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Library providing immutable/persistent collection classes for Java. While collections are immutable they provide methods for adding and removing values by creating new modified copies of themselves. Each copy shares almost all of its structure with other copies to minimize memory consumption.

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// Burton Computer Corporation
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package org.javimmutable.collections.listmap;

import org.javimmutable.collections.JImmutableList;
import org.javimmutable.collections.JImmutableListMap;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.inorder.JImmutableInsertOrderMap;

import javax.annotation.concurrent.Immutable;

/**
 * JImmutableListMap implementation that allows keys to be traversed in the same order as they
 * were inserted into the collection.
 */
@Immutable
public class JImmutableInsertOrderListMap
    extends AbstractJImmutableListMap
{
    @SuppressWarnings("unchecked")
    private static final JImmutableInsertOrderListMap EMPTY = new JImmutableInsertOrderListMap(JImmutableInsertOrderMap.of());

    private JImmutableInsertOrderListMap(JImmutableMap> contents)
    {
        super(contents);
    }

    @SuppressWarnings("unchecked")
    public static  JImmutableInsertOrderListMap of()
    {
        return (JImmutableInsertOrderListMap)EMPTY;
    }

    @Override
    public void checkInvariants()
    {
        checkListMapInvariants();
        //TODO: fix generalized checkInvariants()
    }

    @Override
    protected JImmutableListMap create(JImmutableMap> map)
    {
        return new JImmutableInsertOrderListMap<>(map);
    }
}