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/* Copyright (C) 1991-2016 Free Software Foundation, Inc.
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You should have received a copy of the GNU Lesser General Public
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/* We do not support C11 . */
/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*
* Copyright (C) 2002-2016 Sebastiano Vigna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package it.unimi.dsi.fastutil.shorts;
import it.unimi.dsi.fastutil.objects.AbstractObjectSortedSet;
import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;
import it.unimi.dsi.fastutil.objects.ObjectListIterator;
import it.unimi.dsi.fastutil.objects.ObjectSortedSet;
import it.unimi.dsi.fastutil.objects.ObjectCollection;
import it.unimi.dsi.fastutil.objects.AbstractObjectCollection;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Map;
import java.util.SortedMap;
import java.util.NoSuchElementException;
/**
* A type-specific AVL tree map with a fast, small-footprint implementation.
*
*
* The iterators provided by the views of this class are type-specific
* {@linkplain it.unimi.dsi.fastutil.BidirectionalIterator bidirectional
* iterators}. Moreover, the iterator returned by iterator() can be
* safely cast to a type-specific {@linkplain java.util.ListIterator list
* iterator}.
*/
public class Short2ObjectAVLTreeMap extends AbstractShort2ObjectSortedMap implements java.io.Serializable, Cloneable {
/** A reference to the root entry. */
protected transient Entry tree;
/** Number of entries in this map. */
protected int count;
/** The first key in this map. */
protected transient Entry firstEntry;
/** The last key in this map. */
protected transient Entry lastEntry;
/** Cached set of entries. */
protected transient ObjectSortedSet> entries;
/** Cached set of keys. */
protected transient ShortSortedSet keys;
/** Cached collection of values. */
protected transient ObjectCollection values;
/**
* The value of this variable remembers, after a put() or a
* remove(), whether the domain of the map has been
* modified.
*/
protected transient boolean modified;
/** This map's comparator, as provided in the constructor. */
protected Comparator storedComparator;
/**
* This map's actual comparator; it may differ from
* {@link #storedComparator} because it is always a type-specific
* comparator, so it could be derived from the former by wrapping.
*/
protected transient ShortComparator actualComparator;
private static final long serialVersionUID = -7046029254386353129L;
private static final boolean ASSERTS = false;
{
allocatePaths();
}
/**
* Creates a new empty tree map.
*/
public Short2ObjectAVLTreeMap() {
tree = null;
count = 0;
}
/**
* Generates the comparator that will be actually used.
*
*
* When a specific {@link Comparator} is specified and stored in
* {@link #storedComparator}, we must check whether it is type-specific. If
* it is so, we can used directly, and we store it in
* {@link #actualComparator}. Otherwise, we generate on-the-fly an anonymous
* class that wraps the non-specific {@link Comparator} and makes it into a
* type-specific one.
*/
private void setActualComparator() {
/*
* If the provided comparator is already type-specific, we use it.
* Otherwise, we use a wrapper anonymous class to fake that it is
* type-specific.
*/
if (storedComparator == null || storedComparator instanceof ShortComparator) actualComparator = (ShortComparator) storedComparator;
else actualComparator = new ShortComparator() {
public int compare(short k1, short k2) {
return storedComparator.compare((Short.valueOf(k1)), (Short.valueOf(k2)));
}
public int compare(Short ok1, Short ok2) {
return storedComparator.compare(ok1, ok2);
}
};
}
/**
* Creates a new empty tree map with the given comparator.
*
* @param c
* a (possibly type-specific) comparator.
*/
public Short2ObjectAVLTreeMap(final Comparator c) {
this();
storedComparator = c;
setActualComparator();
}
/**
* Creates a new tree map copying a given map.
*
* @param m
* a {@link Map} to be copied into the new tree map.
*/
public Short2ObjectAVLTreeMap(final Map m) {
this();
putAll(m);
}
/**
* Creates a new tree map copying a given sorted map (and its
* {@link Comparator}).
*
* @param m
* a {@link SortedMap} to be copied into the new tree map.
*/
public Short2ObjectAVLTreeMap(final SortedMap m) {
this(m.comparator());
putAll(m);
}
/**
* Creates a new tree map copying a given map.
*
* @param m
* a type-specific map to be copied into the new tree map.
*/
public Short2ObjectAVLTreeMap(final Short2ObjectMap m) {
this();
putAll(m);
}
/**
* Creates a new tree map copying a given sorted map (and its
* {@link Comparator}).
*
* @param m
* a type-specific sorted map to be copied into the new tree map.
*/
public Short2ObjectAVLTreeMap(final Short2ObjectSortedMap m) {
this(m.comparator());
putAll(m);
}
/**
* Creates a new tree map using the elements of two parallel arrays and the
* given comparator.
*
* @param k
* the array of keys of the new tree map.
* @param v
* the array of corresponding values in the new tree map.
* @param c
* a (possibly type-specific) comparator.
* @throws IllegalArgumentException
* if k and v have different lengths.
*/
public Short2ObjectAVLTreeMap(final short[] k, final V v[], final Comparator c) {
this(c);
if (k.length != v.length) throw new IllegalArgumentException("The key array and the value array have different lengths (" + k.length + " and " + v.length + ")");
for (int i = 0; i < k.length; i++)
this.put(k[i], v[i]);
}
/**
* Creates a new tree map using the elements of two parallel arrays.
*
* @param k
* the array of keys of the new tree map.
* @param v
* the array of corresponding values in the new tree map.
* @throws IllegalArgumentException
* if k and v have different lengths.
*/
public Short2ObjectAVLTreeMap(final short[] k, final V v[]) {
this(k, v, null);
}
/*
* The following methods implements some basic building blocks used by all
* accessors. They are (and should be maintained) identical to those used in
* AVLTreeSet.drv.
*
* The put()/remove() code is derived from Ben Pfaff's GNU libavl
* (http://www.msu.edu/~pfaffben/avl/). If you want to understand what's
* going on, you should have a look at the literate code contained therein
* first.
*/
/**
* Compares two keys in the right way.
*
*
* This method uses the {@link #actualComparator} if it is
* non-null. Otherwise, it resorts to primitive type
* comparisons or to {@link Comparable#compareTo(Object) compareTo()}.
