io.grpc.ChoiceServerCredentials Maven / Gradle / Ivy
/*
* Copyright 2020 The gRPC Authors
*
* 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 io.grpc;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* Provides a list of {@link ServerCredentials}, where any one may be used. The credentials are in
* preference order.
*/
public final class ChoiceServerCredentials extends ServerCredentials {
/**
* Constructs with the provided {@code creds} as options, with preferred credentials first.
*
* @throws IllegalArgumentException if no creds are provided
*/
public static ServerCredentials create(ServerCredentials... creds) {
if (creds.length == 0) {
throw new IllegalArgumentException("At least one credential is required");
}
return new ChoiceServerCredentials(creds);
}
private final List creds;
private ChoiceServerCredentials(ServerCredentials... creds) {
for (ServerCredentials cred : creds) {
if (cred == null) {
throw new NullPointerException();
}
}
this.creds = Collections.unmodifiableList(new ArrayList<>(Arrays.asList(creds)));
}
/** Non-empty list of credentials, in preference order. */
public List getCredentialsList() {
return creds;
}
}