private String evaluateAttribute()

in src/main/java/org/apache/sling/scripting/jsp/jasper/compiler/Generator.java [2758:2915]
132 lines of code
29 McCabe index (conditional complexity)

        private String evaluateAttribute(TagHandlerInfo handlerInfo,
                Node.JspAttribute attr, Node.CustomTag n, String tagHandlerVar)
                throws JasperException {

            String attrValue = attr.getValue();
            if (attrValue == null) {
                if (attr.isNamedAttribute()) {
                    if (n.checkIfAttributeIsJspFragment(attr.getName())) {
                        // XXX - no need to generate temporary variable here
                        attrValue = generateNamedAttributeJspFragment(attr
                                .getNamedAttributeNode(), tagHandlerVar);
                    } else {
                        attrValue = generateNamedAttributeValue(attr
                                .getNamedAttributeNode());
                    }
                } else {
                    return null;
                }
            }

            String localName = attr.getLocalName();

            Method m = null;
            Class[] c = null;
            if (attr.isDynamic()) {
                c = OBJECT_CLASS;
            } else {
                m = handlerInfo.getSetterMethod(localName);
                if (m == null) {
                    err.jspError(n, "jsp.error.unable.to_find_method", attr
                            .getName());
                }
                c = m.getParameterTypes();
                // XXX assert(c.length > 0)
            }

            if (attr.isExpression()) {
                // Do nothing
            } else if (attr.isNamedAttribute()) {
                if (!n.checkIfAttributeIsJspFragment(attr.getName())
                        && !attr.isDynamic()) {
                    attrValue = convertString(c[0], attrValue, localName,
                            handlerInfo.getPropertyEditorClass(localName), true);
                }
            } else if (attr.isELInterpreterInput()) {

                // results buffer
                StringBuffer sb = new StringBuffer(64);

                TagAttributeInfo tai = attr.getTagAttributeInfo();

                // generate elContext reference
                sb.append(getJspContextVar());
                sb.append(".getELContext()");
                String elContext = sb.toString();
                if (attr.getEL() != null && attr.getEL().getMapName() != null) {
                    sb.setLength(0);
                    sb.append("new org.apache.sling.scripting.jsp.jasper.el.ELContextWrapper(");
                    sb.append(elContext);
                    sb.append(',');
                    sb.append(attr.getEL().getMapName());
                    sb.append(')');
                    elContext = sb.toString();
                }

                // reset buffer
                sb.setLength(0);

                // create our mark
                sb.append(n.getStart().toString());
                sb.append(" '");
                sb.append(attrValue);
                sb.append('\'');
                String mark = sb.toString();

                // reset buffer
                sb.setLength(0);

                // depending on type
                if (attr.isDeferredInput()
                        || ((tai != null) && ValueExpression.class.getName().equals(tai.getTypeName()))) {
                    sb.append("new org.apache.sling.scripting.jsp.jasper.el.JspValueExpression(");
                    sb.append(quote(mark));
                    sb.append(',');
                    sb.append(getExpressionFactoryVar());
                    sb.append(".createValueExpression(");
                    if (attr.getEL() != null) { // optimize
                        sb.append(elContext);
                        sb.append(',');
                    }
                    sb.append(quote(attrValue));
                    sb.append(',');
                    sb.append(JspUtil.toJavaSourceTypeFromTld(attr.getExpectedTypeName()));
                    sb.append("))");
                    // should the expression be evaluated before passing to
                    // the setter?
                    boolean evaluate = false;
                    if (tai.canBeRequestTime()) {
                        evaluate = true; // JSP.2.3.2
                    }
                    if (attr.isDeferredInput()) {
                        evaluate = false; // JSP.2.3.3
                    }
                    if (attr.isDeferredInput() && tai.canBeRequestTime()) {
                        evaluate = !attrValue.contains("#{"); // JSP.2.3.5
                    }
                    if (evaluate) {
                        sb.append(".getValue(");
                        sb.append(getJspContextVar());
                        sb.append(".getELContext()");
                        sb.append(")");
                    }
                    attrValue = sb.toString();
                } else if (attr.isDeferredMethodInput()
                        || ((tai != null) && MethodExpression.class.getName().equals(tai.getTypeName()))) {
                    sb.append("new org.apache.sling.scripting.jsp.jasper.el.JspMethodExpression(");
                    sb.append(quote(mark));
                    sb.append(',');
                    sb.append(getExpressionFactoryVar());
                    sb.append(".createMethodExpression(");
                    sb.append(elContext);
                    sb.append(',');
                    sb.append(quote(attrValue));
                    sb.append(',');
                    sb.append(JspUtil.toJavaSourceTypeFromTld(attr.getExpectedTypeName()));
                    sb.append(',');
                    sb.append("new Class[] {");

                    String[] p = attr.getParameterTypeNames();
                    for (int i = 0; i < p.length; i++) {
                        sb.append(JspUtil.toJavaSourceTypeFromTld(p[i]));
                        sb.append(',');
                    }
                    if (p.length > 0) {
                        sb.setLength(sb.length() - 1);
                    }

                    sb.append("}))");
                    attrValue = sb.toString();
                } else {
                    // run attrValue through the expression interpreter
                    boolean replaceESC = attrValue.indexOf(Constants.ESC) > 0;
                    String mapName = (attr.getEL() != null) ? attr.getEL()
                            .getMapName() : null;
                    attrValue = JspUtil.interpreterCall(this.isTagFile,
                            attrValue, c[0], mapName, false);
                    // XXX hack: Replace ESC with '$'
                    if (replaceESC) {
                        attrValue = "(" + attrValue + ").replace("
                                + Constants.ESCStr + ", '$')";
                    }
                }
            } else {
                attrValue = convertString(c[0], attrValue, localName,
                        handlerInfo.getPropertyEditorClass(localName), false);
            }
            return attrValue;
        }