android.gov.nist.javax.sip.header.SIPHeaderNamesCache Maven / Gradle / Ivy
package android.gov.nist.javax.sip.header;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* @author yanick.belanger
*/
public abstract class SIPHeaderNamesCache
{
private static final Map lowercaseMap = new ConcurrentHashMap();
static {
Field[] fields = SIPHeaderNames.class.getFields();
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
if (field.getType().equals(String.class) && Modifier.isStatic(field.getModifiers())) {
try {
String value = (String) field.get(null);
String lowerCase = value.toLowerCase();
lowercaseMap.put(value, lowerCase);
lowercaseMap.put(lowerCase, lowerCase);
} catch (IllegalAccessException e) {
}
}
}
}
public static String toLowerCase(String headerName) {
String lowerCase = (String) lowercaseMap.get(headerName);
if (lowerCase == null) {
lowerCase = headerName.toLowerCase().intern();
lowercaseMap.put(headerName, lowerCase);
lowercaseMap.put(lowerCase, lowerCase);
return lowerCase;
}
else {
return lowerCase;
}
}
}