public String matches()

in src/main/java/org/apache/sling/discovery/impl/common/View.java [123:168]
41 lines of code
10 McCabe index (conditional complexity)

    public String matches(final Set<String> view) throws Exception {
        final Set<String> viewCopy = new HashSet<String>(view);
        final Resource members = getResource().getChild("members");
        if (members == null) {
            throw new Exception("no members resource found");
        }
        try{
	        final Iterator<Resource> it = members.getChildren().iterator();
	        StringBuffer sb = new StringBuffer();
	        boolean success = true;
	        while (it.hasNext()) {
	            Resource aMemberRes = it.next();
	
	            if (sb.length() != 0) {
	                sb.append(", ");
	            }
	            if (!viewCopy.remove(aMemberRes.getName())) {
	                success = false;
	                sb.append("old: " + aMemberRes.getName());
	            } else {
	                sb.append("fine: " + aMemberRes.getName());
	            }
	        }
	        // now the ViewCopy set must be empty to represent a match
	        if (viewCopy.size() != 0) {
	            success = false;
                if (sb.length() != 0) {
                    sb.append(", ");
                }
                for (String newlyAdded : viewCopy) {
                    sb.append("new: " + newlyAdded);
                }
	        }
	        if (success) {
	            return null;
	        } else {
	            return sb.toString();
	        }
        } catch(RuntimeException re) {
        	// SLING-2945 : the members resource could have been deleted
        	//              by another party simultaneously
        	//              so treat this situation nicely
        	logger.info("matches: cannot compare due to "+re);
        	throw new Exception("RuntimeException: "+re, re);
        }
    }