102 lines
2.4 KiB
Java
102 lines
2.4 KiB
Java
package org.gcube.smartgears.configuration.container;
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import static org.gcube.smartgears.utils.Utils.*;
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import java.io.InputStream;
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import java.lang.reflect.Modifier;
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import java.util.HashSet;
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import java.util.ServiceLoader;
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import java.util.Set;
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import javax.xml.bind.JAXBContext;
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import javax.xml.bind.JAXBException;
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import org.gcube.smartgears.handlers.container.ContainerHandler;
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import org.gcube.smartgears.utils.Utils;
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/**
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* Binds {@link ContainerConfiguration}s to and from XML serialisations.
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*
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* @author Fabio Simeoni
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*
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*/
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public class ContainerConfigurationBinder {
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/**
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* Returns a {@link ContainerConfiguration} from its XML serialisation.
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*
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* @param stream the serialisation
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* @return the configuration
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* @throws RuntimeException if the serialisation is invalid
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*/
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public ContainerConfiguration bind(InputStream stream) {
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try {
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JAXBContext ctx = JAXBContext.newInstance(ContainerConfiguration.class);
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ContainerConfiguration config = (ContainerConfiguration) ctx.createUnmarshaller().unmarshal(stream);
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return config;
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} catch (JAXBException e) {
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throw new RuntimeException("invalid container configuration", e);
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}
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finally {
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Utils.closeSafely(stream);
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}
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}
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/**
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* Returns the handlers of the container from their XML serialisation.
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*
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* @param stream the serialisation
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* @return the handlers
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* @throws RuntimeException if the serialisation is invalid
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*/
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public ContainerHandlers bindHandlers(InputStream stream) {
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//collects handler classes
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Set<Class<?>> classes = scanForConfigurationElements();
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try {
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JAXBContext ctx = JAXBContext.newInstance(classes.toArray(new Class<?>[0]));
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return (ContainerHandlers) ctx.createUnmarshaller().unmarshal(stream);
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} catch (JAXBException e) {
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throw unchecked(e);
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}
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}
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private Set<Class<?>> scanForConfigurationElements() throws RuntimeException {
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@SuppressWarnings("all")
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ServiceLoader<ContainerHandler> handlerLoader = (ServiceLoader) ServiceLoader.load(ContainerHandler.class);
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Set<Class<?>> scanned = new HashSet<Class<?>>();
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for (ContainerHandler handler : handlerLoader) {
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Class<?> handlerClass = handler.getClass();
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if (handlerClass.isInterface() || handlerClass.getModifiers() == Modifier.ABSTRACT)
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continue;
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else
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scanned.add(handlerClass);
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}
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//add top-level configuration
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scanned.add(ContainerHandlers.class);
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return scanned;
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}
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}
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