Examples of com.hellblazer.slp.Filter

com.hellblazer.slp.Filter
etf.org/rfc/rfc1960.txt). It should be noted that RFC 2254: A String Representation of LDAP Search Filters (available at http://www.ietf.org/rfc/rfc2254.txt) supersedes RFC 1960 but only adds extensible matching and is not applicable for this API.
The string representation of an LDAP search filter is defined by the following grammar. It uses a prefix format.
```
 <filter> ::= '(' <filtercomp> ')' <filtercomp> ::= <and> | <or> | <not> | <item> <and> ::= '&' <filterlist> <or> ::= '|' <filterlist> <not> ::= '!' <filter> <filterlist> ::= <filter> | <filter> <filterlist> <item> ::= <simple> | <present> | <substring> <simple> ::= <attr> <filtertype> <value> <filtertype> ::= <equal> | <approx> | <greater> | <less> <equal> ::= '=' <approx> ::= '~=' <greater> ::= '>=' <less> ::= '<=' <present> ::= <attr> '=*' <substring> ::= <attr> '=' <initial> <any> <final> <initial> ::= NULL | <value> <any> ::= '*' <starval> <starval> ::= NULL | <value> '*' <starval> <final> ::= NULL | <value> 
```
<attr> is a string representing an attribute, or key, in the properties objects of the registered services. Attribute names are not case sensitive; that is cn and CN both refer to the same attribute. <value> is a string representing the value, or part of one, of a key in the properties objects of the registered services. If a <value> must contain one of the characters '* ' or '(' or ')', these characters should be escaped by preceding them with the backslash '\' character. Note that although both the <substring> and <present> productions can produce the 'attr=*' construct, this construct is used only to denote a presence filter.
Examples of LDAP filters are:
```
 "(cn=Babs Jensen)" "(!(cn=Tim Howes))" "(&(" + Constants.OBJECTCLASS + "=Person)(|(sn=Jensen)(cn=Babs J*)))" "(o=univ*of*mich*)" 
```
The approximate match (~=) is implementation specific but should at least ignore case and white space differences. Optional are codes like soundex or other smart "closeness" comparisons.
Comparison of values is not always straightforward. Strings are compared differently than numbers and it is possible for a key to have multiple values. Note that that he comparison is defined by the String comparison rules.

                                                                                throws InvalidSyntaxException {
        if (log.isTraceEnabled()) {
            log.trace("adding listener: " + listener + " on query: " + query);
        }
        List<ServiceReference> references;
        listeners.add(new ListenerRegistration(listener, new Filter(query)));
        references = getServiceReferences(null, query);
        for (ServiceReference reference : references) {
            final ServiceReference ref = reference;
            executor.execute(new Runnable() {
                @Override

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    public ServiceReference getServiceReference(String serviceType)
                                                                   throws InvalidSyntaxException {
        if (serviceType == null) {
            serviceType = "*";
        }
        Filter filter = new Filter("(" + SERVICE_TYPE + "=" + serviceType + ")");
        for (ServiceReference ref : services.values()) {
            if (filter.match(ref)) {
                return ref;
            }
        }
        return null;
    }

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                                                       String query)
                                                                    throws InvalidSyntaxException {
        if (serviceType == null) {
            serviceType = "*";
        }
        Filter filter;
        if (query == null) {
            filter = new Filter(String.format("(%s=%s)", SERVICE_TYPE,
                                              serviceType));
        } else {
            filter = new Filter(String.format("(&(%s=%s) %s)", SERVICE_TYPE,
                                              serviceType, query));
        }
        ArrayList<ServiceReference> references = new ArrayList<ServiceReference>();
        for (Map.Entry<UUID, ServiceReferenceImpl> entry : services.entrySet()) {
            if (filter.match(entry.getValue())) {
                references.add(entry.getValue());
            }
        }
        return references;
    }

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     * @see com.hellblazer.slp.ServiceScope#removeServiceListener(com.hellblazer.slp.ServiceListener, java.lang.String)
     */
    @Override
    public void removeServiceListener(ServiceListener listener, String query)
                                                                             throws InvalidSyntaxException {
        listeners.remove(new ListenerRegistration(listener, new Filter(query)));
    }

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