*
* @param k1
* the first key.
* @param k2
* the second key.
* @return a number smaller than, equal to or greater than 0, as usual
* (i.e., when k1 < k2, k1 = k2 or k1 > k2, respectively).
*/
final int compare(final short k1, final short k2) {
return actualComparator == null ? (Short.compare((k1), (k2))) : actualComparator.compare(k1, k2);
}
/**
* Returns the entry corresponding to the given key, if it is in the tree;
* null, otherwise.
*
* @param k
* the key to search for.
* @return the corresponding entry, or null if no entry with
* the given key exists.
*/
final Entry findKey(final short k) {
Entry e = tree;
int cmp;
while (e != null && (cmp = compare(k, e.key)) != 0)
e = cmp < 0 ? e.left() : e.right();
return e;
}
/**
* Locates a key.
*
* @param k
* a key.
* @return the last entry on a search for the given key; this will be the
* given key, if it present; otherwise, it will be either the
* smallest greater key or the greatest smaller key.
*/
final Entry locateKey(final short k) {
Entry e = tree, last = tree;
int cmp = 0;
while (e != null && (cmp = compare(k, e.key)) != 0) {
last = e;
e = cmp < 0 ? e.left() : e.right();
}
return cmp == 0 ? e : last;
}
/**
* This vector remembers the directions followed during the current
* insertion. It suffices for about 232 entries.
*/
private transient boolean dirPath[];
private void allocatePaths() {
dirPath = new boolean[48];
}
public V put(final short k, final V v) {
Entry e = add(k);
final V oldValue = e.value;
e.value = v;
return oldValue;
}
/**
* Returns a node with key k in the balanced tree, creating one with
* defRetValue if necessary.
*
* @param k
* the key
* @return a node with key k. If a node with key k already exists, then that
* node is returned, otherwise a new node with defRetValue is
* created ensuring that the tree is balanced after creation of the
* node.
*/
private Entry add(final short k) {
/*
* After execution of this method, modified is true iff a new entry has
* been inserted.
*/
modified = false;
Entry e = null;
if (tree == null) { // The case of the empty tree is treated separately.
count++;
e = tree = lastEntry = firstEntry = new Entry(k, defRetValue);
modified = true;
} else {
Entry p = tree, q = null, y = tree, z = null, w = null;
int cmp, i = 0;
while (true) {
if ((cmp = compare(k, p.key)) == 0) {
return p;
}
if (p.balance() != 0) {
i = 0;
z = q;
y = p;
}
if (dirPath[i++] = cmp > 0) {
if (p.succ()) {
count++;
e = new Entry(k, defRetValue);
modified = true;
if (p.right == null) lastEntry = e;
e.left = p;
e.right = p.right;
p.right(e);
break;
}
q = p;
p = p.right;
} else {
if (p.pred()) {
count++;
e = new Entry(k, defRetValue);
modified = true;
if (p.left == null) firstEntry = e;
e.right = p;
e.left = p.left;
p.left(e);
break;
}
q = p;
p = p.left;
}
}
p = y;
i = 0;
while (p != e) {
if (dirPath[i]) p.incBalance();
else p.decBalance();
p = dirPath[i++] ? p.right : p.left;
}
if (y.balance() == -2) {
Entry x = y.left;
if (x.balance() == -1) {
w = x;
if (x.succ()) {
x.succ(false);
y.pred(x);
} else y.left = x.right;
x.right = y;
x.balance(0);
y.balance(0);
} else {
if (ASSERTS) assert x.balance() == 1;
w = x.right;
x.right = w.left;
w.left = x;
y.left = w.right;
w.right = y;
if (w.balance() == -1) {
x.balance(0);
y.balance(1);
} else if (w.balance() == 0) {
x.balance(0);
y.balance(0);
} else {
x.balance(-1);
y.balance(0);
}
w.balance(0);
if (w.pred()) {
x.succ(w);
w.pred(false);
}
if (w.succ()) {
y.pred(w);
w.succ(false);
}
}
} else if (y.balance() == +2) {
Entry x = y.right;
if (x.balance() == 1) {
w = x;
if (x.pred()) {
x.pred(false);
y.succ(x);
} else y.right = x.left;
x.left = y;
x.balance(0);
y.balance(0);
} else {
if (ASSERTS) assert x.balance() == -1;
w = x.left;
x.left = w.right;
w.right = x;
y.right = w.left;
w.left = y;
if (w.balance() == 1) {
x.balance(0);
y.balance(-1);
} else if (w.balance() == 0) {
x.balance(0);
y.balance(0);
} else {
x.balance(1);
y.balance(0);
}
w.balance(0);
if (w.pred()) {
y.succ(w);
w.pred(false);
}
if (w.succ()) {
x.pred(w);
w.succ(false);
}
}
} else return e;
if (z == null) tree = w;
else {
if (z.left == y) z.left = w;
else z.right = w;
}
}
if (ASSERTS) checkTree(tree);
return e;
}
/**
* Finds the parent of an entry.
*
* @param e
* a node of the tree.
* @return the parent of the given node, or null for the root.
*/
private Entry parent(final Entry e) {
if (e == tree) return null;
Entry x, y, p;
x = y = e;
while (true) {
if (y.succ()) {
p = y.right;
if (p == null || p.left != e) {
while (!x.pred())
x = x.left;
p = x.left;
}
return p;
} else if (x.pred()) {
p = x.left;
if (p == null || p.right != e) {
while (!y.succ())
y = y.right;
p = y.right;
}
return p;
}
x = x.left;
y = y.right;
}
}
/*
* After execution of this method, {@link #modified} is true iff an entry
* has been deleted.
