Bug 338552

Description Markus Keller 2011-03-01 11:11:00 EST

HEAD, follow-up to bug 322817

The JavaCore.COMPILER_PB_UNAVOIDABLE_GENERIC_TYPE_PROBLEMS option misses raw method arguments for a method that has parameterized types as arguments:

package problems.unchecked;
import java.util.*;
public class MyASTNode {
    List fragments() {
        return Collections.emptyList();
    }
}


package problems.unchecked;
import java.lang.reflect.Array;
import java.util.*;
public class UncheckedProblem {
    
    // no warnings:
    Integer[] m1(List<Integer> list) {
        return toArray(list, Integer.class);
    }
    
    Integer[] m2(List list) { // good warning
        return toArray(list, Integer.class); // good warning
    }
    
    Integer[] m3(MyASTNode node) {
        // TODO: compiler option should hide this warning: 
        return toArray(node.fragments(), Integer.class); // unavoidable warning
    }

    /**
     * Returns an array containing all of the elements in the given collection.
     * This is a compile-time type-safe version of
     * {@link Collection#toArray(Object[])}.
     * 
     * @param c the source collection
     * @param clazz the type of the array elements
     * @param <A> the type of the array elements
     * @return an array of type <code>A</code> containing all of the elements
     *         in the given collection
     */
    public static <A> A[] toArray(Collection<? extends A> c, Class<A> clazz) {
    	Object array= Array.newInstance(clazz, c.size());
    	@SuppressWarnings("unchecked")
        A[] typedArray = c.toArray((A[]) array);
        return typedArray;
    }
}