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package com.sun.jersey.server.impl.cdi;
import java.util.Collections;
import java.util.Set;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.AmbiguousResolutionException;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
/**
* Utility methods for CDI BeanManager and Bean classes.
*
* @author robc
* @author [email protected]
*/
public class Utils {
private Utils() {}
public static Bean getBean(BeanManager bm, Class c) {
final Set> bs = bm.getBeans(c);
if (bs.isEmpty()) {
return null;
}
try {
return bm.resolve(bs);
} catch(AmbiguousResolutionException ex) {
// Check if there is a shared base class of c
// If so reduce the set of beans whose class equals c and resolve
if (isSharedBaseClass(c, bs)) {
try {
return bm.resolve(getBaseClassSubSet(c, bs));
} catch (AmbiguousResolutionException ex2) {
return null;
}
}
return null;
}
}
public static T getInstance(BeanManager bm, Class c) {
Bean b = getBean(bm, c);
if (b == null) {
return null;
}
CreationalContext cc = bm.createCreationalContext(b);
return c.cast(bm.getReference(b, c, cc));
}
private static boolean isSharedBaseClass(Class c, Set> bs) {
for (Bean b : bs) {
if (!c.isAssignableFrom(b.getBeanClass())) {
return false;
}
}
return true;
}
private static Set> getBaseClassSubSet(Class c, Set> bs) {
for (Bean b : bs) {
if (c == b.getBeanClass()) {
return Collections.>singleton(b);
}
}
return bs;
}
}