/
FeatureHandler.java
256 lines (220 loc) · 7.7 KB
/
FeatureHandler.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2010, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.geojson.feature;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.geotools.geojson.DelegatingHandler;
import org.geotools.geojson.IContentHandler;
import org.geotools.geojson.geom.GeometryHandler;
import org.json.simple.parser.ParseException;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
/**
*
*
* @source $URL$
*/
public class FeatureHandler extends DelegatingHandler<SimpleFeature> {
String id;
Geometry geometry;
List<Object> values;
List<String> properties;
CoordinateReferenceSystem crs;
SimpleFeatureBuilder builder;
AttributeIO attio;
SimpleFeature feature;
public FeatureHandler() {
this(null, new DefaultAttributeIO());
}
public FeatureHandler(SimpleFeatureBuilder builder, AttributeIO attio) {
this.builder = builder;
this.attio = attio;
}
@Override
public boolean startObject() throws ParseException, IOException {
if (properties == NULL_LIST) {
properties = new ArrayList();
}
else if (properties != null) {
//start of a new object in properties means a geometry
delegate = new GeometryHandler(new GeometryFactory());
}
return super.startObject();
}
public boolean startObjectEntry(String key) throws ParseException, IOException {
if ("id".equals(key)) {
id = "";
return true;
}
else if ("crs".equals(key)) {
delegate = new CRSHandler();
return true;
}
else if ("geometry".equals(key)) {
delegate = new GeometryHandler(new GeometryFactory());
return true;
}
else if ("properties".equals(key) && delegate == NULL) {
properties = NULL_LIST;
values = new ArrayList();
}
else if (properties != null && delegate == NULL) {
properties.add(key);
return true;
}
return super.startObjectEntry(key);
}
@Override
public boolean startArray() throws ParseException, IOException {
if (properties != null && delegate == NULL) {
//array inside of properties
delegate = new ArrayHandler();
}
return super.startArray();
}
@Override
public boolean endArray() throws ParseException, IOException {
if (delegate instanceof ArrayHandler) {
super.endArray();
values.add(((ArrayHandler) delegate).getValue());
delegate = NULL;
}
return super.endArray();
}
@Override
public boolean endObject() throws ParseException, IOException {
if (delegate instanceof IContentHandler) {
((IContentHandler) delegate).endObject();
if (delegate instanceof GeometryHandler) {
if (properties != null) {
//this is a regular property
values.add(((IContentHandler<Geometry>)delegate).getValue());
}
else {
//its the default geometry
geometry = ((IContentHandler<Geometry>)delegate).getValue();
}
delegate = NULL;
}
else if (delegate instanceof CRSHandler) {
crs = ((CRSHandler)delegate).getValue();
delegate = UNINITIALIZED;
}
return true;
}
else if (delegate == UNINITIALIZED) {
delegate = NULL;
return true;
}
else if (properties != null) {
if (builder == null) {
//no builder specified, build on the fly
builder = createBuilder();
}
for (int i = 0; i < properties.size(); i++) {
String att = properties.get(i);
Object val = values.get(i);
if (val instanceof String) {
val = attio.parse(att, (String)val);
}
builder.set(att, val );
}
properties = null;
values = null;
return true;
}
else {
feature = buildFeature();
id = null;
geometry = null;
properties = null;
values = null;
return true;
}
}
@Override
public boolean primitive(Object value) throws ParseException, IOException {
if ("".equals(id)) {
id = value.toString();
return true;
}
else if (values != null && delegate == NULL) {
//use the attribute parser
values.add(value);
return true;
}
return super.primitive(value);
}
@Override
public SimpleFeature getValue() {
return feature;
}
public CoordinateReferenceSystem getCRS() {
return crs;
}
public void setCRS(CoordinateReferenceSystem crs) {
this.crs = crs;
}
public void init() {
feature = null;
}
SimpleFeatureBuilder createBuilder() {
SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder();
typeBuilder.setName("feature");
typeBuilder.setNamespaceURI("http://geotools.org");
typeBuilder.setCRS(crs);
if (properties != null) {
for (int i = 0; i < properties.size(); i++) {
String prop = properties.get(i);
Object valu = values.get(i);
typeBuilder.add(prop, valu != null ? valu.getClass() : Object.class);
}
}
if (geometry != null) {
typeBuilder.add("geometry", geometry != null ? geometry.getClass() : Geometry.class);
typeBuilder.setDefaultGeometry("geometry");
}
return new SimpleFeatureBuilder(typeBuilder.buildFeatureType());
}
SimpleFeature buildFeature() {
SimpleFeatureBuilder builder = this.builder != null ? this.builder : createBuilder();
SimpleFeatureType featureType = builder.getFeatureType();
if (geometry != null) {
builder.set(featureType.getGeometryDescriptor().getLocalName(), geometry);
}
return builder.buildFeature(id);
}
// "{" +
// " 'type': 'Feature'," +
// " 'geometry': {" +
// " 'type': 'Point'," +
// " 'coordinates': [" + val + "," + val + "]" +
// " }, " +
// "' properties': {" +
// " 'int': 1," +
// " 'double': " + (double)val + "," +
// " 'string': '" + toString(val) + "'" +
// " }," +
// " 'id':'widgets." + val + "'" +
// "}";
}