hugegraph-core/src/main/java/org/apache/hugegraph/job/algorithm/AbstractAlgorithm.java [261:273]:
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    protected static Directions parseDirection(Object direction) {
        if (direction.equals(Directions.BOTH.toString())) {
            return Directions.BOTH;
        } else if (direction.equals(Directions.OUT.toString())) {
            return Directions.OUT;
        } else if (direction.equals(Directions.IN.toString())) {
            return Directions.IN;
        } else {
            throw new IllegalArgumentException(String.format(
                      "The value of direction must be in [OUT, IN, BOTH], " +
                      "but got '%s'", direction));
        }
    }
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hugegraph-core/src/main/java/org/apache/hugegraph/job/computer/AbstractComputer.java [255:267]:
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    protected static Directions parseDirection(Object direction) {
        if (direction.equals(Directions.BOTH.toString())) {
            return Directions.BOTH;
        } else if (direction.equals(Directions.OUT.toString())) {
            return Directions.OUT;
        } else if (direction.equals(Directions.IN.toString())) {
            return Directions.IN;
        } else {
            throw new IllegalArgumentException(String.format(
                      "The value of direction must be in [OUT, IN, BOTH], " +
                      "but got '%s'", direction));
        }
    }
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