| package org.projectfloodlight.openflow.types; |
| |
| import org.jboss.netty.buffer.ChannelBuffer; |
| import org.projectfloodlight.openflow.annotations.Immutable; |
| import org.projectfloodlight.openflow.exceptions.OFParseError; |
| |
| import com.google.common.hash.PrimitiveSink; |
| import com.google.common.primitives.UnsignedInts; |
| |
| /** |
| * Abstraction of an logical / OpenFlow group (ofp_group) in OpenFlow. |
| * Immutable. |
| * |
| * @author Andreas Wundsam {@literal <}andreas.wundsam@bigswitch.com{@literal >} |
| */ |
| @Immutable |
| public class OFGroup implements OFValueType<OFGroup> { |
| static final int LENGTH = 4; |
| |
| // private int constants (OF1.1+) to avoid duplication in the code |
| // should not have to use these outside this class |
| private static final int ZERO_VAL = 0x00; |
| private static final int MAX_VAL = 0xffffff00; |
| private static final int ALL_VAL = 0xfffffffc; |
| private static final int ANY_VAL = 0xffffffff; |
| |
| |
| // ////////////// public constants - use to access well known OpenFlow group constants |
| |
| /** Maximum number of physical and logical switch groups. */ |
| public final static OFGroup MAX = new NamedGroup(MAX_VAL, "max"); |
| |
| /** All groups */ |
| public final static OFGroup ALL = new NamedGroup(ALL_VAL, "all"); |
| |
| /** |
| * Wildcard group used only for flow mod (delete) and flow stats requests. */ |
| public final static OFGroup ANY = new NamedGroup(ANY_VAL, "any"); |
| |
| /** group 0 in case we need it */ |
| public static final OFGroup ZERO = OFGroup.of(ZERO_VAL); |
| |
| public static final OFGroup NO_MASK = ANY; |
| public static final OFGroup FULL_MASK = ZERO; |
| |
| /** raw openflow group number as a signed 32 bit integer */ |
| private final int groupNumber; |
| |
| /** private constructor. use of*-Factory methods instead */ |
| private OFGroup(final int portNumber) { |
| this.groupNumber = portNumber; |
| } |
| |
| /** |
| * get an OFGroup object corresponding to a raw 32-bit integer group number. |
| * NOTE: The group object may either be newly allocated or cached. Do not |
| * rely on either behavior. |
| * |
| * @param groupNumber the raw 32-bit group number |
| * @return a corresponding OFPort |
| */ |
| public static OFGroup of(final int groupNumber) { |
| switch(groupNumber) { |
| case ZERO_VAL: |
| return MAX; |
| case MAX_VAL: |
| return MAX; |
| case ALL_VAL: |
| return ALL; |
| case ANY_VAL: |
| return ANY; |
| default: |
| if(UnsignedInts.compare(groupNumber, MAX_VAL) > 0) { |
| // greater than max_val, but not one of the reserved values |
| throw new IllegalArgumentException("Unknown special group number: " |
| + groupNumber); |
| } |
| return new OFGroup(groupNumber); |
| } |
| } |
| |
| /** return the group number as a int32 */ |
| public int getGroupNumber() { |
| return groupNumber; |
| } |
| |
| @Override |
| public String toString() { |
| return UnsignedInts.toString(groupNumber); |
| } |
| |
| /** Extension of OFGroup for named groups */ |
| static class NamedGroup extends OFGroup { |
| private final String name; |
| |
| NamedGroup(final int portNo, final String name) { |
| super(portNo); |
| this.name = name; |
| } |
| |
| public String getName() { |
| return name; |
| } |
| |
| @Override |
| public String toString() { |
| return name; |
| } |
| } |
| |
| @Override |
| public int getLength() { |
| return LENGTH; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (!(obj instanceof OFGroup)) |
| return false; |
| OFGroup other = (OFGroup)obj; |
| if (other.groupNumber != this.groupNumber) |
| return false; |
| return true; |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 53; |
| int result = 1; |
| result = prime * result + groupNumber; |
| return result; |
| } |
| |
| public void write4Bytes(ChannelBuffer c) { |
| c.writeInt(this.groupNumber); |
| } |
| |
| public static OFGroup read4Bytes(ChannelBuffer c) throws OFParseError { |
| return OFGroup.of(c.readInt()); |
| } |
| |
| @Override |
| public OFGroup applyMask(OFGroup mask) { |
| return OFGroup.of(this.groupNumber & mask.groupNumber); |
| } |
| |
| @Override |
| public int compareTo(OFGroup o) { |
| return UnsignedInts.compare(this.groupNumber, o.groupNumber); |
| } |
| |
| @Override |
| public void putTo(PrimitiveSink sink) { |
| sink.putInt(groupNumber); |
| } |
| } |