insertionsortedset.java

来自「java 写的一个新闻发布系统」· Java 代码 · 共 52 行

package org.jahia.utils;

import java.util.*;


/**
 * <p>Title: Implementation of a set that is ordered by insertion order</p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: Jahia Ltd</p>
 * @author Serge Huber
 * @version 1.0
 */

public class InsertionSortedSet extends AbstractSet {

    private ArrayList internalSet;

    public InsertionSortedSet() {
        internalSet = new ArrayList();
    }

    public InsertionSortedSet(Collection c) {
        internalSet = new ArrayList(c);
    }

    protected void setInternalList (ArrayList internalList) {
        this.internalSet = internalList;
    }

    public boolean add(Object o)
        throws UnsupportedOperationException,
        NullPointerException,
        ClassCastException,
        IllegalArgumentException {
        if (internalSet.contains(o)) {
            return false;
        } else {
            internalSet.add(o);
            return true;
        }
    }

    public Iterator iterator() {
        return internalSet.iterator();
    }

    public int size() {
        return internalSet.size();
    }

}