package cc.halley.java.util;

import java.io.IOException;
import java.io.OutputStream;

/**
 * An OutputStream that collects all of the output into a new StringBuffer.
 *
 * We use StringBuffer instead of StringBuilder, for thread safety.
 */
public class StringBufferOutputStream
    extends OutputStream
{
        protected StringBuffer buffer = new StringBuffer();
        protected boolean closed = false;

        synchronized public void write(int b)
                throws IOException
        {
                if (closed)
                        throw new IOException("StringBufferOutputStream already closed.");
                buffer.append((char)b);
        }

    public void write(byte[] b)
        throws IOException
        { write(b, 0, b.length); }

    public void write(byte[] b, int off, int len)
        throws IOException
    {
                for (int i = off; i < off+len; i++)
                        write((int)b[i]);
    }

    public void close()
        throws IOException
    {
                if (closed)
                        throw new IOException("StringBufferOutputStream already closed.");
        closed = true;
    }

    public void flush()
        throws IOException
    {
                if (closed)
                        throw new IOException("StringBufferOutputStream already closed.");
    }

    public boolean equals(Object obj)
    {
                if (obj instanceof String)
                        return toString().equals(obj);
            return super.equals(obj);
    }

    synchronized public int hashCode()
                { return buffer.hashCode(); }

    synchronized public String toString()
                { return buffer.toString(); }
}