io.netty.resolver.dns.SequentialDnsServerAddressStream Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright 2015 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.resolver.dns;

import java.net.InetSocketAddress;
import java.util.Collection;
import java.util.List;

final class SequentialDnsServerAddressStream implements DnsServerAddressStream {

    private final List addresses;
    private int i;

    SequentialDnsServerAddressStream(List addresses, int startIdx) {
        this.addresses = addresses;
        i = startIdx;
    }

    @Override
    public InetSocketAddress next() {
        int i = this.i;
        InetSocketAddress next = addresses.get(i);
        if (++ i < addresses.size()) {
            this.i = i;
        } else {
            this.i = 0;
        }
        return next;
    }

    @Override
    public int size() {
        return addresses.size();
    }

    @Override
    public SequentialDnsServerAddressStream duplicate() {
        return new SequentialDnsServerAddressStream(addresses, i);
    }

    @Override
    public String toString() {
        return toString("sequential", i, addresses);
    }

    static String toString(String type, int index, Collection addresses) {
        final StringBuilder buf = new StringBuilder(type.length() + 2 + addresses.size() * 16);
        buf.append(type).append("(index: ").append(index);
        buf.append(", addrs: (");
        for (InetSocketAddress a: addresses) {
            buf.append(a).append(", ");
        }

        buf.setLength(buf.length() - 2);
        buf.append("))");

        return buf.toString();
    }
}