query.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.datasources.ogc.wfs;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import com.esri.solutions.jitk.datasources.ogc.filters.IFilter;

public class Query implements IQuery {
	protected String _typeName = null;
	protected List<String> _propertyNames = null;
	protected IFilter _filter = null;
	protected CoordinateReferenceSystem _crs = null;
	
	public Query() {
		_propertyNames = new ArrayList<String>();
	}
	
	public String getTypeName() {
		return _typeName;
	}
	
	public void setCrs(CoordinateReferenceSystem crs) {
		_crs = crs;
	}
	
	public void setTypeName(String name) {
		_typeName = name;
	}
	
	public List<String> getPropertyNames() {
		return _propertyNames;
	}
	
	public void sePropertyNames(List<String> names) {
		_propertyNames = names;
	}
	
	public IFilter getFilter() {
		return _filter;
	}
	
	public void setFilter(IFilter _filter) {
		this._filter = _filter;
	}
	
	/**
	 * From WFS Spec, page 36:
	 * The optional srsName attribute of the <Query> element is used to 
	 * specify a specific WFS-supported SRS to be used for 
	 * returned feature geometries. Its value may be the <DefaultSRS> 
	 * or any of the <OtherSRS> values listed for the feature type in 
	 * WFS capabilities document. If no srsName value is supplied, then 
	 * the features shall be returned using the advertised <DefaultSRS> 
	 * value. This attribute has no meaning for feature types with no 
	 * spatial properties; if an srsName value is specified for a 
	 * feature with no spatial properties, a web feature service may 
	 * ignore the parameter and its value.
	 */
	
	public void toXML(OutputStream os) throws IOException {
		String s = "<wfs:Query typeName=\"" + _typeName + "\"";
		
		if (_crs != null) {
			s += " srsName=\"" + _crs.getURNFormat() + "\"";
		}
		
		s += ">";
		
		os.write(s.getBytes());
		
		if (_filter != null) {
			_filter.toXML(os);
		}
		
		os.write("</wfs:Query>".getBytes());	
	}

	public void addPropertyName(String propertyName) {
		_propertyNames.add(propertyName);
	}
}