Source Code Cross Referenced for FeatureReader.java in  » GIS » GeoTools-2.4.1 » org » geotools » data » 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 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2002-2006, 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;
017:
018:        import java.io.IOException;
019:        import java.util.NoSuchElementException;
020:        import org.geotools.feature.Feature;
021:        import org.geotools.feature.FeatureType;
022:        import org.geotools.feature.IllegalAttributeException;
023:
024:        /**
025:         * The low-level interface for reading Features. Will use the underlying
026:         * AttributeReader and the given FeatureType to create new Features.
027:         *
028:         * <p>
029:         * Typical use is as follows:
030:         * <pre><code>
031:         *   FeatureReader reader = null;
032:         *   try{
033:         *      for( reader = data.getFeatureReader( filter ); reader.hasNext(); ){
034:         *          f = reader.next();
035:         *          ...
036:         *      }
037:         *   }
038:         *   catch (IOException problem){
039:         *      ...
040:         *   }
041:         *   finally {
042:         *      if( reader != null ){
043:         *          try {
044:         *             reader.close();
045:         *          }
046:         *          catch( IOException eek){
047:         *          }
048:         *      }
049:         *   }
050:         * </code></pre>
051:         *
052:         * <h2>Questions and Suggestions</h2>
053:         * <ul>
054:         * <li>Q: Should FeatureReader provide access to the AttributeReaders it uses?
055:         * <br>A:
056:         *       No, it looks like we will make a lazy Feature in order to cleanly
057:         *       allow for lazy parsing of attribtues.
058:         * </li>
059:         * <li>Q:FeatureReader has a close method, but no open method?
060:         * <br>A: This is by design allowing FeatureReader to encapsulate its InputStream
061:         *     or Rowset). Please assume that FeatureReaders are a single use proposition.
062:         * </li>
063:         * <li>Q: All that exception handling is a pain!
064:         *     A:
065:         *        Yes it is, we have constructed semi-normal Java iterators to cut down on the
066:         *        pain. But you *do* still have to close 'em - this is IO after all.
067:         * </li>
068:         * <li>Q: Can we include skip(int) - SeanG
069:         *     A:
070:         *        The order of the contents is not "known" or predicatable to the end user, so
071:         *        skip( int ) would be useless. For random access (a higher order
072:         *        of abstraction then FeatureReader) please look at FeatureList.
073:         * </li>
074:         * </ul>
075:         * </p>
076:         *
077:         * @author Ian Schneider
078:         * @author Sean Geoghegan, Defence Science and Technology Organisation.
079:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/api/src/main/java/org/geotools/data/FeatureReader.java $
080:         * @version $Id: FeatureReader.java 22294 2006-10-20 00:55:40Z desruisseaux $
081:         */
082:        public interface FeatureReader {
083:            /**
084:             * Return the FeatureType this reader has been configured to create.
085:             *
086:             * @return the FeatureType of the Features this FeatureReader will create.
087:             */
088:            FeatureType getFeatureType();
089:
090:            /**
091:             * Reads the next Feature in the FeatureReader.
092:             *
093:             * @return The next feature in the reader.
094:             *
095:             * @throws IOException If an error occurs reading the Feature.
096:             * @throws IllegalAttributeException If the attributes read do not comply
097:             *         with the FeatureType.
098:             * @throws NoSuchElementException If there are no more Features in the
099:             *         Reader.
100:             */
101:            Feature next() throws IOException, IllegalAttributeException,
102:                    NoSuchElementException;
103:
104:            /**
105:             * Query whether this FeatureReader has another Feature.
106:             *
107:             * @return True if there are more Features to be read. In other words, true
108:             *         if calls to next would return a feature rather than throwing an
109:             *         exception.
110:             *
111:             * @throws IOException If an error occurs determining if there are more
112:             *         Features.
113:             */
114:            boolean hasNext() throws IOException;
115:
116:            /**
117:             * Release the underlying resources associated with this stream.
118:             *
119:             * @throws IOException DOCUMENT ME!
120:             */
121:            void close() throws IOException;
122:        }
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