public AggregateNode(VariableResolver element,
    VariableResolver nsURI,
    VariableResolver nsPrefix) 
{
        this.element = element;
        this.nsURI = nsURI;
        this.nsPrefix = nsPrefix;
}

 public boolean invoke(Environment env,
    InvokeContext context) throws Exception 
{
        final boolean infoEnabled = getLogger().isInfoEnabled();
        Map objectModel = env.getObjectModel();
        // Setup aggregator
        ProcessingPipeline processingPipeline = context.getProcessingPipeline();
        processingPipeline.setGenerator("< aggregator >", null, Parameters.EMPTY_PARAMETERS, Parameters.EMPTY_PARAMETERS);
        ContentAggregator aggregator = (ContentAggregator) processingPipeline.getGenerator();
        aggregator.setRootElement(this.element.resolve(context, objectModel),
                                  this.nsURI.resolve(context, objectModel),
                                  this.nsPrefix.resolve(context, objectModel));
        // Get actual parts, potentially filtered by the view
        Part[] actualParts;
        String cocoonView = env.getView();
        if (cocoonView == null) {
            // Keep all parts
            actualParts = this.allParts;
        } else {
            // Are there some parts that match this view ?
            actualParts = (Part[])this.viewParts.get(cocoonView);
            // If not, keep all parts
            if (actualParts == null) {
                actualParts = this.allParts;
            }
        }
        // Add parts
        for (int i = 0; i <  actualParts.length; i++) {
            Part part = actualParts[i];
            if (part != null) {
                aggregator.addPart(
                    part.source.resolve(context, objectModel),
                    part.element.resolve(context, objectModel),
                    part.nsURI.resolve(context, objectModel),
                    part.stripRoot.resolve(context, objectModel),
                    part.nsPrefix.resolve(context, objectModel)
                );
            }
        }
        // Bug #7196 : Some parts matched the view: jump to that view
        if (actualParts != this.allParts) {
            ProcessingNode viewNode = (ProcessingNode)this.viewNodes.get(cocoonView);
            if (viewNode != null) {
                if (infoEnabled) {
                    getLogger().info("Jumping to view '" + cocoonView + "' from aggregate part at " + this.getLocation());
                }
                return viewNode.invoke(env, context);
            }
        }
        // Check aggregate-level view
        if (cocoonView != null && this.viewNodes != null) {
            ProcessingNode viewNode = (ProcessingNode)this.viewNodes.get(cocoonView);
            if (viewNode != null) {
                if (infoEnabled) {
                    getLogger().info("Jumping to view '" + cocoonView + "' from aggregate at " + this.getLocation());
                }
                return viewNode.invoke(env, context);
            }
        }
        // Return false to continue sitemap invocation
        return false;
}

 public  void setParts(AggregateNode.Part[] allParts,
    Map viewParts) 
{
        this.allParts = allParts;
        this.viewParts = viewParts;
}

 public  void setViewNodes(Map viewNodes) 
{
        this.viewNodes = viewNodes;
}