/*
* Copyright 2013 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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 org.switchyard.component.camel.model;
import java.io.IOException;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.util.List;
import org.switchyard.common.type.classpath.AbstractTypeFilter;
import org.switchyard.common.type.classpath.ClasspathScanner;
import org.switchyard.component.camel.Route;
import org.switchyard.component.camel.model.v1.V1CamelImplementationModel;
import org.switchyard.config.model.Scannable;
import org.switchyard.config.model.Scanner;
import org.switchyard.config.model.ScannerInput;
import org.switchyard.config.model.ScannerOutput;
import org.switchyard.config.model.composite.ComponentModel;
import org.switchyard.config.model.composite.ComponentServiceModel;
import org.switchyard.config.model.composite.CompositeModel;
import org.switchyard.config.model.composite.InterfaceModel;
import org.switchyard.config.model.composite.v1.V1ComponentModel;
import org.switchyard.config.model.composite.v1.V1ComponentServiceModel;
import org.switchyard.config.model.composite.v1.V1CompositeModel;
import org.switchyard.config.model.composite.v1.V1InterfaceModel;
import org.switchyard.config.model.switchyard.SwitchYardModel;
import org.switchyard.config.model.switchyard.SwitchYardNamespace;
import org.switchyard.config.model.switchyard.v1.V1SwitchYardModel;
/**
* Scans for classes with @Route methods and creates a Camel Route definition
* for each.
* @author <a href="mailto:eduardo.devera@gmail.com">eduardo.devera</a>
*/
public class RouteScanner implements Scanner<SwitchYardModel> {
@Override
public ScannerOutput<SwitchYardModel> scan(ScannerInput<SwitchYardModel> input) throws IOException {
SwitchYardNamespace switchyardNamespace = input.getSwitchyardNamespace();
SwitchYardModel switchyardModel = new V1SwitchYardModel(switchyardNamespace.uri());
CompositeModel compositeModel = new V1CompositeModel();
compositeModel.setName(input.getCompositeName());
CamelNamespace camelNamespace = CamelNamespace.DEFAULT;
for (CamelNamespace value : CamelNamespace.values()) {
if (value.versionMatches(switchyardNamespace)) {
camelNamespace = value;
break;
}
}
List<Class<?>> routeClasses = scanForRoutes(input.getURLs());
// Create a Camel component model for each class
for (Class<?> routeClass : routeClasses) {
// Top-level component definition
ComponentModel componentModel = new V1ComponentModel();
componentModel.setName(routeClass.getSimpleName());
// Component implementation definition
CamelComponentImplementationModel camelModel = new V1CamelImplementationModel(camelNamespace.uri());
camelModel.setJavaClass(routeClass.getName());
componentModel.setImplementation(camelModel);
compositeModel.addComponent(componentModel);
// Component service definition
ComponentServiceModel serviceModel = new V1ComponentServiceModel(switchyardNamespace.uri());
InterfaceModel csiModel = new V1InterfaceModel(InterfaceModel.JAVA);
Class<?> serviceInterface = routeClass.getAnnotation(Route.class).value();
serviceModel.setName(getServiceName(routeClass));
csiModel.setInterface(serviceInterface.getName());
serviceModel.setInterface(csiModel);
componentModel.addService(serviceModel);
// Component reference definition(s)
// Need to add these!
}
if (!compositeModel.getModelChildren().isEmpty()) {
switchyardModel.setComposite(compositeModel);
}
return new ScannerOutput<SwitchYardModel>().setModel(switchyardModel);
}
private String getServiceName(Class<?> routeClass) {
return routeClass.getAnnotation(Route.class).name().equals(Route.EMPTY)
? routeClass.getAnnotation(Route.class).value().getSimpleName()
: routeClass.getAnnotation(Route.class).name();
}
private List<Class<?>> scanForRoutes(List<URL> urls) throws IOException {
AbstractTypeFilter filter = new RouteFilter();
ClasspathScanner scanner = new ClasspathScanner(filter);
for (URL url : urls) {
scanner.scan(url);
}
return filter.getMatchedTypes();
}
private class RouteFilter extends AbstractTypeFilter {
@Override
public boolean matches(Class<?> clazz) {
// Check to see if it's been excluded from scans
Scannable scannable = clazz.getAnnotation(Scannable.class);
if (scannable != null && !scannable.value()) {
return false;
}
// Can't be an interface or abstract class
if (clazz.isInterface() || Modifier.isAbstract(clazz.getModifiers())) {
return false;
}
// Must have a no-arg constructor
try {
clazz.getConstructor();
} catch (NoSuchMethodException e) {
return false;
}
// Check for @Route definitions
return clazz.isAnnotationPresent(Route.class);
}
}
}