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JDBC Driver for Google Cloud Spanner

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/*
 * 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 nl.topicus.jdbc.shaded.io.netty.resolver;

import nl.topicus.jdbc.shaded.io.netty.util.concurrent.EventExecutor;
import nl.topicus.jdbc.shaded.io.netty.util.concurrent.Promise;
import nl.topicus.jdbc.shaded.io.netty.util.internal.UnstableApi;

import java.net.SocketAddress;
import java.util.Collections;
import java.util.List;

/**
 * A {@link AddressResolver} that does not perform any resolution but always reports successful resolution.
 * This resolver is useful when name resolution is performed by a handler in a pipeline, such as a proxy handler.
 */
@UnstableApi
public class NoopAddressResolver extends AbstractAddressResolver {

    public NoopAddressResolver(EventExecutor executor) {
        super(executor);
    }

    @Override
    protected boolean doIsResolved(SocketAddress address) {
        return true;
    }

    @Override
    protected void doResolve(SocketAddress unresolvedAddress, Promise promise) throws Exception {
        promise.setSuccess(unresolvedAddress);
    }

    @Override
    protected void doResolveAll(
            SocketAddress unresolvedAddress, Promise> promise) throws Exception {
        promise.setSuccess(Collections.singletonList(unresolvedAddress));
    }
}