public void pushNamespace()

in core/src/main/java/org/apache/commons/jelly/XMLOutput.java [115:170]
36 lines of code
11 McCabe index (conditional complexity)

        public void pushNamespace(String prefix, String uri) throws SAXException {
            Map prefixUriMap;

            if (prefix == null) {
                prefix = "";
            }
            if (uri == null) {
                uri = "";
            }

            if ("xml".equals(prefix)) {
                // We should ignore setting 'xml' prefix
                // As declared in java of ContentHandler#startPrefixMapping
                return;
            }

            // Lets find out if we already declared this same prefix,
            // if not declare in current depth map (the first of list)
            // and call contentHandler.startPrefixMapping(prefix, uri);
            boolean isNew = true;
            for (Iterator iter = nsStack.iterator(); iter.hasNext();) {
                prefixUriMap = (Map) iter.next();
                if (prefixUriMap.containsKey(prefix)) {
                    if (uri.equals(prefixUriMap.get(prefix))) {
                        // Its an active namespace already
                        // System.out.println(">>>"+XMLOutput.this.hashCode()+">NamespaceStack.pushNamespace() IS NOT NEW prefix="+prefix+",uri="+uri);
                        isNew = false;
                    }
                    // We found it in stack
                    // If it was exactly the same, we won't bother
                    break;
                }
            }

            if (isNew) {
                // not declared sometime before
                prefixUriMap = (Map) nsStack.get(0); // Current depth map
                // Sanity check: Don't let two prefixes for different uris in
                // same depth
                if (prefixUriMap.containsKey(prefix)) {
                    if (!uri.equals(prefixUriMap.get(prefix))) {
                        throw new SAXException("Cannot set same prefix to different URI in same node: trying to add prefix \""
                                + prefix + "\" for uri \""+uri+"\" whereas the declared ones are " + prefixUriMap);
                    }
                } else {
                    prefixUriMap.put(prefix, uri);

                    // To avoid setting xmlns="" for top node (not very nice :D)
                    // We need to specifically check this condition
                    if (!isRootNodeDefaultNs(prefix, uri)) {
//                        System.out.println(">>>"+XMLOutput.this.hashCode()+">NamespaceStack.pushNamespace() prefix="+prefix+",uri="+uri);
                        contentHandler.startPrefixMapping(prefix, uri);
                    }
                }
            }
        }