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.data.store.EmptyFeatureCollection;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.collection.SubFeatureCollection;
import org.geotools.styling.Style;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.filter.Filter;

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;

        /**
         * A Filter that will be applied internally applied to this
         * FeatureCollection
         **/
        private Filter filter = Filter.INCLUDE;

        /**
         * 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 aDesc = ftype.getAttributeDescriptors().get(i);
                        if (aDesc != ftype.getGeometryDescriptor())
                                metaDataMap.put(aDesc.getName(), new AttributeMetadata(aDesc.getName(), 
                                                true, // visible
                                                new Translation(aDesc.getLocalName()), // Column name
                                                new Translation(aDesc.getLocalName()), // 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}. The associated {@link Filter} is NOT
         * automatically applied.
         * 
         * @see {@link StyledFeaturesInterface}
         * @see #getFeatureCollectionFiltered()
         */
        @Override
        public FeatureCollection<SimpleFeatureType, SimpleFeature> getFeatureCollection() {
                return getGeoObject();
        }

        /**
         * Same as {@link #getGeoObject()} method, but complies to the
         * {@link StyledFeaturesInterface}. The associated {@link Filter} is
         * automatically applied by creating a {@link SubFeatureCollection}.
         * 
         * @see {@link StyledFeaturesInterface}
         * @see #getFeatureCollectionFiltered()
         */
        @Override
        public FeatureCollection<SimpleFeatureType, SimpleFeature> getFeatureCollectionFiltered() {
                final FeatureCollection<SimpleFeatureType, SimpleFeature> fc = getFeatureCollection();
                if (filter == Filter.EXCLUDE)
                        return new EmptyFeatureCollection(fc.getSchema());
                if (filter == Filter.INCLUDE)
                        return fc;
                return fc.subCollection(filter);
        }

        /**
         * 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;
        }

        @Override
        public Filter getFilter() {
                return filter;
        }

        @Override
        public void setFilter(Filter filter) {
                this.filter = filter;
        }

        @Override
        public SimpleFeatureType getSchema() {
                return getGeoObject().getSchema();
        }


