Source Code Cross Referenced for NSPrintWriter.java in  » Portal » Open-Portal » com » sun » portal » desktop » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » Open Portal » com.sun.portal.desktop.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * Copyright 2001 Sun Microsystems, Inc.  All rights reserved. 
003:         * PROPRIETARY/CONFIDENTIAL.  Use of this product is subject to license terms. 
004:         */
005:        package com.sun.portal.desktop.util;
006:
007:        import java.io.PrintWriter;
008:        import java.io.Writer;
009:        import java.io.OutputStream;
010:        import java.io.IOException;
011:        import java.io.BufferedWriter;
012:        import java.io.OutputStreamWriter;
013:        import java.io.InterruptedIOException;
014:
015:        /**
016:         * This class is taken from the JDK 1.2.2_11 reference 
017:         * implementation and modified to be unsynchronized, for
018:         * performance reasons. Objects based on this class 
019:         * must not be used
020:         * in a context where they are accessed by multiple
021:         * threads.
022:         */
023:
024:        public class NSPrintWriter extends PrintWriter {
025:
026:            /**
027:             * The underlying character-output stream of this
028:             * <code>PrintWriter</code>.
029:             *
030:             * @since 1.2
031:             */
032:            protected Writer out;
033:
034:            private boolean autoFlush = false;
035:            private boolean trouble = false;
036:
037:            /**
038:             * Line separator string.  This is the value of the line.separator
039:             * property at the moment that the stream was created.
040:             */
041:            private String lineSeparator;
042:
043:            /**
044:             * Create a new PrintWriter, without automatic line flushing.
045:             *
046:             * @param  out        A character-output stream
047:             */
048:            public NSPrintWriter(Writer out) {
049:                this (out, false);
050:            }
051:
052:            /**
053:             * Create a new PrintWriter.
054:             *
055:             * @param  out        A character-output stream
056:             * @param  autoFlush  A boolean; if true, the println() methods will flush
057:             *                    the output buffer
058:             */
059:            public NSPrintWriter(Writer out, boolean autoFlush) {
060:                super (out);
061:                this .out = out;
062:                this .autoFlush = autoFlush;
063:                lineSeparator = (String) java.security.AccessController
064:                        .doPrivileged(new sun.security.action.GetPropertyAction(
065:                                "line.separator"));
066:            }
067:
068:            /**
069:             * Create a new PrintWriter, without automatic line flushing, from an
070:             * existing OutputStream.  This convenience constructor creates the
071:             * necessary intermediate OutputStreamWriter, which will convert characters
072:             * into bytes using the default character encoding.
073:             *
074:             * @param  out        An output stream
075:             *
076:             * @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream)
077:             */
078:            public NSPrintWriter(OutputStream out) {
079:                this (out, false);
080:            }
081:
082:            /**
083:             * Create a new PrintWriter from an existing OutputStream.  This
084:             * convenience constructor creates the necessary intermediate
085:             * OutputStreamWriter, which will convert characters into bytes using the
086:             * default character encoding.
087:             *
088:             * @param  out        An output stream
089:             * @param  autoFlush  A boolean; if true, the println() methods will flush
090:             *                    the output buffer
091:             *
092:             * @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream)
093:             */
094:            public NSPrintWriter(OutputStream out, boolean autoFlush) {
095:                this (new BufferedWriter(new OutputStreamWriter(out)), autoFlush);
096:            }
097:
098:            /** Check to make sure that the stream has not been closed */
099:            private void ensureOpen() throws IOException {
100:                if (out == null)
101:                    throw new IOException("Stream closed");
102:            }
103:
104:            /** Flush the stream. */
105:            public void flush() {
106:                try {
107:                    ensureOpen();
108:                    out.flush();
109:                } catch (IOException x) {
110:                    trouble = true;
111:                }
112:            }
113:
114:            /** Close the stream. */
115:            public void close() {
116:                try {
117:                    if (out == null)
118:                        return;
119:                    out.close();
120:                    out = null;
121:                } catch (IOException x) {
122:                    trouble = true;
123:                }
124:            }
125:
126:            /**
127:             * Flush the stream and check its error state.  Errors are cumulative;
128:             * once the stream encounters an error, this routine will return true on
129:             * all successive calls.
130:             *
131:             * @return True if the print stream has encountered an error, either on the
132:             * underlying output stream or during a format conversion.
