| /* |
| * Copyright (c) 1996, 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package java.io; |
| |
| import java.util.Arrays; |
| |
| /** |
| * This class implements a character buffer that can be used as an Writer. |
| * The buffer automatically grows when data is written to the stream. The data |
| * can be retrieved using toCharArray() and toString(). |
| * <P> |
| * Note: Invoking close() on this class has no effect, and methods |
| * of this class can be called after the stream has closed |
| * without generating an IOException. |
| * |
| * @author Herb Jellinek |
| * @since JDK1.1 |
| */ |
| public |
| class CharArrayWriter extends Writer { |
| /** |
| * The buffer where data is stored. |
| */ |
| protected char buf[]; |
| |
| /** |
| * The number of chars in the buffer. |
| */ |
| protected int count; |
| |
| /** |
| * Creates a new CharArrayWriter. |
| */ |
| public CharArrayWriter() { |
| this(32); |
| } |
| |
| /** |
| * Creates a new CharArrayWriter with the specified initial size. |
| * |
| * @param initialSize an int specifying the initial buffer size. |
| * @exception IllegalArgumentException if initialSize is negative |
| */ |
| public CharArrayWriter(int initialSize) { |
| if (initialSize < 0) { |
| throw new IllegalArgumentException("Negative initial size: " |
| + initialSize); |
| } |
| buf = new char[initialSize]; |
| } |
| |
| /** |
| * Writes a character to the buffer. |
| */ |
| public void write(int c) { |
| synchronized (lock) { |
| int newcount = count + 1; |
| if (newcount > buf.length) { |
| buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount)); |
| } |
| buf[count] = (char)c; |
| count = newcount; |
| } |
| } |
| |
| /** |
| * Writes characters to the buffer. |
| * @param c the data to be written |
| * @param off the start offset in the data |
| * @param len the number of chars that are written |
| */ |
| public void write(char c[], int off, int len) { |
| if ((off < 0) || (off > c.length) || (len < 0) || |
| ((off + len) > c.length) || ((off + len) < 0)) { |
| throw new IndexOutOfBoundsException(); |
| } else if (len == 0) { |
| return; |
| } |
| synchronized (lock) { |
| int newcount = count + len; |
| if (newcount > buf.length) { |
| buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount)); |
| } |
| System.arraycopy(c, off, buf, count, len); |
| count = newcount; |
| } |
| } |
| |
| /** |
| * Write a portion of a string to the buffer. |
| * @param str String to be written from |
| * @param off Offset from which to start reading characters |
| * @param len Number of characters to be written |
| */ |
| public void write(String str, int off, int len) { |
| synchronized (lock) { |
| int newcount = count + len; |
| if (newcount > buf.length) { |
| buf = Arrays.copyOf(buf, Math.max(buf.length << 1, newcount)); |
| } |
| str.getChars(off, off + len, buf, count); |
| count = newcount; |
| } |
| } |
| |
| /** |
| * Writes the contents of the buffer to another character stream. |
| * |
| * @param out the output stream to write to |
| * @throws IOException If an I/O error occurs. |
| */ |
| public void writeTo(Writer out) throws IOException { |
| synchronized (lock) { |
| out.write(buf, 0, count); |
| } |
| } |
| |
| /** |
| * Appends the specified character sequence to this writer. |
| * |
| * <p> An invocation of this method of the form <tt>out.append(csq)</tt> |
| * behaves in exactly the same way as the invocation |
| * |
| * <pre> |
| * out.write(csq.toString()) </pre> |
| * |
| * <p> Depending on the specification of <tt>toString</tt> for the |
| * character sequence <tt>csq</tt>, the entire sequence may not be |
| * appended. For instance, invoking the <tt>toString</tt> method of a |
| * character buffer will return a subsequence whose content depends upon |
| * the buffer's position and limit. |
| * |
| * @param csq |
| * The character sequence to append. If <tt>csq</tt> is |
| * <tt>null</tt>, then the four characters <tt>"null"</tt> are |
| * appended to this writer. |
| * |
| * @return This writer |
| * |
| * @since 1.5 |
| */ |
| public CharArrayWriter append(CharSequence csq) { |
| String s = (csq == null ? "null" : csq.toString()); |
| write(s, 0, s.length()); |
| return this; |
| } |
| |
| /** |
| * Appends a subsequence of the specified character sequence to this writer. |
| * |
| * <p> An invocation of this method of the form <tt>out.append(csq, start, |
| * end)</tt> when <tt>csq</tt> is not <tt>null</tt>, behaves in |
| * exactly the same way as the invocation |
| * |
| * <pre> |
| * out.write(csq.subSequence(start, end).toString()) </pre> |
| * |
| * @param csq |
| * The character sequence from which a subsequence will be |
| * appended. If <tt>csq</tt> is <tt>null</tt>, then characters |
| * will be appended as if <tt>csq</tt> contained the four |
| * characters <tt>"null"</tt>. |
| * |
| * @param start |
| * The index of the first character in the subsequence |
| * |
| * @param end |
| * The index of the character following the last character in the |
| * subsequence |
| * |
| * @return This writer |
| * |
| * @throws IndexOutOfBoundsException |
| * If <tt>start</tt> or <tt>end</tt> are negative, <tt>start</tt> |
| * is greater than <tt>end</tt>, or <tt>end</tt> is greater than |
| * <tt>csq.length()</tt> |
| * |
| * @since 1.5 |
| */ |
| public CharArrayWriter append(CharSequence csq, int start, int end) { |
| String s = (csq == null ? "null" : csq).subSequence(start, end).toString(); |
| write(s, 0, s.length()); |
| return this; |
| } |
| |
| /** |
| * Appends the specified character to this writer. |
| * |
| * <p> An invocation of this method of the form <tt>out.append(c)</tt> |
| * behaves in exactly the same way as the invocation |
| * |
| * <pre> |
| * out.write(c) </pre> |
| * |
| * @param c |
| * The 16-bit character to append |
| * |
| * @return This writer |
| * |
| * @since 1.5 |
| */ |
| public CharArrayWriter append(char c) { |
| write(c); |
| return this; |
| } |
| |
| /** |
| * Resets the buffer so that you can use it again without |
| * throwing away the already allocated buffer. |
| */ |
| public void reset() { |
| count = 0; |
| } |
| |
| /** |
| * Returns a copy of the input data. |
| * |
| * @return an array of chars copied from the input data. |
| */ |
| public char toCharArray()[] { |
| synchronized (lock) { |
| return Arrays.copyOf(buf, count); |
| } |
| } |
| |
| /** |
| * Returns the current size of the buffer. |
| * |
| * @return an int representing the current size of the buffer. |
| */ |
| public int size() { |
| return count; |
| } |
| |
| /** |
| * Converts input data to a string. |
| * @return the string. |
| */ |
| public String toString() { |
| synchronized (lock) { |
| return new String(buf, 0, count); |
| } |
| } |
| |
| /** |
| * Flush the stream. |
| */ |
| public void flush() { } |
| |
| /** |
| * Close the stream. This method does not release the buffer, since its |
| * contents might still be required. Note: Invoking this method in this class |
| * will have no effect. |
| */ |
| public void close() { } |
| |
| } |