Source Code Cross Referenced for FeatureWriterIterator.java in  » GIS » GeoTools-2.4.1 » org » geotools » data » store » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.data.store 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2004-2006, GeoTools Project Managment Committee (PMC)
005:         *    
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation;
009:         *    version 2.1 of the License.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         */
016:        package org.geotools.data.store;
017:
018:        import java.io.IOException;
019:        import java.util.Iterator;
020:        import java.util.NoSuchElementException;
021:
022:        import org.geotools.data.FeatureWriter;
023:
024:        /**
025:         * An iterator wrapper for a FeatureWriter - for use with
026:         * an AbstractFeatureCollection.
027:         * <p>
028:         * There is no reason modify this class, subclasses that wish
029:         * to work with a custom iterator need just that - a custom iterator.
030:         * <p>
031:         * <p>
032:         * The use of this class against a FeatureSource not backed by
033:         * a Transaction may *really* cut into performance. Consider if
034:         * you will the overhead involved in writing out each feature into
035:         * a temporary file (when the user may not even modify anything).
036:         * </p>
037:         * @author jgarnett
038:         * @since 2.1.RC0
039:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/main/src/main/java/org/geotools/data/store/FeatureWriterIterator.java $
040:         */
041:        final class FeatureWriterIterator implements  Iterator {
042:            FeatureWriter writer;
043:
044:            public FeatureWriterIterator(FeatureWriter writer) {
045:                this .writer = writer;
046:            }
047:
048:            public boolean hasNext() {
049:                try {
050:                    if (writer == null) {
051:                        return false;
052:                    }
053:                    writer.write(); // write out any "changes" made
054:                    if (writer.hasNext()) {
055:                        return true;
056:                    } else {
057:                        close();
058:                        return false;
059:                        // auto close because we don't trust client
060:                        // code to call close 
061:                    }
062:                } catch (IOException e) {
063:                    close();
064:                    return false; // failure sounds like lack of next to me
065:                }
066:            }
067:
068:            public Object next() {
069:                if (writer == null) {
070:                    throw new NoSuchElementException("Iterator has been closed");
071:                }
072:                try {
073:                    return writer.next();
074:                } catch (IOException io) {
075:                    NoSuchElementException problem = new NoSuchElementException(
076:                            "Could not obtain the next feature:" + io);
077:                    problem.initCause(io);
078:                    throw problem;
079:                }
080:            }
081:
082:            public void remove() {
083:                try {
084:                    writer.remove();
085:                } catch (IOException problem) {
086:                    throw (IllegalStateException) new IllegalStateException(
087:                            "Could not remove feature").initCause(problem);
088:                }
089:            }
090:
091:            /**
092:             * This method only needs package visability as only AbstractFeatureCollection
093:             * is trusted enough to call it.
094:             */
095:            void close() {
096:                if (writer != null) {
097:                    try {
098:                        writer.close();
099:                    } catch (IOException e) {
100:                        // sorry but iterators die quitely in the night
101:                    }
102:                    writer = null;
103:                }
104:            }
105:        };
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