public S3URI getChild(String relativePath) throws IllegalArgumentException {
        Preconditions.checkNotNull(relativePath, "relativePath must be non-null.");

        if (relativePath.isEmpty()) {
            return this;
        } else if (relativePath.startsWith(S3_DELIMITER)) {
            throw new IllegalArgumentException(String.format(
                    "Path '%s' should be relative but begins with the delimiter string '%s'.",
                    relativePath, S3_DELIMITER));
        }

        if (key == null) {
            return new S3URI(bucket, relativePath);
        } else {
            return new S3URI(bucket, key + S3_DELIMITER + relativePath);
        }
    }
public S3URI getChild(String relativePath) throws IllegalArgumentException {
        Preconditions.checkNotNull(relativePath, "relativePath must be non-null.");

        if (relativePath.isEmpty()) {
            return this;
        } else if (relativePath.startsWith(S3_DELIMITER)) {
            throw new IllegalArgumentException(String.format(
                    "Path '%s' should be relative but begins with the delimiter string '%s'.",
                    relativePath, S3_DELIMITER));
        }

        if (key == null) {
            return new S3URI(bucket, relativePath);
        } else {
            return new S3URI(bucket, key + S3_DELIMITER + relativePath);
        }
    }
public S3URI getChild ( String relativePath ) throws IllegalArgumentException { Preconditions . checkNotNull ( relativePath , "relativePath must be non-null." ) ; if ( relativePath . isEmpty ( ) ) { return this ; } else if ( relativePath . startsWith ( S3_DELIMITER ) ) { throw new IllegalArgumentException ( String . format ( "Path '%s' should be relative but begins with the delimiter string '%s'." , relativePath , S3_DELIMITER ) ) ; } if ( key == null ) { return new S3URI ( bucket , relativePath ) ; } else { return new S3URI ( bucket , key + S3_DELIMITER + relativePath ) ; } }
Creates a new URI by resolving the specified path relative to {@code this}. If {@code key == null}, the key
of the returned URI will simply be {@code relativePath}.

@param relativePath  a path relative to {@code this}. Must be non-null.
@return  the child URI.
@throws IllegalArgumentException  if the path starts with a {@link #S3_DELIMITER delimiter}.
The path must be relative.
Creates a new URI by resolving the specified path relative to { @code this } . If { @code key == null } the key of the returned URI will simply be { @code relativePath } .