import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
private Function<LocalFile, String> localFileToPathString()
{
    return new Function<LocalFile, String>()
    {
        public String apply(LocalFile file)
        {
            return file.getPath().toString();
        }
    };
}
 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
@Override
public ConfigDiff transaction(ConfigSource config,
                              int taskCount,
                              FileOutputPlugin.Control control)
{
    PluginTask task = config.loadConfig(PluginTask.class);

    if (task.getP12KeyfilePath().isPresent()) {
        if (task.getP12Keyfile().isPresent()) {
            throw new ConfigException("Setting both p12_keyfile_path and p12_keyfile is invalid");
        }
        try {
            task.setP12Keyfile(Optional.of(LocalFile.of(task.getP12KeyfilePath().get())));
        }
        catch (IOException ex) {
            throw Throwables.propagate(ex);
        }
    }

    if (task.getAuthMethod().getString().equals("json_key")) {
        if (!task.getJsonKeyfile().isPresent()) {
            throw new ConfigException("If auth_method is json_key, you have to set json_keyfile");
        }
    }
    else if (task.getAuthMethod().getString().equals("private_key")) {
        if (!task.getP12Keyfile().isPresent() || !task.getServiceAccountEmail().isPresent()) {
            throw new ConfigException("If auth_method is private_key, you have to set both service_account_email and p12_keyfile");
        }
    }

    return resume(task.dump(), taskCount, control);
}
 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
@Config("avsc")
LocalFile getAvsc();
 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
@Config("secret_key_file")
@ConfigDefault("null")
public Optional<LocalFile> getSecretKeyFilePath();
 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
@Config("p12_keyfile")
@ConfigDefault("null")
Optional<LocalFile> getP12Keyfile();
 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
@Config("json_keyfile")
@ConfigDefault("null")
Optional<LocalFile> getJsonKeyfile();
 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
public void setSecretKeyFilePath(Optional<LocalFile> secretKeyFilePath); 

import org.embulk.spi.unit.LocalFile; //导入依赖的package包/类
void setP12Keyfile(Optional<LocalFile> p12Keyfile);