882 lines
29 KiB
Java
882 lines
29 KiB
Java
/*******************************************************************************
|
|
* Copyright 2011 LibGDX.
|
|
* Mario Zechner <badlogicgames@gmail.com>
|
|
* Nathan Sweet <nathan.sweet@gmail.com>
|
|
*
|
|
* 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 dorkbox.collections;
|
|
|
|
import java.util.Iterator;
|
|
import java.util.NoSuchElementException;
|
|
import java.util.Random;
|
|
|
|
/** An unordered map that uses int keys. This implementation is a cuckoo hash map using 3 hashes, random walking, and a small
|
|
* stash for problematic keys. Null values are allowed. No allocation is done except when growing the table size. <br>
|
|
* <br>
|
|
* This map performs very fast get, containsKey, and remove (typically O(1), worst case O(log(n))). Put may be a bit slower,
|
|
* depending on hash collisions. Load factors greater than 0.91 greatly increase the chances the map will have to rehash to the
|
|
* next higher POT size.
|
|
* @author Nathan Sweet */
|
|
@SuppressWarnings({"unchecked", "rawtypes"})
|
|
public class IntMap<V> implements Iterable<IntMap.Entry<V>> {
|
|
private static final int PRIME1 = 0xbe1f14b1;
|
|
private static final int PRIME2 = 0xb4b82e39;
|
|
private static final int PRIME3 = 0xced1c241;
|
|
private static final int EMPTY = 0;
|
|
|
|
public int size;
|
|
|
|
int[] keyTable;
|
|
V[] valueTable;
|
|
int capacity, stashSize;
|
|
V zeroValue;
|
|
boolean hasZeroValue;
|
|
|
|
private float loadFactor;
|
|
private int hashShift, mask, threshold;
|
|
private int stashCapacity;
|
|
private int pushIterations;
|
|
|
|
private Entries entries1, entries2;
|
|
private Values values1, values2;
|
|
private Keys keys1, keys2;
|
|
|
|
/** Creates a new map with an initial capacity of 51 and a load factor of 0.8. */
|
|
public IntMap () {
|
|
this(51, 0.8f);
|
|
}
|
|
|
|
/** Creates a new map with a load factor of 0.8.
|
|
* @param initialCapacity If not a power of two, it is increased to the next nearest power of two. */
|
|
public IntMap (int initialCapacity) {
|
|
this(initialCapacity, 0.8f);
|
|
}
|
|
|
|
/** Creates a new map with the specified initial capacity and load factor. This map will hold initialCapacity items before
|
|
* growing the backing table.
|
|
* @param initialCapacity If not a power of two, it is increased to the next nearest power of two. */
|
|
public IntMap (int initialCapacity, float loadFactor) {
|
|
if (initialCapacity < 0) throw new IllegalArgumentException("initialCapacity must be >= 0: " + initialCapacity);
|
|
initialCapacity = MathUtil.nextPowerOfTwo((int)Math.ceil(initialCapacity / loadFactor));
|
|
if (initialCapacity > 1 << 30) throw new IllegalArgumentException("initialCapacity is too large: " + initialCapacity);
|
|
capacity = initialCapacity;
|
|
|
|
if (loadFactor <= 0) throw new IllegalArgumentException("loadFactor must be > 0: " + loadFactor);
|
|
this.loadFactor = loadFactor;
|
|
|
|
threshold = (int)(capacity * loadFactor);
|
|
mask = capacity - 1;
|
|
hashShift = 31 - Integer.numberOfTrailingZeros(capacity);
|
|
stashCapacity = Math.max(3, (int)Math.ceil(Math.log(capacity)) * 2);
|
|
pushIterations = Math.max(Math.min(capacity, 8), (int)Math.sqrt(capacity) / 8);
|
|
|
|
keyTable = new int[capacity + stashCapacity];
|
|
valueTable = (V[])new Object[keyTable.length];
|
|
}
|
|
|
|
/** Creates a new map identical to the specified map. */
|
|
public IntMap (IntMap<? extends V> map) {
|
|
this((int)Math.floor(map.capacity * map.loadFactor), map.loadFactor);
|
|
stashSize = map.stashSize;
|
|
System.arraycopy(map.keyTable, 0, keyTable, 0, map.keyTable.length);
|
|
System.arraycopy(map.valueTable, 0, valueTable, 0, map.valueTable.length);
|
|
size = map.size;
|
|
zeroValue = map.zeroValue;
|
|
hasZeroValue = map.hasZeroValue;
|
|
}
|
|
|
|
public V put (int key, V value) {
|
|
if (key == 0) {
|
|
V oldValue = zeroValue;
|
|
zeroValue = value;
|
|
if (!hasZeroValue) {
|
|
hasZeroValue = true;
|
|
size++;
|
|
}
|
|
return oldValue;
|
|
}
|
|
|
|
int[] keyTable = this.keyTable;
|
|
|
|
// Check for existing keys.
