final EncodingFilter filter = new EncodingFilter();
        Map<String, String[]> paramMap;

        paramMap = filter.parseQueryString("a=", "UTF-8");
        assertEquals(1, paramMap.size());
        assertEquals("", paramMap.get("a")[0]);

        paramMap = filter.parseQueryString("a", "UTF-8");
        assertEquals(1, paramMap.size());
        assertEquals("", paramMap.get("a")[0]);

			return nil, err
		}
		if listenerTyped.Name == model.VirtualInboundListenerName {
			for _, filterChain := range listenerTyped.FilterChains {
				for _, filter := range filterChain.Filters {
					hcm := &hcm.HttpConnectionManager{}
					if err := filter.GetTypedConfig().UnmarshalTo(hcm); err == nil {
						return hcm, nil
					}
				}
			}
		}

}

func (r Rule) validateFilter() error {
	return r.Filter.Validate()
}

// Prefix - a rule can either have prefix under <filter></filter> or under
// <filter><and></and></filter>. This method returns the prefix from the
// location where it is available
func (r Rule) Prefix() string {
	if r.Filter.Prefix != "" {
		return r.Filter.Prefix
	}
	return r.Filter.And.Prefix
}

            return;
        }
        String filter = subRoleSet.stream().map(s -> String.format(groupFilter, s)).collect(Collectors.joining());
        if (subRoleSet.size() > 1) {
            filter = "(|" + filter + ")";
        }

        if (logger.isDebugEnabled()) {
            logger.debug("Group Filter: {}", filter);
        }
        search(bindDn, filter, null, () -> ldapUser.getEnvironment(), result -> {

  <artifactId>b</artifactId>
  <version>1.0</version>

    <build>
        <filters>
            <filter>src/main/filters/a.properties</filter>
            <filter>src/main/filters/c.properties</filter>
            <filter>src/main/filters/b.properties</filter>
            <filter>src/main/filters/d.properties</filter>
        </filters>
    </build>

	dataCase1 := []byte(`
<QueueConfiguration>
   <Id>1</Id>
   <Filter></Filter>
   <Queue>arn:minio:sqs:us-east-1:1:webhook</Queue>
   <Event>s3:ObjectAccessed:*</Event>
   <Event>s3:ObjectCreated:*</Event>
   <Event>s3:ObjectRemoved:*</Event>
</QueueConfiguration>`)

	dataCase2 := []byte(`
<QueueConfiguration>
   <Id>1</Id>
    <Filter>
        <S3Key>
            <FilterRule>

			outputFormat: "json",
			filter:       EndpointFilter{},
		},
		{
			name:         "emptyfilter",
			outputFormat: "yaml",
			filter:       EndpointFilter{},
		},
		{
			name:         "portfilter",
			outputFormat: "json",
			filter: EndpointFilter{
				Port: 8080,
			},
		},
		{
			name:         "portfilter",
			outputFormat: "yaml",
			filter: EndpointFilter{
				Port: 8080,
			},
		},
	}

        this.defaultOperator = defaultOperator;
    }

    public void addFilter(final Filter filter) {
        filterList.add(filter);
        createFilterChain();
    }

    protected void createFilterChain() {
        FilterChain chain = createDefaultFilterChain();
        for (final Filter element : filterList) {
            chain = appendFilterChain(element, chain);
        }
        filterChain = chain;

        setSystemProperty(Constants.LDAP_ACCOUNT_FILTER, value);
    }

    default String getLdapAccountFilter() {
        return getSystemProperty(Constants.LDAP_ACCOUNT_FILTER);
    }

    default void setLdapGroupFilter(final String value) {
        setSystemProperty(Constants.LDAP_GROUP_FILTER, value);
    }

    default String getLdapGroupFilter() {

	                    </Rule>`,
			expectedErr: errInvalidRuleID,
		},
		{ // Rule with empty ID
			inputXML: `<Rule>
							<ID></ID>
							<Filter><Prefix></Prefix></Filter>
							<Expiration>
								<Days>365</Days>
							</Expiration>
                            <Status>Enabled</Status>
	                    </Rule>`,
			expectedErr: nil,
		},