io.katharsis.errorhandling.mapper.DefaultExceptionMapperLookup Maven / Gradle / Ivy
package io.katharsis.errorhandling.mapper;
import io.katharsis.resource.exception.init.InvalidResourceException;
import org.reflections.Reflections;
import java.util.HashSet;
import java.util.Set;
/**
* Exception mapper lookup which scans the classpath for exception mappers which
* are annotated with the {@link ExceptionMapperProvider} annotation.
*/
public class DefaultExceptionMapperLookup implements ExceptionMapperLookup {
private String resourceSearchPackage;
public DefaultExceptionMapperLookup(String resourceSearchPackage) {
this.resourceSearchPackage = resourceSearchPackage;
}
@Override
public Set getExceptionMappers() {
Reflections reflections;
if (resourceSearchPackage != null) {
String[] packageNames = resourceSearchPackage.split(",");
reflections = new Reflections(packageNames);
} else {
reflections = new Reflections(resourceSearchPackage);
}
Set> exceptionMapperClasses = reflections.getTypesAnnotatedWith(ExceptionMapperProvider.class);
Set exceptionMappers = new HashSet();
for (Class> exceptionMapperClazz : exceptionMapperClasses) {
if (!JsonApiExceptionMapper.class.isAssignableFrom(exceptionMapperClazz)) {
throw new InvalidResourceException(exceptionMapperClazz.getCanonicalName() + " is not an implementation of JsonApiExceptionMapper");
}
try {
exceptionMappers.add((JsonApiExceptionMapper extends Throwable>) exceptionMapperClazz.newInstance());
} catch (Exception e) {
throw new InvalidResourceException(exceptionMapperClazz.getCanonicalName() + " can not be initialized", e);
}
}
return exceptionMappers;
}
}
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