| // Copyright (C) 2014 The Android Open Source Project |
| // |
| // Licensed 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 com.googlesource.gerrit.plugins.web; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.Arrays; |
| |
| class LookAheadFileInputStream extends BufferedInputStream { |
| private static final int NEWLINE_CR = '\r'; |
| private static final int NEWLINE_NL = '\n'; |
| private static final int BUFFER_SIZE = 1024; |
| |
| private int lineNr = 1; |
| private int lastChar = NEWLINE_NL; |
| |
| private final String fileExtension; |
| private final String fileName; |
| private final Path currentDir; |
| |
| public LookAheadFileInputStream(Path inputFile) throws IOException { |
| super(Files.newInputStream(inputFile), BUFFER_SIZE); |
| |
| fileName = inputFile.getFileName().toString(); |
| fileExtension = fileName.substring(fileName.lastIndexOf('.') + 1); |
| currentDir = inputFile.getParent(); |
| } |
| |
| @Override |
| public String toString() { |
| return "pos=" |
| + pos |
| + " count=" |
| + count |
| + " lineNr=" |
| + lineNr |
| + " buffer=\'" |
| + new String(buf, pos, count - pos) |
| + "'"; |
| } |
| |
| @Override |
| public synchronized int read() throws IOException { |
| lastChar = super.read(); |
| if (isNewLine()) { |
| lineNr++; |
| } |
| return lastChar; |
| } |
| |
| @Override |
| public int read(byte[] b) throws IOException { |
| return read(b, 0, b.length); |
| } |
| |
| @Override |
| public synchronized int read(byte[] b, int off, int len) throws IOException { |
| int numBytes = super.read(b, off, len); |
| if (numBytes > 0) { |
| lastChar = b[off + numBytes - 1]; |
| } |
| return numBytes; |
| } |
| |
| public synchronized boolean startsWith(String includeVirtualPrefix) throws IOException { |
| mark(includeVirtualPrefix.length()); |
| try { |
| byte[] cmp = new byte[includeVirtualPrefix.length()]; |
| super.read(cmp); |
| return Arrays.equals(includeVirtualPrefix.getBytes(), cmp); |
| } finally { |
| reset(); |
| } |
| } |
| |
| public boolean isNewLine() { |
| return isNewLine(lastChar); |
| } |
| |
| public boolean isNewLine(int last) { |
| return last == NEWLINE_CR || last == NEWLINE_NL; |
| } |
| |
| public String getFileExtension() { |
| return fileExtension; |
| } |
| |
| public int getLineNr() { |
| return lineNr; |
| } |
| |
| public String getFileName() { |
| return fileName; |
| } |
| |
| public Path getCurrentDir() { |
| return currentDir; |
| } |
| } |