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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.
//
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// 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
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package org.javimmutable.collections.array.trie32;
import org.javimmutable.collections.Cursor;
import org.javimmutable.collections.Func1;
import org.javimmutable.collections.Holder;
import org.javimmutable.collections.Indexed;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.common.MutableDelta;
import org.javimmutable.collections.cursors.MultiTransformCursor;
import org.javimmutable.collections.cursors.StandardCursor;
import javax.annotation.concurrent.Immutable;
@Immutable
public class FullBranchTrieNode
extends TrieNode
{
private final int shift;
private final TrieNode[] entries;
FullBranchTrieNode(int shift,
TrieNode[] entries)
{
this.shift = shift;
this.entries = entries;
}
static FullBranchTrieNode fromSource(int index,
Indexed source,
int offset)
{
assert source.size() - offset >= 32;
TrieNode[] entries = MultiBranchTrieNode.allocate(32);
for (int i = 0; i < 32; ++i) {
entries[i] = LeafTrieNode.of(index++, source.get(offset++));
}
return new FullBranchTrieNode(0, entries);
}
@Override
public boolean isEmpty()
{
return false;
}
@Override
public T getValueOr(int shift,
int index,
T defaultValue)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
return entries[childIndex].getValueOr(shift - 5, index, defaultValue);
}
@Override
public V getValueOr(int shift,
int index,
K key,
Transforms transforms,
V defaultValue)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
return entries[childIndex].getValueOr(shift - 5, index, key, transforms, defaultValue);
}
@Override
public Holder find(int shift,
int index)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
return entries[childIndex].find(shift - 5, index);
}
@Override
public Holder find(int shift,
int index,
K key,
Transforms transforms)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
return entries[childIndex].find(shift - 5, index, key, transforms);
}
@Override
public TrieNode assign(int shift,
int index,
T value,
MutableDelta sizeDelta)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
final TrieNode child = entries[childIndex];
final TrieNode newChild = child.assign(shift - 5, index, value, sizeDelta);
if (newChild == child) {
return this;
} else {
return createUpdatedEntries(shift, childIndex, newChild);
}
}
@Override
public TrieNode assign(int shift,
int index,
K key,
V value,
Transforms transforms,
MutableDelta sizeDelta)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
final TrieNode child = entries[childIndex];
final TrieNode newChild = child.assign(shift - 5, index, key, value, transforms, sizeDelta);
if (newChild == child) {
return this;
} else {
return createUpdatedEntries(shift, childIndex, newChild);
}
}
@Override
public TrieNode delete(int shift,
int index,
MutableDelta sizeDelta)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
final TrieNode child = entries[childIndex];
final TrieNode newChild = child.delete(shift - 5, index, sizeDelta);
if (newChild == child) {
return this;
} else if (newChild.isEmpty()) {
return MultiBranchTrieNode.fullWithout(shift, entries, childIndex);
} else {
return createUpdatedEntries(shift, childIndex, newChild);
}
}
@Override
public TrieNode delete(int shift,
int index,
K key,
Transforms transforms,
MutableDelta sizeDelta)
{
assert this.shift == shift;
final int childIndex = (index >>> shift) & 0x1f;
final TrieNode child = entries[childIndex];
final TrieNode newChild = child.delete(shift - 5, index, key, transforms, sizeDelta);
if (newChild == child) {
return this;
} else if (newChild.isEmpty()) {
return MultiBranchTrieNode.fullWithout(shift, entries, childIndex);
} else {
return createUpdatedEntries(shift, childIndex, newChild);
}
}
@Override
public int getShift()
{
return shift;
}
@Override
public boolean isLeaf()
{
return false;
}
@Override
public Cursor> anyOrderEntryCursor()
{
return MultiTransformCursor.of(StandardCursor.of(new CursorSource()), new Func1, Cursor>>()
{
@Override
public Cursor> apply(TrieNode node)
{
return node.anyOrderEntryCursor();
}
});
}
@Override
public Cursor anyOrderValueCursor()
{
return MultiTransformCursor.of(StandardCursor.of(new CursorSource()), new Func1, Cursor>()
{
@Override
public Cursor apply(TrieNode node)
{
return node.anyOrderValueCursor();
}
});
}
@Override
public Cursor> anyOrderEntryCursor(final Transforms transforms)
{
return MultiTransformCursor.of(StandardCursor.of(new CursorSource()), new Func1, Cursor>>()
{
@Override
public Cursor> apply(TrieNode node)
{
return node.anyOrderEntryCursor(transforms);
}
});
}
private TrieNode createUpdatedEntries(int shift,
int childIndex,
TrieNode newChild)
{
assert newChild.isLeaf() || (newChild.getShift() == shift - 5);
TrieNode[] newEntries = entries.clone();
newEntries[childIndex] = newChild;
return new FullBranchTrieNode(shift, newEntries);
}
private class CursorSource
implements StandardCursor.Source>
{
private final int index;
private CursorSource()
{
this(0);
}
private CursorSource(int index)
{
this.index = index;
}
@Override
public boolean atEnd()
{
return index >= entries.length;
}
@Override
public TrieNode currentValue()
{
return entries[index];
}
@Override
public StandardCursor.Source> advance()
{
return atEnd() ? this : new CursorSource(index + 1);
}
}
}