fullstack/algebricks/algebricks-common/src/main/java/edu/uci/ics/hyracks/algebricks/common/utils/ListSet.java

package edu.uci.ics.hyracks.algebricks.common.utils;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class ListSet<E> implements Set<E> {
    private List<E> list = new ArrayList<E>();

    public ListSet() {
    }

    public ListSet(Collection<? extends E> arg) {
        this.addAll(arg);
    }

    @Override
    public boolean add(E arg0) {
        if (list.contains(arg0))
            return false;
        return list.add(arg0);
    }

    @Override
    public boolean addAll(Collection<? extends E> arg0) {
        for (E item : arg0)
            if (list.contains(item))
                return false;
        return list.addAll(arg0);
    }

    @Override
    public void clear() {
        list.clear();
    }

    @Override
    public boolean contains(Object arg0) {
        return list.contains(arg0);
    }

    @Override
    public boolean containsAll(Collection<?> arg0) {
        return list.containsAll(arg0);
    }

    @Override
    public boolean isEmpty() {
        return list.isEmpty();
    }

    @Override
    public Iterator<E> iterator() {
        return list.iterator();
    }

    @Override
    public boolean remove(Object arg0) {
        return list.remove(arg0);
    }

    @Override
    public boolean removeAll(Collection<?> arg0) {
        return list.removeAll(arg0);
    }

    @Override
    public boolean retainAll(Collection<?> arg0) {
        return list.retainAll(arg0);
    }

    @Override
    public int size() {
        return list.size();
    }

    @Override
    public Object[] toArray() {
        return list.toArray();
    }

    @Override
    public <T> T[] toArray(T[] arg0) {
        return list.toArray(arg0);
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean equals(Object arg) {
        if (!(arg instanceof Set))
            return false;
        Set<E> set = (Set<E>) arg;
        for (E item : set) {
            if (!this.contains(item))
                return false;
        }
        for (E item : this) {
            if (!set.contains(item))
                return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return list.toString();
    }

}