|
|
int index1 = key & mask;
|
|
int key1 = keyTable[index1];
|
|
if (key1 == key) {
|
|
V oldValue = valueTable[index1];
|
|
valueTable[index1] = value;
|
|
return oldValue;
|
|
}
|
|
|
|
int index2 = hash2(key);
|
|
int key2 = keyTable[index2];
|
|
if (key2 == key) {
|
|
V oldValue = valueTable[index2];
|
|
valueTable[index2] = value;
|
|
return oldValue;
|
|
}
|
|
|
|
int index3 = hash3(key);
|
|
int key3 = keyTable[index3];
|
|
if (key3 == key) {
|
|
V oldValue = valueTable[index3];
|
|
valueTable[index3] = value;
|
|
return oldValue;
|
|
}
|
|
|
|
// Update key in the stash.
|
|
for (int i = capacity, n = i + stashSize; i < n; i++) {
|
|
if (keyTable[i] == key) {
|
|
V oldValue = valueTable[i];
|
|
valueTable[i] = value;
|
|
return oldValue;
|
|
}
|
|
}
|
|
|
|
// Check for empty buckets.
|
|
if (key1 == EMPTY) {
|
|
keyTable[index1] = key;
|
|
valueTable[index1] = value;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return null;
|
|
}
|
|
|
|
if (key2 == EMPTY) {
|
|
keyTable[index2] = key;
|
|
valueTable[index2] = value;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return null;
|
|
}
|
|
|
|
if (key3 == EMPTY) {
|
|
keyTable[index3] = key;
|
|
valueTable[index3] = value;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return null;
|
|
}
|
|
|
|
push(key, value, index1, key1, index2, key2, index3, key3);
|
|
return null;
|
|
}
|
|
|
|
public void putAll (IntMap<? extends V> map) {
|
|
for (Entry<? extends V> entry : map.entries())
|
|
put(entry.key, entry.value);
|
|
}
|
|
|
|
/** Skips checks for existing keys. */
|
|
private void putResize (int key, V value) {
|
|
if (key == 0) {
|
|
zeroValue = value;
|
|
hasZeroValue = true;
|
|
return;
|
|
}
|
|
|
|
// Check for empty buckets.
|
|
int index1 = key & mask;
|
|
int key1 = keyTable[index1];
|
|
if (key1 == EMPTY) {
|
|
keyTable[index1] = key;
|
|
valueTable[index1] = value;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return;
|
|
}
|
|
|
|
int index2 = hash2(key);
|
|
int key2 = keyTable[index2];
|
|
if (key2 == EMPTY) {
|
|
keyTable[index2] = key;
|
|
valueTable[index2] = value;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return;
|
|
}
|
|
|
|
int index3 = hash3(key);
|
|
int key3 = keyTable[index3];
|
|
if (key3 == EMPTY) {
|
|
keyTable[index3] = key;
|
|
valueTable[index3] = value;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return;
|
|
}
|
|
|
|
push(key, value, index1, key1, index2, key2, index3, key3);
|
|
}
|
|
|
|
private void push (int insertKey, V insertValue, int index1, int key1, int index2, int key2, int index3, int key3) {
|
|
int[] keyTable = this.keyTable;
|
|
|
|
V[] valueTable = this.valueTable;
|
|
int mask = this.mask;
|
|
|
|
// Push keys until an empty bucket is found.