*/
public V remove(final short k) {
modified = false;
if (tree == null) return defRetValue;
int cmp;
Entry p = tree, q = null;
boolean dir = false;
final short kk = k;
while (true) {
if ((cmp = compare(kk, p.key)) == 0) break;
else if (dir = cmp > 0) {
q = p;
if ((p = p.right()) == null) return defRetValue;
} else {
q = p;
if ((p = p.left()) == null) return defRetValue;
}
}
if (p.left == null) firstEntry = p.next();
if (p.right == null) lastEntry = p.prev();
if (p.succ()) {
if (p.pred()) {
if (q != null) {
if (dir) q.succ(p.right);
else q.pred(p.left);
} else tree = dir ? p.right : p.left;
} else {
p.prev().right = p.right;
if (q != null) {
if (dir) q.right = p.left;
else q.left = p.left;
} else tree = p.left;
}
} else {
Entry r = p.right;
if (r.pred()) {
r.left = p.left;
r.pred(p.pred());
if (!r.pred()) r.prev().right = r;
if (q != null) {
if (dir) q.right = r;
else q.left = r;
} else tree = r;
r.balance(p.balance());
q = r;
dir = true;
} else {
Entry s;
while (true) {
s = r.left;
if (s.pred()) break;
r = s;
}
if (s.succ()) r.pred(s);
else r.left = s.right;
s.left = p.left;
if (!p.pred()) {
p.prev().right = s;
s.pred(false);
}
s.right = p.right;
s.succ(false);
if (q != null) {
if (dir) q.right = s;
else q.left = s;
} else tree = s;
s.balance(p.balance());
q = r;
dir = false;
}
}
Entry y;
while (q != null) {
y = q;
q = parent(y);
if (!dir) {
dir = q != null && q.left != y;
y.incBalance();
if (y.balance() == 1) break;
else if (y.balance() == 2) {
Entry x = y.right;
if (ASSERTS) assert x != null;
if (x.balance() == -1) {
Entry w;
if (ASSERTS) assert x.balance() == -1;
w = x.left;
x.left = w.right;
w.right = x;
y.right = w.left;
w.left = y;
if (w.balance() == 1) {
x.balance(0);
y.balance(-1);
} else if (w.balance() == 0) {
x.balance(0);
y.balance(0);
} else {
if (ASSERTS) assert w.balance() == -1;
x.balance(1);
y.balance(0);
}
w.balance(0);
if (w.pred()) {
y.succ(w);
w.pred(false);
}
if (w.succ()) {
x.pred(w);
w.succ(false);
}
if (q != null) {
if (dir) q.right = w;
else q.left = w;
} else tree = w;
} else {
if (q != null) {
if (dir) q.right = x;
else q.left = x;
} else tree = x;
if (x.balance() == 0) {
y.right = x.left;
x.left = y;
x.balance(-1);
y.balance(+1);
break;
}
if (ASSERTS) assert x.balance() == 1;
if (x.pred()) {
y.succ(true);
x.pred(false);
} else y.right = x.left;
x.left = y;
y.balance(0);
x.balance(0);
}
}
} else {
dir = q != null && q.left != y;
y.decBalance();
if (y.balance() == -1) break;
else if (y.balance() == -2) {
Entry x = y.left;
if (ASSERTS) assert x != null;
if (x.balance() == 1) {
Entry w;
if (ASSERTS) assert x.balance() == 1;
w = x.right;
x.right = w.left;
w.left = x;
y.left = w.right;
w.right = y;
if (w.balance() == -1) {
x.balance(0);
y.balance(1);
} else if (w.balance() == 0) {
x.balance(0);
y.balance(0);
} else {
if (ASSERTS) assert w.balance() == 1;
x.balance(-1);
y.balance(0);
}
w.balance(0);
if (w.pred()) {
x.succ(w);
w.pred(false);
}
if (w.succ()) {
y.pred(w);
w.succ(false);
}
if (q != null) {
if (dir) q.right = w;
else q.left = w;
} else tree = w;
} else {
if (q != null) {
if (dir) q.right = x;
else q.left = x;
} else tree = x;
if (x.balance() == 0) {
y.left = x.right;
x.right = y;
x.balance(+1);
y.balance(-1);
break;
}
if (ASSERTS) assert x.balance() == -1;
if (x.succ()) {
y.pred(true);
x.succ(false);
} else y.left = x.right;
x.right = y;
y.balance(0);
x.balance(0);
}
}
}
}
modified = true;
count--;
if (ASSERTS) checkTree(tree);
return p.value;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public V put(final Short ok, final V ov) {
final V oldValue = put(((ok).shortValue()), (ov));
return modified ? (this.defRetValue) : (oldValue);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public V remove(final Object ok) {
final V oldValue = remove(((((Short) (ok)).shortValue())));
return modified ? (oldValue) : (this.defRetValue);
}
public boolean containsValue(final Object v) {
final ValueIterator i = new ValueIterator();
V ev;
int j = count;
while (j-- != 0) {
ev = i.next();
if (((ev) == null ? (v) == null : (ev).equals(v))) return true;
}
return false;
}
public void clear() {
count = 0;
tree = null;
entries = null;
values = null;
keys = null;
firstEntry = lastEntry = null;
}
/**
* This class represent an entry in a tree map.
*
*
* We use the only "metadata", i.e., {@link Entry#info}, to store
* information about balance, predecessor status and successor status.
*
*
* Note that since the class is recursive, it can be considered equivalently
* a tree.
*/
private static final class Entry implements Cloneable, Short2ObjectMap.Entry {
/**
* If the bit in this mask is true, {@link #right} points to a
* successor.
*/
private final static int SUCC_MASK = 1 << 31;
/**
* If the bit in this mask is true, {@link #left} points to a
* predecessor.
*/
private final static int PRED_MASK = 1 << 30;
/**
* The bits in this mask hold the node balance info. You can get it just
* by casting to byte.
*/
private final static int BALANCE_MASK = 0xFF;
/** The key of this entry. */
short key;
/** The value of this entry. */
V value;
/** The pointers to the left and right subtrees. */
Entry left, right;
/**
* This integers holds different information in different bits (see
* {@link #SUCC_MASK}, {@link #PRED_MASK} and {@link #BALANCE_MASK}).
*/
int info;
Entry() {
}
/**
* Creates a new entry with the given key and value.
*
* @param k
* a key.
* @param v
* a value.
*/
Entry(final short k, final V v) {
this.key = k;
this.value = v;
info = SUCC_MASK | PRED_MASK;
}
/**
* Returns the left subtree.
*
* @return the left subtree (null if the left subtree is
* empty).
