public Type compareTopology()

in src/main/java/org/apache/sling/discovery/base/commons/DefaultTopologyView.java [67:118]
51 lines of code
18 McCabe index (conditional complexity)

    public Type compareTopology(final DefaultTopologyView other) {
        if (other == null) {
            throw new IllegalArgumentException("other must not be null");
        }
        if ((localClusterSyncTokenId == null && other.localClusterSyncTokenId != null)
                || (other.localClusterSyncTokenId == null && localClusterSyncTokenId != null)
                || (localClusterSyncTokenId != null && !localClusterSyncTokenId.equals(other.localClusterSyncTokenId))) {
            logger.debug("compareTopology: different localClusterSyncTokenId");
            return Type.TOPOLOGY_CHANGED;
        }
        if (this.instances.size() != other.instances.size()) {
        	logger.debug("compareTopology: different number of instances");
            return Type.TOPOLOGY_CHANGED;
        }
        boolean propertiesChanged = false;
        for(final InstanceDescription instance : this.instances) {

            final Iterator<InstanceDescription> it2 = other.instances.iterator();
            InstanceDescription matchingInstance = null;
            while (it2.hasNext()) {
                final InstanceDescription otherInstance = it2.next();
                if (instance.getSlingId().equals(otherInstance.getSlingId())) {
                    matchingInstance = otherInstance;
                    break;
                }
            }
            if (matchingInstance == null) {
            	if (logger.isDebugEnabled()) {
	            	logger.debug("compareTopology: no matching instance found for {}", instance);
            	}
                return Type.TOPOLOGY_CHANGED;
            }
            if (!instance.getClusterView().getId()
                    .equals(matchingInstance.getClusterView().getId())) {
            	logger.debug("compareTopology: cluster view id does not match");
                return Type.TOPOLOGY_CHANGED;
            }
            if (!instance.isLeader()==matchingInstance.isLeader()) {
                logger.debug("compareTopology: leaders differ");
                return Type.TOPOLOGY_CHANGED;
            }
            if (!instance.getProperties().equals(
                    matchingInstance.getProperties())) {
                propertiesChanged = true;
            }
        }
        if (propertiesChanged) {
            return Type.PROPERTIES_CHANGED;
        } else {
            return null;
        }
    }