public void visit()

in src/main/java/org/apache/sling/scripting/jsp/jasper/compiler/Generator.java [1631:1770]
123 lines of code
22 McCabe index (conditional complexity)

        public void visit(Node.CustomTag n) throws JasperException {

            // Use plugin to generate more efficient code if there is one.
            if (n.useTagPlugin()) {
                generateTagPlugin(n);
                return;
            }

            TagHandlerInfo handlerInfo = getTagHandlerInfo(n);

            // Create variable names
            String baseVar = createTagVarName(n.getQName(), n.getPrefix(), n
                    .getLocalName());
            String tagEvalVar = "_jspx_eval_" + baseVar;
            String tagHandlerVar = "_jspx_th_" + baseVar;
            String tagPushBodyCountVar = "_jspx_push_body_count_" + baseVar;

            // If the tag contains no scripting element, generate its codes
            // to a method.
            ServletWriter outSave = null;
            Node.ChildInfo ci = n.getChildInfo();
            if (ci.isScriptless() && !ci.hasScriptingVars()) {
                // The tag handler and its body code can reside in a separate
                // method if it is scriptless and does not have any scripting
                // variable defined.

                String tagMethod = "_jspx_meth_" + baseVar;

                // Generate a call to this method
                out.printin("if (");
                out.print(tagMethod);
                out.print("(");
                if (parent != null) {
                    out.print(parent);
                    out.print(", ");
                }
                out.print("_jspx_page_context");
                if (pushBodyCountVar != null) {
                    out.print(", ");
                    out.print(pushBodyCountVar);
                }
                out.println("))");
                out.pushIndent();
                out.printil((methodNesting > 0) ? "return true;" : "return;");
                out.popIndent();

                // Set up new buffer for the method
                outSave = out;
                /*
                 * For fragments, their bodies will be generated in fragment
                 * helper classes, and the Java line adjustments will be done
                 * there, hence they are set to null here to avoid double
                 * adjustments.
                 */
                GenBuffer genBuffer = new GenBuffer(n,
                        n.implementsSimpleTag() ? null : n.getBody());
                methodsBuffered.add(genBuffer);
                out = genBuffer.getOut();

                methodNesting++;
                // Generate code for method declaration
                out.println();
                out.pushIndent();
                out.printin("private boolean ");
                out.print(tagMethod);
                out.print("(");
                if (parent != null) {
                    out.print("javax.servlet.jsp.tagext.JspTag ");
                    out.print(parent);
                    out.print(", ");
                }
                out.print("PageContext _jspx_page_context");
                if (pushBodyCountVar != null) {
                    out.print(", int[] ");
                    out.print(pushBodyCountVar);
                }
                out.println(")");
                out.printil("        throws Throwable {");
                out.pushIndent();

                // Initilaize local variables used in this method.
                if (!isTagFile) {
                    out
                            .printil("PageContext pageContext = _jspx_page_context;");
                }
                out.printil("JspWriter out = _jspx_page_context.getOut();");
                generateLocalVariables(out, n);
            }

            if (n.implementsSimpleTag()) {
                generateCustomDoTag(n, handlerInfo, tagHandlerVar);
            } else {
                /*
                 * Classic tag handler: Generate code for start element, body,
                 * and end element
                 */
                generateCustomStart(n, handlerInfo, tagHandlerVar, tagEvalVar,
                        tagPushBodyCountVar);

                // visit body
                String tmpParent = parent;
                parent = tagHandlerVar;
                boolean isSimpleTagParentSave = isSimpleTagParent;
                isSimpleTagParent = false;
                String tmpPushBodyCountVar = null;
                if (n.implementsTryCatchFinally()) {
                    tmpPushBodyCountVar = pushBodyCountVar;
                    pushBodyCountVar = tagPushBodyCountVar;
                }
                boolean tmpIsSimpleTagHandler = isSimpleTagHandler;
                isSimpleTagHandler = false;

                visitBody(n);

                parent = tmpParent;
                isSimpleTagParent = isSimpleTagParentSave;
                if (n.implementsTryCatchFinally()) {
                    pushBodyCountVar = tmpPushBodyCountVar;
                }
                isSimpleTagHandler = tmpIsSimpleTagHandler;

                generateCustomEnd(n, tagHandlerVar, tagEvalVar,
                        tagPushBodyCountVar);
            }

            if (ci.isScriptless() && !ci.hasScriptingVars()) {
                // Generate end of method
                if (methodNesting > 0) {
                    out.printil("return false;");
                }
                out.popIndent();
                out.printil("}");
                out.popIndent();

                methodNesting--;

                // restore previous writer
                out = outSave;
            }
        }