*/
Entry left() {
return (info & PRED_MASK) != 0 ? null : left;
}
/**
* Returns the right subtree.
*
* @return the right subtree (null if the right subtree is
* empty).
*/
Entry right() {
return (info & SUCC_MASK) != 0 ? null : right;
}
/**
* Checks whether the left pointer is really a predecessor.
*
* @return true if the left pointer is a predecessor.
*/
boolean pred() {
return (info & PRED_MASK) != 0;
}
/**
* Checks whether the right pointer is really a successor.
*
* @return true if the right pointer is a successor.
*/
boolean succ() {
return (info & SUCC_MASK) != 0;
}
/**
* Sets whether the left pointer is really a predecessor.
*
* @param pred
* if true then the left pointer will be considered a
* predecessor.
*/
void pred(final boolean pred) {
if (pred) info |= PRED_MASK;
else info &= ~PRED_MASK;
}
/**
* Sets whether the right pointer is really a successor.
*
* @param succ
* if true then the right pointer will be considered a
* successor.
*/
void succ(final boolean succ) {
if (succ) info |= SUCC_MASK;
else info &= ~SUCC_MASK;
}
/**
* Sets the left pointer to a predecessor.
*
* @param pred
* the predecessr.
*/
void pred(final Entry pred) {
info |= PRED_MASK;
left = pred;
}
/**
* Sets the right pointer to a successor.
*
* @param succ
* the successor.
*/
void succ(final Entry succ) {
info |= SUCC_MASK;
right = succ;
}
/**
* Sets the left pointer to the given subtree.
*
* @param left
* the new left subtree.
*/
void left(final Entry left) {
info &= ~PRED_MASK;
this.left = left;
}
/**
* Sets the right pointer to the given subtree.
*
* @param right
* the new right subtree.
*/
void right(final Entry right) {
info &= ~SUCC_MASK;
this.right = right;
}
/**
* Returns the current level of the node.
*
* @return the current level of this node.
*/
int balance() {
return (byte) info;
}
/**
* Sets the level of this node.
*
* @param level
* the new level of this node.
*/
void balance(int level) {
info &= ~BALANCE_MASK;
info |= (level & BALANCE_MASK);
}
/** Increments the level of this node. */
void incBalance() {
info = info & ~BALANCE_MASK | ((byte) info + 1) & 0xFF;
}
/** Decrements the level of this node. */
protected void decBalance() {
info = info & ~BALANCE_MASK | ((byte) info - 1) & 0xFF;
}
/**
* Computes the next entry in the set order.
*
* @return the next entry (null) if this is the last
* entry).
*/
Entry next() {
Entry next = this.right;
if ((info & SUCC_MASK) == 0) while ((next.info & PRED_MASK) == 0)
next = next.left;
return next;
}
/**
* Computes the previous entry in the set order.
*
* @return the previous entry (null) if this is the first
* entry).
*/
Entry prev() {
Entry prev = this.left;
if ((info & PRED_MASK) == 0) while ((prev.info & SUCC_MASK) == 0)
prev = prev.right;
return prev;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method
* instead.
*/
@Deprecated
public Short getKey() {
return (Short.valueOf(key));
}
public short getShortKey() {
return key;
}
public V getValue() {
return (value);
}
public V setValue(final V value) {
final V oldValue = this.value;
this.value = value;
return oldValue;
}
@SuppressWarnings("unchecked")
public Entry clone() {
Entry c;
try {
c = (Entry) super.clone();
} catch (CloneNotSupportedException cantHappen) {
throw new InternalError();
}
c.key = key;
c.value = value;
c.info = info;
return c;
}
@SuppressWarnings("unchecked")
public boolean equals(final Object o) {
if (!(o instanceof Map.Entry)) return false;
Map.Entry e = (Map.Entry) o;
return ((key) == (((e.getKey()).shortValue()))) && ((value) == null ? ((e.getValue())) == null : (value).equals((e.getValue())));
}
public int hashCode() {
return (key) ^ ((value) == null ? 0 : (value).hashCode());
}
public String toString() {
return key + "=>" + value;
}
/*
* public void prettyPrint() { prettyPrint(0); }
*
* public void prettyPrint(int level) { if ( pred() ) { for (int i = 0;
* i < level; i++) System.err.print(" "); System.err.println("pred: " +
* left ); } else if (left != null) left.prettyPrint(level +1 ); for
* (int i = 0; i < level; i++) System.err.print(" ");
* System.err.println(key + "=" + value + " (" + balance() + ")"); if (
* succ() ) { for (int i = 0; i < level; i++) System.err.print(" ");
* System.err.println("succ: " + right ); } else if (right != null)
* right.prettyPrint(level + 1); }
*/
}
/*
* public void prettyPrint() { System.err.println("size: " + count); if
* (tree != null) tree.prettyPrint(); }
*/
public boolean containsKey(final short k) {
return findKey(k) != null;
}
public int size() {
return count;
}
public boolean isEmpty() {
return count == 0;
}
public V get(final short k) {
final Entry e = findKey(k);
return e == null ? defRetValue : e.value;
}
public short firstShortKey() {
if (tree == null) throw new NoSuchElementException();
return firstEntry.key;
}
public short lastShortKey() {
if (tree == null) throw new NoSuchElementException();
return lastEntry.key;
}
/**
* An abstract iterator on the whole range.
*
*
* This class can iterate in both directions on a threaded tree.
*/
private class TreeIterator {
/**
* The entry that will be returned by the next call to
* {@link java.util.ListIterator#previous()} (or null if no
* previous entry exists).
*/
Entry prev;
/**
* The entry that will be returned by the next call to
* {@link java.util.ListIterator#next()} (or null if no
* next entry exists).
*/
Entry next;
/**
* The last entry that was returned (or null if we did not
* iterate or used {@link #remove()}).
*/
Entry curr;
/**
* The current index (in the sense of a {@link java.util.ListIterator}).
* Note that this value is not meaningful when this {@link TreeIterator}
* has been created using the nonempty constructor.
