Source Code Cross Referenced for FileUtil.java in  » Database-DBMS » hsql » org » hsqldb » lib » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.lib 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 2001-2005, The HSQL Development Group
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the HSQL Development Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package org.hsqldb.lib;
032:
033:        import java.io.File;
034:        import java.io.FileDescriptor;
035:        import java.io.FileInputStream;
036:        import java.io.FileOutputStream;
037:        import java.io.IOException;
038:        import java.util.Random;
039:
040:        import org.hsqldb.lib.java.JavaSystem;
041:
042:        /**
043:         * A collection of static file management methods.<p>
044:         * Also implements the default FileAccess method
045:         *
046:         * @author fredt@users
047:         * @author boucherb@users
048:         * @author Ocke Janssen oj@openoffice.org
049:         * @version 1.8.0
050:         * @since 1.7.2
051:         */
052:        public class FileUtil implements  FileAccess {
053:
054:            private static FileUtil fileUtil;
055:
056:            /** Creates a new instance of FileUtil */
057:            FileUtil() {
058:            }
059:
060:            public static FileUtil getDefaultInstance() {
061:
062:                if (fileUtil == null) {
063:                    fileUtil = new FileUtil();
064:                }
065:
066:                return fileUtil;
067:            }
068:
069:            public boolean isStreamElement(java.lang.String elementName) {
070:                return (new File(elementName)).exists();
071:            }
072:
073:            public java.io.InputStream openInputStreamElement(
074:                    java.lang.String streamName) throws java.io.IOException {
075:
076:                try {
077:                    return new FileInputStream(new File(streamName));
078:                } catch (Throwable e) {
079:                    throw toIOException(e);
080:                }
081:            }
082:
083:            public void createParentDirs(java.lang.String filename) {
084:                makeParentDirectories(new File(filename));
085:            }
086:
087:            public void removeElement(java.lang.String filename) {
088:
089:                if (isStreamElement(filename)) {
090:                    delete(filename);
091:                }
092:            }
093:
094:            public void renameElement(java.lang.String oldName,
095:                    java.lang.String newName) {
096:                renameOverwrite(oldName, newName);
097:            }
098:
099:            public java.io.OutputStream openOutputStreamElement(
100:                    java.lang.String streamName) throws java.io.IOException {
101:                return new FileOutputStream(new File(streamName));
102:            }
103:
104:            // end of FileAccess implementation
105:            // a new File("...")'s path is not canonicalized, only resolved
106:            // and normalized (e.g. redundant separator chars removed),
107:            // so as of JDK 1.4.2, this is a valid test for case insensitivity,
108:            // at least when it is assumed that we are dealing with a configuration
109:            // that only needs to consider the host platform's native file system,
110:            // even if, unlike for File.getCanonicalPath(), (new File("a")).exists() or
111:            // (new File("A")).exits(), regardless of the hosting system's
112:            // file path case sensitivity policy.
113:            public static final boolean fsIsIgnoreCase = (new File("A"))
114:                    .equals(new File("a"));
115:
116:            // posix separator normalized to File.separator?
117:            // CHECKME: is this true for every file system under Java?
118:            public static final boolean fsNormalizesPosixSeparator = (new File(
119:                    "/")).getPath().endsWith(File.separator);
120:
121:            // for JDK 1.1 createTempFile
122:            static final Random random = new Random(System.currentTimeMillis());
123:
124:            /**
125:             * Delete the named file
126:             */
127:            public static void delete(String filename) {
128:                (new File(filename)).delete();
129:            }
130:
131:            /**
132:             * Requests, in a JDK 1.1 compliant way, that the file or directory denoted
133:             * by the given abstract pathname be deleted when the virtual machine
134:             * terminates. <p>
135:             *
136:             * Deletion will be attempted only for JDK 1.2 and greater runtime
137:             * environments and only upon normal termination of the virtual
138:             * machine, as defined by the Java Language Specification. <p>
139:             *
140:             * Once deletion has been sucessfully requested, it is not possible to
141:             * cancel the request. This method should therefore be used with care. <p>
142:             *
143:             * @param f the abstract pathname of the file be deleted when the virtual
144:             *       machine terminates
145:             */
146:            public static void deleteOnExit(File f) {
147:                JavaSystem.deleteOnExit(f);
148:            }
149:
150:            /**
151:             * Return true or false based on whether the named file exists.
