/hudson-core/src/main/java/hudson/util/io/ReopenableFileOutputStream.java
http://github.com/hudson/hudson · Java · 99 lines · 52 code · 12 blank · 35 comment · 2 complexity · a1e67d028282bae79f5effd129f28400 MD5 · raw file
- /*
- * The MIT License
- *
- * Copyright (c) 2010, CloudBees, Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
- package hudson.util.io;
- import hudson.util.IOException2;
- import java.io.File;
- import java.io.FileNotFoundException;
- import java.io.FileOutputStream;
- import java.io.IOException;
- import java.io.OutputStream;
- /**
- * {@link OutputStream} that writes to a file.
- *
- * <p>
- * Unlike regular {@link FileOutputStream}, this implementation allows the caller to close,
- * and then keep writing.
- *
- * @author Kohsuke Kawaguchi
- */
- public class ReopenableFileOutputStream extends OutputStream {
- private final File out;
- private OutputStream current;
- private boolean appendOnNextOpen = false;
- public ReopenableFileOutputStream(File out) {
- this.out = out;
- }
- private synchronized OutputStream current() throws IOException {
- if (current==null)
- try {
- current = new FileOutputStream(out,appendOnNextOpen);
- } catch (FileNotFoundException e) {
- throw new IOException2("Failed to open "+out,e);
- }
- return current;
- }
- @Override
- public void write(int b) throws IOException {
- current().write(b);
- }
- @Override
- public void write(byte[] b) throws IOException {
- current().write(b);
- }
- @Override
- public void write(byte[] b, int off, int len) throws IOException {
- current().write(b, off, len);
- }
- @Override
- public void flush() throws IOException {
- current().flush();
- }
- @Override
- public synchronized void close() throws IOException {
- if (current!=null) {
- current.close();
- appendOnNextOpen = true;
- current = null;
- }
- }
- /**
- * In addition to close, ensure that the next "open" would truncate the file.
- */
- public synchronized void rewind() throws IOException {
- close();
- appendOnNextOpen = false;
- }
- }