*/
int index = 0;
TreeIterator() {
next = firstEntry;
}
TreeIterator(final short k) {
if ((next = locateKey(k)) != null) {
if (compare(next.key, k) <= 0) {
prev = next;
next = next.next();
} else prev = next.prev();
}
}
public boolean hasNext() {
return next != null;
}
public boolean hasPrevious() {
return prev != null;
}
void updateNext() {
next = next.next();
}
Entry nextEntry() {
if (!hasNext()) throw new NoSuchElementException();
curr = prev = next;
index++;
updateNext();
return curr;
}
void updatePrevious() {
prev = prev.prev();
}
Entry previousEntry() {
if (!hasPrevious()) throw new NoSuchElementException();
curr = next = prev;
index--;
updatePrevious();
return curr;
}
public int nextIndex() {
return index;
}
public int previousIndex() {
return index - 1;
}
public void remove() {
if (curr == null) throw new IllegalStateException();
/*
* If the last operation was a next(), we are removing an entry that
* preceeds the current index, and thus we must decrement it.
*/
if (curr == prev) index--;
next = prev = curr;
updatePrevious();
updateNext();
Short2ObjectAVLTreeMap.this.remove(curr.key);
curr = null;
}
public int skip(final int n) {
int i = n;
while (i-- != 0 && hasNext())
nextEntry();
return n - i - 1;
}
public int back(final int n) {
int i = n;
while (i-- != 0 && hasPrevious())
previousEntry();
return n - i - 1;
}
}
/**
* An iterator on the whole range.
*
*
* This class can iterate in both directions on a threaded tree.
*/
private class EntryIterator extends TreeIterator implements ObjectListIterator> {
EntryIterator() {
}
EntryIterator(final short k) {
super(k);
}
public Short2ObjectMap.Entry next() {
return nextEntry();
}
public Short2ObjectMap.Entry previous() {
return previousEntry();
}
public void set(Short2ObjectMap.Entry ok) {
throw new UnsupportedOperationException();
}
public void add(Short2ObjectMap.Entry ok) {
throw new UnsupportedOperationException();
}
}
public ObjectSortedSet> short2ObjectEntrySet() {
if (entries == null) entries = new AbstractObjectSortedSet>() {
final Comparator> comparator = new Comparator>() {
public int compare(final Short2ObjectMap.Entry x, final Short2ObjectMap.Entry y) {
return Short2ObjectAVLTreeMap.this.actualComparator.compare(x.getShortKey(), y.getShortKey());
}
};
public Comparator> comparator() {
return comparator;
}
public ObjectBidirectionalIterator> iterator() {
return new EntryIterator();
}
public ObjectBidirectionalIterator> iterator(final Short2ObjectMap.Entry from) {
return new EntryIterator(from.getShortKey());
}
public boolean contains(final Object o) {
if (!(o instanceof Map.Entry)) return false;
final Map.Entry e = (Map.Entry) o;
if (e.getKey() == null || !(e.getKey() instanceof Short)) return false;
final Entry f = findKey(((((Short) (e.getKey())).shortValue())));
return e.equals(f);
}
public boolean remove(final Object o) {
if (!(o instanceof Map.Entry)) return false;
final Map.Entry e = (Map.Entry) o;
if (e.getKey() == null || !(e.getKey() instanceof Short)) return false;
final Entry f = findKey(((((Short) (e.getKey())).shortValue())));
if (f != null) Short2ObjectAVLTreeMap.this.remove(f.key);
return f != null;
}
public int size() {
return count;
}
public void clear() {
Short2ObjectAVLTreeMap.this.clear();
}
public Short2ObjectMap.Entry first() {
return firstEntry;
}
public Short2ObjectMap.Entry last() {
return lastEntry;
}
public ObjectSortedSet> subSet(Short2ObjectMap.Entry from, Short2ObjectMap.Entry to) {
return subMap(from.getShortKey(), to.getShortKey()).short2ObjectEntrySet();
}
public ObjectSortedSet> headSet(Short2ObjectMap.Entry to) {
return headMap(to.getShortKey()).short2ObjectEntrySet();
}
public ObjectSortedSet> tailSet(Short2ObjectMap.Entry from) {
return tailMap(from.getShortKey()).short2ObjectEntrySet();
}
};
return entries;
}
/**
* An iterator on the whole range of keys.
*
*
* This class can iterate in both directions on the keys of a threaded tree.
* We simply override the
* {@link java.util.ListIterator#next()}/{@link java.util.ListIterator#previous()}
* methods (and possibly their type-specific counterparts) so that they
* return keys instead of entries.
*/
private final class KeyIterator extends TreeIterator implements ShortListIterator {
public KeyIterator() {
}
public KeyIterator(final short k) {
super(k);
}
public short nextShort() {
return nextEntry().key;
}
public short previousShort() {
return previousEntry().key;
}
public void set(short k) {
throw new UnsupportedOperationException();
}
public void add(short k) {
throw new UnsupportedOperationException();
}
public Short next() {
return (Short.valueOf(nextEntry().key));
}
public Short previous() {
return (Short.valueOf(previousEntry().key));
}
public void set(Short ok) {
throw new UnsupportedOperationException();
}
public void add(Short ok) {
throw new UnsupportedOperationException();
}
};
/**
* A keyset implementation using a more direct implementation for iterators.
*/
private class KeySet extends AbstractShort2ObjectSortedMap.KeySet {
public ShortBidirectionalIterator iterator() {
return new KeyIterator();
}
public ShortBidirectionalIterator iterator(final short from) {
return new KeyIterator(from);
}
}
/**
* Returns a type-specific sorted set view of the keys contained in this
* map.
*
*
* In addition to the semantics of {@link java.util.Map#keySet()}, you can
* safely cast the set returned by this call to a type-specific sorted set
* interface.
*
* @return a type-specific sorted set view of the keys contained in this
* map.
*/
public ShortSortedSet keySet() {
if (keys == null) keys = new KeySet();
return keys;
}
/**
* An iterator on the whole range of values.
*
*
* This class can iterate in both directions on the values of a threaded
* tree. We simply override the
* {@link java.util.ListIterator#next()}/{@link java.util.ListIterator#previous()}
* methods (and possibly their type-specific counterparts) so that they
* return values instead of entries.
