teichmann@5835: package org.dive4elements.river.client.server.meta;
sascha@286: 
sascha@286: import org.w3c.dom.Document;
sascha@286: import org.w3c.dom.Element;
sascha@286: import org.w3c.dom.Node;
sascha@286: import org.w3c.dom.NodeList;
sascha@813: import org.w3c.dom.Attr;
sascha@813: import org.w3c.dom.NamedNodeMap;
sascha@813: 
ingo@1367: import org.apache.log4j.Logger;
sascha@286: 
teichmann@5835: import org.dive4elements.river.client.shared.model.DataCageTree;
teichmann@5835: import org.dive4elements.river.client.shared.model.DataCageNode;
teichmann@5835: import org.dive4elements.river.client.shared.model.AttrList;
sascha@286: 
sascha@286: import java.util.ArrayList;
sascha@286: import java.util.Map;
sascha@286: import java.util.HashMap;
sascha@286: 
teichmann@5835: import org.dive4elements.artifacts.common.utils.XMLUtils;
sascha@812: 
felix@3474: /**
felix@3474:  * Converts document parts (meta-data xml) to datacagenodes/trees,
felix@3474:  * which are shown in datacage widgets.
felix@3474:  */
sascha@286: public class Converter
sascha@286: {
ingo@1367:     private static final Logger logger = Logger.getLogger(Converter.class);
ingo@1367: 
ingo@1367: 
sascha@286:     public interface NodeConverter
sascha@286:     {
sascha@286:         DataCageNode convert(Element node, Converter converter);
sascha@286: 
sascha@286:     } // interface NodeConverter
sascha@286: 
sascha@286:     public static class NameConverter implements NodeConverter {
sascha@286:         public DataCageNode convert(Element node, Converter converter) {
sascha@822:             //System.err.println("NameConverter called");
sascha@813:             DataCageNode out = new DataCageNode(
sascha@813:                 node.getAttribute("name"),
sascha@813:                 toAttrList(node.getAttributes()));
sascha@286:             converter.convertChildren(out, node);
sascha@286:             return out;
sascha@286:         }
sascha@286:     } // class NameConverter
sascha@286: 
sascha@286:     public static class I18NConverter implements NodeConverter {
sascha@286:         public DataCageNode convert(Element node, Converter converter) {
sascha@822:             //System.err.println("I18NConverter called");
ingo@892: 
ingo@892:             String name = node.getLocalName();
ingo@892:             String desc = node.hasAttribute("description")
sascha@822:                 ? node.getAttribute("description")
ingo@892:                 : "${" + name + "}";
ingo@892: 
sascha@286:             DataCageNode out =
ingo@892:                 new DataCageNode(name, desc, toAttrList(node.getAttributes()));
ingo@892: 
sascha@286:             converter.convertChildren(out, node);
sascha@286:             return out;
sascha@286:         }
sascha@286:     } // I18NConverter
sascha@286: 
felix@3475:     private static Map<String, NodeConverter> converters = new HashMap<String, NodeConverter>();
sascha@286: 
sascha@2905:     public static final NodeConverter NAME_CONVERTER = new NameConverter();
sascha@2905:     public static final NodeConverter I18N_CONVERTER = new I18NConverter();
sascha@812: 
felix@3474:     static {
sascha@812:         converters.put("river",      NAME_CONVERTER);
sascha@812:         converters.put("gauge",      NAME_CONVERTER);
sascha@812:         converters.put("historical", NAME_CONVERTER);
sascha@812:         converters.put("column",     NAME_CONVERTER);
sascha@286:     }
sascha@286: 
felix@3475: 
felix@3475:     /** Trivial constructor. */
felix@3474:     public Converter() {
felix@3474:     }
felix@3474: 
felix@3475: 
sascha@286:     public DataCageTree convert(Document document) {
ingo@1367:         logger.debug("convert called");
bjoern@4352: 
bjoern@4352:         if (logger.isDebugEnabled()) {
bjoern@4352:             logger.debug(XMLUtils.toString(document));
bjoern@4352:         }
sascha@286: 
sascha@286:         ArrayList<DataCageNode> roots = new ArrayList<DataCageNode>();
sascha@286:         NodeList nodes = document.getChildNodes();
sascha@286:         for (int i = 0, N = nodes.getLength(); i < N; ++i) {
sascha@286:             Node node = nodes.item(i);
sascha@286:             if (node.getNodeType() == Node.ELEMENT_NODE) {
bjoern@4352:                 Element ele = (Element)node;
bjoern@4352:                 roots.add(convertElement(ele));
sascha@286:             }
sascha@286:         }
sascha@286:         return roots.isEmpty()
sascha@286:             ? new DataCageTree()
sascha@286:             : new DataCageTree(roots.get(0));
sascha@286:     }
sascha@813: 
felix@3475:     protected void convertChildren(DataCageNode parent, Element sub) {
felix@3475:         //System.err.println("convertChildren called");
felix@3475:         NodeList children = sub.getChildNodes();
felix@3475:         for (int i = 0, N = children.getLength(); i < N; ++i) {
felix@3475:             Node child = children.item(i);
felix@3475:             if (child.getNodeType() == Node.ELEMENT_NODE) {
bjoern@4352:                 Element childele = (Element)child;
bjoern@4352:                 parent.addChild(convertElement(childele));
felix@3475: 
bjoern@4352:             if (childele.hasAttribute("description"))
bjoern@4352:                 logger.debug("nwd: " + childele.getAttribute("description"));
felix@3475:             }
felix@3475:         } // for all children
felix@3475:     }
felix@3475: 
bjoern@4352:     private DataCageNode convertElement(Element element) {
bjoern@4352:         String name = element.getLocalName();
bjoern@4352: 
bjoern@4352:         logger.debug("search for name: " + name);
bjoern@4352: 
bjoern@4352:         NodeConverter converter = converters.get(name);
bjoern@4352:         if (converter == null) {
bjoern@4352:             converter = I18N_CONVERTER;
bjoern@4352:         }
bjoern@4352:         return converter.convert(element, this);
bjoern@4352: 
bjoern@4352:     }
bjoern@4352: 
sascha@3483: 
felix@3474:     /**
felix@3474:      * Creates key/value pairs from Nodes Attributes.
felix@3474:      */
sascha@813:     public static AttrList toAttrList(NamedNodeMap nodeMap) {
sascha@813:         if (nodeMap == null) {
sascha@813:             return null;
sascha@813:         }
sascha@813:         int N = nodeMap.getLength();
sascha@813: 
sascha@813:         if (N == 0) {
sascha@813:             return null;
sascha@813:         }
sascha@813: 
sascha@813:         AttrList result = new AttrList(N);
sascha@813: 
sascha@813:         for (int i = 0; i < N; ++i) {
sascha@813:             Node node = nodeMap.item(i);
sascha@813:             if (node.getNodeType() == Node.ATTRIBUTE_NODE) {
sascha@822:                 Attr   attr  = (Attr)node;
sascha@813:                 String key   = attr.getName();
sascha@813:                 String value = attr.getValue();
sascha@813:                 result.add(key, value);
sascha@813:             }
sascha@813:         }
sascha@813: 
sascha@813:         return result;
sascha@813:     }
sascha@286: }
sascha@286: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :