/* | |
* Copyright 1999-2011 Alibaba Group. | |
* | |
* 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 com.alibaba.dubbo.common.utils; | |
import java.util.ArrayList; | |
import java.util.Collections; | |
import java.util.Comparator; | |
import java.util.HashMap; | |
import java.util.List; | |
import java.util.Map; | |
public class CollectionUtils { | |
@SuppressWarnings({ "unchecked", "rawtypes" }) | |
public static <T> List<T> sort(List<T> list) { | |
if (list != null && list.size() > 0) { | |
Collections.sort((List)list); | |
} | |
return list; | |
} | |
private static final Comparator<String> SIMPLE_NAME_COMPARATOR = new Comparator<String>() { | |
public int compare(String s1, String s2) { | |
if (s1 == null && s2 == null) { | |
return 0; | |
} | |
if (s1 == null) { | |
return -1; | |
} | |
if (s2 == null) { | |
return 1; | |
} | |
int i1 = s1.lastIndexOf('.'); | |
if (i1 >= 0) { | |
s1 = s1.substring(i1 + 1); | |
} | |
int i2 = s2.lastIndexOf('.'); | |
if (i2 >= 0) { | |
s2 = s2.substring(i2 + 1); | |
} | |
return s1.compareToIgnoreCase(s2); | |
} | |
}; | |
public static List<String> sortSimpleName(List<String> list) { | |
if (list != null && list.size() > 0) { | |
Collections.sort(list, SIMPLE_NAME_COMPARATOR); | |
} | |
return list; | |
} | |
public static Map<String, Map<String, String>> splitAll(Map<String, List<String>> list, String separator) { | |
if (list == null) { | |
return null; | |
} | |
Map<String, Map<String, String>> result = new HashMap<String, Map<String, String>>(); | |
for (Map.Entry<String, List<String>> entry : list.entrySet()) { | |
result.put(entry.getKey(), split(entry.getValue(), separator)); | |
} | |
return result; | |
} | |
public static Map<String, List<String>> joinAll(Map<String, Map<String, String>> map, String separator) { | |
if (map == null) { | |
return null; | |
} | |
Map<String, List<String>> result = new HashMap<String, List<String>>(); | |
for (Map.Entry<String, Map<String, String>> entry : map.entrySet()) { | |
result.put(entry.getKey(), join(entry.getValue(), separator)); | |
} | |
return result; | |
} | |
public static Map<String, String> split(List<String> list, String separator) { | |
if (list == null) { | |
return null; | |
} | |
Map<String, String> map = new HashMap<String, String>(); | |
if (list == null || list.size() == 0) { | |
return map; | |
} | |
for (String item : list) { | |
int index = item.indexOf(separator); | |
if (index == -1) { | |
map.put(item, ""); | |
} else { | |
map.put(item.substring(0, index), item.substring(index + 1)); | |
} | |
} | |
return map; | |
} | |
public static List<String> join(Map<String, String> map, String separator) { | |
if (map == null) { | |
return null; | |
} | |
List<String> list = new ArrayList<String>(); | |
if (map == null || map.size() == 0) { | |
return list; | |
} | |
for (Map.Entry<String, String> entry : map.entrySet()) { | |
String key = entry.getKey(); | |
String value = entry.getValue(); | |
if (value == null || value.length() == 0) { | |
list.add(key); | |
} else { | |
list.add(key + separator + value); | |
} | |
} | |
return list; | |
} | |
public static boolean mapEquals(Map<?, ?> map1, Map<?, ?> map2) { | |
if (map1 == null && map2 == null) { | |
return true; | |
} | |
if (map1 == null || map2 == null) { | |
return false; | |
} | |
if (map1.size() != map2.size()) { | |
return false; | |
} | |
for (Map.Entry<?, ?> entry : map1.entrySet()) { | |
Object key = entry.getKey(); | |
Object value1 = entry.getValue(); | |
Object value2 = map2.get(key); | |
if (! objectEquals(value1, value2)) { | |
return false; | |
} | |
} | |
return true; | |
} | |
private static boolean objectEquals(Object obj1, Object obj2) { | |
if (obj1 == null && obj2 == null) { | |
return true; | |
} | |
if (obj1 == null || obj2 == null) { | |
return false; | |
} | |
return obj1.equals(obj2); | |
} | |
public static Map<String, String> toStringMap(String... pairs) { | |
Map<String, String> parameters = new HashMap<String, String>(); | |
if (pairs.length > 0) { | |
if (pairs.length % 2 != 0) { | |
throw new IllegalArgumentException("pairs must be even."); | |
} | |
for (int i = 0; i < pairs.length; i = i + 2) { | |
parameters.put(pairs[i], pairs[i + 1]); | |
} | |
} | |
return parameters; | |
} | |
@SuppressWarnings("unchecked") | |
public static <K, V> Map<K, V> toMap(Object ... pairs) { | |
Map<K, V> ret = new HashMap<K, V>(); | |
if (pairs == null || pairs.length == 0) return ret; | |
if (pairs.length % 2 != 0) { | |
throw new IllegalArgumentException("Map pairs can not be odd number."); | |
} | |
int len = pairs.length / 2; | |
for (int i = 0; i < len; i ++) { | |
ret.put((K) pairs[2 * i], (V) pairs[2 * i + 1]); | |
} | |
return ret; | |
} | |
private CollectionUtils() { | |
} | |
} |