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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.setmap;

import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.JImmutableSet;
import org.javimmutable.collections.JImmutableSetMap;
import org.javimmutable.collections.inorder.JImmutableInsertOrderMap;
import org.javimmutable.collections.serialization.JImmutableInsertOrderSetMapProxy;

import javax.annotation.concurrent.Immutable;
import java.io.Serializable;

/**
 * JImmutableSetMap implementation that allows keys to be traversed in the same order as they
 * were inserted into the collection
 */
@Immutable
public class JImmutableInsertOrderSetMap
    extends AbstractJImmutableSetMap
    implements Serializable
{
    @SuppressWarnings("unchecked")
    private static final JImmutableInsertOrderSetMap EMPTY = new JImmutableInsertOrderSetMap(JImmutableInsertOrderMap.of());
    private static final long serialVersionUID = -121805;

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

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

    @Override
    public void checkInvariants()
    {
        checkSetMapInvariants();
    }

    @Override
    protected JImmutableSetMap create(JImmutableMap> map)
    {
        return new JImmutableInsertOrderSetMap(map);
    }

    private Object writeReplace()
    {
        return new JImmutableInsertOrderSetMapProxy(this);
    }
}