|
|
int evictedKey;
|
|
V evictedValue;
|
|
int i = 0, pushIterations = this.pushIterations;
|
|
do {
|
|
// Replace the key and value for one of the hashes.
|
|
switch (MathUtil.random.nextInt(2)) {
|
|
case 0:
|
|
evictedKey = key1;
|
|
evictedValue = valueTable[index1];
|
|
keyTable[index1] = insertKey;
|
|
valueTable[index1] = insertValue;
|
|
break;
|
|
case 1:
|
|
evictedKey = key2;
|
|
evictedValue = valueTable[index2];
|
|
keyTable[index2] = insertKey;
|
|
valueTable[index2] = insertValue;
|
|
break;
|
|
default:
|
|
evictedKey = key3;
|
|
evictedValue = valueTable[index3];
|
|
keyTable[index3] = insertKey;
|
|
valueTable[index3] = insertValue;
|
|
break;
|
|
}
|
|
|
|
// If the evicted key hashes to an empty bucket, put it there and stop.
|
|
index1 = evictedKey & mask;
|
|
key1 = keyTable[index1];
|
|
if (key1 == EMPTY) {
|
|
keyTable[index1] = evictedKey;
|
|
valueTable[index1] = evictedValue;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return;
|
|
}
|
|
|
|
index2 = hash2(evictedKey);
|
|
key2 = keyTable[index2];
|
|
if (key2 == EMPTY) {
|
|
keyTable[index2] = evictedKey;
|
|
valueTable[index2] = evictedValue;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return;
|
|
}
|
|
|
|
index3 = hash3(evictedKey);
|
|
key3 = keyTable[index3];
|
|
if (key3 == EMPTY) {
|
|
keyTable[index3] = evictedKey;
|
|
valueTable[index3] = evictedValue;
|
|
if (size++ >= threshold) resize(capacity << 1);
|
|
return;
|
|
}
|
|
|
|
if (++i == pushIterations) break;
|
|
|
|
insertKey = evictedKey;
|
|
insertValue = evictedValue;
|
|
} while (true);
|
|
|
|
putStash(evictedKey, evictedValue);
|
|
}
|
|
|
|
private void putStash (int key, V value) {
|
|
if (stashSize == stashCapacity) {
|
|
// Too many pushes occurred and the stash is full, increase the table size.
|
|
resize(capacity << 1);
|
|
putResize(key, value);
|
|
return;
|
|
}
|
|
// Store key in the stash.
|
|
int index = capacity + stashSize;
|
|
keyTable[index] = key;
|
|
valueTable[index] = value;
|
|
stashSize++;
|
|
size++;
|
|
}
|
|
|
|
public V get (int key) {
|
|
if (key == 0) {
|
|
if (!hasZeroValue) return null;
|
|
return zeroValue;
|
|
}
|
|
int index = key & mask;
|
|
if (keyTable[index] != key) {
|
|
index = hash2(key);
|
|
if (keyTable[index] != key) {
|
|
index = hash3(key);
|
|
if (keyTable[index] != key) return getStash(key, null);
|
|
}
|
|
}
|
|
return valueTable[index];
|
|
}
|
|
|
|
public V get (int key, V defaultValue) {
|
|
if (key == 0) {
|
|
if (!hasZeroValue) return defaultValue;
|
|
return zeroValue;
|
|
}
|
|
int index = key & mask;
|
|
if (keyTable[index] != key) {
|
|
index = hash2(key);
|
|
if (keyTable[index] != key) {
|
|
index = hash3(key);
|
|
if (keyTable[index] != key) return getStash(key, defaultValue);
|
|
}
|
|
}
|
|
return valueTable[index];
|
|
}
|
|
|
|
private V getStash (int key, V defaultValue) {
|
|
int[] keyTable = this.keyTable;
|
|
for (int i = capacity, n = i + stashSize; i < n; i++)
|
|
if (keyTable[i] == key) return valueTable[i];
|
|
return defaultValue;
|
|
}
|
|
|
|
public V remove (int key) {
