Examples with AclIpSpaceLine org.batfish.datamodel.AclIpSpaceLine used on opensource projects

Example 1 with AclIpSpaceLine

use of org.batfish.datamodel.AclIpSpaceLine in project batfish by batfish.

the class IpSpaceSimplifier method visitAclIpSpace.

@Override
public IpSpace visitAclIpSpace(AclIpSpace aclIpSpace) {
    /*
     * To simplify an AclIpSpace: 1) Simplify the IpSpace of each line. 2) Remove EmptyIpSpace
     * lines. 3) Remove all lines after the first UniverseIpSpace line - More generally, we could
     * remove all lines whose spaces are covered by a previous line, but this is not implemented.
     * It's also probably too expensive to implement a complete IpSpace subset operation, so we'll
     * stick to the easy and most important case.
     */
    List<AclIpSpaceLine> simplifiedLines = new ArrayList<>();
    for (AclIpSpaceLine line : aclIpSpace.getLines()) {
        IpSpace simplifiedLineIpSpace = line.getIpSpace().accept(this);
        if (simplifiedLineIpSpace == EmptyIpSpace.INSTANCE) {
            continue;
        }
        AclIpSpaceLine simplifiedLine = line.rebuild().setIpSpace(simplifiedLineIpSpace).build();
        simplifiedLines.add(simplifiedLine);
        if (simplifiedLineIpSpace == UniverseIpSpace.INSTANCE) {
            break;
        }
    }
    /*
     * If there is only one line, and it accepts, then simplify to the space of that line.
     */
    if (simplifiedLines.size() == 1 && simplifiedLines.get(0).getAction() == LineAction.ACCEPT) {
        return simplifiedLines.get(0).getIpSpace();
    }
    /*
     * If all lines reject (or there are no lines), simplify to EmptyIpSpace.
     */
    if (simplifiedLines.stream().allMatch(line -> line.getAction() == LineAction.REJECT)) {
        return EmptyIpSpace.INSTANCE;
    }
    /*
     * If all lines are accepts, and the last accepts UniverseIpSpace, then this can be simplified
     * to UniverseIpSpace.
     */
    if (simplifiedLines.get(simplifiedLines.size() - 1).getIpSpace() == UniverseIpSpace.INSTANCE && simplifiedLines.stream().allMatch(line -> line.getAction() == LineAction.ACCEPT)) {
        return UniverseIpSpace.INSTANCE;
    }
    return AclIpSpace.builder().setLines(simplifiedLines).build();
}

Example 2 with AclIpSpaceLine

use of org.batfish.datamodel.AclIpSpaceLine in project batfish by batfish.

the class IpSpaceBooleanExprTransformer method visitAclIpSpace.

@Override
public BooleanExpr visitAclIpSpace(AclIpSpace aclIpSpace) {
    // right fold
    BooleanExpr expr = FalseExpr.INSTANCE;
    for (int i = aclIpSpace.getLines().size() - 1; i >= 0; i--) {
        AclIpSpaceLine line = aclIpSpace.getLines().get(i);
        expr = new IfThenElse(line.getIpSpace().accept(this), line.getAction() == LineAction.ACCEPT ? TrueExpr.INSTANCE : FalseExpr.INSTANCE, expr);
    }
    return expr;
}