50 lines
1.6 KiB
Java
50 lines
1.6 KiB
Java
package org.gcube.data.access.storagehub.handlers.content;
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import java.util.Arrays;
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import java.util.HashMap;
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import java.util.Set;
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import javax.inject.Singleton;
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import org.gcube.common.storagehub.model.annotations.MimeTypeHandler;
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import org.reflections.Reflections;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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@Singleton
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public class ContentHandlerFactory {
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private static Logger logger = LoggerFactory.getLogger(ContentHandlerFactory.class);
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private Reflections reflection = new Reflections();
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private static HashMap<String, Class<? extends ContentHandler>> handlerMap = new HashMap<String, Class<? extends ContentHandler>>();
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private Class<? extends ContentHandler> defaultHandler = GenericFileHandler.class;
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@SuppressWarnings("unchecked")
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public ContentHandlerFactory() {
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Set<Class<?>> classesAnnotated = reflection.getTypesAnnotatedWith(MimeTypeHandler.class);
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for (Class<?> clazz: classesAnnotated ){
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if (ContentHandler.class.isAssignableFrom(clazz)) {
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logger.debug("searching for mimetypes {} with values {}",clazz.getName(), Arrays.toString(clazz.getAnnotation(MimeTypeHandler.class).value()));
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for (String value: clazz.getAnnotation(MimeTypeHandler.class).value()){
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logger.debug("value for class {} is {}",clazz.getName(), value);
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handlerMap.put(value, (Class<? extends ContentHandler>) clazz);
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}
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}
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}
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}
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public ContentHandler create(String mimetype) throws Exception{
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Class<? extends ContentHandler> handlerClass = handlerMap.get(mimetype);
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if (handlerClass!=null)
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return handlerClass.newInstance();
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else
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return defaultHandler.newInstance();
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}
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}
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