layercatalog.java

动态添加图层的ARCGIS代码

package com.esri.arcgis.webcontrols.test;

import com.esri.arcgis.webcontrols.ags.data.*;
import java.util.*;
import java.io.*;
import javax.faces.model.SelectItem;
import com.esri.arcgis.carto.*;

public class LayerCatalog {

  //change the path to where you store the file.
  private static String CATALOG_FILE = "com/esri/arcgis/webcontrols/test/catalog.properties";

  AGSWebContext agsContext;

  //layerName - shape file
  LinkedHashMap availableLayers = new LinkedHashMap();

  {
    try {
      InputStream stream = this.getClass().getClassLoader().getResourceAsStream(CATALOG_FILE);
      Properties props = new Properties();
      props.load(stream);
      String name;
      for(Enumeration e = props.propertyNames(); e.hasMoreElements();) {
        name = (String)e.nextElement();
        availableLayers.put(name, new File(props.getProperty(name)));
      }
    }
    catch(Exception _) {
      throw new IllegalStateException("Cannot load layer catalog.\n\t" + _);
    }
  }

  ArrayList addLayerNames;
  ArrayList addLayerIndices;

  public LayerCatalog(AGSWebContext agsContext) {
    this.agsContext = agsContext;
  }

  public Collection getAddLayerNames() {
    if(addLayerNames != null)
      return addLayerNames;
    addLayerNames = new ArrayList();
    for (Iterator iter = availableLayers.keySet().iterator(); iter.hasNext(); )
      addLayerNames.add(new SelectItem(iter.next()));

    return addLayerNames;
  }

  public Collection getAddLayerIndices() {
    if(addLayerIndices != null)
      return addLayerIndices;
    fetchLayerIndices();
    return addLayerIndices;
  }

  private void fetchLayerIndices() {
    addLayerIndices = new ArrayList();
    int layerCount = 1;
    try {
      IMapServer server = agsContext.getServer();
      AGSWebMap agsMap = (AGSWebMap) agsContext.getWebMap();
      layerCount = server.getServerInfo(agsMap.getFocusMapName()).getMapLayerInfos().getCount();
    }
    catch(Exception _) { layerCount = 1; }
    for(int i = 0; i <= layerCount; ++i) {
      if(i == 0)
        addLayerIndices.add(new SelectItem(new Integer(i), "Top"));
      else if(i == layerCount)
        addLayerIndices.add(new SelectItem(new Integer(i), "Bottom"));
      else
        addLayerIndices.add(new SelectItem(new Integer(i), "Top + " + i));
    }
  }
}