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MapUtil.java
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43 lines (38 loc) · 1.36 KB
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package act.data;
import java.util.Map;
// Disclaim: the code come from PlayFramework
public class MapUtil {
public static void mergeValueInMap(Map<String, String[]> 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<String, String[]> map, String name, String[] values) {
for (String value : values) {
mergeValueInMap(map, name, value);
}
}
public static <K, V> Map<K, V> filterMap(Map<K, V> map, String keypattern) {
try {
@SuppressWarnings("unchecked")
Map<K, V> filtered = map.getClass().newInstance();
for (Map.Entry<K, V> entry : map.entrySet()) {
K key = entry.getKey();
if (key.toString().matches(keypattern)) {
filtered.put(key, entry.getValue());
}
}
return filtered;
} catch (Exception iex) {
return null;
}
}
}