133:             */
134:            public boolean checkError() {
135:                if (out != null)
136:                    flush();
137:                return trouble;
138:            }
139:
140:            /** Indicate that an error has occurred. */
141:            protected void setError() {
142:                trouble = true;
143:            }
144:
145:            /*
146:             * Exception-catching, synchronized output operations,
147:             * which also implement the write() methods of Writer
148:             */
149:
150:            /** Write a single character. */
151:            public void write(int c) {
152:                try {
153:                    ensureOpen();
154:                    out.write(c);
155:                } catch (InterruptedIOException x) {
156:                    Thread.currentThread().interrupt();
157:                } catch (IOException x) {
158:                    trouble = true;
159:                }
160:            }
161:
162:            /** Write a portion of an array of characters. */
163:            public void write(char buf[], int off, int len) {
164:                try {
165:                    ensureOpen();
166:                    out.write(buf, off, len);
167:                } catch (InterruptedIOException x) {
168:                    Thread.currentThread().interrupt();
169:                } catch (IOException x) {
170:                    trouble = true;
171:                }
172:            }
173:
174:            /**
175:             * Write an array of characters.  This method cannot be inherited from the
176:             * Writer class because it must suppress I/O exceptions.
177:             */
178:            public void write(char buf[]) {
179:                write(buf, 0, buf.length);
180:            }
181:
182:            /** Write a portion of a string. */
183:            public void write(String s, int off, int len) {
184:                try {
185:                    ensureOpen();
186:                    out.write(s, off, len);
187:                } catch (InterruptedIOException x) {
188:                    Thread.currentThread().interrupt();
189:                } catch (IOException x) {
190:                    trouble = true;
191:                }
192:            }
193:
194:            /**
195:             * Write a string.  This method cannot be inherited from the Writer class
196:             * because it must suppress I/O exceptions.
197:             */
198:            public void write(String s) {
199:                write(s, 0, s.length());
200:            }
201:
202:            private void newLine() {
203:                try {
204:                    ensureOpen();
205:                    out.write(lineSeparator);
206:                    if (autoFlush)
207:                        out.flush();
208:                } catch (InterruptedIOException x) {
209:                    Thread.currentThread().interrupt();
210:                } catch (IOException x) {
211:                    trouble = true;
212:                }
213:            }
214:
215:            /* Methods that do not terminate lines */
216:
217:            /**
218:             * Print a boolean value.  The string produced by <code>{@link
219:             * java.lang.String#valueOf(boolean)}</code> is translated into bytes
220:             * according to the platform's default character encoding, and these bytes
221:             * are written in exactly the manner of the <code>{@link
222:             * #write(int)}</code> method.
223:             *
224:             * @param      b   The <code>boolean</code> to be printed
225:             */
226:            public void print(boolean b) {
227:                write(b ? "true" : "false");
228:            }
229:
230:            /**
231:             * Print a character.  The character is translated into one or more bytes
232:             * according to the platform's default character encoding, and these bytes
233:             * are written in exactly the manner of the <code>{@link
234:             * #write(int)}</code> method.
235:             *
236:             * @param      c   The <code>char</code> to be printed
237:             */
238:            public void print(char c) {
239:                write(String.valueOf(c));
240:            }
241:
242:            /**
243:             * Print an integer.  The string produced by <code>{@link
244:             * java.lang.String#valueOf(int)}</code> is translated into bytes according
245:             * to the platform's default character encoding, and these bytes are
246:             * written in exactly the manner of the <code>{@link #write(int)}</code>
247:             * method.
248:             *
249:             * @param      i   The <code>int</code> to be printed
250:             * @see        java.lang.Integer#toString(int)
251:             */
252:            public void print(int i) {
253:                write(String.valueOf(i));
254:            }
255:
256:            /**
257:             * Print a long integer.  The string produced by <code>{@link
258:             * java.lang.String#valueOf(long)}</code> is translated into bytes
259:             * according to the platform's default character encoding, and these bytes
260:             * are written in exactly the manner of the <code>{@link #write(int)}</code>
261:             * method.
262:             *
263:             * @param      l   The <code>long</code> to be printed
264:             * @see        java.lang.Long#toString(long)
265:             */
266:            public void print(long l) {
267:                write(String.valueOf(l));
268:            }
269:
270:            /**
271:             * Print a floating-point number.  The string produced by <code>{@link
272:             * java.lang.String#valueOf(float)}</code> is translated into bytes
273:             * according to the platform's default character encoding, and these bytes
274:             * are written in exactly the manner of the <code>{@link #write(int)}</code>
275:             * method.
276:             *
277:             * @param      f   The <code>float</code> to be printed
278:             * @see        java.lang.Float#toString(float)
279:             */
280:            public void print(float f) {
281:                write(String.valueOf(f));
282:            }
283:
284:            /**
285:             * Print a double-precision floating-point number.  The string produced by
286:             * <code>{@link java.lang.String#valueOf(double)}</code> is translated into
287:             * bytes according to the platform's default character encoding, and these
288:             * bytes are written in exactly the manner of the <code>{@link
289:             * #write(int)}</code> method.
290:             *
291:             * @param      d   The <code>double</code> to be printed
292:             * @see        java.lang.Double#toString(double)
293:             */
294:            public void print(double d) {
295:                write(String.valueOf(d));
296:            }
297:
298:            /**
299:             * Print an array of characters.  The characters are converted into bytes
300:             * according to the platform's default character encoding, and these bytes
301:             * are written in exactly the manner of the <code>{@link #write(int)}</code>
302:             * method.
