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Copy pathCharArrayWriter.java
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294 lines (274 loc) · 8.99 KB
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/*
* Copyright (c) 1996, 2024, 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;
import java.util.Objects;
/**
* This class implements a character buffer that can be used as a 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.
* @throws 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) {
Objects.checkFromIndexSize(off, len, c.length);
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)}
* when {@code csq} is not {@code null}, behaves in exactly the same way
* as the invocation
*
* {@snippet lang=java :
* out.write(csq.toString())
* }
*
* <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
*
* {@snippet lang=java :
* out.write(csq.subSequence(start, end).toString())
* }
*
* @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
*
* {@snippet lang=java :
* out.write(c)
* }
*
* @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.
*
* <p> The {@code flush} method of {@code CharArrayWriter} does nothing.
*/
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() { }
}