package org.caudexorigo.io;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
public class UnsynchronizedCharArrayWriter 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 UnsynchronizedCharArrayWriter()
{
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 UnsynchronizedCharArrayWriter(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)
{
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;
}
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)
{
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
{
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 UnsynchronizedCharArrayWriter 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 UnsynchronizedCharArrayWriter 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 UnsynchronizedCharArrayWriter 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()[]
{
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()
{
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()
{
}
}