303:             *
304:             * @param      s   The array of chars to be printed
305:             *
306:             * @throws  NullPointerException  If <code>s</code> is <code>null</code>
307:             */
308:            public void print(char s[]) {
309:                write(s);
310:            }
311:
312:            /**
313:             * Print a string.  If the argument is <code>null</code> then the string
314:             * <code>"null"</code> is printed.  Otherwise, the string's characters are
315:             * converted into bytes according to the platform's default character
316:             * encoding, and these bytes are written in exactly the manner of the
317:             * <code>{@link #write(int)}</code> method.
318:             *
319:             * @param      s   The <code>String</code> to be printed
320:             */
321:            public void print(String s) {
322:                if (s == null) {
323:                    s = "null";
324:                }
325:                write(s);
326:            }
327:
328:            /**
329:             * Print an object.  The string produced by the <code>{@link
330:             * java.lang.String#valueOf(Object)}</code> method is translated into bytes
331:             * according to the platform's default character encoding, and these bytes
332:             * are written in exactly the manner of the <code>{@link #write(int)}</code>
333:             * method.
334:             *
335:             * @param      obj   The <code>Object</code> to be printed
336:             * @see        java.lang.Object#toString()
337:             */
338:            public void print(Object obj) {
339:                write(String.valueOf(obj));
340:            }
341:
342:            /* Methods that do terminate lines */
343:
344:            /**
345:             * Terminate the current line by writing the line separator string.  The
346:             * line separator string is defined by the system property
347:             * <code>line.separator</code>, and is not necessarily a single newline
348:             * character (<code>'\n'</code>).
349:             */
350:            public void println() {
351:                newLine();
352:            }
353:
354:            /**
355:             * Print a boolean value and then terminate the line.  This method behaves
356:             * as though it invokes <code>{@link #print(boolean)}</code> and then
357:             * <code>{@link #println()}</code>.
358:             *
359:             * @param x the <code>boolean</code> value to be printed
360:             */
361:            public void println(boolean x) {
362:                print(x);
363:                println();
364:            }
365:
366:            /**
367:             * Print a character and then terminate the line.  This method behaves as
368:             * though it invokes <code>{@link #print(char)}</code> and then <code>{@link
369:             * #println()}</code>.
370:             *
371:             * @param x the <code>char</code> value to be printed
372:             */
373:            public void println(char x) {
374:                print(x);
375:                println();
376:            }
377:
378:            /**
379:             * Print an integer and then terminate the line.  This method behaves as
380:             * though it invokes <code>{@link #print(int)}</code> and then <code>{@link
381:             * #println()}</code>.
382:             *
383:             * @param x the <code>int</code> value to be printed
384:             */
385:            public void println(int x) {
386:                print(x);
387:                println();
388:            }
389:
390:            /**
391:             * Print a long integer and then terminate the line.  This method behaves
392:             * as though it invokes <code>{@link #print(long)}</code> and then
393:             * <code>{@link #println()}</code>.
394:             *
395:             * @param x the <code>long</code> value to be printed
396:             */
397:            public void println(long x) {
398:                print(x);
399:                println();
400:            }
401:
402:            /**
403:             * Print a floating-point number and then terminate the line.  This method
404:             * behaves as though it invokes <code>{@link #print(float)}</code> and then
405:             * <code>{@link #println()}</code>.
406:             *
407:             * @param x the <code>float</code> value to be printed
408:             */
409:            public void println(float x) {
410:                print(x);
411:                println();
412:            }
413:
414:            /**
415:             * Print a double-precision floating-point number and then terminate the
416:             * line.  This method behaves as though it invokes <code>{@link
417:             * #print(double)}</code> and then <code>{@link #println()}</code>.
418:             *
419:             * @param x the <code>double</code> value to be printed
420:             */
421:            public void println(double x) {
422:                print(x);
423:                println();
424:            }
425:
426:            /**
427:             * Print an array of characters and then terminate the line.  This method
428:             * behaves as though it invokes <code>{@link #print(char[])}</code> and then
429:             * <code>{@link #println()}</code>.
430:             *
431:             * @param x the array of <code>char</code> values to be printed
432:             */
433:            public void println(char x[]) {
434:                print(x);
435:                println();
436:            }
437:
438:            /**
439:             * Print a String and then terminate the line.  This method behaves as
440:             * though it invokes <code>{@link #print(String)}</code> and then
441:             * <code>{@link #println()}</code>.
442:             *
443:             * @param x the <code>String</code> value to be printed
444:             */
445:            public void println(String x) {
446:                print(x);
447:                println();
448:            }
449:
450:            /**
451:             * Print an Object and then terminate the line.  This method behaves as
452:             * though it invokes <code>{@link #print(Object)}</code> and then
453:             * <code>{@link #println()}</code>.
454:             *
455:             * @param x the <code>Object</code> value to be printed
456:             */
457:            public void println(Object x) {
458:                print(x);
459:                println();
460:            }
461:
462:        }
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