|
|
if (key == 0) {
|
|
if (!hasZeroValue) return null;
|
|
V oldValue = zeroValue;
|
|
zeroValue = null;
|
|
hasZeroValue = false;
|
|
size--;
|
|
return oldValue;
|
|
}
|
|
|
|
int index = key & mask;
|
|
if (keyTable[index] == key) {
|
|
keyTable[index] = EMPTY;
|
|
V oldValue = valueTable[index];
|
|
valueTable[index] = null;
|
|
size--;
|
|
return oldValue;
|
|
}
|
|
|
|
index = hash2(key);
|
|
if (keyTable[index] == key) {
|
|
keyTable[index] = EMPTY;
|
|
V oldValue = valueTable[index];
|
|
valueTable[index] = null;
|
|
size--;
|
|
return oldValue;
|
|
}
|
|
|
|
index = hash3(key);
|
|
if (keyTable[index] == key) {
|
|
keyTable[index] = EMPTY;
|
|
V oldValue = valueTable[index];
|
|
valueTable[index] = null;
|
|
size--;
|
|
return oldValue;
|
|
}
|
|
|
|
return removeStash(key);
|
|
}
|
|
|
|
V removeStash (int key) {
|
|
int[] keyTable = this.keyTable;
|
|
for (int i = capacity, n = i + stashSize; i < n; i++) {
|
|
if (keyTable[i] == key) {
|
|
V oldValue = valueTable[i];
|
|
removeStashIndex(i);
|
|
size--;
|
|
return oldValue;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
void removeStashIndex (int index) {
|
|
// If the removed location was not last, move the last tuple to the removed location.
|
|
stashSize--;
|
|
int lastIndex = capacity + stashSize;
|
|
if (index < lastIndex) {
|
|
keyTable[index] = keyTable[lastIndex];
|
|
valueTable[index] = valueTable[lastIndex];
|
|
valueTable[lastIndex] = null;
|
|
} else
|
|
valueTable[index] = null;
|
|
}
|
|
|
|
/** Returns true if the map is empty. */
|
|
public boolean isEmpty () {
|
|
return size == 0;
|
|
}
|
|
|
|
/** Reduces the size of the backing arrays to be the specified capacity or less. If the capacity is already less, nothing is
|
|
* done. If the map contains more items than the specified capacity, the next highest power of two capacity is used instead. */
|
|
public void shrink (int maximumCapacity) {
|
|
if (maximumCapacity < 0) throw new IllegalArgumentException("maximumCapacity must be >= 0: " + maximumCapacity);
|
|
if (size > maximumCapacity) maximumCapacity = size;
|
|
if (capacity <= maximumCapacity) return;
|
|
maximumCapacity = MathUtil.nextPowerOfTwo(maximumCapacity);
|
|
resize(maximumCapacity);
|
|
}
|
|
|
|
/** Clears the map and reduces the size of the backing arrays to be the specified capacity if they are larger. */
|
|
public void clear (int maximumCapacity) {
|
|
if (capacity <= maximumCapacity) {
|
|
clear();
|
|
return;
|
|
}
|
|
zeroValue = null;
|
|
hasZeroValue = false;
|
|
size = 0;
|
|
resize(maximumCapacity);
|
|
}
|
|
|
|
public void clear () {
|
|
if (size == 0) return;
|
|
int[] keyTable = this.keyTable;
|
|
V[] valueTable = this.valueTable;
|
|
for (int i = capacity + stashSize; i-- > 0;) {
|
|
keyTable[i] = EMPTY;
|
|
valueTable[i] = null;
|
|
}
|
|
size = 0;
|
|
stashSize = 0;
|
|
zeroValue = null;
|
|
hasZeroValue = false;
|
|
}
|
|
|
|
/** Returns true if the specified value is in the map. Note this traverses the entire map and compares every value, which may
|
|
* be an expensive operation.
