GeoTools应用-Filter

org.geotools.filter

 This is most often used when making a Query to retrieve specific Feature s from a DataStore

package com.mapbar.geo.main;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.Set;

import javax.xml.parsers.ParserConfigurationException;

import org.geotools.data.FeatureSource;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.factory.CommonFactoryFinder;
import org.geotools.factory.GeoTools;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.filter.text.cql2.CQL;
import org.geotools.filter.text.cql2.CQLException;
import org.geotools.xml.Configuration;
import org.geotools.xml.Parser;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.Filter;
import org.opengis.filter.FilterFactory2;
import org.opengis.filter.identity.FeatureId;
import org.xml.sax.SAXException;

/**
 * 
 * Class FilterExam.java
 * 
 * Description GeoTools Filter 应用
 * GeoTools makes use of the GeoAPI project Filter interface in order to express constraints. 
 * This is most often used when making a Query to retrieve specific Features from a DataStore
 * notice：GeoTools FilterFactory is deprecated
 * 
 * Company mapbar
 * 
 * author Chenll E-mail: Chenll@mapbar.com
 * 
 * Version 1.0
 * 
 * Date 2012-2-15 下午02:27:44
 */
public class FilterExam {
	
	//使用openGIS FilterFactory2
	private static FilterFactory2  ff = CommonFactoryFinder.getFilterFactory2(GeoTools.getDefaultHints());
	/**
	 * 获取数据
	 * 
	 * @param shpPath
	 * @return
	 * @throws IOException
	 */
	public FeatureSource<SimpleFeatureType, SimpleFeature> getFeatureS(
			String shpPath) throws IOException {
		ShapefileDataStore store = new ShapefileDataStore(new File(shpPath)
				.toURI().toURL());
		store.setStringCharset(Charset.forName("GBK"));
		FeatureSource<SimpleFeatureType, SimpleFeature> features = store
				.getFeatureSource(store.getTypeNames()[0]);
		return features;
	}

	
	/**
	 * 获取feature id 集合
	 * @param fs
	 * @return
	 * @throws IOException
	 */
	public Set<FeatureId> getFeatureId(
			FeatureSource<SimpleFeatureType, SimpleFeature> fs) throws IOException {
		FeatureIterator<SimpleFeature> itertor = fs.getFeatures().features();
		Set<FeatureId> fids = new HashSet<FeatureId>();
		while (itertor.hasNext()) {
			SimpleFeature feature = itertor.next();
			fids.add(feature.getIdentifier());
		}
		itertor.close();
		return fids;
	}
	
	/**
	 * 使用feature id 作为过滤条件
	 * @param fs 
	 * @return
	 * @throws IOException
	 */
	public FeatureCollection filterFidEx(
			FeatureSource<SimpleFeatureType, SimpleFeature> fs)
			throws IOException {
		Set<FeatureId> fids = getFeatureId(fs);
		FilterFactory2 ff = CommonFactoryFinder.getFilterFactory2(GeoTools.getDefaultHints());
		Filter filt = (Filter) ff.id(fids);
		FeatureCollection col = fs.getFeatures(filt);
		return col;
	}
	
	/**
	 * 相等，不等，超过，不超过几种情况
	 * 
	 * @param fs
	 * @return
	 * @throws IOException
	 */
	public FeatureCollection compareFilterEx(
			FeatureSource<SimpleFeatureType, SimpleFeature> fs)
			throws IOException {
		Filter left = ff.equals(ff.property( "NAME" ), ff.literal( "4路(长兴-火车站)" ));
		FeatureCollection col = fs.getFeatures(left);
		return col;
	}
	
	
	/**
	 * 过滤器对xml的支持，即把条件写在xml文件里面，这样做到可以配置
	 * @param fs
	 * @return
	 * @throws IOException
	 * @throws SAXException
	 * @throws ParserConfigurationException
	 */
	public FeatureCollection filterXML(FeatureSource<SimpleFeatureType, SimpleFeature> fs,String fileName) throws IOException, SAXException, ParserConfigurationException{
		Configuration configuration = new org.geotools.filter.v1_0.OGCConfiguration();
		Parser parser = new Parser( configuration );
		InputStream xml = ClassLoader.getSystemResourceAsStream(fileName);
		//parse
		Filter filter = (Filter) parser.parse( xml );
		FeatureCollection col = fs.getFeatures(filter);
		return col;
	}
	
	
	
	/**
	 * CQL (common query language)
	 * @param fs
	 * @param name
	 * @return
	 * @throws CQLException
	 * @throws IOException
	 * Filter f = CQL.toFilter("ATTR1 < 10 AND ATTR2 < 2 OR ATTR3 > 10");
	 Filter f = CQL.toFilter("NAME = 'New York' ");
	 Filter f = CQL.toFilter("NAME LIKE 'New%' ");
	 Filter f = CQL.toFilter("NAME IS NULL");
	 Filter f = CQL.toFilter("DATE BEFORE 2006-11-30T01:30:00Z");
	 Filter f = CQL.toFilter("NAME DOES-NOT-EXIST");
	 Filter f = CQL.toFilter("QUANTITY BETWEEN 10 AND 20");
	 Filter f = CQL.toFilter("CROSSES(SHAPE, LINESTRING(1 2, 10 15))");
	 Filter f = CQL.toFilter("BBOX(SHAPE, 10,20,30,40)");
	 Expression e = CQL.toExpression("NAME");
	 Expression e = CQL.toExpression("QUANTITY * 2");
	 Expression e = CQL.toExpression("strConcat(NAME, 'suffix')");
	 List filters = CQL.toFilterList("NAME IS NULL;BBOX(SHAPE, 10,20,30,40);INCLUDE");
	 */
	public FeatureCollection filterCQL(FeatureSource<SimpleFeatureType, SimpleFeature> fs,String name) throws CQLException, IOException{
		return fs.getFeatures(CQL.toFilter("NAME like '%" + name + "%'"));
	}
	

	public static void main(String[] args) throws IOException, CQLException, SAXException, ParserConfigurationException {
		FilterExam fe = new FilterExam();
		FeatureSource<SimpleFeatureType, SimpleFeature> fs = fe.getFeatureS("D:\\安康公交线_polyline.shp");
		FeatureCollection col1 = fe.compareFilterEx(fs);
		System.out.println(col1.size());
		FeatureCollection col2 = fe.filterFidEx(fs);
		System.out.println(col2.size());
		FeatureCollection col3 = fe.filterCQL(fs, "13路");
		System.out.println(col3.size());
		FeatureCollection col4 = fe.filterXML(fs, "filter.xml");
		System.out.println(col4.size());
	}
}

filter.xml 文件格式定义如下：

<Filter xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:ogc="http://www.opengis.net/ogc"
    xmlns="http://www.opengis.net/ogc"
    xsi:schemaLocation="http://www.opengis.net/ogc filter.xsd">
  <PropertyIsEqualTo>
    <PropertyName>NAME</PropertyName>
    <Literal>13路上行(火车站-市工商局)</Literal>
  </PropertyIsEqualTo>
</Filter>

转载自：https://blog.csdn.net/cdl2008sky/article/details/7266873