import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Determines if the filtering objective will be used for a pseudowire.
 *
 * @param filteringObjective
 * @return True if objective was created for a pseudowire, false otherwise.
 */
private boolean isPseudowire(FilteringObjective filteringObjective) {


    if (filteringObjective.meta() != null) {

        TrafficTreatment treatment = filteringObjective.meta();
        for (Instruction instr : treatment.immediate()) {
            if (instr.type().equals(Instruction.Type.L2MODIFICATION)) {

                L2ModificationInstruction l2Instr = (L2ModificationInstruction) instr;
                if (l2Instr.subtype().equals(L2SubType.TUNNEL_ID)) {
                    return true;
                }
            }
        }
    }

    return false;
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Returns the MPLS label-id in a traffic treatment.
 *
 * @param tt the traffic treatment
 * @return an integer representing the MPLS label-id, or -1 if not found
 */
static int readLabelFromTreatment(TrafficTreatment tt) {
    for (Instruction ins : tt.allInstructions()) {
        if (ins.type() == Instruction.Type.L2MODIFICATION) {
            L2ModificationInstruction insl2 = (L2ModificationInstruction) ins;
            if (insl2.subtype() == L2SubType.MPLS_LABEL) {
                return ((L2ModificationInstruction.ModMplsLabelInstruction) insl2)
                            .label().id();
            }
        }
    }
    return -1;
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Creates a l2 src modification.
 *
 * @param addr the mac address to modify to
 * @return a l2 modification
 */
public static L2ModificationInstruction modL2Src(MacAddress addr) {
    checkNotNull(addr, "Src l2 address cannot be null");
    return new ModEtherInstruction(L2SubType.ETH_SRC, addr);
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Creates a L2 dst modification.
 *
 * @param addr the mac address to modify to
 * @return a L2 modification
 */
public static L2ModificationInstruction modL2Dst(MacAddress addr) {
    checkNotNull(addr, "Dst l2 address cannot be null");
    return new ModEtherInstruction(L2SubType.ETH_DST, addr);
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Creates a push MPLS header instruction.
 *
 * @return a L2 modification.
 */
public static Instruction pushMpls() {
    return new PushHeaderInstructions(L2SubType.MPLS_PUSH,
                                      Ethernet.MPLS_UNICAST);
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Creates a pop MPLS header instruction.
 *
 * @return a L2 modification.
 */
public static Instruction popMpls() {
    return new PushHeaderInstructions(L2SubType.MPLS_POP,
                                      Ethernet.MPLS_UNICAST);
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Creates a pop VLAN header instruction.
 *
 * @return a L2 modification
 */
public static Instruction popVlan() {
    return new PopVlanInstruction(L2SubType.VLAN_POP);
}
 

import org.onosproject.net.flow.instructions.L2ModificationInstruction.L2SubType; //导入依赖的package包/类
/**
 * Creates a push VLAN header instruction.
 *
 * @return a L2 modification
 */
public static Instruction pushVlan() {
    return new PushHeaderInstructions(L2SubType.VLAN_PUSH, Ethernet.TYPE_VLAN);
}