*/
private final class ValueIterator extends TreeIterator implements ObjectListIterator {
public V next() {
return nextEntry().value;
}
public V previous() {
return previousEntry().value;
}
public void set(V v) {
throw new UnsupportedOperationException();
}
public void add(V v) {
throw new UnsupportedOperationException();
}
};
/**
* Returns a type-specific collection view of the values contained in this
* map.
*
*
* In addition to the semantics of {@link java.util.Map#values()}, you can
* safely cast the collection returned by this call to a type-specific
* collection interface.
*
* @return a type-specific collection view of the values contained in this
* map.
*/
public ObjectCollection values() {
if (values == null) values = new AbstractObjectCollection() {
public ObjectIterator iterator() {
return new ValueIterator();
}
public boolean contains(final Object k) {
return containsValue(k);
}
public int size() {
return count;
}
public void clear() {
Short2ObjectAVLTreeMap.this.clear();
}
};
return values;
}
public ShortComparator comparator() {
return actualComparator;
}
public Short2ObjectSortedMap headMap(short to) {
return new Submap(((short) 0), true, to, false);
}
public Short2ObjectSortedMap tailMap(short from) {
return new Submap(from, false, ((short) 0), true);
}
public Short2ObjectSortedMap subMap(short from, short to) {
return new Submap(from, false, to, false);
}
/**
* A submap with given range.
*
*
* This class represents a submap. One has to specify the left/right limits
* (which can be set to -∞ or ∞). Since the submap is a view on
* the map, at a given moment it could happen that the limits of the range
* are not any longer in the main map. Thus, things such as
* {@link java.util.SortedMap#firstKey()} or
* {@link java.util.Collection#size()} must be always computed on-the-fly.
*/
private final class Submap extends AbstractShort2ObjectSortedMap implements java.io.Serializable {
private static final long serialVersionUID = -7046029254386353129L;
/** The start of the submap range, unless {@link #bottom} is true. */
short from;
/** The end of the submap range, unless {@link #top} is true. */
short to;
/** If true, the submap range starts from -∞. */
boolean bottom;
/** If true, the submap range goes to ∞. */
boolean top;
/** Cached set of entries. */
@SuppressWarnings("hiding")
protected transient ObjectSortedSet> entries;
/** Cached set of keys. */
@SuppressWarnings("hiding")
protected transient ShortSortedSet keys;
/** Cached collection of values. */
@SuppressWarnings("hiding")
protected transient ObjectCollection values;
/**
* Creates a new submap with given key range.
*
* @param from
* the start of the submap range.
* @param bottom
* if true, the first parameter is ignored and the range
* starts from -∞.
* @param to
* the end of the submap range.
* @param top
* if true, the third parameter is ignored and the range goes
* to ∞.
*/
public Submap(final short from, final boolean bottom, final short to, final boolean top) {
if (!bottom && !top && Short2ObjectAVLTreeMap.this.compare(from, to) > 0) throw new IllegalArgumentException("Start key (" + from + ") is larger than end key (" + to + ")");
this.from = from;
this.bottom = bottom;
this.to = to;
this.top = top;
this.defRetValue = Short2ObjectAVLTreeMap.this.defRetValue;
}
public void clear() {
final SubmapIterator i = new SubmapIterator();
while (i.hasNext()) {
i.nextEntry();
i.remove();
}
}
/**
* Checks whether a key is in the submap range.
*
* @param k
* a key.
* @return true if is the key is in the submap range.
*/
final boolean in(final short k) {
return (bottom || Short2ObjectAVLTreeMap.this.compare(k, from) >= 0) && (top || Short2ObjectAVLTreeMap.this.compare(k, to) < 0);
}
public ObjectSortedSet> short2ObjectEntrySet() {
if (entries == null) entries = new AbstractObjectSortedSet>() {
public ObjectBidirectionalIterator> iterator() {
return new SubmapEntryIterator();
}
public ObjectBidirectionalIterator> iterator(final Short2ObjectMap.Entry from) {
return new SubmapEntryIterator(from.getShortKey());
}
public Comparator> comparator() {
return Short2ObjectAVLTreeMap.this.entrySet().comparator();
}
public boolean contains(final Object o) {
if (!(o instanceof Map.Entry)) return false;
final Map.Entry e = (Map.Entry) o;
if (e.getKey() == null || !(e.getKey() instanceof Short)) return false;
final Short2ObjectAVLTreeMap.Entry f = findKey(((((Short) (e.getKey())).shortValue())));
return f != null && in(f.key) && e.equals(f);
}
public boolean remove(final Object o) {
if (!(o instanceof Map.Entry)) return false;
final Map.Entry e = (Map.Entry) o;
if (e.getKey() == null || !(e.getKey() instanceof Short)) return false;
final Short2ObjectAVLTreeMap.Entry f = findKey(((((Short) (e.getKey())).shortValue())));
if (f != null && in(f.key)) Submap.this.remove(f.key);
return f != null;
}
public int size() {
int c = 0;
for (Iterator i = iterator(); i.hasNext(); i.next())
c++;
return c;
}
public boolean isEmpty() {
return !new SubmapIterator().hasNext();
}
public void clear() {
Submap.this.clear();
}
public Short2ObjectMap.Entry first() {
return firstEntry();
}
public Short2ObjectMap.Entry last() {
return lastEntry();
}
public ObjectSortedSet> subSet(Short2ObjectMap.Entry from, Short2ObjectMap.Entry to) {
return subMap(from.getShortKey(), to.getShortKey()).short2ObjectEntrySet();
}
public ObjectSortedSet> headSet(Short2ObjectMap.Entry to) {
return headMap(to.getShortKey()).short2ObjectEntrySet();
}
public ObjectSortedSet> tailSet(Short2ObjectMap.Entry from) {
return tailMap(from.getShortKey()).short2ObjectEntrySet();
}
};
return entries;
}
private class KeySet extends AbstractShort2ObjectSortedMap.KeySet {
public ShortBidirectionalIterator iterator() {
return new SubmapKeyIterator();
}
public ShortBidirectionalIterator iterator(final short from) {
return new SubmapKeyIterator(from);
}
}
public ShortSortedSet keySet() {
if (keys == null) keys = new KeySet();
return keys;
}
public ObjectCollection values() {
if (values == null) values = new AbstractObjectCollection() {
public ObjectIterator iterator() {
return new SubmapValueIterator();
}
public boolean contains(final Object k) {
return containsValue(k);
}
public int size() {
return Submap.this.size();
}
public void clear() {
Submap.this.clear();
}
};
return values;
}
public boolean containsKey(final short k) {
return in(k) && Short2ObjectAVLTreeMap.this.containsKey(k);
}
public boolean containsValue(final Object v) {
final SubmapIterator i = new SubmapIterator();
Object ev;
while (i.hasNext()) {
ev = i.nextEntry().value;
if (((ev) == null ? (v) == null : (ev).equals(v))) return true;
}
return false;
}
public V get(final short k) {
final Short2ObjectAVLTreeMap.Entry e;
final short kk = k;
return in(kk) && (e = findKey(kk)) != null ? e.value : this.defRetValue;
}
public V put(final short k, final V v) {
modified = false;
if (!in(k)) throw new IllegalArgumentException("Key (" + k + ") out of range [" + (bottom ? "-" : String.valueOf(from)) + ", " + (top ? "-" : String.valueOf(to)) + ")");
final V oldValue = Short2ObjectAVLTreeMap.this.put(k, v);
return modified ? this.defRetValue : oldValue;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method
* instead.
