public boolean contains(final Object key) {
        return this.parameters.containsKey(key);
    }
Checks for existence of key in parameter set.

@param key the key to check
@return {@code true} if the key is present and {@code false} otherwise
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/Parameters.java