nattraverser/src/com/md87/nat/NatType.java

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package com.md87.nat;

/**
 *
 * @author chris
 */
public enum NatType {

    OPEN(true),
    FULL_CONE(true),
    RESTRICTED_CONE(false),
    PORT_RESTRICTED_CONE(false),
    SYMMETRIC(false);

    private final boolean canTraverseWithSymmetric;

    NatType(final boolean canTraverseWithSymmetric) {
        this.canTraverseWithSymmetric = canTraverseWithSymmetric;
    }

    public boolean canTraverseWith(final NatType type) {
        if (type == SYMMETRIC) {
            return canTraverseWithSymmetric;
        } else if (this == SYMMETRIC) {
            return type.canTraverseWith(this);
        } else  {
            return true;
        }
    }

}