public int size() {
        return map.size();
    }

    /**
     * Returns true if this set contains no elements.
     *
     * @return true if this set contains no elements.
     */
    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    /**
     * Returns true if this set contains the specified element.
     *
     * @param o

            builder.startObject();
            if (fieldSet.contains(CLUSTER_NAME)) {
                builder.field(CLUSTER_NAME, response.getClusterName());
            }
            if (fieldSet.contains(STATUS)) {
                builder.field(STATUS, response.getStatus().name().toLowerCase(Locale.ROOT));
            }
            if (fieldSet.contains(TIMED_OUT)) {
                builder.field(TIMED_OUT, response.isTimedOut());

                final String webPackageKeyword = getWebPackageKeyword();
                if (!clazz.getName().contains(webPackageKeyword) ||
                // exclude app.web.api.admin packages
                        clazz.getName().contains(".app.web.api.admin.")) {
                    return;
                }
                check(srcFile, clazz, webPackageKeyword);
            }
        });

        assertEscapePattern("\\Qsmb://server/test/\\E.*", "smb://server/test/");
        assertEscapePattern(".*\\Q?\\E.*", "contains:?");
        assertEscapePattern(".*\\Q\001\\E.*", "contains:\001");
        assertEscapePattern("(?i).*\\.exe$", "regexpIgnoreCase:\\.exe$");
        assertEscapePattern("(?i)index.html", "regexpIgnoreCase:index.html");

        dynamicProperties.checkInterval = checkInterval;
        return dynamicProperties;
    }

    @Override
    public boolean contains(final Object value) {
        return getProperties().contains(value);
    }

    @Override
    public boolean containsKey(final Object key) {
        return getProperties().containsKey(key);
    }

    @Override

            if (clazz.isInterface() || Modifier.isAbstract(clazz.getModifiers())) { // e.g. BaseAction
                return;
            }
            final String className = clazz.getName();
            if (className.contains(appWebPkg) && className.endsWith(actionSuffix)) {
                // ## Assert ##
                markHere("exists");
                getComponent(clazz); // expect no exception
            }
        });

    }

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public boolean isEmpty() {
        return map.isEmpty();
    }

    @Override
    public boolean contains(final Object o) {
        return map.containsKey(o);
    }

    @Override
    public boolean add(final String o) {
        return map.put(o, PRESENT) == null;
    }

    @Override

        assertThat(set.size(), is(2));
        assertThat(set.contains(ResultPrinter.class.getName()), is(true));
        assertThat(set.contains(TestRunner.class.getName()), is(true));
        assertThat(set.contains("junit.textui.package-info"), is(false));
        assertThat(set.contains(junit.extensions.TestDecorator.class.getName()), is(not(true)));
    }

            if (logger.isDebugEnabled()) {
                logger.debug("container was destroyed.");
            }
            return;
        } catch (final Exception e) {
            if (!ComponentUtil.available()) {
                if (logger.isDebugEnabled()) {
                    logger.debug("container was destroyed.");
                }
                return;
            }

Fess also contains a Crawler, which can crawl documents on a [web server](https://fess.codelibs.org/14.12/admin/webconfig-guide.html), [file system](https://fess.codelibs.org/14.12/admin/fileconfig-guide.html), or [Data Store](https://fess.codelibs.org/14.12/admin...