Initial revision

From-SVN: r26263

libjava/java/io/CharArrayWriter.java

@@ -0,0 +1,122 @@
+// CharArrayWriter.java - Character array 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 1.1.
+ */
+
+public class CharArrayWriter extends Writer
+{
+  public CharArrayWriter ()
+  {
+    this (32);
+  }
+
+  public CharArrayWriter (int size)
+  {
+    super ();
+    buf = new char[size];
+  }
+
+  public void close ()
+  {
+    // JCL says this does nothing.  This seems to violate the Writer
+    // contract, in that other methods should still throw and
+    // IOException after a close.  Still, we just follow JCL.
+  }
+
+  public void flush ()
+  {
+  }
+
+  public synchronized void reset ()
+  {
+    count = 0;
+  }
+
+  public int size ()
+  {
+    return count;
+  }
+
+  public char[] toCharArray ()
+  {
+    char[] nc = new char[count];
+    System.arraycopy(buf, 0, nc, 0, count);
+    return nc;
+  }
+
+  public String toString ()
+  {
+    return new String (buf, 0, count);
+  }
+
+  public void write (int oneChar)
+  {
+    synchronized (lock)
+      {
+	resize (1);
+	buf[count++] = (char) oneChar;
+      }
+  }
+
+  public void write (char[] buffer, int offset, int len)
+  {
+    synchronized (lock)
+      {
+	if (len >= 0)
+	  resize (len);
+	System.arraycopy(buffer, offset, buf, count, len);
+	count += len;
+      }
+  }
+
+  public void write (String str, int offset, int len)
+  {
+    synchronized (lock)
+      {
+	if (len >= 0)
+	  resize (len);
+	str.getChars(offset, offset + len, buf, count);
+	count += len;
+      }
+  }
+
+  public void writeTo (Writer out) throws IOException
+  {
+    out.write(buf, 0, count);
+  }
+
+  private final void resize (int len)
+  {
+    if (count + len >= buf.length)
+      {
+	int newlen = buf.length * 2;
+	if (count + len > newlen)
+	  newlen = count + len;
+	char[] newbuf = new char[newlen];
+	System.arraycopy(buf, 0, newbuf, 0, count);
+	buf = newbuf;
+      }
+  }
+
+  // The character buffer.
+  protected char[] buf;
+  // Number of valid characters in buffer.
+  protected int count;
+}