package org.handwerkszeug.dns.conf;

import java.util.ArrayList;
import java.util.List;

import org.handwerkszeug.chain.Chain;
import org.handwerkszeug.chain.ChainResult;
import org.handwerkszeug.chain.impl.DefaultChainExecutor;
import org.handwerkszeug.dns.NameServerContainer;
import org.handwerkszeug.dns.NameServerContainerProvider;

public
class DefaultNameServerContainer implements NameServerContainer {

    protected Chain<List<String>, ChainResult> executor;

    @Override
    public
    String name() {
        return NameServerContainerProvider.DEFAULT_NAME;
    }

    @Override
    public
    List<String> nameservers() {
        List<String> result = new ArrayList<String>();
        this.executor.execute(result);
        return result;
    }

    @Override
    public
    void initialize() {
        // FIXME this code run only sun JRE.
        // find from IBM JDK. JRockit.
        DefaultChainExecutor<List<String>, ChainResult> dce = new DefaultChainExecutor<List<String>, ChainResult>();
        dce.add(new SystemProperties());
        dce.add(new SunJRE());
        dce.add(new ResolvConf());
        this.executor = dce;
    }

    @Override
    public
    void dispose() {
        // do nothing.
    }
}