/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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.
*
* The initial idea for this class is from "org.apache.commons.lang.IntHashMap";
* http://commons.apache.org/commons-lang-2.6-src.zip
*
*/
package scouter.util;
import java.util.Enumeration;
import java.util.NoSuchElementException;
/**
* @author Paul Kim (sjkim@whatap.io)
*/
public class LongKeyMap<V> {
private static final int DEFAULT_CAPACITY = 101;
private static final float DEFAULT_LOAD_FACTOR = 0.75f;
private LongKeyEntry<V> table[];
private int count;
private int threshold;
private float loadFactor;
public LongKeyMap(int initCapacity, float loadFactor) {
if (initCapacity < 0)
throw new RuntimeException("Capacity Error: " + initCapacity);
if (loadFactor <= 0)
throw new RuntimeException("Load Count Error: " + loadFactor);
if (initCapacity == 0)
initCapacity = 1;
this.loadFactor = loadFactor;
table = new LongKeyEntry[initCapacity];
threshold = (int) (initCapacity * loadFactor);
}
public LongKeyMap() {
this(DEFAULT_CAPACITY, DEFAULT_LOAD_FACTOR);
}
public int size() {
return count;
}
public synchronized long[] keyArray() {
long[] _keys = new long[this.size()];
LongEnumer en = this.keys();
for (int i = 0; i < _keys.length; i++)
_keys[i] = en.nextLong();
return _keys;
}
public synchronized LongEnumer keys() {
return new Enumer(TYPE.KEYS);
}
public synchronized Enumeration<V> values() {
return new Enumer(TYPE.VALUES);
}
public synchronized Enumeration<LongKeyEntry<V>> entries() {
return new Enumer(TYPE.ENTRIES);
}
public synchronized boolean containsValue(V value) {
if (value == null) {
return false;
}
LongKeyEntry tab[] = table;
int i = tab.length;
while (i-- > 0) {
for (LongKeyEntry e = tab[i]; e != null; e = e.next) {
if (CompareUtil.equals(e.value, value)) {
return true;
}
}
}
return false;
}
public synchronized boolean containsKey(long key) {
LongKeyEntry tab[] = table;
int index = hash(key) % tab.length;
for (LongKeyEntry e = tab[index]; e != null; e = e.next) {
if (e.key == key) {
return true;
}
}
return false;
}
public synchronized V get(long key) {
LongKeyEntry<V> tab[] = table;
int index = hash(key) % tab.length;
for (LongKeyEntry e = tab[index]; e != null; e = e.next) {
if (e.key == key) {
return (V) e.value;
}
}
return null;
}
private int hash(long key) {
return (int) (key ^ (key >>> 32)) & Integer.MAX_VALUE;
}
protected void rehash() {
int oldCapacity = table.length;
LongKeyEntry oldMap[] = table;
int newCapacity = oldCapacity * 2 + 1;
LongKeyEntry newMap[] = new LongKeyEntry[newCapacity];
threshold = (int) (newCapacity * loadFactor);
table = newMap;
for (int i = oldCapacity; i-- > 0;) {
LongKeyEntry old = oldMap[i];
while (old != null) {
LongKeyEntry e = old;
old = old.next;
long key = e.key;
int index = hash(key) % newCapacity;
e.next = newMap[index];
newMap[index] = e;
}
}
}
public synchronized V put(long key, V value) {
LongKeyEntry<V> tab[] = table;
int index = hash(key) % tab.length;
for (LongKeyEntry<V> e = tab[index]; e != null; e = e.next) {
if (e.key == key) {
V old = e.value;
e.value = value;
return old;
}
}
if (count >= threshold) {
rehash();
tab = table;
index = hash(key) % tab.length;
}
LongKeyEntry e = new LongKeyEntry(key, value, tab[index]);
tab[index] = e;
count++;
return null;
}
public synchronized Object remove(long key) {
LongKeyEntry tab[] = table;
int index = hash(key) % tab.length;
for (LongKeyEntry e = tab[index], prev = null; e != null; prev = e, e = e.next) {
if (e.key == key) {
if (prev != null) {
prev.next = e.next;
} else {
tab[index] = e.next;
}
count--;
Object oldValue = e.value;
e.value = null;
return oldValue;
}
}
return null;
}
public synchronized void clear() {
LongKeyEntry tab[] = table;
for (int index = tab.length; --index >= 0;)
tab[index] = null;
count = 0;
}
public String toString() {
StringBuffer buf = new StringBuffer();
Enumeration it = entries();
buf.append("{");
for (int i = 0; it.hasMoreElements(); i++) {
LongKeyEntry e = (LongKeyEntry) (it.nextElement());
if (i > 0)
buf.append(", ");
buf.append(e.getKey() + "=" + e.getValue());
}
buf.append("}");
return buf.toString();
}
public String toFormatString() {
StringBuffer buf = new StringBuffer();
Enumeration it = entries();
buf.append("{\n");
while (it.hasMoreElements()) {
LongKeyEntry e = (LongKeyEntry) it.nextElement();
buf.append("\t").append(e.getKey() + "=" + e.getValue()).append("\n");
}
buf.append("}");
return buf.toString();
}
private enum TYPE {
KEYS, VALUES, ENTRIES
}
private class Enumer implements Enumeration, LongEnumer {
LongKeyEntry[] table = LongKeyMap.this.table;
int index = table.length;
LongKeyEntry entry = null;
LongKeyEntry lastReturned = null;
TYPE type;
Enumer(TYPE type) {
this.type = type;
}
public boolean hasMoreElements() {
while (entry == null && index > 0)
entry = table[--index];
return entry != null;
}
public Object nextElement() {
while (entry == null && index > 0)
entry = table[--index];
if (entry != null) {
LongKeyEntry e = lastReturned = entry;
entry = e.next;
switch (type) {
case KEYS:
return e.key;
case VALUES:
return e.value;
default:
return e;
}
}
throw new NoSuchElementException("no more next");
}
public long nextLong() {
while (entry == null && index > 0)
entry = table[--index];
if (entry != null) {
LongKeyEntry e = lastReturned = entry;
entry = e.next;
return e.key;
}
throw new NoSuchElementException("no more next");
}
}
public static class LongKeyEntry<V> {
long key;
V value;
LongKeyEntry<V> next;
protected LongKeyEntry(long key, V value, LongKeyEntry<V> next) {
this.key = key;
this.value = value;
this.next = next;
}
protected Object clone() {
return new LongKeyEntry<V>(key, value, (next == null ? null : (LongKeyEntry) next.clone()));
}
public long getKey() {
return key;
}
public Object getValue() {
return value;
}
public V setValue(V value) {
if (value == null)
throw new NullPointerException();
V oldValue = this.value;
this.value = value;
return oldValue;
}
public boolean equals(Object o) {
if (!(o instanceof LongKeyEntry))
return false;
LongKeyEntry<V> e = (LongKeyEntry<V>) o;
return CompareUtil.equals(e.key, key) && CompareUtil.equals(e.value, value);
}
public int hashCode() {
return (int) (key ^ (key >>> 32)) ^ (value == null ? 0 : value.hashCode());
}
public String toString() {
return key + "=" + value.toString();
}
}
}