skrueger/geotools/StyledFeatureCollection.java

/*******************************************************************************
 * Copyright (c) 2009 Martin O. J. Schmitz.
 * 
 * This file is part of the SCHMITZM library - a collection of utility 
 * classes based on Java 1.6, focusing (not only) on Java Swing 
 * and the Geotools library.
 * 
 * The SCHMITZM project is hosted at:
 * http://wald.intevation.org/projects/schmitzm/
 * 
 * This program 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; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License (license.txt)
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * or try this link: http://www.gnu.org/licenses/lgpl.html
 * 
 * Contributors:
 *     Martin O. J. Schmitz - initial API and implementation
 *     Stefan A. Krüger - additional utility classes
 ******************************************************************************/
package skrueger.geotools;

import java.io.IOException;
import java.net.URL;

import javax.swing.ImageIcon;

import org.geotools.data.FeatureSource;
import org.geotools.data.collection.CollectionDataStore;
import org.geotools.feature.FeatureCollection;
import org.geotools.styling.Style;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;

import schmitzm.geotools.feature.FeatureUtil;
import skrueger.AttributeMetaData;
import skrueger.i8n.Translation;

/**
 * This class provides a simple implementation of {@link StyledLayerInterface} for
 * {@link FeatureCollection}. The uncache functionality is not supported,
 * because this class bases on an existing {@link FeatureCollection} object in
 * memory.
 * 
 * @author <a href="mailto:[email protected]">Martin Schmitz</a>
 *         (University of Bonn/Germany)
 * @version 1.0
 */
public class StyledFeatureCollection extends
                AbstractStyledLayer<FeatureCollection<SimpleFeatureType, SimpleFeature> > implements
                StyledFeatureCollectionInterface {

        /** Holds the meta data for displaying a legend. */
        protected AttributeMetadataMap attrMetaData = null;

        /**
         * We be filled with a "virtual" {@link FeatureSource} on demand.
         */
        private FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = null;

        /**
         * Creates a styled {@link FeatureCollection} with language-specific
         * informations.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a (language-specific) short description
         * @param desc
         *            a (language-specific) long description
         * @param keywords
         *            (language-specific) keywords for the geo objects
         * @param style
         *            a display style (if {@code null}, a default style is created)
         * @param attrMetaData
         *            meta data for displaying a legend
         * @param icon
         *            an icon for the object (can be {@code null})
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        Translation title, Translation desc, Translation keywords,
                        Style style, AttributeMetadataMap attrMetaData,
                        ImageIcon icon) {
                super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
                                .getCoordinateReferenceSystem(), id, title, desc, keywords, style, icon);
                setAttributeMetaData(attrMetaData);
        }

        /**
         * Creates a styled {@link FeatureCollection} with language-specific
         * informations.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a (language-specific) short description
         * @param desc
         *            a (language-specific) long description
         * @param keywords
         *            (language-specific) keywords for the geo objects
         * @param style
         *            a display style with attribute meta data information
         * @param icon
         *            an icon for the object (can be {@code null})
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        Translation title, Translation desc, Translation keywords,
                        StyledLayerStyle<AttributeMetadataMap> style,
                        ImageIcon icon) {
                super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
                                .getCoordinateReferenceSystem(), id, title, desc, keywords,
                                style != null ? style.getGeoObjectStyle() : null, icon);
                setAttributeMetaData(style != null ? style.getMetaData() : null);
        }

        /**
         * Creates a styled {@link FeatureCollection} with a language-specific
         * title, no long description, no keywords, default attribute meta data and
         * no icon.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a short description
         * @param style
         *            a display style (if {@code null}, a default style is created)
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         * @see #createDefaultAttributeMetaDataMap(FeatureCollection)
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        Translation title, Style style) {
                this(fc, id, title, null, null, style, null, null);
        }

        /**
         * Creates a styled {@link FeatureCollection} with non-translated
         * informations.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a short description
         * @param desc
         *            a long description
         * @param keywords
         *            keywords for the geo objects
         * @param style
         *            a display style (if {@code null}, a default style is created)
         * @param attrMetaData
         *            meta data for displaying a legend
         * @param icon
         *            an icon for the object (can be {@code null})
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        String title, String desc, String keywords, Style style,
                        AttributeMetadataMap attrMetaData, ImageIcon icon) {
                this(fc, id, (Translation) null, null, null, style, attrMetaData, icon);
                setTitle(title);
                setDesc(desc);
                setKeywords(keywords);
        }

