Examples of org.apache.commons.collections.MultiHashMap

org.apache.commons.collections.MultiHashMap
MultiHashMap is the default implementation of the {@link org.apache.commons.collections.MultiMap MultiMap} interface.
A MultiMap is a Map with slightly different semantics. Putting a value into the map will add the value to a Collection at that key. Getting a value will return a Collection, holding all the values put to that key.
This implementation uses an ArrayList as the collection. The internal storage list is made available without cloning via the get(Object) and entrySet() methods. The implementation returns null when there are no values mapped to a key.
For example:
```
 MultiMap mhm = new MultiHashMap(); mhm.put(key, "A"); mhm.put(key, "B"); mhm.put(key, "C"); List list = (List) mhm.get(key);
```
list will be a list containing "A", "B", "C". @since Commons Collections 2.0 @version $Revision: 1.20 $ $Date: 2004/06/09 22:11:54 $ @author Christopher Berry @author James Strachan @author Steve Downey @author Stephen Colebourne @author Julien Buret @author Serhiy Yevtushenko

   * @return the process maps
   */
  public static Map[] getProcessMaps(int pid)
  {
    Map processMap = new HashMap();
    Map childrenMap = new MultiHashMap();
    Map[] result = new Map[]
    { processMap, childrenMap };


    Pointer processes = MyKernel32.INSTANCE.CreateToolhelp32Snapshot(MyKernel32.TH32CS_SNAPPROCESS, 0);
    if (processes == null)
    {
      System.out.println("note: task list is empty ");
      return result;
    }


    PROCESSENTRY32 me = new PROCESSENTRY32();
    me.szExeFile = new char[MyKernel32.MAX_PATH];
    int size = me.size();
    // System.out.println("size: " + size);
    me.dwSize = size;
    if (MyKernel32.INSTANCE.Process32First(processes, me))
    {
      System.out.println("ProcessList:");
      do
      {
        // System.out.println(/* new String(next.szExeFile) + */" " +
        // me.th32ModuleID + " " + me.th32DefaultHeapID + " " +
        // me.th32ProcessID
        // + " -> " + me.th32ParentProcessID);
        if (me.th32ProcessID > 0)
          processMap.put(new Integer(me.th32ProcessID), me);
        if (me.th32ParentProcessID > 0 && processMap.get(new Integer(me.th32ParentProcessID)) != null)
        {
          childrenMap.put(new Integer(me.th32ParentProcessID), new Integer(me.th32ProcessID));
        }
        System.out.println("\tProcessID=" + me.th32ProcessID + "\t\t -> ParentProcessID=" + me.th32ParentProcessID);


        // else
        // System.out.println("not added");

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    setState(state);
  }


  public void reset()
  {
    _listeners = Collections.synchronizedMap(new MultiHashMap());
    setState(STATE_IDLE);


  }

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    }
    
  }


  private static void bindMetaAttributes(Element element, Table table, OverrideRepository repository) {
    MultiMap map = MetaAttributeBinder.loadAndMergeMetaMap( element, new MultiHashMap());
    if(map!=null && !map.isEmpty()) {
      repository.addMetaAttributeInfo( table, map);
    } 
  }

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      TableIdentifier tableIdentifier = TableIdentifier.create(table);
      if(table.getColumn(column)!=null) {
        throw new MappingException("Column " + column.getName() + " already exists in table " + tableIdentifier );
      }
      
      MultiMap map = MetaAttributeBinder.loadAndMergeMetaMap( element, new MultiHashMap());
      if(map!=null && !map.isEmpty()) {
        repository.addMetaAttributeInfo( tableIdentifier, column.getName(), map);
      } 
      
      table.addColumn(column);

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      filter.setMatchSchema(element.attributeValue("match-schema") );
      filter.setMatchName(element.attributeValue("match-name") );
      filter.setExclude(Boolean.valueOf(element.attributeValue("exclude") ) );
      filter.setPackage(element.attributeValue("package") );
      
      MultiMap map = MetaAttributeBinder.loadAndMergeMetaMap( element, new MultiHashMap());
      if(map!=null && !map.isEmpty()) {
        filter.setMetaAttributes( map );
      } else {
        filter.setMetaAttributes( null );        
      }

