| /* |
| * 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.tools.ant.util; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| /** |
| * Invokes {@link #processLine processLine} whenever a full line has |
| * been written to this stream. |
| * |
| * <p>Tries to be smart about line separators.</p> |
| */ |
| public abstract class LineOrientedOutputStream extends OutputStream { |
| |
| /** Initial buffer size. */ |
| private static final int INTIAL_SIZE = 132; |
| |
| /** Carriage return */ |
| private static final int CR = 0x0d; |
| |
| /** Linefeed */ |
| private static final int LF = 0x0a; |
| |
| private ByteArrayOutputStream buffer |
| = new ByteArrayOutputStream(INTIAL_SIZE); |
| private boolean skip = false; |
| |
| /** |
| * Write the data to the buffer and flush the buffer, if a line |
| * separator is detected. |
| * |
| * @param cc data to log (byte). |
| * @throws IOException if there is an error. |
| */ |
| public final void write(int cc) throws IOException { |
| final byte c = (byte) cc; |
| if ((c == LF) || (c == CR)) { |
| if (!skip) { |
| processBuffer(); |
| } |
| } else { |
| buffer.write(cc); |
| } |
| skip = (c == CR); |
| } |
| |
| /** |
| * Flush this log stream |
| * @throws IOException if there is an error. |
| */ |
| public final void flush() throws IOException { |
| if (buffer.size() > 0) { |
| processBuffer(); |
| } |
| } |
| |
| /** |
| * Converts the buffer to a string and sends it to |
| * <code>processLine</code> |
| * @throws IOException if there is an error. |
| */ |
| protected void processBuffer() throws IOException { |
| try { |
| processLine(buffer.toString()); |
| } finally { |
| buffer.reset(); |
| } |
| } |
| |
| /** |
| * Processes a line. |
| * |
| * @param line the line to log. |
| * @throws IOException if there is an error. |
| */ |
| protected abstract void processLine(String line) throws IOException; |
| |
| /** |
| * Writes all remaining |
| * @throws IOException if there is an error. |
| */ |
| public final void close() throws IOException { |
| if (buffer.size() > 0) { |
| processBuffer(); |
| } |
| super.close(); |
| } |
| |
| /** |
| * Write a block of characters to the output stream |
| * |
| * @param b the array containing the data |
| * @param off the offset into the array where data starts |
| * @param len the length of block |
| * |
| * @throws IOException if the data cannot be written into the stream. |
| */ |
| public final void write(byte[] b, int off, int len) throws IOException { |
| // find the line breaks and pass other chars through in blocks |
| int offset = off; |
| int blockStartOffset = offset; |
| int remaining = len; |
| while (remaining > 0) { |
| while (remaining > 0 && b[offset] != LF && b[offset] != CR) { |
| offset++; |
| remaining--; |
| } |
| // either end of buffer or a line separator char |
| int blockLength = offset - blockStartOffset; |
| if (blockLength > 0) { |
| buffer.write(b, blockStartOffset, blockLength); |
| } |
| while (remaining > 0 && (b[offset] == LF || b[offset] == CR)) { |
| write(b[offset]); |
| offset++; |
| remaining--; |
| } |
| blockStartOffset = offset; |
| } |
| } |
| |
| } |