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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.setting;
import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.StrUtil;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
/**
* 基于分组的Map
* 此对象方法线程安全
*
* @author looly
* @since 4.0.11
*/
public class GroupedMap extends LinkedHashMap> {
private static final long serialVersionUID = -7777365130776081931L;
private final ReentrantReadWriteLock cacheLock = new ReentrantReadWriteLock();
private final ReadLock readLock = cacheLock.readLock();
private final WriteLock writeLock = cacheLock.writeLock();
private int size = -1;
/**
* 获取分组对应的值，如果分组不存在或者值不存在则返回null
*
* @param group 分组
* @param key 键
* @return 值，如果分组不存在或者值不存在则返回null
*/
public String get(String group, String key) {
readLock.lock();
try {
LinkedHashMap map = this.get(StrUtil.nullToEmpty(group));
if (MapUtil.isNotEmpty(map)) {
return map.get(key);
}
} finally {
readLock.unlock();
}
return null;
}
@Override
public LinkedHashMap get(Object key) {
readLock.lock();
try {
return super.get(key);
} finally {
readLock.unlock();
}
}
/**
* 总的键值对数
*
* @return 总键值对数
*/
@Override
public int size() {
writeLock.lock();
try {
if (this.size < 0) {
this.size = 0;
for (LinkedHashMap value : this.values()) {
this.size += value.size();
}
}
} finally {
writeLock.unlock();
}
return this.size;
}
/**
* 将键值对加入到对应分组中
*
* @param group 分组
* @param key 键
* @param value 值
* @return 此key之前存在的值，如果没有返回null
*/
public String put(String group, String key, String value) {
group = StrUtil.nullToEmpty(group).trim();
writeLock.lock();
try {
final LinkedHashMap valueMap = this.computeIfAbsent(group, k -> new LinkedHashMap<>());
this.size = -1;
return valueMap.put(key, value);
} finally {
writeLock.unlock();
}
}
/**
* 加入多个键值对到某个分组下
*
* @param group 分组
* @param m 键值对
* @return this
*/
public GroupedMap putAll(String group, Map m) {
for (Entry entry : m.entrySet()) {
this.put(group, entry.getKey(), entry.getValue());
}
return this;
}
/**
* 从指定分组中删除指定值
*
* @param group 分组
* @param key 键
* @return 被删除的值，如果值不存在，返回null
*/
public String remove(String group, String key) {
group = StrUtil.nullToEmpty(group).trim();
writeLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.remove(key);
}
} finally {
writeLock.unlock();
}
return null;
}
/**
* 某个分组对应的键值对是否为空
*
* @param group 分组
* @return 是否为空
*/
public boolean isEmpty(String group) {
group = StrUtil.nullToEmpty(group).trim();
readLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.isEmpty();
}
} finally {
readLock.unlock();
}
return true;
}
/**
* 是否为空，如果多个分组同时为空，也按照空处理
*
* @return 是否为空，如果多个分组同时为空，也按照空处理
*/
@Override
public boolean isEmpty() {
return this.size() == 0;
}
/**
* 指定分组中是否包含指定key
*
* @param group 分组
* @param key 键
* @return 是否包含key
*/
public boolean containsKey(String group, String key) {
group = StrUtil.nullToEmpty(group).trim();
readLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.containsKey(key);
}
} finally {
readLock.unlock();
}
return false;
}
/**
* 指定分组中是否包含指定值
*
* @param group 分组
* @param value 值
* @return 是否包含值
*/
public boolean containsValue(String group, String value) {
group = StrUtil.nullToEmpty(group).trim();
readLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.containsValue(value);
}
} finally {
readLock.unlock();
}
return false;
}
/**
* 清除指定分组下的所有键值对
*
* @param group 分组
* @return this
*/
public GroupedMap clear(String group) {
group = StrUtil.nullToEmpty(group).trim();
writeLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
valueMap.clear();
}
} finally {
writeLock.unlock();
}
return this;
}
@Override
public Set keySet() {
readLock.lock();
try {
return super.keySet();
} finally {
readLock.unlock();
}
}
/**
* 指定分组所有键的Set
*
* @param group 分组
* @return 键Set
*/
public Set keySet(String group) {
group = StrUtil.nullToEmpty(group).trim();
readLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.keySet();
}
} finally {
readLock.unlock();
}
return Collections.emptySet();
}
/**
* 指定分组下所有值
*
* @param group 分组
* @return 值
*/
public Collection values(String group) {
group = StrUtil.nullToEmpty(group).trim();
readLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.values();
}
} finally {
readLock.unlock();
}
return Collections.emptyList();
}
@Override
public Set>> entrySet() {
readLock.lock();
try {
return super.entrySet();
} finally {
readLock.unlock();
}
}
/**
* 指定分组下所有键值对
*
* @param group 分组
* @return 键值对
*/
public Set> entrySet(String group) {
group = StrUtil.nullToEmpty(group).trim();
readLock.lock();
try {
final LinkedHashMap valueMap = this.get(group);
if (MapUtil.isNotEmpty(valueMap)) {
return valueMap.entrySet();
}
} finally {
readLock.unlock();
}
return Collections.emptySet();
}
@Override
public String toString() {
readLock.lock();
try {
return super.toString();
} finally {
readLock.unlock();
}
}
}
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