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Low overhead, protected views over Java collections
package dev.marksman.collectionviews;
import com.jnape.palatable.lambda.functions.builtin.fn2.ToCollection;
import java.util.ArrayList;
import java.util.List;
final class WrappedListVector extends ConcreteVector
implements NonEmptyVector, Primitive {
/**
* underlying must contain at least one element
*/
private final List underlying;
WrappedListVector(List underlying) {
this.underlying = underlying;
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public int size() {
return underlying.size();
}
@Override
public A unsafeGet(int index) {
return underlying.get(index);
}
@Override
public ImmutableNonEmptyVector toImmutable() {
ArrayList copied = ToCollection.toCollection(ArrayList::new, underlying);
return new ImmutableListVector<>(copied);
}
}