hugegraph-loader/src/main/java/org/apache/hugegraph/loader/builder/ElementBuilder.java [259:299]:
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        StringBuilder vertexId = new StringBuilder();
        StringBuilder vertexKeysId = new StringBuilder();
        for (Object value : primaryValues) {
            String pkValue;
            if (value instanceof Number || value instanceof Date) {
                pkValue = LongEncoding.encodeNumber(value);
            } else {
                pkValue = String.valueOf(value);
            }
            if (StringUtils.containsAny(pkValue, Constants.SEARCH_LIST)) {
                pkValue = StringUtils.replaceEach(pkValue,
                                                  Constants.SEARCH_LIST,
                                                  Constants.TARGET_LIST);
            }
            vertexKeysId.append(pkValue);
            vertexKeysId.append("!");
        }
        vertexId.append(vertexLabel.id()).append(":").append(vertexKeysId);
        vertexId.deleteCharAt(vertexId.length() - 1);
        return vertexId.toString();
    }

    private void checkVertexIdLength(String id) {
        this.encoder.reset();
        this.buffer.clear();
        CoderResult r = this.encoder.encode(CharBuffer.wrap(id.toCharArray()),
                                            this.buffer, true);
        E.checkArgument(r.isUnderflow(),
                        "The vertex id length exceeds limit %s : '%s'",
                        Constants.VERTEX_ID_LIMIT, id);
    }

    private boolean isEmptyPkValue(Object pkValue) {
        if (pkValue == null) {
            return true;
        }
        if (pkValue instanceof String) {
            String pkValueStr = (String) pkValue;
            return pkValueStr.isEmpty();
        }
        return false;
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hugegraph-spark-connector/src/main/java/org/apache/hugegraph/spark/connector/builder/ElementBuilder.java [183:223]:
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        StringBuilder vertexId = new StringBuilder();
        StringBuilder vertexKeysId = new StringBuilder();
        for (Object value : primaryValues) {
            String pkValue;
            if (value instanceof Number || value instanceof Date) {
                pkValue = LongEncoding.encodeNumber(value);
            } else {
                pkValue = String.valueOf(value);
            }
            if (StringUtils.containsAny(pkValue, Constants.SEARCH_LIST)) {
                pkValue = StringUtils.replaceEach(pkValue,
                                                  Constants.SEARCH_LIST,
                                                  Constants.TARGET_LIST);
            }
            vertexKeysId.append(pkValue);
            vertexKeysId.append("!");
        }
        vertexId.append(vertexLabel.id()).append(":").append(vertexKeysId);
        vertexId.deleteCharAt(vertexId.length() - 1);
        return vertexId.toString();
    }

    private void checkVertexIdLength(String id) {
        this.encoder.reset();
        this.buffer.clear();
        CoderResult r = this.encoder.encode(CharBuffer.wrap(id.toCharArray()),
                                            this.buffer, true);
        E.checkArgument(r.isUnderflow(),
                        "The vertex id length exceeds limit %s : '%s'",
                        Constants.VERTEX_ID_LIMIT, id);
    }

    private boolean isEmptyPkValue(Object pkValue) {
        if (pkValue == null) {
            return true;
        }
        if (pkValue instanceof String) {
            String pkValueStr = (String) pkValue;
            return pkValueStr.isEmpty();
        }
        return false;
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