Java tutorial
/* * Copyright 2009 Richard Zschech. * * 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 net.zschech.gwt.comet.rebind; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.io.Serializable; import java.util.List; import net.zschech.gwt.comet.client.SerialMode; import net.zschech.gwt.comet.client.SerialTypes; import com.google.gwt.core.ext.GeneratorContext; import com.google.gwt.core.ext.IncrementalGenerator; import com.google.gwt.core.ext.RebindMode; import com.google.gwt.core.ext.RebindResult; 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.JField; import com.google.gwt.core.ext.typeinfo.JType; import com.google.gwt.core.ext.typeinfo.NotFoundException; import com.google.gwt.core.ext.typeinfo.TypeOracle; import com.google.gwt.dev.util.collect.Lists; import com.google.gwt.rpc.linker.RpcDataArtifact; import com.google.gwt.user.client.rpc.impl.Serializer; import com.google.gwt.user.rebind.ClassSourceFileComposerFactory; import com.google.gwt.user.rebind.SourceWriter; import com.google.gwt.user.rebind.rpc.SerializableTypeOracle; import com.google.gwt.user.rebind.rpc.SerializableTypeOracleBuilder; import com.google.gwt.user.rebind.rpc.SerializationUtils; import com.google.gwt.user.rebind.rpc.TypeSerializerCreator; public class CometSerializerGenerator extends IncrementalGenerator { @Override public long getVersionId() { return 1; } @Override public RebindResult generateIncrementally(TreeLogger logger, GeneratorContext context, String typeName) throws UnableToCompleteException { TypeOracle typeOracle = context.getTypeOracle(); // Create the CometSerializer impl String packageName = "comet"; String className = typeName.replace('.', '_') + "Impl"; PrintWriter printWriter = context.tryCreate(logger, packageName, className); if (printWriter != null) { try { JClassType type = typeOracle.getType(typeName); SerialTypes annotation = type.getAnnotation(SerialTypes.class); if (annotation == null) { logger.log(TreeLogger.ERROR, "No SerialTypes annotation on CometSerializer type: " + typeName); throw new UnableToCompleteException(); } SerializableTypeOracleBuilder typesSentToBrowserBuilder = new SerializableTypeOracleBuilder(logger, context.getPropertyOracle(), context); SerializableTypeOracleBuilder typesSentFromBrowserBuilder = new SerializableTypeOracleBuilder( logger, context.getPropertyOracle(), context); for (Class<? extends Serializable> serializable : annotation.value()) { int rank = 0; if (serializable.isArray()) { while (serializable.isArray()) { serializable = (Class<? extends Serializable>) serializable.getComponentType(); rank++; } } JType resolvedType = typeOracle.getType(serializable.getCanonicalName()); while (rank > 0) { resolvedType = typeOracle.getArrayType(resolvedType); rank--; } typesSentToBrowserBuilder.addRootType(logger, resolvedType); } OutputStream pathInfo = context.tryCreateResource(logger, typeName + ".rpc.log"); PrintWriter writer = new PrintWriter(new OutputStreamWriter(pathInfo)); writer.write("====================================\n"); writer.write("Types potentially sent from browser:\n"); writer.write("====================================\n\n"); writer.flush(); typesSentToBrowserBuilder.setLogOutputWriter(writer); SerializableTypeOracle typesSentFromBrowser = typesSentFromBrowserBuilder.build(logger); writer.write("===================================\n"); writer.write("Types potentially sent from server:\n"); writer.write("===================================\n\n"); writer.flush(); typesSentFromBrowserBuilder.setLogOutputWriter(writer); SerializableTypeOracle typesSentToBrowser = typesSentToBrowserBuilder.build(logger); writer.close(); if (pathInfo != null) { context.commitResource(logger, pathInfo).setPrivate(true); } // Create the serializer String modifiedTypeName = typeName.replace('.', '_') + "Serializer"; TypeSerializerCreator tsc = new TypeSerializerCreator(logger, typesSentFromBrowser, typesSentToBrowser, context, "comet." + modifiedTypeName, modifiedTypeName); String realize = tsc.realize(logger); // Create the CometSerializer impl ClassSourceFileComposerFactory composerFactory = new ClassSourceFileComposerFactory(packageName, className); composerFactory.addImport(Serializer.class.getName()); composerFactory.addImport(SerialMode.class.getName()); composerFactory.setSuperclass(typeName); // TODO is the SERIALIZER required for DE RPC? SourceWriter sourceWriter = composerFactory.createSourceWriter(context, printWriter); sourceWriter.print("private Serializer SERIALIZER = new " + realize + "();"); sourceWriter.print("protected Serializer getSerializer() {return SERIALIZER;}"); sourceWriter .print("public SerialMode getMode() {return SerialMode." + annotation.mode().name() + ";}"); sourceWriter.commit(logger); if (annotation.mode() == SerialMode.DE_RPC) { RpcDataArtifact data = new RpcDataArtifact(type.getQualifiedSourceName()); for (JType t : typesSentToBrowser.getSerializableTypes()) { if (!(t instanceof JClassType)) { continue; } JField[] serializableFields = SerializationUtils .getSerializableFields(context.getTypeOracle(), (JClassType) t); List<String> names = Lists.create(); for (int i = 0, j = serializableFields.length; i < j; i++) { names = Lists.add(names, serializableFields[i].getName()); } data.setFields(SerializationUtils.getRpcTypeName(t), names); } context.commitArtifact(logger, data); } } catch (NotFoundException e) { logger.log(TreeLogger.ERROR, "", e); throw new UnableToCompleteException(); } } return new RebindResult(RebindMode.USE_PARTIAL_CACHED, packageName + '.' + className); } }