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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.vaadin.client.connectors.AbstractRendererConnector;
/**
* 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) {
// 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");
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);
bundle.setNeedsSerialize(presentationType);
logger.log(Type.DEBUG, "Presentation type of " + type + " is "
+ presentationType);
}
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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