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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.
///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2014, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// Neither the name of the Burton Computer Corporation nor the names
// of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package org.javimmutable.collections.tree;
import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Holders;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.cursors.StandardCursor;
import java.util.Collection;
import java.util.Comparator;
public class EmptyNode
extends TreeNode
{
static final EmptyNode INSTANCE = new EmptyNode();
private EmptyNode()
{
}
@SuppressWarnings("unchecked")
public static EmptyNode of()
{
return (EmptyNode)INSTANCE;
}
@Override
public V getValueOr(Comparator props,
K key,
V defaultValue)
{
return defaultValue;
}
@Override
public Holder find(Comparator props,
K key)
{
return Holders.of();
}
@Override
public Holder> findEntry(Comparator props,
K key)
{
return Holders.of();
}
@Override
public void addEntriesTo(Collection> collection)
{
}
@Override
public Cursor> cursor()
{
return StandardCursor.of();
}
@Override
public boolean isEmpty()
{
return true;
}
@Override
int verifyDepthsMatch()
{
return 0;
}
@Override
K getMaxKey()
{
return null;
}
@Override
UpdateResult assignImpl(Comparator props,
K key,
V value)
{
return UpdateResult.createInPlace(new LeafNode(key, value), 1);
}
@Override
DeleteResult deleteImpl(Comparator props,
K key)
{
return DeleteResult.createUnchanged();
}
@Override
DeleteMergeResult leftDeleteMerge(Comparator props,
TreeNode node)
{
throw new UnsupportedOperationException();
}
@Override
DeleteMergeResult rightDeleteMerge(Comparator props,
TreeNode node)
{
throw new UnsupportedOperationException();
}
}