}
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.data.store.EmptyFeatureCollection;
40	import org.geotools.feature.FeatureCollection;
41	import org.geotools.feature.collection.SubFeatureCollection;
42	import org.geotools.styling.Style;
43	import org.opengis.feature.simple.SimpleFeature;
44	import org.opengis.feature.simple.SimpleFeatureType;
45	import org.opengis.feature.type.AttributeDescriptor;
46	import org.opengis.filter.Filter;
47
48	import schmitzm.geotools.feature.FeatureUtil;
49	import skrueger.AttributeMetadata;
50	import skrueger.i8n.Translation;
51
52	/**
53	* This class provides a simple implementation of {@link StyledLayerInterface}
54	* for {@link FeatureCollection}. The uncache functionality is not supported,
55	* because this class bases on an existing {@link FeatureCollection} object in
56	* memory.
57	*
58	* @author <a href="mailto:[email protected]">Martin Schmitz</a>
59	* (University of Bonn/Germany)
60	* @version 1.0
61	*/
62	public class StyledFeatureCollection
63	extends
64	AbstractStyledLayer<FeatureCollection<SimpleFeatureType, SimpleFeature>>
65	implements StyledFeatureCollectionInterface {
66
67	/** Holds the meta data for displaying a legend. */
68	protected AttributeMetadataMap attrMetaData = null;
69
70	/**
71	* We be filled with a "virtual" {@link FeatureSource} on demand.
72	*/
73	private FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = null;
74
75	/**
76	* A Filter that will be applied internally applied to this
77	* FeatureCollection
78	**/
79	private Filter filter = Filter.INCLUDE;
80
81	/**
82	* Creates a styled {@link FeatureCollection} with language-specific
83	* informations.
84	*
85	* @param fc
86	* the {@link FeatureCollection}
87	* @param id
88	* a unique ID for the object
89	* @param title
90	* a (language-specific) short description
91	* @param desc
92	* a (language-specific) long description
93	* @param keywords
94	* (language-specific) keywords for the geo objects
95	* @param style
96	* a display style (if {@code null}, a default style is created)
97	* @param attrMetaData
98	* meta data for displaying a legend
99	* @param icon
100	* an icon for the object (can be {@code null})
101	* @exception IllegalArgumentException
102	* if {@code null} is given as ID or geo object
103	*/
104	public StyledFeatureCollection(
105	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
106	Translation title, Translation desc, Translation keywords,
107	Style style, AttributeMetadataMap attrMetaData, ImageIcon icon) {
108	super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
109	.getCoordinateReferenceSystem(), id, title, desc, keywords,
110	style, icon);
111	setAttributeMetaData(attrMetaData);
112	}
113
114	/**
115	* Creates a styled {@link FeatureCollection} with language-specific
116	* informations.
117	*
118	* @param fc
119	* the {@link FeatureCollection}
120	* @param id
121	* a unique ID for the object
122	* @param title
123	* a (language-specific) short description
124	* @param desc
125	* a (language-specific) long description
126	* @param keywords
127	* (language-specific) keywords for the geo objects
128	* @param style
129	* a display style with attribute meta data information
130	* @param icon
131	* an icon for the object (can be {@code null})
132	* @exception IllegalArgumentException
133	* if {@code null} is given as ID or geo object
134	*/
135	public StyledFeatureCollection(
136	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
137	Translation title, Translation desc, Translation keywords,
138	StyledLayerStyle<AttributeMetadataMap> style, ImageIcon icon) {
139	super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
140	.getCoordinateReferenceSystem(), id, title, desc, keywords,
141	style != null ? style.getGeoObjectStyle() : null, icon);
142	setAttributeMetaData(style != null ? style.getMetaData() : null);
143	}
144
145	/**
146	* Creates a styled {@link FeatureCollection} with a language-specific
147	* title, no long description, no keywords, default attribute meta data and
148	* no icon.
149	*
150	* @param fc
151	* the {@link FeatureCollection}
152	* @param id
153	* a unique ID for the object
154	* @param title
155	* a short description
156	* @param style
157	* a display style (if {@code null}, a default style is created)
158	* @exception IllegalArgumentException
159	* if {@code null} is given as ID or geo object
160	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
161	*/
162	public StyledFeatureCollection(
163	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
164	Translation title, Style style) {
165	this(fc, id, title, null, null, style, null, null);
166	}
167
168	/**
169	* Creates a styled {@link FeatureCollection} with non-translated
170	* informations.
171	*
172	* @param fc
173	* the {@link FeatureCollection}
174	* @param id
175	* a unique ID for the object
176	* @param title
177	* a short description
178	* @param desc
179	* a long description
180	* @param keywords
181	* keywords for the geo objects
182	* @param style
183	* a display style (if {@code null}, a default style is created)
184	* @param attrMetaData
185	* meta data for displaying a legend
186	* @param icon
187	* an icon for the object (can be {@code null})
188	* @exception IllegalArgumentException
189	* if {@code null} is given as ID or geo object
190	*/
191	public StyledFeatureCollection(
192	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
193	String title, String desc, String keywords, Style style,
194	AttributeMetadataMap attrMetaData, ImageIcon icon) {
195	this(fc, id, (Translation) null, null, null, style, attrMetaData, icon);
196	setTitle(title);
197	setDesc(desc);
198	setKeywords(keywords);
199	}
200
201	/**
202	* Creates a styled {@link FeatureCollection} with non-translated
203	* informations.
204	*
205	* @param fc
206	* the {@link FeatureCollection}
207	* @param id
208	* a unique ID for the object
209	* @param title
210	* a short description
211	* @param desc
212	* a long description
213	* @param keywords
214	* keywords for the geo objects
215	* @param style
216	* a display style with attribute meta data information
217	* @param icon
218	* an icon for the object (can be {@code null})
219	* @exception IllegalArgumentException
220	* if {@code null} is given as ID or geo object
221	*/
222	public StyledFeatureCollection(
223	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
224	String title, String desc, String keywords,
225	StyledLayerStyle<AttributeMetadataMap> style, ImageIcon icon) {
226	this(fc, id, title, desc, keywords, style != null ? style
227	.getGeoObjectStyle() : null, style != null ? style
