Source Code Cross Referenced for FileUtil.java in  » Wiki-Engine » JSPWiki » com » ecyrd » jspwiki » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Wiki Engine » JSPWiki » com.ecyrd.jspwiki 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:            JSPWiki - a JSP-based WikiWiki clone.
003:
004:            Copyright (C) 2001 Janne Jalkanen (Janne.Jalkanen@iki.fi)
005:
006:            This program is free software; you can redistribute it and/or modify
007:            it under the terms of the GNU Lesser General Public License as published by
008:            the Free Software Foundation; either version 2.1 of the License, or
009:            (at your option) any later version.
010:
011:            This program 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
014:            GNU Lesser General Public License for more details.
015:
016:            You should have received a copy of the GNU Lesser General Public License
017:            along with this program; if not, write to the Free Software
018:            Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
019:         */
020:
021:        package com.ecyrd.jspwiki;
022:
023:        import java.io.*;
024:        import java.nio.ByteBuffer;
025:        import java.nio.CharBuffer;
026:        import java.nio.charset.CharacterCodingException;
027:        import java.nio.charset.Charset;
028:        import java.nio.charset.CharsetDecoder;
029:        import java.nio.charset.CodingErrorAction;
030:
031:        import org.apache.log4j.Logger;
032:
033:        /**
034:         *  Generic utilities related to file and stream handling.
035:         */
036:        // FIXME3.0: This class will move to "util" directory in 3.0
037:        public final class FileUtil {
038:            /** Size of the buffer used when copying large chunks of data. */
039:            private static final int BUFFER_SIZE = 4096;
040:            private static final Logger log = Logger.getLogger(FileUtil.class);
041:
042:            /**
043:             *  Private constructor prevents instantiation.
044:             */
045:            private FileUtil() {
046:            }
047:
048:            /**
049:             *  Makes a new temporary file and writes content into it. The temporary
050:             *  file is created using <code>File.createTempFile()</code>, and the usual
051:             *  semantics apply.  The files are not deleted automatically in exit.
052:             *
053:             *  @param content Initial content of the temporary file.
054:             *  @param encoding Encoding to use.
055:             *  @return The handle to the new temporary file
056:             *  @throws IOException If the content creation failed.
057:             *  @see java.io.File#createTempFile(String,String,File)
058:             */
059:            public static File newTmpFile(String content, String encoding)
060:                    throws IOException {
061:                Writer out = null;
062:                Reader in = null;
063:                File f = null;
064:
065:                try {
066:                    f = File.createTempFile("jspwiki", null);
067:
068:                    in = new StringReader(content);
069:
070:                    out = new OutputStreamWriter(new FileOutputStream(f),
071:                            encoding);
072:
073:                    copyContents(in, out);
074:                } finally {
075:                    if (in != null)
076:                        in.close();
077:                    if (out != null)
078:                        out.close();
079:                }
080:
081:                return f;
082:            }
083:
084:            /**
085:             *  Creates a new temporary file using the default encoding
086:             *  of ISO-8859-1 (Latin1).
087:             *
088:             *  @param content The content to put into the file.
089:             *  @throws IOException If writing was unsuccessful.
090:             *  @return A handle to the newly created file.
091:             *  @see #newTmpFile( String, String )
092:             *  @see java.io.File#createTempFile(String,String,File)
093:             */
094:            public static File newTmpFile(String content) throws IOException {
095:                return newTmpFile(content, "ISO-8859-1");
096:            }
097:
098:            /**
099:             *  Runs a simple command in given directory.
100:             *  The environment is inherited from the parent process (e.g. the
101:             *  one in which this Java VM runs).
102:             *
103:             *  @return Standard output from the command.
104:             *  @param  command The command to run
105:             *  @param  directory The working directory to run the command in
106:             *  @throws IOException If the command failed
107:             *  @throws InterruptedException If the command was halted
108:             */
109:            public static String runSimpleCommand(String command,
110:                    String directory) throws IOException, InterruptedException {
111:                StringBuffer result = new StringBuffer();
112:
113:                log.info("Running simple command " + command + " in "
114:                        + directory);
115:
116:                Process process = Runtime.getRuntime().exec(command, null,
117:                        new File(directory));
118:
119:                BufferedReader stdout = null;
120:                BufferedReader stderr = null;
121:
122:                try {
123:                    stdout = new BufferedReader(new InputStreamReader(process
124:                            .getInputStream()));
125:                    stderr = new BufferedReader(new InputStreamReader(process
126:                            .getErrorStream()));
127:
128:                    String line;
129:
130:                    while ((line = stdout.readLine()) != null) {
131:                        result.append(line + "\n");
132:                    }
133:
134:                    StringBuffer error = new StringBuffer();
135:                    while ((line = stderr.readLine()) != null) {
136:                        error.append(line + "\n");
137:                    }
138:
139:                    if (error.length() > 0) {
140:                        log.error("Command failed, error stream is: " + error);
141:                    }
142:
143:                    process.waitFor();
144:
145:                } finally {
146:                    // we must close all by exec(..) opened streams: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4784692
147:                    process.getInputStream().close();
148:                    if (stdout != null)
149:                        stdout.close();
150:                    if (stderr != null)
151:                        stderr.close();
152:                }
153:
154:                return result.toString();
155:            }
156:
157:            /**
158:             *  Just copies all characters from <I>in</I> to <I>out</I>.  The copying
159:             *  is performed using a buffer of bytes.
