/*
* 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.transform.config.model;
import java.io.IOException;
import java.net.URL;
import java.util.List;
import org.switchyard.common.cdi.CDIUtil;
import org.switchyard.common.type.classpath.AbstractTypeFilter;
import org.switchyard.common.type.classpath.ClasspathScanner;
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.switchyard.SwitchYardModel;
import org.switchyard.config.model.switchyard.SwitchYardNamespace;
import org.switchyard.config.model.switchyard.v1.V1SwitchYardModel;
import org.switchyard.config.model.transform.TransformsModel;
import org.switchyard.config.model.transform.v1.V1TransformsModel;
import org.switchyard.transform.config.model.v1.V1JavaTransformModel;
import org.switchyard.transform.internal.TransformerTypes;
import org.switchyard.transform.internal.TransformerUtil;
/**
* Scanner for {@link org.switchyard.transform.Transformer} implementations.
*
* @author <a href="mailto:tom.fennelly@gmail.com">tom.fennelly@gmail.com</a>
*/
public class TransformSwitchYardScanner implements Scanner<SwitchYardModel> {
/**
* {@inheritDoc}
*/
@Override
public ScannerOutput<SwitchYardModel> scan(ScannerInput<SwitchYardModel> input) throws IOException {
SwitchYardNamespace switchyardNamespace = input.getSwitchyardNamespace();
SwitchYardModel switchyardModel = new V1SwitchYardModel(switchyardNamespace.uri());
TransformsModel transformsModel = null;
TransformNamespace transformNamespace = TransformNamespace.DEFAULT;
for (TransformNamespace value : TransformNamespace.values()) {
if (value.versionMatches(switchyardNamespace)) {
transformNamespace = value;
break;
}
}
List<Class<?>> transformerClasses = scanForTransformers(input.getURLs());
for (Class<?> transformer : transformerClasses) {
List<TransformerTypes> supportedTransforms = TransformerUtil.listTransformations(transformer);
for (TransformerTypes supportedTransform : supportedTransforms) {
JavaTransformModel transformModel = new V1JavaTransformModel(transformNamespace.uri());
String bean = CDIUtil.getNamedAnnotationValue(transformer);
if (bean != null) {
transformModel.setBean(bean);
} else {
transformModel.setClazz(transformer.getName());
}
transformModel.setFrom(supportedTransform.getFrom());
transformModel.setTo(supportedTransform.getTo());
if (transformsModel == null) {
transformsModel = new V1TransformsModel(switchyardNamespace.uri());
switchyardModel.setTransforms(transformsModel);
}
transformsModel.addTransform(transformModel);
}
}
return new ScannerOutput<SwitchYardModel>().setModel(switchyardModel);
}
private List<Class<?>> scanForTransformers(List<URL> urls) throws IOException {
AbstractTypeFilter filter = new TransformerInstanceOfFilter();
ClasspathScanner scanner = new ClasspathScanner(filter);
for (URL url : urls) {
scanner.scan(url);
}
return filter.getMatchedTypes();
}
private class TransformerInstanceOfFilter extends AbstractTypeFilter {
@Override
public boolean matches(Class<?> clazz) {
Scannable scannable = clazz.getAnnotation(Scannable.class);
if (scannable != null && !scannable.value()) {
// Marked as being non-scannable...
return false;
}
return TransformerUtil.isTransformer(clazz);
}
}
}