io.grpc.internal.OverrideAuthorityNameResolverFactory Maven / Gradle / Ivy
/*
* Copyright 2017 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.internal;
import io.grpc.NameResolver;
import java.net.URI;
import javax.annotation.Nullable;
/**
* A wrapper class that overrides the authority of a NameResolver, while preserving all other
* functionality.
*/
final class OverrideAuthorityNameResolverFactory extends NameResolver.Factory {
private final NameResolver.Factory delegate;
private final String authorityOverride;
/**
* Constructor for the {@link NameResolver.Factory}
*
* @param delegate The actual underlying factory that will produce the a {@link NameResolver}
* @param authorityOverride The authority that will be returned by {@link
* NameResolver#getServiceAuthority()}
*/
OverrideAuthorityNameResolverFactory(NameResolver.Factory delegate, String authorityOverride) {
this.delegate = delegate;
this.authorityOverride = authorityOverride;
}
@Nullable
@Override
public NameResolver newNameResolver(URI targetUri, NameResolver.Helper helper) {
final NameResolver resolver = delegate.newNameResolver(targetUri, helper);
// Do not wrap null values. We do not want to impede error signaling.
if (resolver == null) {
return null;
}
return new ForwardingNameResolver(resolver) {
@Override
public String getServiceAuthority() {
return authorityOverride;
}
};
}
@Override
public String getDefaultScheme() {
return delegate.getDefaultScheme();
}
}