holyjak/S3Facade.java

## S3Facade.java
public interface S3Facade {
    List<S3File> listObjects(String bucketName);
}

## S3FacadeImpl.java
public class S3FacadeImpl implements S3Facade {

    AmazonS3Client amazonS3Client;

    @Override
    public List<S3File> listObjects(String bucketName) {
        List<S3File> result = new ArrayList<S3File>();
        List<S3ObjectSummary> files = this.amazonS3Client.listObjects(bucketName).getObjectSummaries();
        for (S3ObjectSummary file : files) {
            result.add(new S3File(file.getKey(), file.getKey())); // later we can use st. else for the display name
        }
        return result;
    }

}

## S3File.java
public class S3File {
    public final String displayName;
    public final String path;

    public S3File(String displayName, String path) {
        this.displayName = displayName;
        this.path = path;
    }
}

## S3FilesResource.java
public class S3FilesResource {

    S3Facade amazonS3Client = new S3FacadeImpl();

    // ...

    @Path("/files")
    public String listS3Files() {
        StringBuilder html = new StringBuilder("<html><body>");
        List<S3File> files = fetchS3Files();
        for (S3File file : files) {
            html.append("<a href='/content?fileName=").append(file.path).append("'>").append(file.displayName)
                    .append("</a><br>");
        }
        return html.append("</body></html>").toString();
    }

    List<S3File> fetchS3Files() {
        List<S3File> files = this.amazonS3Client.listObjects("myBucket");
        List<S3File> result = new ArrayList<S3File>(files.size());
        for (S3File file : files) {
            if (!file.path.endsWith("/")) {
                result.add(file);
            }
        }
        return result;
    }

    @Path("/content")
    public String getContent(@QueryParam("fileName") String fileName) {
        throw new UnsupportedOperationException("Not implemented yet");
    }

}
	public interface S3Facade {
	List<S3File> listObjects(String bucketName);
	}
	public class S3FacadeImpl implements S3Facade {

	AmazonS3Client amazonS3Client;

	@Override
	public List<S3File> listObjects(String bucketName) {
	List<S3File> result = new ArrayList<S3File>();
	List<S3ObjectSummary> files = this.amazonS3Client.listObjects(bucketName).getObjectSummaries();
	for (S3ObjectSummary file : files) {
	result.add(new S3File(file.getKey(), file.getKey())); // later we can use st. else for the display name
	}
	return result;
	}

	}
	public class S3File {
	public final String displayName;
	public final String path;

	public S3File(String displayName, String path) {
	this.displayName = displayName;
	this.path = path;
	}
	}
	public class S3FilesResource {

	S3Facade amazonS3Client = new S3FacadeImpl();

	// ...

	@Path("/files")
	public String listS3Files() {
	StringBuilder html = new StringBuilder("<html><body>");
	List<S3File> files = fetchS3Files();
	for (S3File file : files) {
	html.append("<a href='/content?fileName=").append(file.path).append("'>").append(file.displayName)
	.append("</a><br>");
	}
	return html.append("</body></html>").toString();
	}

	List<S3File> fetchS3Files() {
	List<S3File> files = this.amazonS3Client.listObjects("myBucket");
	List<S3File> result = new ArrayList<S3File>(files.size());
	for (S3File file : files) {
	if (!file.path.endsWith("/")) {
	result.add(file);
	}
	}
	return result;
	}

	@Path("/content")
	public String getContent(@QueryParam("fileName") String fileName) {
	throw new UnsupportedOperationException("Not implemented yet");
	}

	}