| /* |
| * 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.olingo.server.core.deserializer.batch; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.ByteBuffer; |
| import java.nio.charset.Charset; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.olingo.commons.api.format.ContentType; |
| import org.apache.olingo.commons.api.http.HttpHeader; |
| |
| public class BatchLineReader { |
| private static final byte CR = '\r'; |
| private static final byte LF = '\n'; |
| private static final int EOF = -1; |
| private static final int BUFFER_SIZE = 8192; |
| private static final Charset DEFAULT_CHARSET = Charset.forName("ISO-8859-1"); |
| public static final String BOUNDARY = "boundary"; |
| public static final String DOUBLE_DASH = "--"; |
| public static final String CRLF = "\r\n"; |
| public static final String LFS = "\n"; |
| private Charset currentCharset = DEFAULT_CHARSET; |
| private String currentBoundary = null; |
| private ReadState readState = new ReadState(); |
| private InputStream reader; |
| private byte[] buffer; |
| private int offset = 0; |
| private int limit = 0; |
| |
| public BatchLineReader(final InputStream reader) { |
| this(reader, BUFFER_SIZE); |
| } |
| |
| public BatchLineReader(final InputStream reader, final int bufferSize) { |
| if (bufferSize <= 0) { |
| throw new IllegalArgumentException("Buffer size must be greater than zero."); |
| } |
| |
| this.reader = reader; |
| buffer = new byte[bufferSize]; |
| } |
| |
| public void close() throws IOException { |
| reader.close(); |
| } |
| |
| public List<String> toList() throws IOException { |
| final List<String> result = new ArrayList<>(); |
| String currentLine = readLine(); |
| if (currentLine != null) { |
| currentBoundary = currentLine.trim(); |
| result.add(currentLine); |
| |
| while ((currentLine = readLine()) != null) { |
| result.add(currentLine); |
| } |
| } |
| return result; |
| } |
| |
| public List<Line> toLineList() throws IOException { |
| final List<Line> result = new ArrayList<>(); |
| String currentLine = readLine(); |
| if (currentLine != null) { |
| currentBoundary = currentLine.trim(); |
| int counter = 1; |
| result.add(new Line(currentLine, counter++)); |
| |
| while ((currentLine = readLine()) != null) { |
| result.add(new Line(currentLine, counter++)); |
| } |
| } |
| |
| return result; |
| } |
| |
| private void updateCurrentCharset(final String currentLine) { |
| if (currentLine != null) { |
| if (currentLine.startsWith(HttpHeader.CONTENT_TYPE)) { |
| int cutOff = currentLine.endsWith(CRLF) ? 2 : currentLine.endsWith(LFS) ? 1 : 0; |
| final ContentType contentType = ContentType.parse( |
| currentLine.substring(HttpHeader.CONTENT_TYPE.length() + 1, currentLine.length() - cutOff).trim()); |
| if (contentType != null) { |
| final String charsetString = contentType.getParameter(ContentType.PARAMETER_CHARSET); |
| currentCharset = charsetString == null ? |
| contentType.isCompatible(ContentType.APPLICATION_JSON) || contentType.getSubtype().contains("xml") ? |
| Charset.forName("UTF-8") : |
| DEFAULT_CHARSET : |
| Charset.forName(charsetString); |
| |
| final String boundary = contentType.getParameter(BOUNDARY); |
| if (boundary != null) { |
| currentBoundary = DOUBLE_DASH + boundary; |
| } |
| } |
| } else if (CRLF.equals(currentLine) || LFS.equals(currentLine)) { |
| readState.foundLinebreak(); |
| } else if (isBoundary(currentLine)) { |
| readState.foundBoundary(); |
| } |
| } |
| } |
| |
| private boolean isBoundary(final String currentLine) { |
| return (currentBoundary + CRLF).equals(currentLine) |
| || (currentBoundary + LFS).equals(currentLine) |
| || (currentBoundary + DOUBLE_DASH + CRLF).equals(currentLine) |
| || (currentBoundary + DOUBLE_DASH + LFS).equals(currentLine); |
| } |
| |
| String readLine() throws IOException { |
| if (limit == EOF) { |
| return null; |
| } |
| |
| ByteBuffer innerBuffer = ByteBuffer.allocate(BUFFER_SIZE); |
| // EOF will be considered as line ending |
| boolean foundLineEnd = false; |
| |
| while (!foundLineEnd) { |
| // Is buffer refill required? |
| if (limit == offset && fillBuffer() == EOF) { |
| foundLineEnd = true; |
| } |
| |
| if (!foundLineEnd) { |
| byte currentChar = buffer[offset++]; |
| if (!innerBuffer.hasRemaining()) { |
| innerBuffer.flip(); |
| ByteBuffer tmp = ByteBuffer.allocate(innerBuffer.limit() * 2); |
| tmp.put(innerBuffer); |
| innerBuffer = tmp; |
| } |
| innerBuffer.put(currentChar); |
| |
| if (currentChar == LF) { |
| foundLineEnd = true; |
| } else if (currentChar == CR) { |
| foundLineEnd = true; |
| |
| // Check next byte. Consume \n if available |
| // Is buffer refill required? |
| if (limit == offset) { |
| fillBuffer(); |
| } |
| |
| // Check if there is at least one character |
| if (limit != EOF && buffer[offset] == LF) { |
| innerBuffer.put(LF); |
| offset++; |
| } |
| } |
| } |
| } |
| |
| if (innerBuffer.position() == 0) { |
| return null; |
| } else { |
| final String currentLine = new String(innerBuffer.array(), 0, innerBuffer.position(), |
| readState.isReadBody() ? currentCharset : DEFAULT_CHARSET); |
| updateCurrentCharset(currentLine); |
| return currentLine; |
| } |
| } |
| |
| private int fillBuffer() throws IOException { |
| limit = reader.read(buffer, 0, buffer.length); |
| offset = 0; |
| |
| return limit; |
| } |
| |
| /** |
| * Read state indicator (whether currently the <code>body</code> or <code>header</code> part is read). |
| */ |
| private static class ReadState { |
| private int state = 0; |
| |
| public void foundLinebreak() { |
| state++; |
| } |
| |
| public void foundBoundary() { |
| state = 0; |
| } |
| |
| public boolean isReadBody() { |
| return state >= 2; |
| } |
| |
| @Override |
| public String toString() { |
| return String.valueOf(state); |
| } |
| } |
| } |