SCViewer/com.minres.scviewer.databas.../src/org/apache/jdbm/HTreeSet.java

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package org.apache.jdbm;
import java.util.AbstractSet;
import java.util.Iterator;
/**
* Wrapper for HTree to implement java.util.Map interface
*/
class HTreeSet<E> extends AbstractSet<E> {
final HTree<E, Object> map;
HTreeSet(HTree map) {
this.map = map;
}
public Iterator<E> iterator() {
return map.keySet().iterator();
}
public int size() {
return map.size();
}
public boolean isEmpty() {
return map.isEmpty();
}
public boolean contains(Object o) {
return map.containsKey(o);
}
public boolean add(E e) {
return map.put(e, Utils.EMPTY_STRING) == null;
}
public boolean remove(Object o) {
return map.remove(o) == Utils.EMPTY_STRING;
}
public void clear() {
map.clear();
}
}