*/
@Deprecated
@Override
public V put(final Short ok, final V ov) {
final V oldValue = put(((ok).shortValue()), (ov));
return modified ? (this.defRetValue) : (oldValue);
}
public V remove(final short k) {
modified = false;
if (!in(k)) return this.defRetValue;
final V oldValue = Short2ObjectAVLTreeMap.this.remove(k);
return modified ? oldValue : this.defRetValue;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method
* instead.
*/
@Deprecated
@Override
public V remove(final Object ok) {
final V oldValue = remove(((((Short) (ok)).shortValue())));
return modified ? (oldValue) : (this.defRetValue);
}
public int size() {
final SubmapIterator i = new SubmapIterator();
int n = 0;
while (i.hasNext()) {
n++;
i.nextEntry();
}
return n;
}
public boolean isEmpty() {
return !new SubmapIterator().hasNext();
}
public ShortComparator comparator() {
return actualComparator;
}
public Short2ObjectSortedMap headMap(final short to) {
if (top) return new Submap(from, bottom, to, false);
return compare(to, this.to) < 0 ? new Submap(from, bottom, to, false) : this;
}
public Short2ObjectSortedMap tailMap(final short from) {
if (bottom) return new Submap(from, false, to, top);
return compare(from, this.from) > 0 ? new Submap(from, false, to, top) : this;
}
public Short2ObjectSortedMap subMap(short from, short to) {
if (top && bottom) return new Submap(from, false, to, false);
if (!top) to = compare(to, this.to) < 0 ? to : this.to;
if (!bottom) from = compare(from, this.from) > 0 ? from : this.from;
if (!top && !bottom && from == this.from && to == this.to) return this;
return new Submap(from, false, to, false);
}
/**
* Locates the first entry.
*
* @return the first entry of this submap, or null if the
* submap is empty.
*/
public Short2ObjectAVLTreeMap.Entry firstEntry() {
if (tree == null) return null;
// If this submap goes to -infinity, we return the main map first
// entry; otherwise, we locate the start of the map.
Short2ObjectAVLTreeMap.Entry e;
if (bottom) e = firstEntry;
else {
e = locateKey(from);
// If we find either the start or something greater we're OK.
if (compare(e.key, from) < 0) e = e.next();
}
// Finally, if this subset doesn't go to infinity, we check that the
// resulting key isn't greater than the end.
if (e == null || !top && compare(e.key, to) >= 0) return null;
return e;
}
/**
* Locates the last entry.
*
* @return the last entry of this submap, or null if the
* submap is empty.
*/
public Short2ObjectAVLTreeMap.Entry lastEntry() {
if (tree == null) return null;
// If this submap goes to infinity, we return the main map last
// entry; otherwise, we locate the end of the map.
Short2ObjectAVLTreeMap.Entry e;
if (top) e = lastEntry;
else {
e = locateKey(to);
// If we find something smaller than the end we're OK.
if (compare(e.key, to) >= 0) e = e.prev();
}
// Finally, if this subset doesn't go to -infinity, we check that
// the resulting key isn't smaller than the start.
if (e == null || !bottom && compare(e.key, from) < 0) return null;
return e;
}
public short firstShortKey() {
Short2ObjectAVLTreeMap.Entry e = firstEntry();
if (e == null) throw new NoSuchElementException();
return e.key;
}
public short lastShortKey() {
Short2ObjectAVLTreeMap.Entry e = lastEntry();
if (e == null) throw new NoSuchElementException();
return e.key;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method
* instead.
*/
@Deprecated
@Override
public Short firstKey() {
Short2ObjectAVLTreeMap.Entry e = firstEntry();
if (e == null) throw new NoSuchElementException();
return e.getKey();
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method
* instead.
*/
@Deprecated
@Override
public Short lastKey() {
Short2ObjectAVLTreeMap.Entry e = lastEntry();
if (e == null) throw new NoSuchElementException();
return e.getKey();
}
/**
* An iterator for subranges.
*
*
* This class inherits from {@link TreeIterator}, but overrides the
* methods that update the pointer after a
* {@link java.util.ListIterator#next()} or
* {@link java.util.ListIterator#previous()}. If we would move out of
* the range of the submap we just overwrite the next or previous entry
* with null.
*/
private class SubmapIterator extends TreeIterator {
SubmapIterator() {
next = firstEntry();
}
SubmapIterator(final short k) {
this();
if (next != null) {
if (!bottom && compare(k, next.key) < 0) prev = null;
else if (!top && compare(k, (prev = lastEntry()).key) >= 0) next = null;
else {
next = locateKey(k);
if (compare(next.key, k) <= 0) {
prev = next;
next = next.next();
} else prev = next.prev();
}
}
}
void updatePrevious() {
prev = prev.prev();
if (!bottom && prev != null && Short2ObjectAVLTreeMap.this.compare(prev.key, from) < 0) prev = null;
}
void updateNext() {
next = next.next();
if (!top && next != null && Short2ObjectAVLTreeMap.this.compare(next.key, to) >= 0) next = null;
}
}
private class SubmapEntryIterator extends SubmapIterator implements ObjectListIterator> {
SubmapEntryIterator() {
}
SubmapEntryIterator(final short k) {
super(k);
}
public Short2ObjectMap.Entry next() {
return nextEntry();
}
public Short2ObjectMap.Entry previous() {
return previousEntry();
}
public void set(Short2ObjectMap.Entry ok) {
throw new UnsupportedOperationException();
}
public void add(Short2ObjectMap.Entry ok) {
throw new UnsupportedOperationException();
}
}
/**
* An iterator on a subrange of keys.
