protected Object getAttribute()

in src/main/java/org/apache/commons/jexl3/internal/InterpreterBase.java [971:1023]
48 lines of code
18 McCabe index (conditional complexity)

    protected Object getAttribute(final Object object, final Object attribute, final JexlNode node) {
        if (object == null) {
            throw new JexlException(node, "object is null");
        }
        cancelCheck(node);
        final JexlOperator operator = node != null && node.jjtGetParent() instanceof ASTArrayAccess
                ? JexlOperator.ARRAY_GET : JexlOperator.PROPERTY_GET;
        final Object result = operators.tryOverload(node, operator, object, attribute);
        if (result != JexlEngine.TRY_FAILED) {
            return result;
        }
        Exception xcause = null;
        try {
            // attempt to reuse last executor cached in volatile JexlNode.value
            if (node != null && cache) {
                final Object cached = node.jjtGetValue();
                if (cached instanceof JexlPropertyGet) {
                    final JexlPropertyGet vg = (JexlPropertyGet) cached;
                    final Object value = vg.tryInvoke(object, attribute);
                    if (!vg.tryFailed(value)) {
                        return value;
                    }
                }
            }
            // resolve that property
            final List<JexlUberspect.PropertyResolver> resolvers = uberspect.getResolvers(operator, object);
            final JexlPropertyGet vg = uberspect.getPropertyGet(resolvers, object, attribute);
            if (vg != null) {
                final Object value = vg.invoke(object);
                // cache executor in volatile JexlNode.value
                if (node != null && cache && vg.isCacheable()) {
                    node.jjtSetValue(vg);
                }
                return value;
            }
        } catch (final Exception xany) {
            xcause = xany;
        }
        // lets fail
        if (node == null) {
            // direct call
            final String error = "unable to get object property"
                    + ", class: " + object.getClass().getName()
                    + ", property: " + attribute;
            throw new UnsupportedOperationException(error, xcause);
        }
        final boolean safe = (node instanceof ASTIdentifierAccess) && ((ASTIdentifierAccess) node).isSafe();
        if (safe) {
            return null;
        }
        final String attrStr = attribute != null ? attribute.toString() : null;
        return unsolvableProperty(node, attrStr, true, xcause);
    }