/webportal/src/main/java/org/ala/spatial/gazetteer/AutoComplete.java

  1package org.ala.spatial.gazetteer;
  2
  3import org.apache.commons.httpclient.HttpClient;
  4import au.org.emii.portal.composer.MapComposer;
  5import au.org.emii.portal.util.GeoJSONUtilities;
  6import org.zkoss.zul.Combobox;
  7import org.zkoss.zk.ui.event.InputEvent;
  8import java.util.Iterator;
  9import net.sf.json.JSONArray;
 10import net.sf.json.JSONObject;
 11import org.ala.spatial.util.CommonData;
 12import org.apache.commons.httpclient.methods.GetMethod;
 13import org.zkoss.zul.Comboitem;
 14import org.zkoss.zk.ui.Page;
 15
 16public class AutoComplete extends Combobox {
 17    private String gazServer = null;
 18
 19    private GeoJSONUtilities geoJSONUtilities = null;
 20
 21    public AutoComplete() {
 22        refresh(""); //init the child comboitems
 23    }
 24
 25    public AutoComplete(String value) {
 26        super(value); //it invokes setValue(), which inits the child comboitems
 27    }
 28
 29
 30
 31    @Override
 32    public void setValue(String value) {
 33        super.setValue(value);
 34    }
 35    
 36     /**
 37     * Gets the main pages controller so we can add a
 38     * layer to the map
 39     * @return MapComposer = map controller class
 40     */
 41    private MapComposer getThisMapComposer() {
 42
 43        MapComposer mapComposer = null;
 44        Page page = this.getPage();
 45        mapComposer = (MapComposer) page.getFellow("mapPortalPage");
 46
 47        return mapComposer;
 48    }
 49
 50    /** Listens for what a user is entering.
 51     * @param evt
 52     */
 53    public void onChanging(InputEvent evt) {
 54        if (!evt.isChangingBySelectBack()) {
 55            refresh(evt.getValue());
 56        }
 57    }
 58
 59    /** Refresh comboitem based on the specified value.
 60     */
 61    private void refresh(String val) {
 62        String searchString = val.trim().replaceAll("\\s+", "+");
 63
 64        searchString = (searchString.equals(""))?"a":searchString;
 65
 66        try {            
 67            HttpClient client = new HttpClient();
 68            GetMethod get = new GetMethod(CommonData.layersServer + "/search?limit=40&q=" + searchString);
 69            get.addRequestHeader("Accept", "application/json, text/javascript, */*");
 70            int result = client.executeMethod(get);
 71            String slist = get.getResponseBodyAsString();
 72
 73            JSONArray ja = JSONArray.fromObject(slist);
 74
 75            if(ja == null) {
 76                return;
 77            }
 78            
 79            Iterator it = getItems().iterator();
 80
 81            for(int i=0;i<ja.size();i++) {
 82                JSONObject jo = ja.getJSONObject(i);
 83                String itemString = jo.getString("name");
 84                String description = (jo.containsKey("description") ? jo.getString("description"): "")
 85                         + " (" + jo.getString("fieldname") + ")" ;
 86
 87                if (it != null && it.hasNext()) {
 88                    Comboitem ci = (Comboitem) it.next();
 89                    ci.setLabel(itemString);
 90                    ci.setValue(jo);
 91                    ci.setDescription(description);
 92                } else {
 93                    it = null;
 94                    Comboitem ci = new Comboitem();
 95                    ci.setLabel(itemString);
 96                    ci.setValue(jo);
 97                    ci.setDescription(description);
 98                    ci.setParent(this);
 99                }
100            }
101
102            while (it != null && it.hasNext()) {
103                it.next();
104                it.remove();
105            }
106
107        } catch (Exception e) {
108            e.printStackTrace();
109        }
110    }
111
112}