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- /*
- * Copyright 2000-2014 Vaadin Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not
- * use this file except in compliance with the License. You may obtain a copy of
- * the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations under
- * the License.
- */
- package com.vaadin.server.widgetsetutils.metadata;
-
- import com.google.gwt.core.ext.TreeLogger;
- import com.google.gwt.core.ext.TreeLogger.Type;
- import com.google.gwt.core.ext.UnableToCompleteException;
- import com.google.gwt.core.ext.typeinfo.JClassType;
- import com.google.gwt.core.ext.typeinfo.JMethod;
- import com.google.gwt.core.ext.typeinfo.JParameterizedType;
- import com.google.gwt.core.ext.typeinfo.JType;
- import com.google.gwt.core.ext.typeinfo.NotFoundException;
- import com.vaadin.client.connectors.AbstractRendererConnector;
-
- import elemental.json.JsonValue;
-
- /**
- * Generates type data for renderer connectors.
- * <ul>
- * <li>Stores the return type of the overridden
- * {@link AbstractRendererConnector#getRenderer() getRenderer} method to enable
- * automatic creation of an instance of the proper renderer type.
- * <li>Stores the presentation type of the connector to enable the
- * {@link AbstractRendererConnector#decode(elemental.json.JsonValue) decode}
- * method to work without having to implement a "getPresentationType" method.
- * </ul>
- *
- * @see WidgetInitVisitor
- *
- * @since 7.4
- * @author Vaadin Ltd
- */
- public class RendererVisitor extends TypeVisitor {
-
- @Override
- public void visitConnector(TreeLogger logger, JClassType type,
- ConnectorBundle bundle) throws UnableToCompleteException {
- if (ConnectorBundle.isConnectedRendererConnector(type)) {
- doRendererType(logger, type, bundle);
- doPresentationType(logger, type, bundle);
- }
- }
-
- private static void doRendererType(TreeLogger logger, JClassType type,
- ConnectorBundle bundle) throws UnableToCompleteException {
- // The class in which createRenderer is implemented
- JClassType createRendererClass = ConnectorBundle
- .findInheritedMethod(type, "createRenderer").getEnclosingType();
-
- // Needs GWT constructor if createRenderer is not overridden
- if (createRendererClass.getQualifiedSourceName()
- .equals(AbstractRendererConnector.class.getCanonicalName())) {
-
- JMethod getRenderer = ConnectorBundle.findInheritedMethod(type,
- "getRenderer");
- if (getRenderer.getEnclosingType().getQualifiedSourceName().equals(
- AbstractRendererConnector.class.getCanonicalName())) {
- logger.log(Type.ERROR, type.getQualifiedSourceName()
- + " must override either createRenderer or getRenderer");
- throw new UnableToCompleteException();
- }
- JClassType rendererType = getRenderer.getReturnType().isClass();
-
- bundle.setNeedsGwtConstructor(rendererType);
-
- // Also needs renderer type to find the right GWT constructor
- bundle.setNeedsReturnType(type, getRenderer);
-
- logger.log(Type.DEBUG,
- "Renderer type of " + type + " is " + rendererType);
- }
- }
-
- private void doPresentationType(TreeLogger logger, JClassType type,
- ConnectorBundle bundle) throws UnableToCompleteException {
- JType presentationType = getPresentationType(type, logger);
- bundle.setPresentationType(type, presentationType);
-
- if (!hasCustomDecodeMethod(type, logger)) {
- bundle.setNeedsSerialize(presentationType);
- }
-
- logger.log(Type.DEBUG,
- "Presentation type of " + type + " is " + presentationType);
- }
-
- private static boolean hasCustomDecodeMethod(JClassType type,
- TreeLogger logger) throws UnableToCompleteException {
- try {
- JMethod decodeMethod = ConnectorBundle.findInheritedMethod(type,
- "decode",
- type.getOracle().getType(JsonValue.class.getName()));
- if (decodeMethod == null) {
- throw new NotFoundException();
- }
-
- return !decodeMethod.getEnclosingType().getQualifiedSourceName()
- .equals(AbstractRendererConnector.class.getName());
- } catch (NotFoundException e) {
- logger.log(Type.ERROR,
- "Can't find decode method for renderer " + type, e);
- throw new UnableToCompleteException();
- }
- }
-
- private static JType getPresentationType(JClassType type, TreeLogger logger)
- throws UnableToCompleteException {
- JClassType originalType = type;
- while (type != null) {
- if (type.getQualifiedBinaryName()
- .equals(AbstractRendererConnector.class.getName())) {
- JParameterizedType parameterized = type.isParameterized();
- if (parameterized == null) {
- logger.log(Type.ERROR, type.getQualifiedSourceName()
- + " must define the generic parameter of the inherited "
- + AbstractRendererConnector.class.getSimpleName());
- throw new UnableToCompleteException();
- }
- return parameterized.getTypeArgs()[0];
- }
- type = type.getSuperclass();
- }
- throw new IllegalArgumentException("The type "
- + originalType.getQualifiedSourceName() + " does not extend "
- + AbstractRendererConnector.class.getName());
- }
- }
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