import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map.Entry;
import java.util.Properties;

import org.apache.maven.toolchain.MisconfiguredToolchainException;
import org.apache.maven.toolchain.RequirementMatcher;
import org.apache.maven.toolchain.RequirementMatcherFactory;
import org.apache.maven.toolchain.ToolchainFactory;

public class DefaultToolchainsBuilder implements ToolchainsBuilder {
    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public PersistedToolchains build(File userToolchainsFile) throws MisconfiguredToolchainException {
        PersistedToolchains toolchains = null;

        if (userToolchainsFile != null && userToolchainsFile.isFile()) {
            try (InputStream in = Files.newInputStream(userToolchainsFile.toPath())) {

                    try {
                        return getToolchainV4(v3Factory.createToolchain(new ToolchainModel(model)));
                    } catch (MisconfiguredToolchainException e) {
                        throw new RuntimeException(e);
                    }
                }

                @Nonnull
                @Override