|
|
* @param identity If true, uses == to compare the specified value with values in the map. If false, uses
|
|
* {@link #equals(Object)}. */
|
|
public boolean containsValue (Object value, boolean identity) {
|
|
V[] valueTable = this.valueTable;
|
|
if (value == null) {
|
|
if (hasZeroValue && zeroValue == null) return true;
|
|
int[] keyTable = this.keyTable;
|
|
for (int i = capacity + stashSize; i-- > 0;)
|
|
if (keyTable[i] != EMPTY && valueTable[i] == null) return true;
|
|
} else if (identity) {
|
|
if (value == zeroValue) return true;
|
|
for (int i = capacity + stashSize; i-- > 0;)
|
|
if (valueTable[i] == value) return true;
|
|
} else {
|
|
if (hasZeroValue && value.equals(zeroValue)) return true;
|
|
for (int i = capacity + stashSize; i-- > 0;)
|
|
if (value.equals(valueTable[i])) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public boolean containsKey (int key) {
|
|
if (key == 0) return hasZeroValue;
|
|
int index = key & mask;
|
|
if (keyTable[index] != key) {
|
|
index = hash2(key);
|
|
if (keyTable[index] != key) {
|
|
index = hash3(key);
|
|
if (keyTable[index] != key) return containsKeyStash(key);
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private boolean containsKeyStash (int key) {
|
|
int[] keyTable = this.keyTable;
|
|
for (int i = capacity, n = i + stashSize; i < n; i++)
|
|
if (keyTable[i] == key) return true;
|
|
return false;
|
|
}
|
|
|
|
/** Returns the key for the specified value, or <tt>notFound</tt> if it is not in the map. Note this traverses the entire map
|
|
* and compares every value, which may be an expensive operation.
|
|
* @param identity If true, uses == to compare the specified value with values in the map. If false, uses
|
|
* {@link #equals(Object)}. */
|
|
public int findKey (Object value, boolean identity, int notFound) {
|
|
V[] valueTable = this.valueTable;
|
|
if (value == null) {
|
|
if (hasZeroValue && zeroValue == null) return 0;
|
|
int[] keyTable = this.keyTable;
|
|
for (int i = capacity + stashSize; i-- > 0;)
|
|
if (keyTable[i] != EMPTY && valueTable[i] == null) return keyTable[i];
|
|
} else if (identity) {
|
|
if (value == zeroValue) return 0;
|
|
for (int i = capacity + stashSize; i-- > 0;)
|
|
if (valueTable[i] == value) return keyTable[i];
|
|
} else {
|
|
if (hasZeroValue && value.equals(zeroValue)) return 0;
|
|
for (int i = capacity + stashSize; i-- > 0;)
|
|
if (value.equals(valueTable[i])) return keyTable[i];
|
|
}
|
|
return notFound;
|
|
}
|
|
|
|
/** Increases the size of the backing array to accommodate the specified number of additional items. Useful before adding many
|
|
* items to avoid multiple backing array resizes. */
|
|
public void ensureCapacity (int additionalCapacity) {
|
|
if (additionalCapacity < 0) throw new IllegalArgumentException("additionalCapacity must be >= 0: " + additionalCapacity);
|
|
int sizeNeeded = size + additionalCapacity;
|
|
if (sizeNeeded >= threshold) resize(MathUtil.nextPowerOfTwo((int)Math.ceil(sizeNeeded / loadFactor)));
|
|
}
|
|
|
|
private void resize (int newSize) {
|
|
int oldEndIndex = capacity + stashSize;
|
|
|
|
capacity = newSize;
|
|
