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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/io/StringWriter.java
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+/* StringWriter.java -- Writes bytes to a StringBuffer
+ Copyright (C) 1998, 1999, 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.io;
+
+// Wow is this a dumb class. CharArrayWriter can do all this and
+// more. I would redirect all calls to one in fact, but the javadocs say
+// use a StringBuffer so I will comply.
+
+/**
+ * This class writes chars to an internal <code>StringBuffer</code> that
+ * can then be used to retrieve a <code>String</code>.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @author Tom Tromey (tromey@cygnus.com)
+ */
+public class StringWriter extends Writer
+{
+ /**
+ * This is the default size of the buffer if the user doesn't specify it.
+ * @specnote The JCL Volume 1 says that 16 is the default size.
+ */
+ private static final int DEFAULT_BUFFER_SIZE = 16;
+
+ /**
+ * This method closes the stream. The contents of the internal buffer
+ * can still be retrieved, but future writes are not guaranteed to work.
+ *
+ * @exception IOException If an error orrurs.
+ */
+ public void close () throws IOException
+ {
+ // JCL says this does nothing. This seems to violate the Writer
+ // contract, in that other methods should still throw an
+ // IOException after a close. Still, we just follow JCL.
+ }
+
+ /**
+ * This method flushes any buffered characters to the underlying output.
+ * It does nothing in this class.
+ */
+ public void flush ()
+ {
+ }
+
+ /**
+ * This method returns the <code>StringBuffer</code> object that this
+ * object is writing to. Note that this is the actual internal buffer, so
+ * any operations performed on it will affect this stream object.
+ *
+ * @return The <code>StringBuffer</code> object being written to
+ */
+ public StringBuffer getBuffer ()
+ {
+ return buffer;
+ }
+
+ /**
+ * This method initializes a new <code>StringWriter</code> to write to a
+ * <code>StringBuffer</code> initially sized to a default size of 16
+ * chars.
+ */
+ public StringWriter ()
+ {
+ this (DEFAULT_BUFFER_SIZE);
+ }
+
+ /**
+ * This method initializes a new <code>StringWriter</code> to write to a
+ * <code>StringBuffer</code> with the specified initial size.
+ *
+ * @param size The initial size to make the <code>StringBuffer</code>
+ */
+ public StringWriter (int size)
+ {
+ super ();
+ buffer = new StringBuffer (size);
+ lock = buffer;
+ }
+
+ /**
+ * This method returns the contents of the internal <code>StringBuffer</code>
+ * as a <code>String</code>.
+ *
+ * @return A <code>String</code> representing the chars written to
+ * this stream.
+ */
+ public String toString ()
+ {
+ return buffer.toString();
+ }
+
+ /**
+ * This method writes a single character to the output, storing it in
+ * the internal buffer.
+ *
+ * @param oneChar The <code>char</code> to write, passed as an int.
+ */
+ public void write (int oneChar)
+ {
+ buffer.append((char) (oneChar & 0xFFFF));
+ }
+
+ /**
+ * This method writes <code>len</code> chars from the specified
+ * array starting at index <code>offset</code> in that array to this
+ * stream by appending the chars to the end of the internal buffer.
+ *
+ * @param chars The array of chars to write
+ * @param offset The index into the array to start writing from
+ * @param len The number of chars to write
+ */
+ public void write (char[] chars, int offset, int len)
+ {
+ buffer.append(chars, offset, len);
+ }
+
+ /**
+ * This method writes the characters in the specified <code>String</code>
+ * to the stream by appending them to the end of the internal buffer.
+ *
+ * @param str The <code>String</code> to write to the stream.
+ */
+ public void write (String str)
+ {
+ buffer.append(str);
+ }
+
+ /**
+ * This method writes out <code>len</code> characters of the specified
+ * <code>String</code> to the stream starting at character position
+ * <code>offset</code> into the stream. This is done by appending the
+ * characters to the internal buffer.
+ *
+ * @param str The <code>String</code> to write characters from
+ * @param offset The character position to start writing from
+ * @param len The number of characters to write.
+ */
+ public void write (String str, int offset, int len)
+ {
+// char[] tmpbuf = new char[len];
+// str.getChars(offset, offset+len, tmpbuf, 0);
+// buf.append(tmpbuf, 0, tmpbuf.length);
+ // This implementation assumes that String.substring is more
+ // efficient than using String.getChars and copying the data
+ // twice. For libgcj, this is true. For Classpath, it is not.
+ // FIXME.
+ buffer.append(str.substring(offset, offset + len));
+ }
+
+ /** @since 1.5 */
+ public StringWriter append(char c)
+ {
+ write(c);
+ return this;
+ }
+
+ /** @since 1.5 */
+ public StringWriter append(CharSequence cs)
+ {
+ write(cs == null ? "null" : cs.toString());
+ return this;
+ }
+
+ /** @since 1.5 */
+ public StringWriter append(CharSequence cs, int start, int end)
+ {
+ write(cs == null ? "null" : cs.subSequence(start, end).toString());
+ return this;
+ }
+
+ /**
+ * This is the <code>StringBuffer</code> that we use to store bytes that
+ * are written.
+ */
+ private StringBuffer buffer;
+}