private DefaultMemberAccessPolicy()

in freemarker-core/src/main/java/freemarker/ext/beans/DefaultMemberAccessPolicy.java [66:159]
87 lines of code
26 McCabe index (conditional complexity)

    private DefaultMemberAccessPolicy() {
        try {
            ClassLoader classLoader = DefaultMemberAccessPolicy.class.getClassLoader();

            whitelistRuleFinalClasses = new HashSet<>();
            whitelistRuleNonFinalClasses = new HashSet<>();
            Set<Class<?>> typesWithBlacklistUnlistedRule = new HashSet<>();
            List<MemberSelector> whitelistMemberSelectors = new ArrayList<>();
            for (String line : loadMemberSelectorFileLines()) {
                line = line.trim();
                if (!MemberSelector.isIgnoredLine(line)) {
                    if (line.startsWith("@")) {
                        String[] lineParts = line.split("\\s+");
                        if (lineParts.length != 2) {
                            throw new IllegalStateException("Malformed @ line: " + line);
                        }
                        String typeName = lineParts[1];
                        Class<?> upperBoundType;
                        try {
                            upperBoundType = classLoader.loadClass(typeName);
                        } catch (ClassNotFoundException e) {
                            upperBoundType = null;
                        }
                        String rule = lineParts[0].substring(1);
                        if (rule.equals("whitelistPolicyIfAssignable")) {
                            if (upperBoundType != null) {
                                Set<Class<?>> targetSet =
                                        (upperBoundType.getModifiers() & Modifier.FINAL) != 0
                                                ? whitelistRuleFinalClasses
                                                : whitelistRuleNonFinalClasses;
                                targetSet.add(upperBoundType);
                            }
                        } else if (rule.equals("blacklistUnlistedMembers")) {
                            if (upperBoundType != null) {
                                typesWithBlacklistUnlistedRule.add(upperBoundType);
                            }
                        } else {
                            throw new IllegalStateException("Unhandled rule: " + rule);
                        }
                    } else {
                        MemberSelector memberSelector;
                        try {
                            memberSelector = MemberSelector.parse(line, classLoader);
                        } catch (ClassNotFoundException | NoSuchMethodException | NoSuchFieldException e) {
                            // Can happen if we run on an older Java than the list was made for
                            memberSelector = null;
                        }
                        if (memberSelector != null) {
                            Class<?> upperBoundType = memberSelector.getUpperBoundType();
                            if (upperBoundType != null) {
                                if (!whitelistRuleFinalClasses.contains(upperBoundType)
                                        && !whitelistRuleNonFinalClasses.contains(upperBoundType)
                                        && !typesWithBlacklistUnlistedRule.contains(upperBoundType)) {
                                    throw new IllegalStateException("Type without rule: " + upperBoundType.getName());
                                }
                                // We always do the same, as "blacklistUnlistedMembers" is also defined via a whitelist:
                                whitelistMemberSelectors.add(memberSelector);
                            }
                        }
                    }
                }
            }

            whitelistMemberAccessPolicy = new WhitelistMemberAccessPolicy(whitelistMemberSelectors);

            // Generate blacklists based on the whitelist and the members of "blacklistUnlistedMembers" types:
            List<MemberSelector> blacklistMemberSelectors = new ArrayList<>();
            for (Class<?> blacklistUnlistedRuleType : typesWithBlacklistUnlistedRule) {
                ClassMemberAccessPolicy classPolicy = whitelistMemberAccessPolicy.forClass(blacklistUnlistedRuleType);
                for (Method method : blacklistUnlistedRuleType.getMethods()) {
                    if (!classPolicy.isMethodExposed(method)) {
                        blacklistMemberSelectors.add(new MemberSelector(blacklistUnlistedRuleType, method));
                    }
                }
                for (Constructor<?> constructor : blacklistUnlistedRuleType.getConstructors()) {
                    if (!classPolicy.isConstructorExposed(constructor)) {
                        blacklistMemberSelectors.add(new MemberSelector(blacklistUnlistedRuleType, constructor));
                    }
                }
                for (Field field : blacklistUnlistedRuleType.getFields()) {
                    if (!classPolicy.isFieldExposed(field)) {
                        blacklistMemberSelectors.add(new MemberSelector(blacklistUnlistedRuleType, field));
                    }
                }
            }
            blacklistMemberAccessPolicy = new BlacklistMemberAccessPolicy(blacklistMemberSelectors);

            toStringAlwaysExposed =
                    whitelistMemberAccessPolicy.isToStringAlwaysExposed()
                    && blacklistMemberAccessPolicy.isToStringAlwaysExposed();
        } catch (Exception e) {
            throw new IllegalStateException("Couldn't init " + this.getClass().getName() + " instance", e);
        }
    }