threshold = (int)(newSize * loadFactor);
|
|
mask = newSize - 1;
|
|
hashShift = 31 - Integer.numberOfTrailingZeros(newSize);
|
|
stashCapacity = Math.max(3, (int)Math.ceil(Math.log(newSize)) * 2);
|
|
pushIterations = Math.max(Math.min(newSize, 8), (int)Math.sqrt(newSize) / 8);
|
|
|
|
int[] oldKeyTable = keyTable;
|
|
V[] oldValueTable = valueTable;
|
|
|
|
keyTable = new int[newSize + stashCapacity];
|
|
valueTable = (V[])new Object[newSize + stashCapacity];
|
|
|
|
int oldSize = size;
|
|
size = hasZeroValue ? 1 : 0;
|
|
stashSize = 0;
|
|
if (oldSize > 0) {
|
|
for (int i = 0; i < oldEndIndex; i++) {
|
|
int key = oldKeyTable[i];
|
|
if (key != EMPTY) putResize(key, oldValueTable[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
private int hash2 (int h) {
|
|
h *= PRIME2;
|
|
return (h ^ h >>> hashShift) & mask;
|
|
}
|
|
|
|
private int hash3 (int h) {
|
|
h *= PRIME3;
|
|
return (h ^ h >>> hashShift) & mask;
|
|
}
|
|
|
|
@Override
|
|
public int hashCode () {
|
|
int h = 0;
|
|
if (hasZeroValue && zeroValue != null) {
|
|
h += zeroValue.hashCode();
|
|
}
|
|
int[] keyTable = this.keyTable;
|
|
V[] valueTable = this.valueTable;
|
|
for (int i = 0, n = capacity + stashSize; i < n; i++) {
|
|
int key = keyTable[i];
|
|
if (key != EMPTY) {
|
|
h += key * 31;
|
|
|
|
V value = valueTable[i];
|
|
if (value != null) {
|
|
h += value.hashCode();
|
|
}
|
|
}
|
|
}
|
|
return h;
|
|
}
|
|
|
|
@Override
|
|
public boolean equals (Object obj) {
|
|
if (obj == this) return true;
|
|
if (!(obj instanceof IntMap)) return false;
|
|
IntMap<V> other = (IntMap)obj;
|
|
if (other.size != size) return false;
|
|
if (other.hasZeroValue != hasZeroValue) return false;
|
|
if (hasZeroValue) {
|
|
if (other.zeroValue == null) {
|
|
if (zeroValue != null) return false;
|
|
} else {
|
|
if (!other.zeroValue.equals(zeroValue)) return false;
|
|
}
|
|
}
|
|
int[] keyTable = this.keyTable;
|
|
V[] valueTable = this.valueTable;
|
|
for (int i = 0, n = capacity + stashSize; i < n; i++) {
|
|
int key = keyTable[i];
|
|
if (key != EMPTY) {
|
|
V value = valueTable[i];
|
|
if (value == null) {
|
|
if (!other.containsKey(key) || other.get(key) != null) return false;
|
|
} else {
|
|
if (!value.equals(other.get(key))) return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
@Override
|
|
public String toString () {
|
|
if (size == 0) return "[]";
|
|
StringBuilder buffer = new StringBuilder(32);
|
|
buffer.append('[');
|
|
int[] keyTable = this.keyTable;
|
|
V[] valueTable = this.valueTable;
|
|
int i = keyTable.length;
|
|
if (hasZeroValue) {
|
|
buffer.append("0=");
|
|
buffer.append(zeroValue);
|
|
} else {
|
|
while (i-- > 0) {
|
|
int key = keyTable[i];
|
|
if (key == EMPTY) continue;
|
|
buffer.append(key);
|
|
buffer.append('=');
|
|
buffer.append(valueTable[i]);
|
|
break;
|
|
}
|
|
}
|
|
while (i-- > 0) {
|
|
int key = keyTable[i];
|
|
if (key == EMPTY) continue;
|
|
buffer.append(", ");
|
|
buffer.append(key);
|
|
buffer.append('=');
|
|
buffer.append(valueTable[i]);
|
|
}
|
|
buffer.append(']');
|
|
return buffer.toString();
|
|
}
|
|
|
|
@Override
|
|
public Iterator<Entry<V>> iterator () {
