public void doTag()

in jelly-tags/xml/src/main/java/org/apache/commons/jelly/tags/xml/SetTag.java [80:174]
81 lines of code
27 McCabe index (conditional complexity)

    public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
        if (var == null) {
            throw new MissingAttributeException( "var" );
        }
        if (select == null) {
            throw new MissingAttributeException( "select" );
        }

        Object xpathContext = getXPathContext();
        Object value = null;
        try {
            if ( single != null && single.booleanValue() == true ) {
                value = select.selectSingleNode(xpathContext);
            } else {
                value = select.evaluate(xpathContext);
            }
        }
        catch (JaxenException e) {
            throw new JellyTagException(e);
        }
        
        if (value instanceof List) {
            List list = (List) value;
            // sort the list if xpCmp is set.
            if (xpCmp != null && (xpCmp.getXpath() != null)) {
                Collections.sort(list, xpCmp);
            }
            if (list.isEmpty()) {
                value = null;
            }
        }
        

        // handle single
        if (single!=null) {
            if (single.booleanValue() == true) {
                if (value instanceof List) {
                    List l = (List) value;
                    if (l.isEmpty())
                        value=null;
                    else
                        value=l.get(0);
                }
            } else { // single == false
                if (! (value instanceof List) ) {
                    List l = null;
                    if (value==null) {
                        l = new ArrayList(0);
                    } else {
                        l = new ArrayList(1);
                        l.add(value);
                    }
                    value = l;
                }
            }
        }
        
        // now convert the result(s) to string if need
        if (asString != null && asString.booleanValue()) {
            if (value instanceof Node) {
                value = ((Node) value).getStringValue();
            } else if (value instanceof List) {
                for(ListIterator it = ((List) value).listIterator(); it.hasNext(); ) {
                    Object v = it.next();
                    if (v instanceof Node) {
                        v = ((Node) v).getStringValue();
                        it.set(v);
                    }
                }
            }
        }
        
        // finally convert the result to a concatenated string if delimiter is defined
        if (delimiter != null && value instanceof List) {
            StringBuilder buff = new StringBuilder();
            for(Iterator it = ((List) value).iterator(); it.hasNext(); ) {
                Object v = it.next();
                if (v instanceof Node) {
                    buff.append( ((Node) v).getStringValue());
                } else {
                    buff.append(v.toString());
                }
                if (it.hasNext()) {
                    buff.append(delimiter);
                }
            }
            buff.setLength(buff.length());
            value = buff.toString();
        }
        

        //log.info( "Evaluated xpath: " + select + " as: " + value + " of type: " + value.getClass().getName() );

        context.setVariable(var, value);
    }