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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) 2017, Burton Computer Corporation
// All rights reserved.
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//
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// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
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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.SplitableIterator;
import org.javimmutable.collections.common.MutableDelta;
import org.javimmutable.collections.cursors.LazyMultiCursor;
import org.javimmutable.collections.indexed.IndexedArray;
import org.javimmutable.collections.iterators.LazyMultiIterator;
import javax.annotation.concurrent.Immutable;
@Immutable
public class FullBranchTrieNode
extends TrieNode
{
private final int shift;
private final TrieNode[] entries;
FullBranchTrieNode(int shift,
TrieNode[] entries)
{
assert shift != ROOT_SHIFT;
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);
return createDeleteResultNode(shift, childIndex, child, 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);
return createDeleteResultNode(shift, childIndex, child, newChild);
}
@Override
public int getShift()
{
return shift;
}
@Override
public boolean isLeaf()
{
return false;
}
@Override
public Cursor> anyOrderEntryCursor()
{
return LazyMultiCursor.transformed(IndexedArray.retained(entries), node -> () -> node.anyOrderEntryCursor());
}
@Override
public Cursor> anyOrderEntryCursor(final Transforms transforms)
{
return LazyMultiCursor.transformed(IndexedArray.retained(entries), node -> () -> node.anyOrderEntryCursor(transforms));
}
@Override
public Cursor anyOrderValueCursor()
{
return LazyMultiCursor.transformed(IndexedArray.retained(entries), node -> () -> node.anyOrderValueCursor());
}
@Override
public SplitableIterator> anyOrderEntryIterator()
{
return LazyMultiIterator.transformed(IndexedArray.retained(entries), node -> () -> node.anyOrderEntryIterator());
}
@Override
public SplitableIterator> anyOrderEntryIterator(Transforms transforms)
{
return LazyMultiIterator.transformed(IndexedArray.retained(entries), node -> () -> node.anyOrderEntryIterator(transforms));
}
@Override
public SplitableIterator anyOrderValueIterator()
{
return LazyMultiIterator.transformed(IndexedArray.retained(entries), node -> () -> node.anyOrderValueIterator());
}
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 TrieNode createDeleteResultNode(int shift,
int childIndex,
TrieNode child,
TrieNode newChild)
{
if (newChild == child) {
return this;
} else if (newChild.isEmpty()) {
return MultiBranchTrieNode.fullWithout(shift, entries, childIndex);
} else {
return createUpdatedEntries(shift, childIndex, newChild);
}
}
}