| /* |
| * 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.lucene.gradle; |
| |
| import java.io.IOException; |
| import java.io.Writer; |
| |
| /** |
| * Prefixes every new line with a given string, synchronizing multiple streams to emit consistent lines. |
| */ |
| public class PrefixedWriter extends Writer { |
| Writer sink; |
| |
| private final static char LF = '\n'; |
| private final String prefix; |
| private final StringBuilder lineBuffer = new StringBuilder(); |
| private final int maxLineLength; |
| |
| public PrefixedWriter(String prefix, Writer sink, int maxLineLength) { |
| super(sink); |
| this.sink = sink; |
| this.prefix = prefix; |
| this.maxLineLength = maxLineLength; |
| } |
| |
| @Override |
| public void write(int c) throws IOException { |
| if (lineBuffer.length() == maxLineLength || c == LF) { |
| sink.write(prefix); |
| sink.write(lineBuffer.toString()); |
| sink.write(LF); |
| |
| lineBuffer.setLength(0); |
| if (c != LF) { |
| lineBuffer.append((char) c); |
| } |
| } else { |
| lineBuffer.append((char) c); |
| } |
| } |
| |
| @Override |
| public void write(char[] cbuf, int off, int len) throws IOException { |
| for (int i = off; i < off + len; i++) { |
| write(cbuf[i]); |
| } |
| } |
| |
| @Override |
| public void flush() throws IOException { |
| // don't pass flushes. |
| } |
| |
| @Override |
| public void close() throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| /** |
| * Complete the current line (emit LF if not at the start of the line already). |
| */ |
| public void completeLine() throws IOException { |
| if (lineBuffer.length() > 0) { |
| write(LF); |
| } |
| } |
| } |