Examples of org.geoserver.ows.KvpParser

org.geoserver.ows.KvpParser
Parses a key-value pair into a key-object pair.
This class is intended to be subclassed. Subclasses need declare the key in which they parse, and the type of object they parse into.

Instances need to be declared in a spring context like the following:
```
  <bean id="myKvpParser" class="org.xzy.MyKvpParser"/>  
```
Where com.xzy.MyKvpParser could be something like:
```
  public class MyKvpParser extends KvpParser { public MyKvpParser() { super( "MyKvp", MyObject.class )l } public Object parse( String value ) { return new MyObject( value ); } }  
```
Operation Binding
In the normal case, a kvp parser is engaged when a request specifies a name which matches the name declared by the kvp parser. It is also possible to attach a kvp parser so that it only engages on a particular operation. This is done by declaring the one or more of the following:
- service
- version
- request
When a kvp parser declares one or more of these properties, it will only be engaged if an incoming request specicfies matching values of the properties.

The following bean declaration would create the above kvp parser so that it only engages when the service is "MyService", and the request is "MyRequest".
```
  <bean id="myKvpParser" class="org.xzy.MyKvpParser"> <property name="service">MyService</property> <property name="request">MyRequest</property> <bean>  
```
@author Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org

        //strip out parsers which do not match current service/request/version
        String service = (String) kvp.get( "service" );
        String version = (String) kvp.get( "version" );
        String request = (String) kvp.get( "request" );
        for (Iterator p = parsers.iterator(); p.hasNext(); ) {
            KvpParser parser = (KvpParser) p.next();
            
            if ( parser.getService() != null && !parser.getService().equalsIgnoreCase(service) ) {
                p.remove();
                continue;
            }
            
            if ( parser.getVersion() != null && !parser.getVersion().toString().equals(version) ) {
                p.remove();
                continue;
            }
            
            if ( parser.getRequest() != null && !parser.getRequest().equalsIgnoreCase(request) ) {
                p.remove();
            }
        }
        
        //parser the kvp's
        ArrayList<Throwable> errors = new ArrayList<Throwable>();
        for (Iterator itr = kvp.entrySet().iterator(); itr.hasNext();) {
            Map.Entry entry = (Map.Entry) itr.next();
            String key = (String) entry.getKey();
            String value = (String) entry.getValue();
            
            //find the parser for this key value pair
            Object parsed = null;


            for (Iterator pitr = parsers.iterator(); pitr.hasNext() && parsed == null;) {
                KvpParser parser = (KvpParser) pitr.next();


                if (key.equalsIgnoreCase(parser.getKey())) {
                    try {
                        parsed = parser.parse(value);
                    } catch (Throwable t) {
                        //dont throw any exceptions yet, befor the service is
                        // known
                        errors.add( t );
                    }

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            }


            Object parsed = null;


            for (Iterator p = parsers.iterator(); p.hasNext();) {
                KvpParser parser = (KvpParser) p.next();
                if ( key.equalsIgnoreCase( parser.getKey() ) ) {
                    parsed = parser.parse( raw );
                    if ( parsed != null ) {


                        break;
                    }
                }

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    }


    public Object parse(String value) throws Exception {
      List ret = new ArrayList();
        List parsers = GeoServerExtensions.extensions(KvpParser.class, applicationContext);
        KvpParser formatOptionsParser = null;
        for (Object o : parsers) {
            KvpParser parser = (KvpParser) o;
            if ( parser.getKey().equalsIgnoreCase("format_options") ) {
              formatOptionsParser = parser;
              break;
            }
        }
        if (formatOptionsParser == null) {

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    @Test
    public void testParserForVersion() throws Exception {
        // look up parser objects
        List<KvpParser> parsers = GeoServerExtensions.extensions(KvpParser.class);
        KvpParser parser = KvpUtils.findParser("interpolation", "WCS", null, "2.0.0", parsers);
        assertNotNull(parser);
        // Ensure the correct parser is taken
        assertEquals(parser.getClass(), InterpolationKvpParser.class);
        // Version 2.0.1
        parser = KvpUtils.findParser("interpolation", "WCS", null, "2.0.1", parsers);
        assertNotNull(parser);
        // Ensure the correct parser is taken
        assertEquals(parser.getClass(), InterpolationKvpParser.class);
    }

