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


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2005-2006, 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; either
009:         *    version 2.1 of the License, or (at your option) any later version.
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;
017:
018:        // J2SE dependencies
019:        import java.io.BufferedReader;
020:        import java.io.File;
021:        import java.io.FileNotFoundException;
022:        import java.io.FileOutputStream;
023:        import java.io.IOException;
024:        import java.io.InputStream;
025:        import java.io.LineNumberReader;
026:        import java.io.OutputStream;
027:        import java.net.URL;
028:        import java.nio.channels.ReadableByteChannel;
029:
030:        /**
031:         * Provides access to the common {@code test-data} directories provided in the
032:         * {@code sample-data} module. This directory is shared by test suites in other
033:         * modules.
034:         * <p>
035:         * This file has to live in the {@code org.geotools} root package in order to
036:         * get access to the {@code org/geotools/test-data} directory. If you don't
037:         * need this directory, then use the {@link org.geotools.test.TestData}
038:         * class provided in the {@code org.geotools.resources} directory.
039:         *
040:         * @since 2.2
041:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/sample-data/src/main/java/org/geotools/TestData.java $
042:         * @version $Id: TestData.java 24085 2007-01-27 21:19:05Z desruisseaux $
043:         * @author Martin Desruisseaux
044:         *
045:         * @tutorial http://www.geotools.org/display/GEOT/5.8+Test+Data
046:         */
047:        public final class TestData extends org.geotools.test.TestData {
048:            /**
049:             * Do not allow instantiation of this class.
050:             */
051:            private TestData() {
052:            }
053:
054:            /**
055:             * Access to <code>{@linkplain #getResource getResource}(name)</code> as a non-null
056:             * {@link URL}. At the difference of {@code getResource}, this method throws an exception if
057:             * the resource is not found. This provides a more explicit explanation about the failure
058:             * reason than the infamous {@link NullPointerException}.
059:             *
060:             * @param  name Path to file in {@code org/geotools/test-data}.
061:             * @return The URL to the {@code test-data} resource.
062:             * @throws FileNotFoundException if the resource is not found.
063:             */
064:            public static URL url(final String name)
065:                    throws FileNotFoundException {
066:                return url(TestData.class, name);
067:            }
068:
069:            /**
070:             * Access to <code>{@linkplain #getResource getResource}(name)</code> as a non-null
071:             * {@link File}. You can access the {@code test-data} directory with:
072:             *
073:             * <blockquote><pre>
074:             * TestData.file(null);
075:             * </pre></blockquote>
076:             *
077:             * @param  name Path to file in {@code org/geotools/test-data}.
078:             * @return The file to the {@code test-data} resource.
079:             * @throws FileNotFoundException if the file is not found.
080:             * @throws IOException if the resource can't be fetched for an other reason.
081:             */
082:            public static File file(final String name) throws IOException {
083:                return file(TestData.class, name);
084:            }
085:
086:            /**
087:             * Provides a non-null {@link InputStream} for named test data.
088:             * It is the caller responsability to close this stream after usage.
089:             *
090:             * @param  name Path to file in {@code org/geotools/test-data}.
091:             * @return The input stream.
092:             * @throws FileNotFoundException if the resource is not found.
093:             * @throws IOException if an error occurs during an input operation.
094:             */
095:            public static InputStream openStream(final String name)
096:                    throws IOException {
097:                return openStream(TestData.class, name);
098:            }
099:
100:            /**
101:             * Provides a {@link BufferedReader} for named test data. The buffered reader is provided as
102:             * an {@link LineNumberReader} instance, which is useful for displaying line numbers where
103:             * error occur. It is the caller responsability to close this reader after usage.
104:             *
105:             * @param  name Path to file in {@code org/geotools/test-data}.
106:             * @return The buffered reader.
107:             * @throws FileNotFoundException if the resource is not found.
108:             * @throws IOException if an error occurs during an input operation.
109:             */
110:            public static LineNumberReader openReader(final String name)
111:                    throws IOException {
112:                return openReader(TestData.class, name);
113:            }
114:
115:            /**
116:             * Provides a channel for named test data. It is the caller responsability to close this
117:             * chanel after usage.
118:             *
119:             * @param  name Path to file in {@code org/geotools/test-data}.
120:             * @return The chanel.
121:             * @throws FileNotFoundException if the resource is not found.
122:             * @throws IOException if an error occurs during an input operation.
123:             */
124:            public static ReadableByteChannel openChannel(final String name)
125:                    throws IOException {
126:                return openChannel(TestData.class, name);
127:            }
128:
129:            /**
130:             * Copies the named resources from the {@code sample-data} module to the {@code test-data}
131:             * directory in an other module. For example if {@code TestData.copy(this, "foo.txt")} is
132:             * invoked inside a test suite in the {@code org.geotools.foo} package, then this method
133:             * copies {@code org/geotools/test-data/foo.txt} (from {@code sample-data} module) to
134:             * {@code org/geotools/foo/test-data/foo.txt} (in the {@code foo} module).
135:             * <p>
136:             * This method is useful when a test case needs to access a resource through a {@link File},
137:             * for example because it want to open it using {@link java.io.RandomAccess}. Because the
138:             * resources provided in the {@code sample-data} module are available to other modules as
139:             * a JAR file, other modules can only access them through an {@link URL} unless they copy
140:             * them in their own {@code test-data} directory.
141:             * <p>
142:             * If the named file already exists in the caller {@code test-data} directory, then this
143:             * method does nothing. It make it safe to invoke this method many time in a test suite,
144:             * since this method should not copy the file more than once for a given JVM execution.
145:             * <p>
146:             * The file will be {@linkplain File#deleteOnExit deleted on exit} if and only if it has
147:             * been modified. Callers don't need to worry about cleanup, because the files are copied
148:             * in the {@code target/.../test-data} directory, which is not versionned by SVN and is
149:             * cleaned by Maven on {@code mvn clean} execution.
150:             *
151:             * @param  caller Calling class or object used to locate the destination {@code test-data}.
152:             * @param  name Path to file in {@code org/geotools/test-data}.
153:             * @return The file to the <code>org/geotools/<strong>caller-package</strong>/test-data</code>
154:             *         resource copy, returned for convenience.
155:             * @throws FileNotFoundException if the file is not found.
156:             * @throws IOException if the resource can't be fetched for an other reason.
157:             */
158:            public static File copy(final Object caller, final String name)
159:                    throws IOException {
160:                final File path = new File(name);
161:                final File directory = new File(file(caller, null), path
162:                        .getParent());
163:                final File file = new File(directory, path.getName());
164:                if (!file.exists()) {
165:                    if (directory.mkdirs()) {
166:                        deleteOnExit(directory, false);
167:                    }
168:                    final InputStream in = openStream(name);
169:                    final OutputStream out = new FileOutputStream(file);
170:                    final byte[] buffer = new byte[4096];
171:                    deleteOnExit(file, false);
172:                    int count;
173:                    while ((count = in.read(buffer)) >= 0) {
174:                        out.write(buffer, 0, count);
175:                    }
176:                    out.close();
177:                    in.close();
178:                }
179:                return file;
180:            }
181:        }
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