeOracle.findType(typeName);


    // Ensure that the requested type exists
    if (sourceType == null) {
      logger.log(TreeLogger.ERROR, "Could not find requested typeName", null);
      throw new UnableToCompleteException();
    }


    // Make sure the UserPreferences type is correctly defined
    validateType(logger, sourceType);


    // Pick a name for the generated class to not conflict.
    String generatedSimpleSourceName = sourceType.getSimpleSourceName()
        + "UserPreferencesImpl";


    // Begin writing the generated source.
    ClassSourceFileComposerFactory f = new ClassSourceFileComposerFactory(
        sourceType.getPackage().getName(), generatedSimpleSourceName);
    f.addImport(GWT.class.getName());
    f.addImport(PreferencesUtil.class.getName());
    f.addImplementedInterface(typeName);


    // All source gets written through this Writer
    PrintWriter out = context.tryCreate(logger,
        sourceType.getPackage().getName(), generatedSimpleSourceName);


    // If an implementation already exists, we don't need to do any work
    if (out != null) {
      JClassType preferenceType = typeOracle.findType(Preference.class.getName().replace('$', '.'));
      assert preferenceType != null;


      // We really use a SourceWriter since it's convenient
      SourceWriter sw = f.createSourceWriter(context, out);


      for (JMethod m : sourceType.getOverridableMethods()) {
        JClassType extendsPreferenceType = m.getReturnType().isClassOrInterface();
        if (extendsPreferenceType == null
            || !preferenceType.isAssignableFrom(extendsPreferenceType)) {
          logger.log(TreeLogger.ERROR, "Cannot assign "
              + extendsPreferenceType.getQualifiedSourceName() + " to "
              + preferenceType.getQualifiedSourceName(), null);
          throw new UnableToCompleteException();
        }


        // private final FooProperty __propName = new FooProperty() {...}
        sw.println("private final "
            + extendsPreferenceType.getParameterizedQualifiedSourceName()

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  protected void validateType(TreeLogger logger, JClassType sourceType)
      throws UnableToCompleteException {
    if (sourceType.isInterface() == null) {
      logger.log(TreeLogger.ERROR, "UserPreferences type must be interfaces",
          null);
      throw new UnableToCompleteException();
    }
  }

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    JClassType sourceType = typeOracle.findType(typeName);


    // Ensure that the requested type exists
    if (sourceType == null) {
      logger.log(TreeLogger.ERROR, "Could not find requested typeName", null);
      throw new UnableToCompleteException();
    }


    // Make sure the Gadget type is correctly defined
    validateType(logger, sourceType);


    // Pick a name for the generated class to not conflict.
    String generatedSimpleSourceName = sourceType.getSimpleSourceName()
        + "GadgetImpl";


    // Begin writing the generated source.
    ClassSourceFileComposerFactory f = new ClassSourceFileComposerFactory(
        sourceType.getPackage().getName(), generatedSimpleSourceName);
    f.addImport(GWT.class.getName());
    f.setSuperclass(typeName);


    // All source gets written through this Writer
    PrintWriter out = context.tryCreate(logger,
        sourceType.getPackage().getName(), generatedSimpleSourceName);


    // If an implementation already exists, we don't need to do any work
    if (out != null) {


      JClassType userPrefsType = GadgetUtils.getUserPrefsType(logger,
          typeOracle, sourceType);


      // We really use a SourceWriter since it's convenient
      SourceWriter sw = f.createSourceWriter(context, out);
      sw.println("public " + generatedSimpleSourceName + "() {");
      sw.indent();
      sw.println("nativeInit();");
      sw.println("init((" + userPrefsType.getQualifiedSourceName()
          + ")GWT.create(" + userPrefsType.getQualifiedSourceName()
          + ".class));");
      sw.outdent();
      sw.println("}");


      sw.println("private native void nativeInit() /*-{");
      sw.indent();
      for (JClassType interfaceType : sourceType.getImplementedInterfaces()) {
        generateFeatureInitializer(logger, typeOracle, sw, sourceType,
            interfaceType);
      }
      sw.outdent();
      sw.println("}-*/;");


      // Write out the manifest
      OutputStream manifestOut = context.tryCreateResource(logger, typeName
          + ".gadget.xml");
      if (manifestOut == null) {
        logger.log(TreeLogger.ERROR, "Gadget manifest was already created",
            null);
        throw new UnableToCompleteException();
      }


      generateGadgetManifest(logger, typeOracle, sourceType, new PrintWriter(
          new OutputStreamWriter(manifestOut)));
      context.commitResource(logger, manifestOut);

