private static final String SHA1_PROPERTY = "sha1";

    private static final String CHANGELIST_PROPERTY = "changelist";

    private static final String REVISION_PROPERTY = "revision";

    @Override
    public boolean isValidProperty(String property) {
        return REVISION_PROPERTY.equals(property)
                || CHANGELIST_PROPERTY.equals(property)
                || SHA1_PROPERTY.equals(property);
    }

    /**
     * Get the value of property as {@link String}.
     * @param propertyKey The key of the property. (NotNull)
     * @return The value of found property. (NotNull: if not found, exception)
     * @throws ConfigPropertyNotFoundException When the property is not found.
     */
    String get(String propertyKey);

    /**
     * Is the property true?

    companion object {
      const val PROPERTY_NAME = "okhttp.platform"
      const val CONSCRYPT_PROPERTY = "conscrypt"
      const val CORRETTO_PROPERTY = "corretto"
      const val JDK9_PROPERTY = "jdk9"
      const val JDK8_ALPN_PROPERTY = "jdk8alpn"
      const val JDK8_PROPERTY = "jdk8"
      const val OPENJSSE_PROPERTY = "openjsse"
      const val BOUNCYCASTLE_PROPERTY = "bouncycastle"
      const val LOOM_PROPERTY = "loom"

<project name="dbflute" basedir=".">
	<property name="mydbflute.dir" value="${basedir}/mydbflute" />
	<property name="target.dir" value="${basedir}/target" />
	<property name="branch.name" value="fess-14.13" />
	<property name="mydbflute.url" value="https://github.com/lastaflute/lastaflute-example-waterfront/archive/${branch.name}.zip" />

	<target name="mydbflute.check">
		<condition property="mydbflute.exists">

    private static final String KEY_PROPERTY = "name";

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override
    protected String getListEndpointSuffix() {

    public static final String CRAWLING_USER_AGENT_PROPERTY = "crawling.user.agent";

    public static final String DAY_FOR_CLEANUP_PROPERTY = "day.for.cleanup";

    public static final String WEB_API_JSON_PROPERTY = "web.api.json";

    public static final String WEB_API_SUGGEST_PROPERTY = "web.api.suggest";

    public static final String WEB_API_GSA_PROPERTY = "web.api.gsa";

<?xml version="1.0" encoding="UTF-8"?>
<project name="deps" basedir=".">
	<property name="target.dir" value="${basedir}/target/deps" />
	<property name="webinf.dir" value="${basedir}/src/main/webapp/WEB-INF" />
	<property name="crawler.dir" value="${basedir}/src/main/webapp/WEB-INF/env/crawler" />
	<property name="suggest.dir" value="${basedir}/src/main/webapp/WEB-INF/env/suggest" />
	<property name="thumbnail.dir" value="${basedir}/src/main/webapp/WEB-INF/env/thumbnail" />

        if (StringUtil.isNotBlank(proxyHost) && StringUtil.isNotBlank(proxyPort)) {
            factoryParamMap.put(HcHttpClient.PROXY_HOST_PROPERTY, proxyHost);
            factoryParamMap.put(HcHttpClient.PROXY_PORT_PROPERTY, proxyPort);
            final String proxyUsername = paramMap.get(CRAWLER_WEB_PREFIX + "proxyUsername");

    private static final String KEY_PROPERTY = "term";

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override
    protected String getListEndpointSuffix() {

    private static final String KEY_PROPERTY = "url_expr";

    @Override
    protected String getNamePrefix() {
        return NAME_PREFIX;
    }

    @Override
    protected String getApiPath() {
        return API_PATH;
    }

    @Override
    protected String getKeyProperty() {
        return KEY_PROPERTY;
    }

    @Override