        /**
         * Creates a styled {@link FeatureCollection} with non-translated
         * informations.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a short description
         * @param desc
         *            a long description
         * @param keywords
         *            keywords for the geo objects
         * @param style
         *            a display style with attribute meta data information
         * @param icon
         *            an icon for the object (can be {@code null})
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        String title, String desc, String keywords,
                        StyledLayerStyle<AttributeMetadataMap> style,
                        ImageIcon icon) {
                this(fc, id, title, desc, keywords, style != null ? style
                                .getGeoObjectStyle() : null, style != null ? style
                                .getMetaData() : null, icon);
        }

        /**
         * Creates a styled {@link FeatureCollection} with a non-translated title,
         * no long description, no keywords, default attribute meta data and no
         * icon.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a short description
         * @param style
         *            a display style (if {@code null}, a default style is created)
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         * @see #createDefaultAttributeMetaDataMap(FeatureCollection)
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        String title, Style style) {
                this(fc, id, title, null, null, style, null, null);
        }

        /**
         * Creates a styled {@link FeatureCollection} with a non-translated title,
         * no long description, no keywords, default attribute meta data and no
         * icon.
         * 
         * @param fc
         *            the {@link FeatureCollection}
         * @param id
         *            a unique ID for the object
         * @param title
         *            a short description
         * @param style
         *            a display style (if {@code null}, a default style is created)
         * @exception IllegalArgumentException
         *                if {@code null} is given as ID or geo object
         * @see #createDefaultAttributeMetaDataMap(FeatureCollection)
         */
        public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
                        String title, StyledLayerStyle<AttributeMetadataMap> style) {
                this(fc, id, title, null, null, style != null ? style
                                .getGeoObjectStyle() : null, style != null ? style
                                .getMetaData() : null, null);
        }

        /**
         * Creates a default style for the {@link FeatureCollection}.
         * 
         * @see FeatureUtil#createDefaultStyle(FeatureCollection)
         */
        protected Style createDefaultStyle() {
                return FeatureUtil.createDefaultStyle(geoObject);
        }

        /**
         * Returns the meta data needed for displaying a legend.
         */
        public AttributeMetadataMap getAttributeMetaDataMap() {
                return attrMetaData;
        }

        /**
         * Sets the meta data needed for displaying a legend. If {@code legendData}
         * is {@code null} an empty map is set, so
         * {@link #getAttributeMetaDataMap()} never returns {@code null}.
         * 
         * @param attrMetaData
         *            map of attribute meta data
         */
        public void setAttributeMetaData(
                        AttributeMetadataMap attrMetaData) {
                this.attrMetaData = (attrMetaData != null) ? attrMetaData
                                : createDefaultAttributeMetaDataMap(geoObject);
        }

        /**
         * Creates non-translated default meta data for a {@link FeatureCollection}
         * with all attributes visible and no unit set.
         * 
         * @param fc
         *            a {@link FeatureCollection}
         */
        public static AttributeMetadataMap createDefaultAttributeMetaDataMap(
                        FeatureCollection<SimpleFeatureType,SimpleFeature> fc) {
                AttributeMetadataMap metaDataMap = new AttributeMetadataMap();
                SimpleFeatureType ftype = fc.getSchema();
                for (int i = 0; i < ftype.getAttributeCount(); i++) {
                        AttributeDescriptor aType = ftype.getAttributeDescriptors().get(i);
                        if (aType != ftype.getGeometryDescriptor())
                                metaDataMap.put(i, new AttributeMetaData(i, // Column no.
                                                true, // visible
                                                new Translation(aType.getLocalName()), // Column name
                                                new Translation(), // description
                                                "" // Unit
                                ));
                }
                return metaDataMap;
        }

        /**
         * Simply sets the {@link #geoObject}, {@link #crs}, {@link #envelope} and
         * {@link #attrMetaData} to {@code null}.
         */
        public void dispose() {
                this.geoObject = null;
                this.envelope = null;
                this.crs = null;
                this.attrMetaData = null;
        }

        /**
         * Tests whether the geo object is disposed.
         */
        public boolean isDisposed() {
                return geoObject == null;
        }

        /**
         * Does nothing, because the {@link AbstractStyledLayer} bases on existing
         * objects (in memory) which can not be uncached and reloaded.
         */
        public void uncache() {

                /** It will be recreated on the next getFetureSource() **/
                featureSource = null;

                LOGGER
                                .warn("Uncache onyl uncached any virtual FeatureSource. Object remains in memory.");
        }

        /*
         * (non-Javadoc)
         * 
         * @see skrueger.geotools.StyledLayerInterface#getInfoURL()
         */
        public URL getInfoURL() {
                return null;
        }

