在Apache Felix中，feature:repo-add命令用于将一个特性仓库添加到运行时中，而feature:install命令用于安装特性。它们的等效操作可以通过编程方式实现。

以下是使用Apache Felix的API来实现feature:repo-add和feature:install的等效操作的代码示例：

import org.apache.felix.framework.Felix;
import org.apache.felix.framework.util.FelixConstants;
import org.apache.felix.framework.util.StringMap;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.Constants;
import org.osgi.framework.launch.Framework;
import org.osgi.framework.launch.FrameworkFactory;
import org.osgi.resource.Capability;
import org.osgi.resource.Requirement;
import org.osgi.resource.Resource;
import org.osgi.service.feature.Feature;
import org.osgi.service.feature.FeatureService;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FeatureInstallationExample {

    public static void main(String[] args) throws Exception {
        // 创建Felix框架实例
        Map config = new HashMap<>();
        config.put(Constants.FRAMEWORK_STORAGE_CLEAN, Constants.FRAMEWORK_STORAGE_CLEAN_ONFIRSTINIT);
        config.put(FelixConstants.SYSTEMBUNDLE_ACTIVATORS_PROP, "org.apache.felix.framework.util.SecureAction");
        FrameworkFactory factory = new org.apache.felix.framework.FrameworkFactory();
        Framework framework = factory.newFramework(config);
        framework.init();

        // 获取BundleContext
        BundleContext context = framework.getBundleContext();

        // 添加特性仓库
        String repositoryUrl = "file:/path/to/feature/repository.xml"; // 替换为实际的特性仓库URL
        context.installBundle(repositoryUrl).start();

        // 安装特性
        String featureId = "example-feature"; // 替换为实际的特性ID
        FeatureService featureService = context.getService(context.getServiceReference(FeatureService.class));
        Feature feature = featureService.getFeature(featureId);
        List installedBundles = new ArrayList<>();
        for (Resource resource : feature.getBundles()) {
            Requirement requirement = resource.getRequirements(null).iterator().next();
            List capabilities = context.getBundle().adapt(FrameworkWiring.class).findProviders(requirement);
            Bundle bundle = context.installBundle(capabilities.get(0).getRevision().getURL());
            installedBundles.add(bundle);
        }
        for (Bundle bundle : installedBundles) {
            bundle.start();
        }

        // 关闭Felix框架
        framework.stop();
        framework.waitForStop(0);
    }
}

上述代码通过创建Felix框架实例并初始化它，然后获取BundleContext来执行等效于feature:repo-add和feature:install的操作。首先，它使用context.installBundle(repositoryUrl)方法来安装特性仓库，然后使用featureService.getFeature(featureId)方法获取特性对象，并通过遍历特性的资源来安装特性所需的Bundle。最后，它通过调用bundle.start()方法启动已安装的Bundle。

请注意，上述代码仅提供了一种使用Apache Felix的示例方法来实现等效操作，你可以根据实际需求和特性仓库的格式进行修改。