package com.github.marschall.memoryfilesystem;
import static java.nio.file.StandardOpenOption.CREATE;
import static java.nio.file.StandardOpenOption.TRUNCATE_EXISTING;
import static java.nio.file.StandardOpenOption.WRITE;
import java.nio.file.OpenOption;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
final class DefaultOpenOptions extends AbstractSet<OpenOption> {
static final Set<OpenOption> INSTANCE = new DefaultOpenOptions();
private DefaultOpenOptions() {
super();
}
@Override
public Iterator<OpenOption> iterator() {
return new DefaultOpenOptionsIterator();
}
@Override
public boolean isEmpty() {
return false;
}
@Override
public boolean contains(Object o) {
return o == CREATE || o == TRUNCATE_EXISTING || o == WRITE;
}
@Override
public boolean remove(Object o) {
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection<?> c) {
throw new UnsupportedOperationException();
}
@Override
public int size() {
return 3;
}
static final class DefaultOpenOptionsIterator implements Iterator<OpenOption> {
private int index;
DefaultOpenOptionsIterator() {
this.index = 0;
}
@Override
public boolean hasNext() {
return this.index < 3;
}
@Override
public OpenOption next() {
this.index += 1;
switch (this.index) {
case 1:
return CREATE;
case 2:
return TRUNCATE_EXISTING;
case 3:
return WRITE;
default:
throw new NoSuchElementException();
}
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}