8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/java/io/CharArrayWriter.java

@@ -0,0 +1,290 @@
+/*
+ * Copyright (c) 1996, 2016, 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       1.1
+ */
+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
+     *
+     * @throws  IndexOutOfBoundsException
+     *          If {@code off} is negative, or {@code len} is negative,
+     *          or {@code off + len} is negative or greater than the length
+     *          of the given array
+     */
+    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
+     *
+     * @throws  IndexOutOfBoundsException
+     *          If {@code off} is negative, or {@code len} is negative,
+     *          or {@code off + len} is negative or greater than the length
+     *          of the given string
+     */
+    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 {@code out.append(csq)}
+     * behaves in exactly the same way as the invocation
+     *
+     * <pre>
+     *     out.write(csq.toString()) </pre>
+     *
+     * <p> Depending on the specification of {@code toString} for the
+     * character sequence {@code csq}, the entire sequence may not be
+     * appended. For instance, invoking the {@code toString} 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 {@code csq} is
+     *         {@code null}, then the four characters {@code "null"} are
+     *         appended to this writer.
+     *
+     * @return  This writer
+     *
+     * @since  1.5
+     */
+    public CharArrayWriter append(CharSequence csq) {
+        String s = String.valueOf(csq);
+        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
+     * {@code out.append(csq, start, end)} when
+     * {@code csq} is not {@code null}, 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 {@code csq} is {@code null}, then characters
+     *         will be appended as if {@code csq} contained the four
+     *         characters {@code "null"}.
+     *
+     * @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 {@code start} or {@code end} are negative, {@code start}
+     *          is greater than {@code end}, or {@code end} is greater than
+     *          {@code csq.length()}
+     *
+     * @since  1.5
+     */
+    public CharArrayWriter append(CharSequence csq, int start, int end) {
+        if (csq == null) csq = "null";
+        return append(csq.subSequence(start, end));
+    }
+
+    /**
+     * Appends the specified character to this writer.
+     *
+     * <p> An invocation of this method of the form {@code out.append(c)}
+     * 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() { }
+
+}