| // Copyright (C) 2012 The Android Open Source Project |
| // Copyright 2008 Google Inc. |
| // |
| // 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.google.gerrit.plugin.rebind; |
| |
| import com.google.gwt.core.client.GWT; |
| import com.google.gwt.core.ext.Generator; |
| import com.google.gwt.core.ext.GeneratorContext; |
| import com.google.gwt.core.ext.TreeLogger; |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.core.ext.typeinfo.JClassType; |
| import com.google.gwt.core.ext.typeinfo.TypeOracle; |
| import com.google.gwt.user.rebind.ClassSourceFileComposerFactory; |
| import com.google.gwt.user.rebind.SourceWriter; |
| import java.io.PrintWriter; |
| |
| /** |
| * Write the top layer in the Gadget bootstrap sandwich and generate a stub manifest that will be |
| * completed by the linker. |
| * |
| * <p>Based on gwt-gadgets GadgetGenerator class |
| */ |
| public class PluginGenerator extends Generator { |
| @Override |
| public String generate(TreeLogger logger, GeneratorContext context, String typeName) |
| throws UnableToCompleteException { |
| |
| // The TypeOracle knows about all types in the type system |
| TypeOracle typeOracle = context.getTypeOracle(); |
| |
| // Get a reference to the type that the generator should implement |
| 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() + "PluginImpl"; |
| |
| // 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) { |
| |
| // We really use a SourceWriter since it's convenient |
| SourceWriter sw = f.createSourceWriter(context, out); |
| sw.commit(logger); |
| } |
| |
| return f.getCreatedClassName(); |
| } |
| |
| protected void validateType(TreeLogger logger, JClassType type) throws UnableToCompleteException { |
| if (!type.isDefaultInstantiable()) { |
| logger.log(TreeLogger.ERROR, "Plugin types must be default instantiable", null); |
| throw new UnableToCompleteException(); |
| } |
| } |
| } |