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. Tzeggai - 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.NameImpl;
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.AttributeMetadataImpl;
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<AttributeMetadataImpl> 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 AttributeMetadataImplMap();
                SimpleFeatureType ftype = fc.getSchema();
                for (int i = 0; i < ftype.getAttributeCount(); i++) {
                        AttributeDescriptor aDesc = ftype.getAttributeDescriptors().get(i);
                        if ( !FeatureUtil.isGeometryAttribute(aDesc) )
                                metaDataMap.put(aDesc.getName(), new AttributeMetadataImpl( new NameImpl( aDesc.getName().getNamespaceURI(), aDesc.getName().getLocalPart()), 
                                                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. Tzeggai - 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.NameImpl;
42	import org.geotools.feature.collection.SubFeatureCollection;
43	import org.geotools.styling.Style;
44	import org.opengis.feature.simple.SimpleFeature;
45	import org.opengis.feature.simple.SimpleFeatureType;
46	import org.opengis.feature.type.AttributeDescriptor;
47	import org.opengis.filter.Filter;
48
49	import schmitzm.geotools.feature.FeatureUtil;
50	import skrueger.AttributeMetadataImpl;
51	import skrueger.i8n.Translation;
52
53	/**
54	* This class provides a simple implementation of {@link StyledLayerInterface}
55	* for {@link FeatureCollection}. The uncache functionality is not supported,
56	* because this class bases on an existing {@link FeatureCollection} object in
57	* memory.
58	*
59	* @author <a href="mailto:[email protected]">Martin Schmitz</a>
60	* (University of Bonn/Germany)
61	* @version 1.0
62	*/
63	public class StyledFeatureCollection
64	extends
65	AbstractStyledLayer<FeatureCollection<SimpleFeatureType, SimpleFeature>>
66	implements StyledFeatureCollectionInterface {
67
68	/** Holds the meta data for displaying a legend. */
69	protected AttributeMetadataMap<AttributeMetadataImpl> attrMetaData = null;
70
71	/**
72	* We be filled with a "virtual" {@link FeatureSource} on demand.
73	*/
74	private FeatureSource<SimpleFeatureType, SimpleFeature> featureSource = null;
75
76	/**
77	* A Filter that will be applied internally applied to this
78	* FeatureCollection
79	**/
80	private Filter filter = Filter.INCLUDE;
81
82	/**
83	* Creates a styled {@link FeatureCollection} with language-specific
84	* informations.
85	*
86	* @param fc
87	* the {@link FeatureCollection}
88	* @param id
89	* a unique ID for the object
90	* @param title
91	* a (language-specific) short description
92	* @param desc
93	* a (language-specific) long description
94	* @param keywords
95	* (language-specific) keywords for the geo objects
96	* @param style
97	* a display style (if {@code null}, a default style is created)
98	* @param attrMetaData
99	* meta data for displaying a legend
100	* @param icon
101	* an icon for the object (can be {@code null})
102	* @exception IllegalArgumentException
103	* if {@code null} is given as ID or geo object
104	*/
105	public StyledFeatureCollection(
106	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
107	Translation title, Translation desc, Translation keywords,
108	Style style, AttributeMetadataMap attrMetaData, ImageIcon icon) {
109	super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
110	.getCoordinateReferenceSystem(), id, title, desc, keywords,
111	style, icon);
112	setAttributeMetaData(attrMetaData);
113	}
114
115	/**
116	* Creates a styled {@link FeatureCollection} with language-specific
117	* informations.
118	*
119	* @param fc
120	* the {@link FeatureCollection}
121	* @param id
122	* a unique ID for the object
123	* @param title
124	* a (language-specific) short description
125	* @param desc
126	* a (language-specific) long description
127	* @param keywords
128	* (language-specific) keywords for the geo objects
129	* @param style
130	* a display style with attribute meta data information
131	* @param icon
132	* an icon for the object (can be {@code null})
133	* @exception IllegalArgumentException
134	* if {@code null} is given as ID or geo object
135	*/
136	public StyledFeatureCollection(
137	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
138	Translation title, Translation desc, Translation keywords,
139	StyledLayerStyle<AttributeMetadataMap> style, ImageIcon icon) {
140	super(fc, fc.getBounds(), fc.getSchema().getGeometryDescriptor()
141	.getCoordinateReferenceSystem(), id, title, desc, keywords,
142	style != null ? style.getGeoObjectStyle() : null, icon);
143	setAttributeMetaData(style != null ? style.getMetaData() : null);
144	}
145
146	/**
147	* Creates a styled {@link FeatureCollection} with a language-specific
148	* title, no long description, no keywords, default attribute meta data and
149	* no icon.
