Initial revision

From-SVN: r26263

libjava/java/io/BufferedWriter.java

@@ -0,0 +1,129 @@
+// BufferedWriter.java - Filtered character output stream.
+
+/* Copyright (C) 1998, 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package java.io;
+
+/**
+ * @author Tom Tromey <tromey@cygnus.com>
+ * @date September 25, 1998 
+ */
+
+/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
+ * "The Java Language Specification", ISBN 0-201-63451-1
+ * Status:  Complete to version 1.1.
+ */
+
+// Why not extend FilterWriter?
+public class BufferedWriter extends Writer
+{
+  public BufferedWriter (Writer out)
+  {
+    this (out, 8192);
+  }
+
+  public BufferedWriter (Writer ox, int size)
+  {
+    super (ox);
+    out = ox;
+    buffer = new char[size];
+    count = 0;
+  }
+
+  public void close () throws IOException
+  {
+    localFlush ();
+    out.close();
+  }
+
+  public void flush () throws IOException
+  {
+    localFlush ();
+    out.flush();
+  }
+
+  public void newLine () throws IOException
+  {
+    write (System.getProperty("line.separator"));
+  }
+
+  public void write (int oneChar) throws IOException
+  {
+    synchronized (lock)
+      {
+	buffer[count++] = (char) oneChar;
+	if (count == buffer.length)
+	  localFlush ();
+      }
+  }
+
+  public void write (char[] buf, int offset, int len) throws IOException
+  {
+    if (offset < 0 || len < 0 || offset + len > buf.length)
+      throw new ArrayIndexOutOfBoundsException ();
+
+    synchronized (lock)
+      {
+	// Bypass buffering if there is too much incoming data.
+	if (count + len > buffer.length)
+	  {
+	    localFlush ();
+	    out.write(buf, offset, len);
+	  }
+	else
+	  {
+	    System.arraycopy(buf, offset, buffer, count, len);
+	    count += len;
+	    if (count == buffer.length)
+	      localFlush ();
+	  }
+      }
+  }
+
+  public void write (String str, int offset, int len) throws IOException
+  {
+    if (offset < 0 || len < 0 || offset + len < str.length())
+      throw new ArrayIndexOutOfBoundsException ();
+
+    synchronized (lock)
+      {
+	if (count + len > buffer.length)
+	  {
+	    localFlush ();
+	    out.write(str, offset, len);
+	  }
+	else
+	  {
+	    str.getChars(offset, offset + len, buffer, count);
+	    count += len;
+	    if (count == buffer.length)
+	      localFlush ();
+	  }
+      }
+  }
+
+  private final void localFlush () throws IOException
+  {
+    if (count > 0)
+      {
+	synchronized (lock)
+	  {
+	    out.write(buffer, 0, count);
+	    count = 0;
+	  }
+      }
+  }
+
+  // The downstream writer.
+  private Writer out;
+  // The character buffer.
+  char[] buffer;
+  // Number of valid chars in buffer.
+  int count;
+}