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        for (Iterator<Map.Entry<Object, Object>> itr = kvp.entrySet().iterator(); itr.hasNext();) {
            Map.Entry<Object, Object> entry = itr.next();
            String key = (String) entry.getKey();


            // find the parser for this key value pair
            KvpParser parser = findParser(key, service, request, version, parsers);


            // parse the value
            Object parsed = null;
            if (parser != null) {
                try {
                    if (entry.getValue() instanceof String) {
                        String value = (String) entry.getValue();
                        parsed = parser.parse(value);
                    } else {
                        String[] values = (String[]) entry.getValue();
                        List<Object> result = new ArrayList<Object>();
                        for (String v : values) {
                            result.add(parser.parse(v));
                        }
                        parsed = result;
                    }
                } catch (Throwable t) {
                    // dont throw any exceptions yet, befor the service is

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     * @param request the request parameter from the kvp (can be null)
     */
    public static void purgeParsers(List<KvpParser> parsers, final String service,
            final String version, final String request) {
        for (Iterator<KvpParser> p = parsers.iterator(); p.hasNext();) {
            KvpParser parser = p.next();


            if (parser.getService() != null && !parser.getService().equalsIgnoreCase(service)) {
                p.remove();
            } else if (parser.getVersion() != null
                    && !parser.getVersion().toString().equals(version)) {
                p.remove();
            } else if (parser.getRequest() != null
                    && !parser.getRequest().equalsIgnoreCase(request)) {
                p.remove();
            }
        }
    }

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     * @throws IllegalStateException if more than one candidate parser is found
     */
    public static KvpParser findParser(final String key, final String service,
            final String request, final String version, Collection<KvpParser> parsers) {
        // find the parser for this key value pair
        KvpParser parser = null;
        final Iterator<KvpParser> pitr = parsers.iterator();
        while (pitr.hasNext()) {
            KvpParser candidate = pitr.next();
            if (key.equalsIgnoreCase(candidate.getKey())) {
                if (parser == null) {
                    parser = candidate;
                } else {
                    // if target service matches, it is a closer match
                    String trgService = candidate.getService();
                    if (trgService != null && trgService.equalsIgnoreCase(service)) {
                        // determine if this parser more closely matches the request
                        String curService = parser.getService();
                        if (curService == null) {
                            parser = candidate;
                        } else {
                            // both match, filter by version
                            Version curVersion = parser.getVersion();
                            Version trgVersion = candidate.getVersion();
                            if (trgVersion != null) {
                                if (curVersion == null && trgVersion.toString().equals(version)) {
                                    parser = candidate;
                                }
                            } else {

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     * @throws IllegalStateException if more than one candidate parser is found
     */
    public static Object parseKey(final String key, final String value, final String service,
            final String request, final String version, List<KvpParser> parsers) throws Exception {
        // find the parser for this key value pair
        KvpParser parser = findParser(key, service, request, version, parsers);
        if (parser == null) {
            return null;
        }
        return parser.parse(value);
    }

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    @Test
    public void testParserForVersion() {
        // look up parser objects
        List<KvpParser> parsers = GeoServerExtensions.extensions(KvpParser.class);
        KvpParser parser = KvpUtils.findParser("interpolation", "WCS", null, "1.0.0", parsers);
        assertNotNull(parser);
        // Ensure the correct parser is taken
        assertEquals(parser.getClass(), InterpolationMethodKvpParser.class);
    }

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            String raw = kv.size() == 1 ? "true" : KvpUtils.unescape(kv.get(1));
               
            Object parsed = null;


            for (Iterator p = parsers.iterator(); p.hasNext();) {
                KvpParser parser = (KvpParser) p.next();
                if ( key.equalsIgnoreCase( parser.getKey() ) ) {
                    parsed = parser.parse( raw );
                    if ( parsed != null ) {


                        break;
                    }
                }

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Related Classes of org.geoserver.ows.KvpParser

org.geoserver.ows.kvp.FormatOptionsKvpParser

org.geoserver.ows.kvp.ViewParamsKvpParser

org.geoserver.ows.util.KvpUtils

org.geoserver.wcs.kvp.InterpolationParserTest

org.geoserver.wcs2_0.kvp.InterpolationKvpParserTest

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Examples of org.geoserver.ows.KvpParser

Operation Binding

Related Classes of org.geoserver.ows.KvpParser