jtulach@67: package api;
jtulach@67: 
jtulach@67: import java.io.IOException;
jtulach@67: 
jtulach@67: /**
jtulach@67:  *
jtulach@67:  * @author Jaroslav Tulach
jtulach@67:  */
jtulach@67: final class SimpleBuffer implements Writer.ImplSeq {
jtulach@67:     private final Writer out;
jtulach@67:     private final StringBuffer sb = new StringBuffer();
jtulach@67:     
jtulach@67:     public SimpleBuffer(Writer out) {
jtulach@67:         this.out = out;
jtulach@67:     }
jtulach@67: 
jtulach@67:     public void close() throws IOException {
jtulach@67:         flush();
jtulach@67:         out.close();
jtulach@67:     }
jtulach@67: 
jtulach@67:     public void flush() throws IOException {
jtulach@67:         if (sb.length() > 0) {
jtulach@67:             out.write(sb.toString());
jtulach@67:             sb.setLength(0);
jtulach@67:             out.flush();
jtulach@67:         }
jtulach@67:     }
jtulach@67: 
jtulach@67:     public void write(CharSequence seq) throws IOException {
jtulach@210:         if (shouldBufferAsTheSequenceIsNotTooBig(seq)) {
jtulach@67:             sb.append(seq);
jtulach@67:         } else {
jtulach@67:             flush();
jtulach@67:             out.append(seq);
jtulach@67:         }
jtulach@67:     }
jtulach@67: 
jtulach@210:     /** At the end the purpose of BufferedWriter is to buffer writes, this
jtulach@210:      * method is here to decide when it is OK to prefer buffering and when 
jtulach@210:      * it is better to delegate directly into the underlaying stream.
jtulach@210:      * 
jtulach@210:      * @param csq the seqence to evaluate
jtulach@210:      * @return true if buffering from super class should be used
jtulach@210:      */
jtulach@210:     private static boolean shouldBufferAsTheSequenceIsNotTooBig(CharSequence csq) {
jtulach@210:         if (csq == null) {
jtulach@210:             return false;
jtulach@210:         }
jtulach@210:         // as buffers are usually bigger than 1024, it makes sense to 
jtulach@210:         // pay the penalty of converting the sequence to string, but buffering
jtulach@210:         // the write
jtulach@210:         if (csq.length() < 1024) {
jtulach@210:             return true;
jtulach@210:         } else {
jtulach@210:             // otherwise, just directly write down the char sequence
jtulach@210:             return false;
jtulach@210:         }
jtulach@210:     }
jtulach@210:     
jtulach@67: }