152:             */
153:            public static boolean exists(String filename) {
154:                return (new File(filename)).exists();
155:            }
156:
157:            public static boolean exists(String fileName, boolean resource,
158:                    Class cla) {
159:
160:                if (fileName == null || fileName.length() == 0) {
161:                    return false;
162:                }
163:
164:                return resource ? null != cla.getResource(fileName) : FileUtil
165:                        .exists(fileName);
166:            }
167:
168:            /**
169:             * Rename the file with oldname to newname. If a file with newname already
170:             * exists, it is deleted before the renaming operation proceeds.
171:             *
172:             * If a file with oldname does not exist, no file will exist after the
173:             * operation.
174:             */
175:            public static void renameOverwrite(String oldname, String newname) {
176:
177:                delete(newname);
178:
179:                if (exists(oldname)) {
180:                    File file = new File(oldname);
181:
182:                    file.renameTo(new File(newname));
183:                }
184:            }
185:
186:            public static IOException toIOException(Throwable e) {
187:
188:                if (e instanceof  IOException) {
189:                    return (IOException) e;
190:                } else {
191:                    return new IOException(e.toString());
192:                }
193:            }
194:
195:            /**
196:             * Retrieves the absolute path, given some path specification.
197:             *
198:             * @param path the path for which to retrieve the absolute path
199:             * @return the absolute path
200:             */
201:            public static String absolutePath(String path) {
202:                return (new File(path)).getAbsolutePath();
203:            }
204:
205:            /**
206:             * Retrieves the canonical file for the given file, in a
207:             * JDK 1.1 complaint way.
208:             *
209:             * @param f the File for which to retrieve the absolute File
210:             * @return the canonical File
211:             */
212:            public static File canonicalFile(File f) throws IOException {
213:                return new File(f.getCanonicalPath());
214:            }
215:
216:            /**
217:             * Retrieves the canonical file for the given path, in a
218:             * JDK 1.1 complaint way.
219:             *
220:             * @param path the path for which to retrieve the canonical File
221:             * @return the canonical File
222:             */
223:            public static File canonicalFile(String path) throws IOException {
224:                return new File(new File(path).getCanonicalPath());
225:            }
226:
227:            /**
228:             * Retrieves the canonical path for the given File, in a
229:             * JDK 1.1 complaint way.
230:             *
231:             * @param f the File for which to retrieve the canonical path
232:             * @return the canonical path
233:             */
234:            public static String canonicalPath(File f) throws IOException {
235:                return f.getCanonicalPath();
236:            }
237:
238:            /**
239:             * Retrieves the canonical path for the given path, in a
240:             * JDK 1.1 complaint way.
241:             *
242:             * @param path the path for which to retrieve the canonical path
243:             * @return the canonical path
244:             */
245:            public static String canonicalPath(String path) throws IOException {
246:                return new File(path).getCanonicalPath();
247:            }
248:
249:            /**
250:             * Retrieves the canonical path for the given path, or the absolute
251:             * path if attemting to retrieve the canonical path fails.
252:             *
253:             * @param path the path for which to retrieve the canonical or
254:             *      absolute path
255:             * @return the canonical or absolute path
256:             */
257:            public static String canonicalOrAbsolutePath(String path) {
258:
259:                try {
260:                    return canonicalPath(path);
261:                } catch (Exception e) {
262:                    return absolutePath(path);
263:                }
264:            }
265:
266:            public static void makeParentDirectories(File f) {
267:
268:                String parent = f.getParent();
269:
270:                if (parent != null) {
271:                    new File(parent).mkdirs();
272:                } else {
273:
274:                    // workaround for jdk 1.1 bug (returns null when there is a parent)
275:                    parent = f.getPath();
276:
277:                    int index = parent.lastIndexOf('/');
278:
279:                    if (index > 0) {
280:                        parent = parent.substring(0, index);
281:
282:                        new File(parent).mkdirs();
283:                    }
284:                }
285:            }
286:
287:            public class FileSync implements  FileAccess.FileSync {
288:
289:                FileDescriptor outDescriptor;
290:
291:                FileSync(FileOutputStream os) throws java.io.IOException {
292:                    outDescriptor = os.getFD();
293:                }
294:
295:                public void sync() throws java.io.IOException {
296:                    outDescriptor.sync();
297:                }
298:            }
299:
300:            public FileAccess.FileSync getFileSync(java.io.OutputStream os)
301:                    throws java.io.IOException {
302:                return new FileSync((FileOutputStream) os);
303:            }
304:        }
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