*
*
* This class can iterate in both directions on a subrange of the keys
* of a threaded tree. We simply override the
* {@link java.util.ListIterator#next()}/{@link java.util.ListIterator#previous()}
* methods (and possibly their type-specific counterparts) so that they
* return keys instead of entries.
*/
private final class SubmapKeyIterator extends SubmapIterator implements ShortListIterator {
public SubmapKeyIterator() {
super();
}
public SubmapKeyIterator(short from) {
super(from);
}
public short nextShort() {
return nextEntry().key;
}
public short previousShort() {
return previousEntry().key;
}
public void set(short k) {
throw new UnsupportedOperationException();
}
public void add(short k) {
throw new UnsupportedOperationException();
}
public Short next() {
return (Short.valueOf(nextEntry().key));
}
public Short previous() {
return (Short.valueOf(previousEntry().key));
}
public void set(Short ok) {
throw new UnsupportedOperationException();
}
public void add(Short ok) {
throw new UnsupportedOperationException();
}
};
/**
* An iterator on a subrange of values.
*
*
* This class can iterate in both directions on the values of a subrange
* of the keys of a threaded tree. We simply override the
* {@link java.util.ListIterator#next()}/{@link java.util.ListIterator#previous()}
* methods (and possibly their type-specific counterparts) so that they
* return values instead of entries.
*/
private final class SubmapValueIterator extends SubmapIterator implements ObjectListIterator {
public V next() {
return nextEntry().value;
}
public V previous() {
return previousEntry().value;
}
public void set(V v) {
throw new UnsupportedOperationException();
}
public void add(V v) {
throw new UnsupportedOperationException();
}
};
}
/**
* Returns a deep copy of this tree map.
*
*
* This method performs a deep copy of this tree map; the data stored in the
* set, however, is not cloned. Note that this makes a difference only for
* object keys.
*
* @return a deep copy of this tree map.
*/
@SuppressWarnings("unchecked")
public Short2ObjectAVLTreeMap clone() {
Short2ObjectAVLTreeMap c;
try {
c = (Short2ObjectAVLTreeMap) super.clone();
} catch (CloneNotSupportedException cantHappen) {
throw new InternalError();
}
c.keys = null;
c.values = null;
c.entries = null;
c.allocatePaths();
if (count != 0) {
// Also this apparently unfathomable code is derived from GNU
// libavl.
Entry e, p, q, rp = new Entry(), rq = new Entry();
p = rp;
rp.left(tree);
q = rq;
rq.pred(null);
while (true) {
if (!p.pred()) {
e = p.left.clone();
e.pred(q.left);
e.succ(q);
q.left(e);
p = p.left;
q = q.left;
} else {
while (p.succ()) {
p = p.right;
if (p == null) {
q.right = null;
c.tree = rq.left;
c.firstEntry = c.tree;
while (c.firstEntry.left != null)
c.firstEntry = c.firstEntry.left;
c.lastEntry = c.tree;
while (c.lastEntry.right != null)
c.lastEntry = c.lastEntry.right;
return c;
}
q = q.right;
}
p = p.right;
q = q.right;
}
if (!p.succ()) {
e = p.right.clone();
e.succ(q.right);
e.pred(q);
q.right(e);
}
}
}
return c;
}
private void writeObject(java.io.ObjectOutputStream s) throws java.io.IOException {
int n = count;
EntryIterator i = new EntryIterator();
Entry e;
s.defaultWriteObject();
while (n-- != 0) {
e = i.nextEntry();
s.writeShort(e.key);
s.writeObject(e.value);
}
}
/**
* Reads the given number of entries from the input stream, returning the
* corresponding tree.
*
* @param s
* the input stream.
* @param n
* the (positive) number of entries to read.
* @param pred
* the entry containing the key that preceeds the first key in
* the tree.
* @param succ
* the entry containing the key that follows the last key in the
* tree.
*/
@SuppressWarnings("unchecked")
private Entry readTree(final java.io.ObjectInputStream s, final int n, final Entry pred, final Entry succ) throws java.io.IOException, ClassNotFoundException {
if (n == 1) {
final Entry top = new Entry(s.readShort(), (V) s.readObject());
top.pred(pred);
top.succ(succ);
return top;
}
if (n == 2) {
/*
* We handle separately this case so that recursion will always* be
* on nonempty subtrees.
*/
final Entry top = new Entry(s.readShort(), (V) s.readObject());
top.right(new Entry(s.readShort(), (V) s.readObject()));
top.right.pred(top);
top.balance(1);
top.pred(pred);
top.right.succ(succ);
return top;
}
// The right subtree is the largest one.
final int rightN = n / 2, leftN = n - rightN - 1;
final Entry top = new Entry();
top.left(readTree(s, leftN, pred, top));
top.key = s.readShort();
top.value = (V) s.readObject();
top.right(readTree(s, rightN, top, succ));
if (n == (n & -n)) top.balance(1); // Quick test for determining whether
// n is a power of 2.
return top;
}
private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException {
s.defaultReadObject();
/*
* The storedComparator is now correctly set, but we must restore
* on-the-fly the actualComparator.
*/
setActualComparator();
allocatePaths();
if (count != 0) {
tree = readTree(s, count, null, null);
Entry e;
e = tree;
while (e.left() != null)
e = e.left();
firstEntry = e;
e = tree;
while (e.right() != null)
e = e.right();
lastEntry = e;
}
if (ASSERTS) checkTree(tree);
}
private static int checkTree(@SuppressWarnings("unused") Entry e) {
return 0;
}
}