160:             *
161:             *  @since 1.5.8
162:             *  @param in The reader to copy from
163:             *  @param out The reader to copy to
164:             *  @throws IOException If reading or writing failed.
165:             */
166:            public static void copyContents(Reader in, Writer out)
167:                    throws IOException {
168:                char[] buf = new char[BUFFER_SIZE];
169:                int bytesRead = 0;
170:
171:                while ((bytesRead = in.read(buf)) > 0) {
172:                    out.write(buf, 0, bytesRead);
173:                }
174:
175:                out.flush();
176:            }
177:
178:            /**
179:             *  Just copies all bytes from <I>in</I> to <I>out</I>.  The copying is
180:             *  performed using a buffer of bytes.
181:             *
182:             *  @since 1.9.31
183:             *  @param in The inputstream to copy from
184:             *  @param out The outputstream to copy to
185:             *  @throws IOException In case reading or writing fails.
186:             */
187:            public static void copyContents(InputStream in, OutputStream out)
188:                    throws IOException {
189:                byte[] buf = new byte[BUFFER_SIZE];
190:                int bytesRead = 0;
191:
192:                while ((bytesRead = in.read(buf)) > 0) {
193:                    out.write(buf, 0, bytesRead);
194:                }
195:
196:                out.flush();
197:            }
198:
199:            /**
200:             *  Reads in file contents.
201:             *  <P>
202:             *  This method is smart and falls back to ISO-8859-1 if the input stream does not
203:             *  seem to be in the specified encoding.
204:             *
205:             *  @param input The InputStream to read from.
206:             *  @param encoding The encoding to assume at first.
207:             *  @return A String, interpreted in the "encoding", or, if it fails, in Latin1.
208:             *  @throws IOException If the stream cannot be read or the stream cannot be
209:             *          decoded (even) in Latin1
210:             */
211:            public static String readContents(InputStream input, String encoding)
212:                    throws IOException {
213:                ByteArrayOutputStream out = new ByteArrayOutputStream();
214:                FileUtil.copyContents(input, out);
215:
216:                ByteBuffer bbuf = ByteBuffer.wrap(out.toByteArray());
217:
218:                Charset cset = Charset.forName(encoding);
219:                CharsetDecoder csetdecoder = cset.newDecoder();
220:
221:                csetdecoder.onMalformedInput(CodingErrorAction.REPORT);
222:                csetdecoder.onUnmappableCharacter(CodingErrorAction.REPORT);
223:
224:                try {
225:                    CharBuffer cbuf = csetdecoder.decode(bbuf);
226:
227:                    return cbuf.toString();
228:                } catch (CharacterCodingException e) {
229:                    Charset latin1 = Charset.forName("ISO-8859-1");
230:                    CharsetDecoder l1decoder = latin1.newDecoder();
231:
232:                    l1decoder.onMalformedInput(CodingErrorAction.REPORT);
233:                    l1decoder.onUnmappableCharacter(CodingErrorAction.REPORT);
234:
235:                    try {
236:                        bbuf = ByteBuffer.wrap(out.toByteArray());
237:
238:                        CharBuffer cbuf = l1decoder.decode(bbuf);
239:
240:                        return cbuf.toString();
241:                    } catch (CharacterCodingException ex) {
242:                        throw (CharacterCodingException) ex.fillInStackTrace();
243:                    }
244:                }
245:            }
246:
247:            /**
248:             *  Returns the full contents of the Reader as a String.
249:             *
250:             *  @since 1.5.8
251:             *  @param in The reader from which the contents shall be read.
252:             *  @return String read from the Reader
253:             *  @throws IOException If reading fails.
254:             */
255:            public static String readContents(Reader in) throws IOException {
256:                Writer out = null;
257:
258:                try {
259:                    out = new StringWriter();
260:
261:                    copyContents(in, out);
262:
263:                    return out.toString();
264:                } finally {
265:                    try {
266:                        out.close();
267:                    } catch (Exception e) {
268:                        log
269:                                .error("Not able to close the stream while reading contents.");
270:                    }
271:                }
272:            }
273:
274:            /**
275:             *  Returns the class and method name (+a line number) in which the
276:             *  Throwable was thrown.
277:             *
278:             *  @param t A Throwable to analyze.
279:             *  @return A human-readable string stating the class and method.  Do not rely
280:             *          the format to be anything fixed.
281:             */
282:            public static String getThrowingMethod(Throwable t) {
283:                StackTraceElement[] trace = t.getStackTrace();
284:                StringBuffer sb = new StringBuffer();
285:
286:                if (trace == null || trace.length == 0) {
287:                    sb.append("[Stack trace not available]");
288:                } else {
289:                    sb.append(trace[0].isNativeMethod() ? "native method" : "");
290:                    sb.append(trace[0].getClassName());
291:                    sb.append(".");
292:                    sb.append(trace[0].getMethodName() + "(), line "
293:                            + trace[0].getLineNumber());
294:                }
295:                return sb.toString();
296:            }
297:        }
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