org.javimmutable.collections.array.trie32.TrieNode Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of javimmutable-collections Show documentation
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.
There is a newer version: 3.2.1
Show newest version
///###////////////////////////////////////////////////////////////////////////
//
// 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,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package org.javimmutable.collections.array.trie32;

import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Indexed;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.common.MutableDelta;

import javax.annotation.concurrent.Immutable;

@Immutable
public abstract class TrieNode
{
    public static final int ROOT_SHIFT = 30;

    public abstract boolean isEmpty();

    public abstract T getValueOr(int shift,
                                 int index,
                                 T defaultValue);

    public abstract  V getValueOr(int shift,
                                        int index,
                                        K key,
                                        Transforms transforms,
                                        V defaultValue);

    public abstract Holder find(int shift,
                                   int index);

    public abstract  Holder find(int shift,
                                          int index,
                                          K key,
                                          Transforms transforms);

    public abstract TrieNode assign(int shift,
                                       int index,
                                       T value,
                                       MutableDelta sizeDelta);

    public abstract  TrieNode assign(int shift,
                                              int index,
                                              K key,
                                              V value,
                                              Transforms transforms,
                                              MutableDelta sizeDelta);

    public abstract TrieNode delete(int shift,
                                       int index,
                                       MutableDelta sizeDelta);

    public abstract  TrieNode delete(int shift,
                                              int index,
                                              K key,
                                              Transforms transforms,
                                              MutableDelta sizeDelta);

    public abstract int getShift();

    public abstract boolean isLeaf();

    public TrieNode trimmedToMinimumDepth()
    {
        return this;
    }

    public TrieNode paddedToMinimumDepthForShift(int shift)
    {
        TrieNode node = this;
        int nodeShift = node.getShift();
        while (nodeShift < shift) {
            nodeShift += 5;
            node = SingleBranchTrieNode.forBranchIndex(nodeShift, 0, node);
        }
        return node;
    }

    public Cursor> signedOrderEntryCursor()
    {
        return anyOrderEntryCursor();
    }

    public  Cursor> signedOrderEntryCursor(Transforms transforms)
    {
        return anyOrderEntryCursor(transforms);
    }

    public abstract Cursor> anyOrderEntryCursor();

    public abstract  Cursor> anyOrderEntryCursor(Transforms transforms);

    public Cursor signedOrderValueCursor()
    {
        return anyOrderValueCursor();
    }

    public abstract Cursor anyOrderValueCursor();

    public static  TrieNode of()
    {
        return EmptyTrieNode.instance();
    }

    public static  TrieNode fromSource(int index,
                                             Indexed source,
                                             int offset,
                                             int limit)
    {
        final int size = Math.min(32, limit - offset);
        if (size < 0) {
            throw new IllegalArgumentException();
        }

        switch (size) {
        case 0:
            return of();

        case 1:
            return LeafTrieNode.of(index, source.get(offset));

        case 32:
            return FullBranchTrieNode.fromSource(index, source, offset);

        default:
            return MultiBranchTrieNode.forSource(index, size, source, offset);
        }
    }

    public static int shiftForIndex(int index)
    {
        switch (Integer.numberOfLeadingZeros(index)) {
        case 0:
        case 1:
            return 30;

        case 2:
        case 3:
        case 4:
        case 5:
        case 6:
            return 25;

        case 7:
        case 8:
        case 9:
        case 10:
        case 11:
            return 20;

        case 12:
        case 13:
        case 14:
        case 15:
        case 16:
            return 15;

        case 17:
        case 18:
        case 19:
        case 20:
        case 21:
            return 10;

        case 22:
        case 23:
        case 24:
        case 25:
        case 26:
            return 5;

        case 27:
        case 28:
        case 29:
        case 30:
        case 31:
        case 32:
            return 0;
        }
        throw new IllegalArgumentException();
    }
}