228	.getMetaData() : null, icon);
229	}
230
231	/**
232	* Creates a styled {@link FeatureCollection} with a non-translated title,
233	* no long description, no keywords, default attribute meta data and no
234	* icon.
235	*
236	* @param fc
237	* the {@link FeatureCollection}
238	* @param id
239	* a unique ID for the object
240	* @param title
241	* a short description
242	* @param style
243	* a display style (if {@code null}, a default style is created)
244	* @exception IllegalArgumentException
245	* if {@code null} is given as ID or geo object
246	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
247	*/
248	public StyledFeatureCollection(
249	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
250	String title, Style style) {
251	this(fc, id, title, null, null, style, null, null);
252	}
253
254	/**
255	* Creates a styled {@link FeatureCollection} with a non-translated title,
256	* no long description, no keywords, default attribute meta data and no
257	* icon.
258	*
259	* @param fc
260	* the {@link FeatureCollection}
261	* @param id
262	* a unique ID for the object
263	* @param title
264	* a short description
265	* @param style
266	* a display style (if {@code null}, a default style is created)
267	* @exception IllegalArgumentException
268	* if {@code null} is given as ID or geo object
269	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
270	*/
271	public StyledFeatureCollection(
272	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
273	String title, StyledLayerStyle<AttributeMetadataMap> style) {
274	this(fc, id, title, null, null, style != null ? style
275	.getGeoObjectStyle() : null, style != null ? style
276	.getMetaData() : null, null);
277	}
278
279	/**
280	* Creates a default style for the {@link FeatureCollection}.
281	*
282	* @see FeatureUtil#createDefaultStyle(FeatureCollection)
283	*/
284	protected Style createDefaultStyle() {
285	return FeatureUtil.createDefaultStyle(geoObject);
286	}
287
288	/**
289	* Returns the meta data needed for displaying a legend.
290	*/
291	public AttributeMetadataMap getAttributeMetaDataMap() {
292	return attrMetaData;
293	}
294
295	/**
296	* Sets the meta data needed for displaying a legend. If {@code legendData}
297	* is {@code null} an empty map is set, so
298	* {@link #getAttributeMetaDataMap()} never returns {@code null}.
299	*
300	* @param attrMetaData
301	* map of attribute meta data
302	*/
303	public void setAttributeMetaData(AttributeMetadataMap attrMetaData) {
304	this.attrMetaData = (attrMetaData != null) ? attrMetaData
305	: createDefaultAttributeMetaDataMap(geoObject);
306	}
307
308	/**
309	* Creates non-translated default meta data for a {@link FeatureCollection}
310	* with all attributes visible and no unit set.
311	*
312	* @param fc
313	* a {@link FeatureCollection}
314	*/
315	public static AttributeMetadataMap createDefaultAttributeMetaDataMap(
316	FeatureCollection<SimpleFeatureType, SimpleFeature> fc) {
317	AttributeMetadataMap metaDataMap = new AttributeMetadataMap();
318	SimpleFeatureType ftype = fc.getSchema();
319	for (int i = 0; i < ftype.getAttributeCount(); i++) {
320	AttributeDescriptor aDesc = ftype.getAttributeDescriptors().get(i);
321	if (aDesc != ftype.getGeometryDescriptor())
322	metaDataMap.put(aDesc.getName(), new AttributeMetadata(aDesc.getName(),
323	true, // visible
324	new Translation(aDesc.getLocalName()), // Column name
325	new Translation(aDesc.getLocalName()), // description
326	"" // Unit
327	));
328	}
329	return metaDataMap;
330	}
331
332	/**
333	* Simply sets the {@link #geoObject}, {@link #crs}, {@link #envelope} and
334	* {@link #attrMetaData} to {@code null}.
335	*/
336	public void dispose() {
337	this.geoObject = null;
338	this.envelope = null;
339	this.crs = null;
340	this.attrMetaData = null;
341	}
342
343	/**
344	* Tests whether the geo object is disposed.
345	*/
346	public boolean isDisposed() {
347	return geoObject == null;
348	}
349
350	/**
351	* Does nothing, because the {@link AbstractStyledLayer} bases on existing
352	* objects (in memory) which can not be uncached and reloaded.
353	*/
354	public void uncache() {
355
356	/ It will be recreated on the next getFetureSource() /
357	featureSource = null;
358
359	LOGGER
360	.warn("Uncache onyl uncached any virtual FeatureSource. Object remains in memory.");
361	}
362
363	/*
364	* (non-Javadoc)
365	*
366	* @see skrueger.geotools.StyledLayerInterface#getInfoURL()
367	*/
368	public URL getInfoURL() {
369	return null;
370	}
371
372	/**
373	* Same as {@link #getGeoObject()} method, but complies to the
374	* {@link StyledFeaturesInterface}. The associated {@link Filter} is NOT
375	* automatically applied.
376	*
377	* @see {@link StyledFeaturesInterface}
378	* @see #getFeatureCollectionFiltered()
379	*/
380	@Override
381	public FeatureCollection<SimpleFeatureType, SimpleFeature> getFeatureCollection() {
382	return getGeoObject();
383	}
384
385	/**
386	* Same as {@link #getGeoObject()} method, but complies to the
387	* {@link StyledFeaturesInterface}. The associated {@link Filter} is
388	* automatically applied by creating a {@link SubFeatureCollection}.
389	*
390	* @see {@link StyledFeaturesInterface}
391	* @see #getFeatureCollectionFiltered()
392	*/
393	@Override
394	public FeatureCollection<SimpleFeatureType, SimpleFeature> getFeatureCollectionFiltered() {
395	final FeatureCollection<SimpleFeatureType, SimpleFeature> fc = getFeatureCollection();
396	if (filter == Filter.EXCLUDE)
397	return new EmptyFeatureCollection(fc.getSchema());
398	if (filter == Filter.INCLUDE)
399	return fc;
400	return fc.subCollection(filter);
401	}
402
403	/**
404	* Returns a virtual {@link FeatureSource} to access the
405	* {@link FeatureCollection}. Once created, it will be reused until
406	* {@link #uncache()} is called.<br/>
407	*
408	* @see {@link StyledFeaturesInterface}
409	*/
410	@Override
411	public FeatureSource<SimpleFeatureType, SimpleFeature> getFeatureSource() {
412	if (featureSource == null) {
413	CollectionDataStore store = new CollectionDataStore(getGeoObject());
414	try {
415	featureSource = store.getFeatureSource(store.getTypeNames()[0]);
416	} catch (IOException e) {
417	throw new RuntimeException(
418	"Could not create a FeatureSource from the CollectionDataStore:",
419	e);
420	}
421	}
422	return featureSource;
423	}
424
425	@Override
426	public Filter getFilter() {
427	return filter;
428	}
429
430	@Override
431	public void setFilter(Filter filter) {
432	this.filter = filter;
433	}
434
435	@Override
436	public SimpleFeatureType getSchema() {
437	return getGeoObject().getSchema();
438	}
439
440
441	}