        /**
         * Same as {@link #getGeoObject()} method, but complies to the {@link StyledFeaturesInterface} 
         * @see {@link StyledFeaturesInterface}
         */
        @Override
        public FeatureCollection<SimpleFeatureType,SimpleFeature> getFeatureCollection() {
                return getGeoObject();
        }

        /**
         * Returns a virtual {@link FeatureSource} to access the
         * {@link FeatureCollection}. Once created, it will be reused until
         * {@link #uncache()} is called.<br/>
         * @see {@link StyledFeaturesInterface}
         */
        @Override
        public FeatureSource<SimpleFeatureType,SimpleFeature> getFeatureSource() {
                if (featureSource == null) {
                        CollectionDataStore store = new CollectionDataStore(getGeoObject());
                        try {
                                featureSource = store.getFeatureSource(store.getTypeNames()[0]);
                        } catch (IOException e) {
                                throw new RuntimeException(
                                                "Could not create a FeatureSource from the CollectionDataStore:",
                                                e);
                        }
                }
                return featureSource;
        }

}
1	/*******************************************************************************
2	* Copyright (c) 2009 Martin O. J. Schmitz.
3	*
4	* This file is part of the SCHMITZM library - a collection of utility
5	* classes based on Java 1.6, focusing (not only) on Java Swing
6	* and the Geotools library.
7	*
8	* The SCHMITZM project is hosted at:
9	* http://wald.intevation.org/projects/schmitzm/
10	*
11	* This program is free software; you can redistribute it and/or
12	* modify it under the terms of the GNU Lesser General Public License
13	* as published by the Free Software Foundation; either version 3
14	* of the License, or (at your option) any later version.
15	*
16	* This program is distributed in the hope that it will be useful,
17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19	* GNU General Public License for more details.
20	*
21	* You should have received a copy of the GNU Lesser General Public License (license.txt)
22	* along with this program; if not, write to the Free Software
23	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
24	* or try this link: http://www.gnu.org/licenses/lgpl.html
25	*
26	* Contributors:
27	* Martin O. J. Schmitz - initial API and implementation
28	* Stefan A. Krüger - additional utility classes
29	******************************************************************************/
30	package skrueger.geotools;
31
32	import java.io.IOException;
33	import java.net.URL;
34
35	import javax.swing.ImageIcon;
36
37	import org.geotools.data.FeatureSource;
38	import org.geotools.data.collection.CollectionDataStore;
39	import org.geotools.feature.FeatureCollection;
40	import org.geotools.styling.Style;
41	import org.opengis.feature.simple.SimpleFeature;
42	import org.opengis.feature.simple.SimpleFeatureType;
43	import org.opengis.feature.type.AttributeDescriptor;
44
45	import schmitzm.geotools.feature.FeatureUtil;
46	import skrueger.AttributeMetaData;
47	import skrueger.i8n.Translation;
48
49	/**
50	* This class provides a simple implementation of {@link StyledLayerInterface} for
51	* {@link FeatureCollection}. The uncache functionality is not supported,
52	* because this class bases on an existing {@link FeatureCollection} object in
53	* memory.
54	*
55	* @author <a href="mailto:[email protected]">Martin Schmitz</a>
56	* (University of Bonn/Germany)
57	* @version 1.0
58	*/
59	public class StyledFeatureCollection extends
60	AbstractStyledLayer<FeatureCollection<SimpleFeatureType, SimpleFeature> > implements
61	StyledFeatureCollectionInterface {
62
63	/** Holds the meta data for displaying a legend. */
64	protected AttributeMetadataMap attrMetaData = null;
65
66	/**
67	* We be filled with a "virtual" {@link FeatureSource} on demand.
68	*/
69	private FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = null;
70
71	/**
72	* Creates a styled {@link FeatureCollection} with language-specific
73	* informations.
74	*
75	* @param fc
76	* the {@link FeatureCollection}
77	* @param id
78	* a unique ID for the object
79	* @param title
80	* a (language-specific) short description
81	* @param desc
82	* a (language-specific) long description
83	* @param keywords
84	* (language-specific) keywords for the geo objects
85	* @param style
86	* a display style (if {@code null}, a default style is created)
87	* @param attrMetaData
88	* meta data for displaying a legend
89	* @param icon
90	* an icon for the object (can be {@code null})
91	* @exception IllegalArgumentException
