ReadOnlyCollectionListAdapterLDM.java

package be.selckin.swu.model;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import org.apache.wicket.model.IModel;

import java.util.Collection;
import java.util.List;

public class ReadOnlyCollectionListAdapterLDM<T> extends ReadOnlyLDM<List<T>> {
    private final IModel<? extends Collection<? extends T>> model;

    public ReadOnlyCollectionListAdapterLDM(IModel<? extends Collection<? extends T>> model) {
        this.model = Preconditions.checkNotNull(model);
    }

    @Override
    protected List<T> load() {
        Collection<? extends T> collection = model.getObject();
        return collection == null ? ImmutableList.<T>of() : ImmutableList.copyOf(collection);
    }

    @Override
    protected void onDetach() {
        model.detach();
    }

    public static <T> ReadOnlyCollectionListAdapterLDM<T> of(IModel<? extends Collection<? extends T>> model) {
        return new ReadOnlyCollectionListAdapterLDM<T>(model);
    }
}