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    if (prefType == null || !preferenceType.isAssignableFrom(prefType)) {
      logger.log(TreeLogger.ERROR, m.getReturnType().getQualifiedSourceName()
          + " is not assignable to " + preferenceType.getQualifiedSourceName(),
          null);
      throw new UnableToCompleteException();
    }


    DataType dataType = prefType.getAnnotation(DataType.class);


    if (dataType == null) {
      logger.log(TreeLogger.ERROR, prefType
          + " must define a DataType annotation", null);
      throw new UnableToCompleteException();
    }


    userPref.setAttribute("name", m.getName());
    userPref.setAttribute("datatype", dataType.value());


    PreferenceAttributes attributes = m.getAnnotation(PreferenceAttributes.class);
    if (attributes != null) {
      GadgetUtils.writeAnnotationToElement(logger, attributes, userPref);


      switch (attributes.options()) {
        case HIDDEN:
          userPref.setAttribute("datatype", "hidden");
          break;
        case NORMAL:
          break;
        case REQUIRED:
          userPref.setAttribute("required", "true");
          break;
        default:
          logger.log(TreeLogger.ERROR, "Unknown Option "
              + attributes.options().name(), null);
          throw new UnableToCompleteException();
      }
    }


    // Allow type-specific modifications to the userpref Element to be made
    PreferenceGenerator prefGenerator = GadgetUtils.getPreferenceGenerator(

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    JMethod[] methods = featureType.getMethods();
    if (methods.length != 1) {
      logger.log(TreeLogger.ERROR,
          "A Feature interface must define exactly one method", null);
      throw new UnableToCompleteException();
    }


    JMethod m = methods[0];
    JParameter[] params = m.getParameters();


    if (params.length != 1) {
      logger.log(TreeLogger.ERROR, m.getName()
          + " must have exactly one parameter", null);
      throw new UnableToCompleteException();
    }


    JClassType paramType = params[0].getType().isClass();
    JClassType gadgetFeatureType = typeOracle.findType(GadgetFeature.class.getName());
    assert gadgetFeatureType != null;


    if (paramType == null || paramType.isAbstract()) {
      logger.log(TreeLogger.ERROR, "The parameter " + params[0].getName()
          + " must be a concrete class", null);
      throw new UnableToCompleteException();


    } else if (!gadgetFeatureType.isAssignableFrom(paramType)) {
      logger.log(TreeLogger.ERROR, "The parameter " + params[0].getName()
          + " must be assignable to GadgetFeature", null);
      throw new UnableToCompleteException();


    } else {
      try {
        paramType.getConstructor(new JType[0]);
      } catch (NotFoundException e) {
        logger.log(TreeLogger.ERROR,
            "The parameter type must have a zero-arg constructor", e);
        throw new UnableToCompleteException();
      }
    }


    sw.println("this.@" + gadgetType.getQualifiedSourceName() + "::"
        + m.getName() + "(" + paramType.getJNISignature() + ")(@"

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      output = implLS.createLSOutput();
      output.setCharacterStream(out);
      serializer = implLS.createLSSerializer();
    } catch (ClassNotFoundException e) {
      logger.log(TreeLogger.ERROR, "Could not create document", e);
      throw new UnableToCompleteException();
    } catch (IllegalAccessException e) {
      logger.log(TreeLogger.ERROR, "Could not create document", e);
      throw new UnableToCompleteException();
    } catch (InstantiationException e) {
      logger.log(TreeLogger.ERROR, "Could not create document", e);
      throw new UnableToCompleteException();
    }


    // Root elements
    Element module = (Element) d.appendChild(d.createElement("Module"));
    Element modulePrefs = (Element) module.appendChild(d.createElement("ModulePrefs"));

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  protected void validateType(TreeLogger logger, JClassType type)
      throws UnableToCompleteException {
    if (!type.isDefaultInstantiable()) {
      logger.log(TreeLogger.ERROR, "Gadget types must be default instantiable",
          null);
      throw new UnableToCompleteException();
    }
  }

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  public void exportClosure(JExportableClassType requestedType)
      throws UnableToCompleteException {


    if (requestedType == null) {
      logger.log(TreeLogger.ERROR, "exportClosure: requestedType is null", null);
      throw new UnableToCompleteException();
    }


    // get the name of the Java class implementing Exporter
    String genName = requestedType.getExporterImplementationName();

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