act.data.MapUtil Maven / Gradle / Ivy
package act.data;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import java.util.Map;
// Disclaim: the code come from PlayFramework
public class MapUtil {
public static void mergeValueInMap(Map map, String name, String value) {
String[] newValues;
String[] oldValues = map.get(name);
if (oldValues == null) {
newValues = new String[1];
newValues[0] = value;
} else {
newValues = new String[oldValues.length + 1];
System.arraycopy(oldValues, 0, newValues, 0, oldValues.length);
newValues[oldValues.length] = value;
}
map.put(name, newValues);
}
public static void mergeValueInMap(Map map, String name, String[] values) {
for (String value : values) {
mergeValueInMap(map, name, value);
}
}
public static Map filterMap(Map map, String keypattern) {
try {
@SuppressWarnings("unchecked")
Map filtered = map.getClass().newInstance();
for (Map.Entry entry : map.entrySet()) {
K key = entry.getKey();
if (key.toString().matches(keypattern)) {
filtered.put(key, entry.getValue());
}
}
return filtered;
} catch (Exception iex) {
return null;
}
}
}