package org.osgl.util;
import org.osgl.$;
import java.util.Iterator;
/**
* Created with IntelliJ IDEA.
* User: luog
* Date: 9/11/13
* Time: 5:20 PM
* To change this template use File | Settings | File Templates.
*/
class FlatMappedRSeq<T, R> extends ReversibleSeqBase<R> {
private C.ReversibleSequence<? extends T> data;
private $.F1<? super T, ? extends Iterable<? extends R>> mapper;
FlatMappedRSeq(C.ReversibleSequence<? extends T> rseq, $.Function<? super T, ? extends Iterable<? extends R>> mapper) {
E.NPE(rseq, mapper);
this.data = rseq;
this.mapper = $.f1(mapper);
}
@Override
public int size() throws UnsupportedOperationException {
return data.size();
}
@Override
public Iterator<R> iterator() {
return Iterators.flatMap(data.iterator(), mapper);
}
@Override
public Iterator<R> reverseIterator() {
return Iterators.flatMap(data.reverseIterator(), mapper);
}
static <T, R> C.ReversibleSequence<R>
of(C.ReversibleSequence<? extends T> data, $.Function<? super T, ? extends Iterable<? extends R>> mapper) {
return new FlatMappedRSeq<T, R>(data, mapper);
}
}