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package eu.dnetlib.enabling.annotations;
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import com.google.gson.Gson;
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import eu.dnetlib.rmi.objects.is.DnetResourceType;
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import eu.dnetlib.rmi.soap.exceptions.InformationServiceException;
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public class DnetResourceHelper {
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public static boolean isDnetResource(final Class<?> clazz) {
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return clazz.isAnnotationPresent(DnetResource.class);
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}
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public static boolean isDnetResource(final Object o) {
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return isDnetResource(o.getClass());
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}
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public static final DnetResourceType obtainResourceType(final Class<?> clazz) throws InformationServiceException {
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if (isDnetResource(clazz)) {
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final DnetResource a = clazz.getAnnotation(DnetResource.class);
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return new DnetResourceType(a.type(), a.kind(), a.format());
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} else {
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throw new InformationServiceException("Class " + clazz + " is not a DnetResource (missing annotation)");
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}
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}
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public static final DnetResourceType obtainResourceType(final Object o) throws InformationServiceException {
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return obtainResourceType(o.getClass());
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}
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public static final String convertToString(final Object o) throws InformationServiceException {
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if (isDnetResource(o)) {
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final DnetResource a = o.getClass().getAnnotation(DnetResource.class);
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switch (a.format()) {
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case JSON:
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return new Gson().toJson(o);
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case XML:
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throw new InformationServiceException("NOT IMPLEMENTED");
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case TEXT:
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return o.toString();
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default:
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throw new InformationServiceException("Invalid format " + a.format());
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}
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} else {
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throw new InformationServiceException("Object of " + o.getClass() + " is not a DnetResource (missing annotation)");
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}
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}
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public static final <T> T convertToObject(final String s, final Class<T> clazz) throws InformationServiceException {
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if (isDnetResource(clazz)) {
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final DnetResource a = clazz.getAnnotation(DnetResource.class);
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switch (a.format()) {
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case JSON:
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return new Gson().fromJson(s, clazz);
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case XML:
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throw new InformationServiceException("NOT IMPLEMENTED");
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case TEXT:
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try {
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return clazz.getConstructor(String.class).newInstance(s);
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} catch (Throwable e) {
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throw new InformationServiceException("Cannot instantiate object of Class " + clazz);
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}
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default:
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throw new InformationServiceException("Invalid format " + a.format());
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}
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} else {
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throw new InformationServiceException("Class" + clazz + " is not a DnetResource (missing annotation)");
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}
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}
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}
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