|
|
return entries();
|
|
}
|
|
|
|
/** Returns an iterator for the entries in the map. Remove is supported. Note that the same iterator instance is returned each
|
|
* time this method is called. Use the {@link Entries} constructor for nested or multithreaded iteration. */
|
|
public Entries<V> entries () {
|
|
if (entries1 == null) {
|
|
entries1 = new Entries(this);
|
|
entries2 = new Entries(this);
|
|
}
|
|
if (!entries1.valid) {
|
|
entries1.reset();
|
|
entries1.valid = true;
|
|
entries2.valid = false;
|
|
return entries1;
|
|
}
|
|
entries2.reset();
|
|
entries2.valid = true;
|
|
entries1.valid = false;
|
|
return entries2;
|
|
}
|
|
|
|
/** Returns an iterator for the values in the map. Remove is supported. Note that the same iterator instance is returned each
|
|
* time this method is called. Use the {@link Entries} constructor for nested or multithreaded iteration. */
|
|
public Values<V> values () {
|
|
if (values1 == null) {
|
|
values1 = new Values(this);
|
|
values2 = new Values(this);
|
|
}
|
|
if (!values1.valid) {
|
|
values1.reset();
|
|
values1.valid = true;
|
|
values2.valid = false;
|
|
return values1;
|
|
}
|
|
values2.reset();
|
|
values2.valid = true;
|
|
values1.valid = false;
|
|
return values2;
|
|
}
|
|
|
|
/** Returns an iterator for the keys in the map. Remove is supported. Note that the same iterator instance is returned each
|
|
* time this method is called. Use the {@link Entries} constructor for nested or multithreaded iteration. */
|
|
public Keys keys () {
|
|
if (keys1 == null) {
|
|
keys1 = new Keys(this);
|
|
keys2 = new Keys(this);
|
|
}
|
|
if (!keys1.valid) {
|
|
keys1.reset();
|
|
keys1.valid = true;
|
|
keys2.valid = false;
|
|
return keys1;
|
|
}
|
|
keys2.reset();
|
|
keys2.valid = true;
|
|
keys1.valid = false;
|
|
return keys2;
|
|
}
|
|
|
|
static public class Entry<V> {
|
|
public int key;
|
|
public V value;
|
|
|
|
@Override
|
|
public String toString () {
|
|
return key + "=" + value;
|
|
}
|
|
}
|
|
|
|
static private class MapIterator<V> {
|
|
static final int INDEX_ILLEGAL = -2;
|
|
static final int INDEX_ZERO = -1;
|
|
|
|
public boolean hasNext;
|
|
|
|
final IntMap<V> map;
|
|
int nextIndex, currentIndex;
|
|
boolean valid = true;
|
|
|
|
public MapIterator (IntMap<V> map) {
|
|
this.map = map;
|
|
reset();
|
|
}
|
|
|
|
public void reset () {
|
|
currentIndex = INDEX_ILLEGAL;
|
|
nextIndex = INDEX_ZERO;
|
|
if (map.hasZeroValue)
|
|
hasNext = true;
|
|
else
|
|
findNextIndex();
|
|
}
|
|
|
|
void findNextIndex () {
|
|
hasNext = false;
|
|
int[] keyTable = map.keyTable;
|
|
for (int n = map.capacity + map.stashSize; ++nextIndex < n;) {
|
|
if (keyTable[nextIndex] != EMPTY) {
|
|
hasNext = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
public void remove () {
|
|
if (currentIndex == INDEX_ZERO && map.hasZeroValue) {
|
|
map.zeroValue = null;
|
|
map.hasZeroValue = false;
|
|
} else if (currentIndex < 0) {
|
|
throw new IllegalStateException("next must be called before remove.");
|
|
} else if (currentIndex >= map.capacity) {
|
|
map.removeStashIndex(currentIndex);
|
|
nextIndex = currentIndex - 1;
