package com.temp.shared.utils;

import java.util.*;

public class NoEqualsUniqueCollector<E, C extends Comparable<C>> {
    private final List<E> entries = new ArrayList<E>();
    private final Set<C> uniqueKeys = new HashSet<C>();
    private final NoEqualsHelper<E, C> helper;

    public NoEqualsUniqueCollector( NoEqualsHelper<E, C> helper ) {
        this.helper = helper;
    }

    public boolean isEmpty() {
        return entries.isEmpty();
    }

    public void add( E entry ) {
        if ( (entry != null) && uniqueKeys.add( helper.getProxyValue( entry ) ) ) {
            entries.add( entry );
        }
    }

    public void addAll( Collection<E> entries ) {
        if ( entries != null ) {
            for ( E entry : entries ) {
                add( entry );
            }
        }
    }

    public E[] toArray() {
        return entries.toArray( helper.createArray( entries.size() ) );
    }

    public List<E> toList() {
        return new ArrayList<E>( entries );
    }
}