io.netty.handler.ssl.ApplicationProtocolUtil Maven / Gradle / Ivy
/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.handler.ssl;
import java.util.ArrayList;
import java.util.List;
/**
* Utility class for application protocol common operations.
*/
final class ApplicationProtocolUtil {
private static final int DEFAULT_LIST_SIZE = 2;
private ApplicationProtocolUtil() {
}
static List toList(Iterable protocols) {
return toList(DEFAULT_LIST_SIZE, protocols);
}
static List toList(int initialListSize, Iterable protocols) {
if (protocols == null) {
return null;
}
List result = new ArrayList(initialListSize);
for (String p : protocols) {
if (p == null || p.isEmpty()) {
throw new IllegalArgumentException("protocol cannot be null or empty");
}
result.add(p);
}
if (result.isEmpty()) {
throw new IllegalArgumentException("protocols cannot empty");
}
return result;
}
static List toList(String... protocols) {
return toList(DEFAULT_LIST_SIZE, protocols);
}
static List toList(int initialListSize, String... protocols) {
if (protocols == null) {
return null;
}
List result = new ArrayList(initialListSize);
for (String p : protocols) {
if (p == null || p.isEmpty()) {
throw new IllegalArgumentException("protocol cannot be null or empty");
}
result.add(p);
}
if (result.isEmpty()) {
throw new IllegalArgumentException("protocols cannot empty");
}
return result;
}
}