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/**
* Copyright 2011 ArcBees 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.gwtplatform.mvp.rebind;
import java.io.PrintWriter;
import java.util.List;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.core.ext.BadPropertyValueException;
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.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
import com.gwtplatform.mvp.client.Bootstrapper;
import com.gwtplatform.mvp.client.DelayedBindRegistry;
import com.gwtplatform.mvp.client.PreBootstrapper;
/**
* Will generate a {@link com.gwtplatform.mvp.client.ApplicationController}. If the user wants his Generator to be
* generated by GWTP, this Application controller will make sure that the Ginjector is used to trigger the initial
* revealCurrentPlace() from the place manager.
*/
public class ApplicationControllerGenerator extends AbstractGenerator {
private static final String PROPERTY_BOOTSTRAPPER_EMPTY =
"Required configuration property 'gwtp.bootstrapper' can not be empty!.";
private static final String PROPERTY_NOT_FOUND = "Undefined configuration property '%s'.";
private static final String TYPE_NOT_FOUND = "The type '%s' was not found.";
private static final String HINT_URL = "https://github.com/ArcBees/GWTP/wiki/Bootstrapping";
private static final String DOES_NOT_EXTEND_INTERFACE = "'%s' doesn't implement the '%s' interface. See "
+ HINT_URL;
private static final String PROPERTY_NAME_BOOTSTRAPPER = "gwtp.bootstrapper";
private static final String PROPERTY_NAME_PREBOOTSTRAPPER = "gwtp.prebootstrapper";
private static final String SUFFIX = "Impl";
private static final String OVERRIDE = "@Override";
private static final String INJECT_METHOD = "public void init() {";
private static final String DELAYED_BIND = "%s.bind(%s.SINGLETON);";
private static final String ONBOOTSTRAP = "%s.SINGLETON.get%s().onBootstrap();";
private static final String ONPREBOOTSTRAP = "new %s().onPreBootstrap();";
private static final String SCHEDULE_DEFERRED_1 = "Scheduler.get().scheduleDeferred(new ScheduledCommand() {";
private static final String SCHEDULE_DEFERRED_2 = "public void execute() {";
private static final String ONMODULE_LOAD = "public void onModuleLoad() {";
private static final String INIT = "init();";
@Override
public String generate(TreeLogger treeLogger, GeneratorContext generatorContext, String typeName)
throws UnableToCompleteException {
setTypeOracle(generatorContext.getTypeOracle());
setPropertyOracle(generatorContext.getPropertyOracle());
setTreeLogger(treeLogger);
setTypeClass(getType(typeName));
PrintWriter printWriter = tryCreatePrintWriter(generatorContext, SUFFIX);
if (printWriter == null) {
return typeName + SUFFIX;
}
JClassType preBootstrapper = getPreBootstrapper();
ClassSourceFileComposerFactory composer = initComposer(preBootstrapper);
SourceWriter sw = composer.createSourceWriter(generatorContext, printWriter);
JClassType bootstrapper = getBootstrapper();
String ginjectorName = new GinjectorGenerator(bootstrapper).generate(getTreeLogger(),
generatorContext, GinjectorGenerator.DEFAULT_FQ_NAME);
writeInit(sw, ginjectorName, preBootstrapper, bootstrapper);
closeDefinition(sw);
return getPackageName() + "." + getClassName();
}
private ClassSourceFileComposerFactory initComposer(JClassType preBootstrapper) {
ClassSourceFileComposerFactory composer = new ClassSourceFileComposerFactory(getPackageName(), getClassName());
composer.addImport(getTypeClass().getQualifiedSourceName());
if (preBootstrapper != null) {
composer.addImport(preBootstrapper.getQualifiedSourceName());
composer.addImport(Scheduler.class.getCanonicalName());
composer.addImport(ScheduledCommand.class.getCanonicalName());
}
composer.addImplementedInterface(getTypeClass().getName());
composer.addImport(DelayedBindRegistry.class.getCanonicalName());
return composer;
}
/**
* @return The required implementation of {@link Bootstrapper} to use.
*/
private JClassType getBootstrapper() throws UnableToCompleteException {
String typeName = lookupTypeNameByProperty(PROPERTY_NAME_BOOTSTRAPPER);
if (typeName == null) {
getTreeLogger()
.log(TreeLogger.ERROR, PROPERTY_BOOTSTRAPPER_EMPTY);
throw new UnableToCompleteException();
}
return findAndVerifyType(typeName, Bootstrapper.class);
}
/**
* @return The optional implementation of {@link PreBootstrapper} or null.
*/
private JClassType getPreBootstrapper() throws UnableToCompleteException {
String typeName = lookupTypeNameByProperty(PROPERTY_NAME_PREBOOTSTRAPPER);
if (typeName == null) {
return null;
}
return findAndVerifyType(typeName, PreBootstrapper.class);
}
/**
* Retrieve the given single-valued property.
*
* null if the properties' value is empty.
*/
private String lookupTypeNameByProperty(String propertyName) throws UnableToCompleteException {
try {
List values = getPropertyOracle().getConfigurationProperty(propertyName).getValues();
if (values.size() != 0) {
String typeName = values.get(0);
if (typeName != null && !typeName.trim().isEmpty()) {
return typeName;
}
}
} catch (BadPropertyValueException e) {
getTreeLogger().log(TreeLogger.ERROR, String.format(PROPERTY_NOT_FOUND, propertyName));
throw new UnableToCompleteException();
}
return null;
}
/**
* Find the Java type by the given class name and verify that it extends the given interface.
*/
private JClassType findAndVerifyType(String typeName, Class interfaceClass) throws UnableToCompleteException {
JClassType type = getTypeOracle().findType(typeName);
if (type == null) {
getTreeLogger().log(TreeLogger.ERROR, String.format(TYPE_NOT_FOUND, typeName));
throw new UnableToCompleteException();
}
JClassType interfaceType = getType(interfaceClass.getName());
if (!type.isAssignableTo(interfaceType)) {
getTreeLogger().log(
TreeLogger.ERROR,
String.format(DOES_NOT_EXTEND_INTERFACE, typeName, interfaceClass.getSimpleName()));
throw new UnableToCompleteException();
}
return type;
}
private void writeInit(SourceWriter sw, String generatorName, JClassType preBootstrapper, JClassType bootstrapper) {
sw.println(OVERRIDE);
sw.println(INJECT_METHOD);
sw.indent();
if (preBootstrapper != null) {
sw.println(ONPREBOOTSTRAP, preBootstrapper.getSimpleSourceName());
sw.println();
sw.println(SCHEDULE_DEFERRED_1);
sw.indent();
sw.println(OVERRIDE);
sw.println(SCHEDULE_DEFERRED_2);
sw.indent();
}
sw.println(String.format(DELAYED_BIND, DelayedBindRegistry.class.getSimpleName(), generatorName));
sw.println();
sw.println(String.format(ONBOOTSTRAP, generatorName, bootstrapper.getSimpleSourceName()));
sw.outdent();
sw.println("}");
if (preBootstrapper != null) {
sw.outdent();
sw.println("});");
sw.outdent();
sw.println("}");
}
sw.println(OVERRIDE);
sw.println(ONMODULE_LOAD);
sw.indent();
sw.println(INIT);
sw.outdent();
sw.println("}");
}
}
