import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class FilteredElementSource<T, S extends T> implements ElementSource<S> {
    protected final ElementSource<T> collection;
    protected final CollectionFilter<S> filter;

    public FilteredElementSource(ElementSource<T> collection, CollectionFilter<S> filter) {
        this.collection = collection;
        this.filter = filter;

import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

// TODO make this work with pending elements
public class FilteredIndexedElementSource<T, S extends T> extends FilteredElementSource<T, S> implements IndexedElementSource<S> {
    public FilteredIndexedElementSource(ElementSource<T> collection, CollectionFilter<S> filter) {
        super(collection, filter);
    }

    @Override

import org.gradle.api.internal.collections.DefaultCollectionEventRegister;
import org.gradle.api.internal.collections.ElementSource;
import org.gradle.api.internal.collections.FilteredElementSource;
import org.gradle.api.internal.lambdas.SerializableLambdas;
import org.gradle.api.internal.provider.CollectionProviderInternal;
import org.gradle.api.internal.provider.DefaultListProperty;