92	* if {@code null} is given as ID or geo object
93	*/
94	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
95	Translation title, Translation desc, Translation keywords,
96	Style style, AttributeMetadataMap attrMetaData,
97	ImageIcon icon) {
98	super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
99	.getCoordinateReferenceSystem(), id, title, desc, keywords, style, icon);
100	setAttributeMetaData(attrMetaData);
101	}
102
103	/**
104	* Creates a styled {@link FeatureCollection} with language-specific
105	* informations.
106	*
107	* @param fc
108	* the {@link FeatureCollection}
109	* @param id
110	* a unique ID for the object
111	* @param title
112	* a (language-specific) short description
113	* @param desc
114	* a (language-specific) long description
115	* @param keywords
116	* (language-specific) keywords for the geo objects
117	* @param style
118	* a display style with attribute meta data information
119	* @param icon
120	* an icon for the object (can be {@code null})
121	* @exception IllegalArgumentException
122	* if {@code null} is given as ID or geo object
123	*/
124	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
125	Translation title, Translation desc, Translation keywords,
126	StyledLayerStyle<AttributeMetadataMap> style,
127	ImageIcon icon) {
128	super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
129	.getCoordinateReferenceSystem(), id, title, desc, keywords,
130	style != null ? style.getGeoObjectStyle() : null, icon);
131	setAttributeMetaData(style != null ? style.getMetaData() : null);
132	}
133
134	/**
135	* Creates a styled {@link FeatureCollection} with a language-specific
136	* title, no long description, no keywords, default attribute meta data and
137	* no icon.
138	*
139	* @param fc
140	* the {@link FeatureCollection}
141	* @param id
142	* a unique ID for the object
143	* @param title
144	* a short description
145	* @param style
146	* a display style (if {@code null}, a default style is created)
147	* @exception IllegalArgumentException
148	* if {@code null} is given as ID or geo object
149	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
150	*/
151	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
152	Translation title, Style style) {
153	this(fc, id, title, null, null, style, null, null);
154	}
155
156	/**
157	* Creates a styled {@link FeatureCollection} with non-translated
158	* informations.
159	*
160	* @param fc
161	* the {@link FeatureCollection}
162	* @param id
163	* a unique ID for the object
164	* @param title
165	* a short description
166	* @param desc
167	* a long description
168	* @param keywords
169	* keywords for the geo objects
170	* @param style
171	* a display style (if {@code null}, a default style is created)
172	* @param attrMetaData
173	* meta data for displaying a legend
174	* @param icon
175	* an icon for the object (can be {@code null})
176	* @exception IllegalArgumentException
177	* if {@code null} is given as ID or geo object
178	*/
179	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
180	String title, String desc, String keywords, Style style,
181	AttributeMetadataMap attrMetaData, ImageIcon icon) {
182	this(fc, id, (Translation) null, null, null, style, attrMetaData, icon);
183	setTitle(title);
184	setDesc(desc);
185	setKeywords(keywords);
186	}
187
188	/**
189	* Creates a styled {@link FeatureCollection} with non-translated
190	* informations.
191	*
192	* @param fc
193	* the {@link FeatureCollection}
194	* @param id
195	* a unique ID for the object
196	* @param title
197	* a short description
198	* @param desc
199	* a long description
200	* @param keywords
201	* keywords for the geo objects
202	* @param style
203	* a display style with attribute meta data information
204	* @param icon
205	* an icon for the object (can be {@code null})
206	* @exception IllegalArgumentException
207	* if {@code null} is given as ID or geo object
208	*/
209	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
210	String title, String desc, String keywords,
211	StyledLayerStyle<AttributeMetadataMap> style,
212	ImageIcon icon) {
213	this(fc, id, title, desc, keywords, style != null ? style
214	.getGeoObjectStyle() : null, style != null ? style
215	.getMetaData() : null, icon);
216	}
217
218	/**
219	* Creates a styled {@link FeatureCollection} with a non-translated title,
220	* no long description, no keywords, default attribute meta data and no
221	* icon.
222	*
223	* @param fc
224	* the {@link FeatureCollection}
225	* @param id
226	* a unique ID for the object
227	* @param title
228	* a short description
229	* @param style
230	* a display style (if {@code null}, a default style is created)
231	* @exception IllegalArgumentException
232	* if {@code null} is given as ID or geo object
233	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
234	*/
