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package org.apache.poi.util;

import java.util.*;

/**
 * A List of objects that are indexed AND keyed by an int; also allows for getting
 * the index of a value in the list
 *
 * 

I am happy is someone wants to re-implement this without using the * internal list and hashmap. If so could you please make sure that * you can add elements half way into the list and have the value-key mappings * update

* * * @author Jason Height */ public class IntMapper { private List elements; private Map valueKeyMap; private static final int _default_size = 10; /** * create an IntMapper of default size */ public IntMapper() { this(_default_size); } public IntMapper(final int initialCapacity) { elements = new ArrayList(initialCapacity); valueKeyMap = new HashMap(initialCapacity); } /** * Appends the specified element to the end of this list * * @param value element to be appended to this list. * * @return true (as per the general contract of the Collection.add * method). */ public boolean add(final T value) { int index = elements.size(); elements.add(value); valueKeyMap.put(value, index); return true; } public int size() { return elements.size(); } public T get(int index) { return elements.get(index); } public int getIndex(T o) { Integer i = valueKeyMap.get(o); if (i == null) return -1; return i.intValue(); } public Iterator iterator() { return elements.iterator(); } } // end public class IntMapper




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