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   * @param general
   * @return a MultiMap with all values from local and extra values
   * from inherited
   */
  public static MultiMap mergeMetaMaps(Map specific, Map general) {
    MultiHashMap result = new MultiHashMap();
    MetaAttributeHelper.copyMultiMap(result, specific);
    
    if (general != null) {
      for (Iterator iter = general.keySet().iterator();
        iter.hasNext();
        ) {
        String key = (String) iter.next();
  
        if (!specific.containsKey(key) ) {
          // inheriting a meta attribute only if it is inheritable
          Collection ml = (Collection) general.get(key);
          for (Iterator iterator = ml.iterator();
            iterator.hasNext();
            ) {
            MetaAttributeBinder.SimpleMetaAttribute element = (MetaAttributeBinder.SimpleMetaAttribute) iterator.next();
            if (element.inheritable) {
              result.put(key, element);
            }
          }
        }
      }
    }

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   * 
   * @param element
   * @return MultiMap
   */
   protected static MultiMap loadMetaMap(Element element) {
    MultiMap result = new MultiHashMap();
    List metaAttributeList = new ArrayList();
    metaAttributeList.addAll(element.elements("meta") );


    for (Iterator iter = metaAttributeList.iterator(); iter.hasNext();) {
      Element metaAttrib = (Element) iter.next();
      // does not use getTextNormalize() or getTextTrim() as that would remove the formatting in new lines in items like description for javadocs.
      String attribute = metaAttrib.attributeValue("attribute");
      String value = metaAttrib.getText();
      String inheritStr= metaAttrib.attributeValue("inherit");
      boolean inherit = true;
      if(inheritStr!=null) {
        inherit = Boolean.valueOf(inheritStr).booleanValue(); 
      }      
      
      MetaAttributeBinder.SimpleMetaAttribute ma = new MetaAttributeBinder.SimpleMetaAttribute(value, inherit);
      result.put(attribute, ma);
    }
    return result;


  }

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        return true;
    }


    // TODO: don't hardcode initial size
    private void createBlankCache() {
        this.m_eventMMap = new MultiHashMap(100); 
        this.m_keyMMap = new MultiHashMap(100); 
    }

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        BaseRequestType gft = (BaseRequestType)getFeature.getParameters()[0];
        
        List featureCollections = results.getFeature();


        //round up the info objects for each feature collection
        MultiHashMap ns2metas = new MultiHashMap();
        
        for (Iterator fc = featureCollections.iterator(); fc.hasNext();) {
            FeatureCollection<SimpleFeatureType, SimpleFeature> features = (FeatureCollection) fc.next();
            SimpleFeatureType featureType = features.getSchema();


            //load the metadata for the feature type
            String namespaceURI = featureType.getName().getNamespaceURI();
            FeatureTypeInfo meta = catalog.getFeatureTypeByName( namespaceURI, featureType.getTypeName() );
            if(meta == null)
                throw new WFSException("Could not find feature type " + namespaceURI + ":" + featureType.getTypeName() + " in the GeoServer catalog");


            NamespaceInfo ns = catalog.getNamespaceByURI( namespaceURI );
            ns2metas.put( ns, meta );
        }


        Collection<FeatureTypeInfo> featureTypes = ns2metas.values();
        
        //create the encoder
        ApplicationSchemaXSD xsd = new ApplicationSchemaXSD( null, catalog, gft.getBaseUrl(), 
            org.geotools.wfs.v1_0.WFS.getInstance(), featureTypes );
        Configuration configuration = new ApplicationSchemaConfiguration( xsd, new org.geotools.wfs.v1_0.WFSConfiguration() );
        
        Encoder encoder = new Encoder(configuration);
        //encoder.setEncoding(wfs.getCharSet());
        
       encoder.setSchemaLocation(org.geoserver.wfs.xml.v1_1_0.WFS.NAMESPACE,
               buildSchemaURL(gft.getBaseUrl(), "wfs/1.0.0/WFS-basic.xsd"));


        //declare application schema namespaces
        Map<String, String> params = params("service", "WFS", "version", "1.0.0", "request", "DescribeFeatureType");
        for (Iterator i = ns2metas.entrySet().iterator(); i.hasNext();) {
            Map.Entry entry = (Map.Entry) i.next();


            NamespaceInfo ns = (NamespaceInfo) entry.getKey();
            String namespaceURI = ns.getURI();

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            return MultiHashMap.class.equals(type);
        }


        public void marshal(Object source, HierarchicalStreamWriter writer,
                MarshallingContext context) {
            MultiHashMap map = (MultiHashMap) source;
            for (Object v : map.values()) {
                if (v instanceof DataStoreInfo) {
                    writer.startNode("dataStore");
                    context.convertAnother(v);
                    writer.endNode();
                }

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