150	*
151	* @param fc
152	* the {@link FeatureCollection}
153	* @param id
154	* a unique ID for the object
155	* @param title
156	* a short description
157	* @param style
158	* a display style (if {@code null}, a default style is created)
159	* @exception IllegalArgumentException
160	* if {@code null} is given as ID or geo object
161	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
162	*/
163	public StyledFeatureCollection(
164	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
165	Translation title, Style style) {
166	this(fc, id, title, null, null, style, null, null);
167	}
168
169	/**
170	* Creates a styled {@link FeatureCollection} with non-translated
171	* informations.
172	*
173	* @param fc
174	* the {@link FeatureCollection}
175	* @param id
176	* a unique ID for the object
177	* @param title
178	* a short description
179	* @param desc
180	* a long description
181	* @param keywords
182	* keywords for the geo objects
183	* @param style
184	* a display style (if {@code null}, a default style is created)
185	* @param attrMetaData
186	* meta data for displaying a legend
187	* @param icon
188	* an icon for the object (can be {@code null})
189	* @exception IllegalArgumentException
190	* if {@code null} is given as ID or geo object
191	*/
192	public StyledFeatureCollection(
193	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
194	String title, String desc, String keywords, Style style,
195	AttributeMetadataMap attrMetaData, ImageIcon icon) {
196	this(fc, id, (Translation) null, null, null, style, attrMetaData, icon);
197	setTitle(title);
198	setDesc(desc);
199	setKeywords(keywords);
200	}
201
202	/**
203	* Creates a styled {@link FeatureCollection} with non-translated
204	* informations.
205	*
206	* @param fc
207	* the {@link FeatureCollection}
208	* @param id
209	* a unique ID for the object
210	* @param title
211	* a short description
212	* @param desc
213	* a long description
214	* @param keywords
215	* keywords for the geo objects
216	* @param style
217	* a display style with attribute meta data information
218	* @param icon
219	* an icon for the object (can be {@code null})
220	* @exception IllegalArgumentException
221	* if {@code null} is given as ID or geo object
222	*/
223	public StyledFeatureCollection(
224	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
225	String title, String desc, String keywords,
226	StyledLayerStyle<AttributeMetadataMap> style, ImageIcon icon) {
227	this(fc, id, title, desc, keywords, style != null ? style
228	.getGeoObjectStyle() : null, style != null ? style
229	.getMetaData() : null, icon);
230	}
231
232	/**
233	* Creates a styled {@link FeatureCollection} with a non-translated title,
234	* no long description, no keywords, default attribute meta data and no
235	* icon.
236	*
237	* @param fc
238	* the {@link FeatureCollection}
239	* @param id
240	* a unique ID for the object
241	* @param title
242	* a short description
243	* @param style
244	* a display style (if {@code null}, a default style is created)
245	* @exception IllegalArgumentException
246	* if {@code null} is given as ID or geo object
247	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
248	*/
249	public StyledFeatureCollection(
250	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
251	String title, Style style) {
252	this(fc, id, title, null, null, style, null, null);
253	}
254
255	/**
256	* Creates a styled {@link FeatureCollection} with a non-translated title,
257	* no long description, no keywords, default attribute meta data and no
258	* icon.
259	*
260	* @param fc
261	* the {@link FeatureCollection}
262	* @param id
263	* a unique ID for the object
264	* @param title
265	* a short description
266	* @param style
267	* a display style (if {@code null}, a default style is created)
268	* @exception IllegalArgumentException
269	* if {@code null} is given as ID or geo object
270	* @see #createDefaultAttributeMetaDataMap(FeatureCollection)
271	*/
272	public StyledFeatureCollection(
273	FeatureCollection<SimpleFeatureType, SimpleFeature> fc, String id,
274	String title, StyledLayerStyle<AttributeMetadataMap> style) {
275	this(fc, id, title, null, null, style != null ? style
276	.getGeoObjectStyle() : null, style != null ? style
277	.getMetaData() : null, null);
278	}
279
280	/**
281	* Creates a default style for the {@link FeatureCollection}.
282	*
283	* @see FeatureUtil#createDefaultStyle(FeatureCollection)
284	*/
285	protected Style createDefaultStyle() {
286	return FeatureUtil.createDefaultStyle(geoObject);
287	}
288
289	/**
290	* Returns the meta data needed for displaying a legend.
291	*/
292	public AttributeMetadataMap getAttributeMetaDataMap() {
293	return attrMetaData;
294	}
295
296	/**
297	* Sets the meta data needed for displaying a legend. If {@code legendData}
298	* is {@code null} an empty map is set, so
299	* {@link #getAttributeMetaDataMap()} never returns {@code null}.
