package org.caudexorigo.io;
import java.io.IOException;
import java.io.Writer;
public class UnsynchronizedStringWriter extends Writer
{
private StringBuilder buf;
/**
* Create a new string writer using the default initial string-buffer size.
*/
public UnsynchronizedStringWriter()
{
buf = new StringBuilder();
lock = buf;
}
/**
* Create a new string writer using the specified initial string-buffer size.
*
* @param initialSize
* The number of <tt>char</tt> values that will fit into this buffer before it is automatically expanded
*
* @throws IllegalArgumentException
* If <tt>initialSize</tt> is negative
*/
public UnsynchronizedStringWriter(int initialSize)
{
if (initialSize < 0)
{
throw new IllegalArgumentException("Negative buffer size");
}
buf = new StringBuilder(initialSize);
lock = buf;
}
/**
* Write a single character.
*/
public void write(int c)
{
buf.append((char) c);
}
/**
* Write a portion of an array of characters.
*
* @param cbuf
* Array of characters
* @param off
* Offset from which to start writing characters
* @param len
* Number of characters to write
*/
public void write(char cbuf[], int off, int len)
{
if ((off < 0) || (off > cbuf.length) || (len < 0) || ((off + len) > cbuf.length) || ((off + len) < 0))
{
throw new IndexOutOfBoundsException();
}
else if (len == 0)
{
return;
}
buf.append(cbuf, off, len);
}
/**
* Write a string.
*/
public void write(String str)
{
buf.append(str);
}
/**
* Write a portion of a string.
*
* @param str
* String to be written
* @param off
* Offset from which to start writing characters
* @param len
* Number of characters to write
*/
public void write(String str, int off, int len)
{
buf.append(str.substring(off, off + len));
}
/**
* 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 UnsynchronizedStringWriter append(CharSequence csq)
{
if (csq == null)
write("null");
else
write(csq.toString());
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 UnsynchronizedStringWriter append(CharSequence csq, int start, int end)
{
CharSequence cs = (csq == null ? "null" : csq);
write(cs.subSequence(start, end).toString());
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 UnsynchronizedStringWriter append(char c)
{
write(c);
return this;
}
/**
* Return the buffer's current value as a string.
*/
public String toString()
{
return buf.toString();
}
/**
* Return the string buffer itself.
*
* @return StringBuffer holding the current buffer value.
*/
public StringBuilder getBuffer()
{
return buf;
}
/**
* Flush the stream.
*/
public void flush()
{
}
/**
* Closing a <tt>StringWriter</tt> has no effect. The methods in this class can be called after the stream has been closed without generating an <tt>IOException</tt>.
*/
public void close() throws IOException
{
}
}