CastUtils.java

package org.codehaus.plexus.component;

import org.apache.xbean.recipe.RecipeHelper;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.Multimap;

@SuppressWarnings({"unchecked", "UnusedDeclaration"})
public final class CastUtils {
    private CastUtils() {
        //utility class, never constructed
    }

    public static <T, U> Map<T, U> cast(Map<?, ?> p) {
        return (Map<T, U>) p;
    }

    public static <T, U> Map<T, U> cast(Map<?, ?> p, Class<T> t, Class<U> u) {
        return (Map<T, U>) p;
    }

    public static <T, U> Multimap<T, U> cast(Multimap<?, ?> p) {
        return (Multimap<T, U>) p;
    }

    public static <T, U> Multimap<T, U> cast(Multimap<?, ?> p, Class<T> t, Class<U> u) {
        return (Multimap<T, U>) p;
    }

    public static <T> Collection<T> cast(Collection<?> p) {
        return (Collection<T>) p;
    }

    public static <T> Collection<T> cast(Collection<?> p, Class<T> cls) {
        return (Collection<T>) p;
    }

    public static <T> List<T> cast(List<?> p) {
        return (List<T>) p;
    }

    public static <T> List<T> cast(List<?> p, Class<T> cls) {
        return (List<T>) p;
    }

    public static <T> Iterator<T> cast(Iterator<?> p) {
        return (Iterator<T>) p;
    }

    public static <T> Iterator<T> cast(Iterator<?> p, Class<T> cls) {
        return (Iterator<T>) p;
    }

    public static <T> Set<T> cast(Set<?> p) {
        return (Set<T>) p;
    }

    public static <T> Set<T> cast(Set<?> p, Class<T> cls) {
        return (Set<T>) p;
    }

    public static <T, U> Map.Entry<T, U> cast(Map.Entry<?, ?> p) {
        return (Map.Entry<T, U>) p;
    }

    public static <T, U> Map.Entry<T, U> cast(Map.Entry<?, ?> p, Class<T> pc, Class<U> uc) {
        return (Map.Entry<T, U>) p;
    }

    // todo remove when recipe helper accecpts nulls
    public static boolean isAssignableFrom(Class<?> expected, Class<?> actual) {
        return actual != null && RecipeHelper.isAssignableFrom( expected, actual );
    }
}