code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the  "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.xsltc.runtime.output;
  
  import java.io.BufferedWriter;
  import java.io.IOException;
  import java.io.Writer;
  
  /**
   * @author Santiago Pericas-Geertsen
   */
  class WriterOutputBuffer implements OutputBuffer {
      private static final int KB = 1024;
      private static int BUFFER_SIZE = 4 * KB;
  
      static {
  	// Set a larger buffer size for Solaris
  	final String osName = System.getProperty("os.name");
  	if (osName.equalsIgnoreCase("solaris")) {
  	    BUFFER_SIZE = 32 * KB;
  	}
      }
  
      private Writer _writer;
  
      /**
       * Initializes a WriterOutputBuffer by creating an instance of a 
       * BufferedWriter. The size of the buffer in this writer may have 
       * a significant impact on throughput. Solaris prefers a larger
       * buffer, while Linux works better with a smaller one.
       */
      public WriterOutputBuffer(Writer writer) {
  	_writer = new BufferedWriter(writer, BUFFER_SIZE);
      }
  
      public String close() {
  	try {
  	    _writer.flush();
  	}
  	catch (IOException e) {
  	    throw new RuntimeException(e.toString());
  	}
  	return "";
      }
  
      public OutputBuffer append(String s) {
  	try {
  	    _writer.write(s);
  	}
  	catch (IOException e) {
  	    throw new RuntimeException(e.toString());
  	}
  	return this;
      }
  
      public OutputBuffer append(char[] s, int from, int to) {
  	try {
  	    _writer.write(s, from, to);
  	}
  	catch (IOException e) {
  	    throw new RuntimeException(e.toString());
  	}
  	return this;
      }
  
      public OutputBuffer append(char ch) {
  	try {
  	    _writer.write(ch);
  	}
  	catch (IOException e) {
  	    throw new RuntimeException(e.toString());
  	}
  	return this;
      }
  }
  
  
  