300	*
301	* @param attrMetaData
302	* map of attribute meta data
303	*/
304	public void setAttributeMetaData(AttributeMetadataMap attrMetaData) {
305	this.attrMetaData = (attrMetaData != null) ? attrMetaData
306	: createDefaultAttributeMetaDataMap(geoObject);
307	}
308
309	/**
310	* Creates non-translated default meta data for a {@link FeatureCollection}
311	* with all attributes visible and no unit set.
312	*
313	* @param fc
314	* a {@link FeatureCollection}
315	*/
316	public static AttributeMetadataMap createDefaultAttributeMetaDataMap(
317	FeatureCollection<SimpleFeatureType, SimpleFeature> fc) {
318	AttributeMetadataMap metaDataMap = new AttributeMetadataImplMap();
319	SimpleFeatureType ftype = fc.getSchema();
320	for (int i = 0; i < ftype.getAttributeCount(); i++) {
321	AttributeDescriptor aDesc = ftype.getAttributeDescriptors().get(i);
322	if ( !FeatureUtil.isGeometryAttribute(aDesc) )
323	metaDataMap.put(aDesc.getName(), new AttributeMetadataImpl( new NameImpl( aDesc.getName().getNamespaceURI(), aDesc.getName().getLocalPart()),
324	true, // visible
325	new Translation(aDesc.getLocalName()), // Column name
326	new Translation(aDesc.getLocalName()), // description
327	"" // Unit
328	));
329	}
330	return metaDataMap;
331	}
332
333	/**
334	* Simply sets the {@link #geoObject}, {@link #crs}, {@link #envelope} and
335	* {@link #attrMetaData} to {@code null}.
336	*/
337	public void dispose() {
338	this.geoObject = null;
339	this.envelope = null;
340	this.crs = null;
341	this.attrMetaData = null;
342	}
343
344	/**
345	* Tests whether the geo object is disposed.
346	*/
347	public boolean isDisposed() {
348	return geoObject == null;
349	}
350
351	/**
352	* Does nothing, because the {@link AbstractStyledLayer} bases on existing
353	* objects (in memory) which can not be uncached and reloaded.
354	*/
355	public void uncache() {
356
357	/ It will be recreated on the next getFetureSource() /
358	featureSource = null;
359
360	LOGGER
361	.warn("Uncache onyl uncached any virtual FeatureSource. Object remains in memory.");
362	}
363
364	/*
365	* (non-Javadoc)
366	*
367	* @see skrueger.geotools.StyledLayerInterface#getInfoURL()
368	*/
369	public URL getInfoURL() {
370	return null;
371	}
372
373	/**
374	* Same as {@link #getGeoObject()} method, but complies to the
375	* {@link StyledFeaturesInterface}. The associated {@link Filter} is NOT
376	* automatically applied.
377	*
378	* @see {@link StyledFeaturesInterface}
379	* @see #getFeatureCollectionFiltered()
380	*/
381	@Override
382	public FeatureCollection<SimpleFeatureType, SimpleFeature> getFeatureCollection() {
383	return getGeoObject();
384	}
385
386	/**
387	* Same as {@link #getGeoObject()} method, but complies to the
388	* {@link StyledFeaturesInterface}. The associated {@link Filter} is
389	* automatically applied by creating a {@link SubFeatureCollection}.
390	*
391	* @see {@link StyledFeaturesInterface}
392	* @see #getFeatureCollectionFiltered()
393	*/
394	@Override
395	public FeatureCollection<SimpleFeatureType, SimpleFeature> getFeatureCollectionFiltered() {
396	final FeatureCollection<SimpleFeatureType, SimpleFeature> fc = getFeatureCollection();
397	if (filter == Filter.EXCLUDE)
398	return new EmptyFeatureCollection(fc.getSchema());
399	if (filter == Filter.INCLUDE)
400	return fc;
401	return fc.subCollection(filter);
402	}
403
404	/**
405	* Returns a virtual {@link FeatureSource} to access the
406	* {@link FeatureCollection}. Once created, it will be reused until
407	* {@link #uncache()} is called.<br/>
408	*
409	* @see {@link StyledFeaturesInterface}
410	*/
411	@Override
412	public FeatureSource<SimpleFeatureType, SimpleFeature> getFeatureSource() {
413	if (featureSource == null) {
414	CollectionDataStore store = new CollectionDataStore(getGeoObject());
415	try {
416	featureSource = store.getFeatureSource(store.getTypeNames()[0]);
417	} catch (IOException e) {
418	throw new RuntimeException(
419	"Could not create a FeatureSource from the CollectionDataStore:",
420	e);
421	}
422	}
423	return featureSource;
424	}
425
426	@Override
427	public Filter getFilter() {
428	return filter;
429	}
430
431	@Override
432	public void setFilter(Filter filter) {
433	this.filter = filter;
434	}
435
436	@Override
437	public SimpleFeatureType getSchema() {
438	return getGeoObject().getSchema();
439	}
440
441
442	}