235	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
236	String title, Style style) {
237	this(fc, id, title, null, null, style, null, null);
238	}
239
240	/**
241	* Creates a styled {@link FeatureCollection} with a non-translated title,
242	* no long description, no keywords, default attribute meta data and no
243	* icon.
244	*
245	* @param fc
246	* the {@link FeatureCollection}
247	* @param id
248	* a unique ID for the object
249	* @param title
250	* a short description
251	* @param style
252	* a display style (if {@code null}, a default style is created)
253	* @exception IllegalArgumentException
254	* if {@code null} is given as ID or geo object
255	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
256	*/
257	public StyledFeatureCollection(FeatureCollection<SimpleFeatureType,SimpleFeature> fc, String id,
258	String title, StyledLayerStyle<AttributeMetadataMap> style) {
259	this(fc, id, title, null, null, style != null ? style
260	.getGeoObjectStyle() : null, style != null ? style
261	.getMetaData() : null, null);
262	}
263
264	/**
265	* Creates a default style for the {@link FeatureCollection}.
266	*
267	* @see FeatureUtil#createDefaultStyle(FeatureCollection)
268	*/
269	protected Style createDefaultStyle() {
270	return FeatureUtil.createDefaultStyle(geoObject);
271	}
272
273	/**
274	* Returns the meta data needed for displaying a legend.
275	*/
276	public AttributeMetadataMap getAttributeMetaDataMap() {
277	return attrMetaData;
278	}
279
280	/**
281	* Sets the meta data needed for displaying a legend. If {@code legendData}
282	* is {@code null} an empty map is set, so
283	* {@link #getAttributeMetaDataMap()} never returns {@code null}.
284	*
285	* @param attrMetaData
286	* map of attribute meta data
287	*/
288	public void setAttributeMetaData(
289	AttributeMetadataMap attrMetaData) {
290	this.attrMetaData = (attrMetaData != null) ? attrMetaData
291	: createDefaultAttributeMetaDataMap(geoObject);
292	}
293
294	/**
295	* Creates non-translated default meta data for a {@link FeatureCollection}
296	* with all attributes visible and no unit set.
297	*
298	* @param fc
299	* a {@link FeatureCollection}
300	*/
301	public static AttributeMetadataMap createDefaultAttributeMetaDataMap(
302	FeatureCollection<SimpleFeatureType,SimpleFeature> fc) {
303	AttributeMetadataMap metaDataMap = new AttributeMetadataMap();
304	SimpleFeatureType ftype = fc.getSchema();
305	for (int i = 0; i < ftype.getAttributeCount(); i++) {
306	AttributeDescriptor aType = ftype.getAttributeDescriptors().get(i);
307	if (aType != ftype.getGeometryDescriptor())
308	metaDataMap.put(i, new AttributeMetaData(i, // Column no.
309	true, // visible
310	new Translation(aType.getLocalName()), // Column name
311	new Translation(), // description
312	"" // Unit
313	));
314	}
315	return metaDataMap;
316	}
317
318	/**
319	* Simply sets the {@link #geoObject}, {@link #crs}, {@link #envelope} and
320	* {@link #attrMetaData} to {@code null}.
321	*/
322	public void dispose() {
323	this.geoObject = null;
324	this.envelope = null;
325	this.crs = null;
326	this.attrMetaData = null;
327	}
328
329	/**
330	* Tests whether the geo object is disposed.
331	*/
332	public boolean isDisposed() {
333	return geoObject == null;
334	}
335
336	/**
337	* Does nothing, because the {@link AbstractStyledLayer} bases on existing
338	* objects (in memory) which can not be uncached and reloaded.
339	*/
340	public void uncache() {
341
342	/ It will be recreated on the next getFetureSource() /
343	featureSource = null;
344
345	LOGGER
346	.warn("Uncache onyl uncached any virtual FeatureSource. Object remains in memory.");
347	}
348
349	/*
350	* (non-Javadoc)
351	*
352	* @see skrueger.geotools.StyledLayerInterface#getInfoURL()
353	*/
354	public URL getInfoURL() {
355	return null;
356	}
357
358	/**
359	* Same as {@link #getGeoObject()} method, but complies to the {@link StyledFeaturesInterface}
360	* @see {@link StyledFeaturesInterface}
361	*/
362	@Override
363	public FeatureCollection<SimpleFeatureType,SimpleFeature> getFeatureCollection() {
364	return getGeoObject();
365	}
366
367	/**
368	* Returns a virtual {@link FeatureSource} to access the
369	* {@link FeatureCollection}. Once created, it will be reused until
370	* {@link #uncache()} is called.<br/>
371	* @see {@link StyledFeaturesInterface}
372	*/
373	@Override
374	public FeatureSource<SimpleFeatureType,SimpleFeature> getFeatureSource() {
375	if (featureSource == null) {
376	CollectionDataStore store = new CollectionDataStore(getGeoObject());
377	try {
378	featureSource = store.getFeatureSource(store.getTypeNames()[0]);
379	} catch (IOException e) {
380	throw new RuntimeException(
381	"Could not create a FeatureSource from the CollectionDataStore:",
382	e);
383	}
384	}
385	return featureSource;
386	}
387
388	}