| /* |
| * 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. |
| */ |
| |
| package org.apache.myfaces.tobago.internal.util; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| /** |
| * Buffering scheme: we use a tremendously simple buffering |
| * scheme that greatly reduces the number of calls into the |
| * Writer/PrintWriter. In practice this has produced significant |
| * measured performance gains (at least in JDK 1.3.1). We only |
| * support adding single characters to the buffer, so anytime |
| * multiple characters need to be written out, the entire buffer |
| * gets flushed. In practice, this is good enough, and keeps |
| * the core simple. |
| */ |
| public class ResponseWriterBuffer { |
| |
| private static final int BUFFER_SIZE = 64; |
| |
| private final char[] buff = new char[BUFFER_SIZE]; |
| |
| private int bufferIndex; |
| |
| private final Writer writer; |
| |
| public ResponseWriterBuffer(final Writer writer) { |
| this.writer = writer; |
| } |
| |
| /** |
| * Add a character to the buffer, flushing the buffer if the buffer is |
| * full, and returning the new buffer index |
| */ |
| public void addToBuffer(final char ch) throws IOException { |
| if (bufferIndex >= BUFFER_SIZE) { |
| writer.write(buff, 0, bufferIndex); |
| bufferIndex = 0; |
| } |
| |
| buff[bufferIndex++] = ch; |
| } |
| |
| public void addToBuffer(final char[] ch) throws IOException { |
| if (bufferIndex + ch.length >= BUFFER_SIZE) { |
| writer.write(buff, 0, bufferIndex); |
| bufferIndex = 0; |
| } |
| |
| System.arraycopy(ch, 0, buff, bufferIndex, ch.length); |
| bufferIndex += ch.length; |
| } |
| |
| /** |
| * Flush the contents of the buffer to the output stream |
| * and return the reset buffer index |
| */ |
| public void flushBuffer() throws IOException { |
| if (bufferIndex > 0) { |
| writer.write(buff, 0, bufferIndex); |
| } |
| bufferIndex = 0; |
| } |
| } |