|
|
findNextIndex();
|
|
} else {
|
|
map.keyTable[currentIndex] = EMPTY;
|
|
map.valueTable[currentIndex] = null;
|
|
}
|
|
currentIndex = INDEX_ILLEGAL;
|
|
map.size--;
|
|
}
|
|
}
|
|
|
|
@SuppressWarnings("rawtypes")
|
|
static public class Entries<V> extends MapIterator<V> implements Iterable<Entry<V>>, Iterator<Entry<V>> {
|
|
private Entry<V> entry = new Entry();
|
|
|
|
public Entries (IntMap map) {
|
|
super(map);
|
|
}
|
|
|
|
/** Note the same entry instance is returned each time this method is called. */
|
|
@Override
|
|
public Entry<V> next () {
|
|
if (!hasNext) throw new NoSuchElementException();
|
|
if (!valid) throw new RuntimeException("#iterator() cannot be used nested.");
|
|
int[] keyTable = map.keyTable;
|
|
if (nextIndex == INDEX_ZERO) {
|
|
entry.key = 0;
|
|
entry.value = map.zeroValue;
|
|
} else {
|
|
entry.key = keyTable[nextIndex];
|
|
entry.value = map.valueTable[nextIndex];
|
|
}
|
|
currentIndex = nextIndex;
|
|
findNextIndex();
|
|
return entry;
|
|
}
|
|
|
|
@Override
|
|
public boolean hasNext () {
|
|
if (!valid) throw new RuntimeException("#iterator() cannot be used nested.");
|
|
return hasNext;
|
|
}
|
|
|
|
@Override
|
|
public Iterator<Entry<V>> iterator () {
|
|
return this;
|
|
}
|
|
|
|
@Override
|
|
public void remove () {
|
|
super.remove();
|
|
}
|
|
}
|
|
|
|
@SuppressWarnings("unchecked")
|
|
static public class Values<V> extends MapIterator<V> implements Iterable<V>, Iterator<V> {
|
|
public Values (IntMap<V> map) {
|
|
super(map);
|
|
}
|
|
|
|
@Override
|
|
public boolean hasNext () {
|
|
if (!valid) throw new RuntimeException("#iterator() cannot be used nested.");
|
|
return hasNext;
|
|
}
|
|
|
|
@Override
|
|
public V next () {
|
|
if (!hasNext) throw new NoSuchElementException();
|
|
if (!valid) throw new RuntimeException("#iterator() cannot be used nested.");
|
|
V value;
|
|
if (nextIndex == INDEX_ZERO)
|
|
value = map.zeroValue;
|
|
else
|
|
value = map.valueTable[nextIndex];
|
|
currentIndex = nextIndex;
|
|
findNextIndex();
|
|
return value;
|
|
}
|
|
|
|
@Override
|
|
public Iterator<V> iterator () {
|
|
return this;
|
|
}
|
|
|
|
/** Returns a new array containing the remaining values. */
|
|
public Array<V> toArray () {
|
|
Array array = new Array(true, map.size);
|
|
while (hasNext)
|
|
array.add(next());
|
|
return array;
|
|
}
|
|
|
|
@Override
|
|
public void remove () {
|
|
super.remove();
|
|
}
|
|
}
|
|
|
|
@SuppressWarnings("unchecked")
|
|
static public class Keys extends MapIterator {
|
|
@SuppressWarnings("rawtypes")
|
|
public Keys (IntMap map) {
|
|
super(map);
|
|
}
|
|
|
|
public int next () {
|
|
if (!hasNext) throw new NoSuchElementException();
|
|
if (!valid) throw new RuntimeException("#iterator() cannot be used nested.");
|
|
int key = nextIndex == INDEX_ZERO ? 0 : map.keyTable[nextIndex];
|
|
currentIndex = nextIndex;
|
|
findNextIndex();
|
|
return key;
|
|
}
|
|
|
|
/** Returns a new array containing the remaining keys. */
|
|
public IntArray toArray () {
|
|
IntArray array = new IntArray(true, map.size);
|
|
while (hasNext)
|
|
array.add(next());
|
|
return array;
|
|
}
|
|
}
|
|
}
|