package com.lf.server.helper;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.gdal.ogr.*;
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import java.lang.reflect.Field;
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import java.sql.Timestamp;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.LocalTime;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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/**
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* GDB帮助类
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* @author WWW
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*/
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public class GdbHelper {
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private final static Log log = LogFactory.getLog(GdbHelper.class);
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public static List<String> excludeFields = new ArrayList<String>();
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static {
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excludeFields.add("gid");
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excludeFields.add("shape_leng");
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}
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/**
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* 获取表名
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*/
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public static List<String> getTabNames(String filePath) {
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List<String> list = new ArrayList<>();
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try {
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org.gdal.ogr.Driver driver = ogr.GetDriverByName("OpenFileGDB");
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if (null == driver) {
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return list;
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}
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DataSource dataSource = driver.Open(filePath, 0);
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if (null == dataSource) {
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return list;
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}
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for (int i = 0, count = dataSource.GetLayerCount(); i < count; i++) {
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Layer layer = dataSource.GetLayer(i);
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list.add(layer.GetName());
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layer.delete();
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}
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dataSource.delete();
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driver.delete();
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} catch (Exception ex) {
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log.error(ex.getMessage(), ex);
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}
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return list;
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}
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/**
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* 读取数据
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*/
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public static <T> List<T> readData(Class clazz, String filePath, String layerName) {
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List<T> list = new ArrayList<>();
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try {
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org.gdal.ogr.Driver driver = ogr.GetDriverByName("OpenFileGDB");
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if (null == driver) {
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return list;
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}
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DataSource dataSource = driver.Open(filePath, 0);
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if (null == dataSource) {
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return list;
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}
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for (int i = 0, count = dataSource.GetLayerCount(); i < count; i++) {
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Layer layer = dataSource.GetLayer(i);
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if (layer.GetName().equals(layerName)) {
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GdbHelper.readLayer(clazz, layer, list);
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break;
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}
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layer.delete();
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}
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dataSource.delete();
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driver.delete();
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} catch (Exception ex) {
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log.error(ex.getMessage(), ex);
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}
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return list;
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}
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/**
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* 读取图层
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*/
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public static <T> void readLayer(Class clazz, Layer layer, List<T> list) {
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try {
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Field gField = getGeomField(clazz);
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Map<Integer, Field> map = getFieldMapper(clazz, layer);
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if (map.size() == 0) {
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return;
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}
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if (1 > layer.GetFeatureCount()) {
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return;
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}
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do {
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Feature f = layer.GetNextFeature();
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if (null == f) {
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break;
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}
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T t = (T) clazz.newInstance();
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if (readFeature(t, f, map, gField)) {
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list.add(t);
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}
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} while (true);
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} catch (Exception ex) {
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log.error(ex.getMessage(), ex);
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} finally {
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if (null != layer) {
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layer.delete();
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}
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}
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}
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/**
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* 获取 geom 字段
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*/
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private static Field getGeomField(Class clazz) {
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try {
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Field gField = clazz.getDeclaredField("geom");
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gField.setAccessible(true);
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return gField;
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} catch (Exception ex) {
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return null;
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}
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}
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/**
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* 获取字段映射
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*/
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private static <T> Map<Integer, Field> getFieldMapper(Class clazz, Layer layer) {
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Map<Integer, Field> map = new HashMap<>(3);
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try {
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FeatureDefn fd = layer.GetLayerDefn();
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for (int i = 0, count = fd.GetFieldCount(); i < count; i++) {
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FieldDefn fieldDefn = fd.GetFieldDefn(i);
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try {
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String name = fieldDefn.GetName().toLowerCase();
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if (excludeFields.contains(name)){
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continue;
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}
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Field field = clazz.getDeclaredField(name);
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field.setAccessible(true);
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map.put(i, field);
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} catch (Exception e) {
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//
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}
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}
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} catch (Exception ex) {
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//
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}
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return map;
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}
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/**
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* 读取Feature
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*/
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private static <T> boolean readFeature(T t, Feature f, Map<Integer, Field> map, Field gField) {
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try {
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for (Integer i : map.keySet()) {
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Field field = map.get(i);
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setValue(t, f, field, i);
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}
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if (null != gField) {
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setGeom(t, f, gField);
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}
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return true;
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} catch (Exception ex) {
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return false;
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}
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}
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/**
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* 设置值
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*/
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private static <T> void setValue(T t, Feature f, Field field, Integer i) throws Exception {
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switch (field.getType().toString()) {
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case "class java.math.BigDecimal":
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case "class java.lang.Double":
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case "double":
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field.set(t, f.GetFieldAsDouble(i));
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break;
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case "class java.lang.Long":
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case "long":
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field.set(t, f.GetFieldAsInteger64(i));
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break;
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case "class java.lang.Integer":
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case "int":
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field.set(t, f.GetFieldAsInteger(i));
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break;
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case "class java.sql.Timestamp":
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field.set(t, getTimestamp(f, i));
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break;
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default:
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field.set(t, f.GetFieldAsString(i));
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break;
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}
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}
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/**
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* 设置 geom 字段值
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* <p>
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* wkbUnknown = 0,
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* wkbPoint = 1,
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* wkbLineString = 2,
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* wkbPolygon = 3,
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* wkbMultiPoint = 4,
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* wkbMultiLineString = 5,
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* wkbMultiPolygon = 6,
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* wkbGeometryCollection = 7,
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* wkbNone = 100,
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* wkbLinearRing = 101
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*/
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private static <T> void setGeom(T t, Feature f, Field gField) throws Exception {
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Geometry geometry = f.GetGeometryRef();
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if (null != geometry) {
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String wkt = geometry.ExportToWkt();
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switch (geometry.GetGeometryType()) {
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case 2:
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wkt = wkt.replace("LINESTRING (", "MULTILINESTRING ((") + ")";
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break;
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case 3:
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wkt = wkt.replace("POLYGON (", "MULTIPOLYGON ((") + ")";
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break;
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default:
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break;
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}
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gField.set(t, String.format("ST_GeomFromText('%s')", wkt));
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}
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}
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/**
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* 获取 Timestamp
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*/
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private static Timestamp getTimestamp(Feature f, int index) {
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int[] pnYear = new int[1];
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int[] pnMonth = new int[1];
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int[] pnDay = new int[1];
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int[] pnHour = new int[1];
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int[] pnMinute = new int[1];
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float[] pfSecond = new float[1];
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int[] pnTzFlag = new int[1];
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f.GetFieldAsDateTime(index, pnYear, pnMonth, pnDay, pnHour, pnMinute, pfSecond, pnTzFlag);
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float fSecond = pfSecond[0];
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int s = (int) fSecond;
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int ns = (int) (1000000000 * fSecond - s);
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LocalDateTime localDateTime = LocalDateTime.of(
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LocalDate.of(pnYear[0], pnMonth[0], pnDay[0]),
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LocalTime.of(pnHour[0], pnMinute[0], s, ns)
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);
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Timestamp timestamp = Timestamp.valueOf(localDateTime);
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return timestamp;
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}
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}
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