| /* |
| * 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.geronimo.javamail.transport.nntp; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.UnsupportedEncodingException; |
| import java.util.List; |
| |
| /** |
| * @version $Rev$ $Date$ |
| */ |
| public class StringListInputStream extends InputStream { |
| // the list of lines we're reading from |
| protected List lines; |
| |
| // the next line to process. |
| protected int nextLine = 0; |
| |
| // current buffer of bytes to read from |
| byte[] buffer; |
| |
| // current offset within the buffer; |
| int offset; |
| |
| // indicator that we've left off at a split between the CR and LF of a line |
| // break. |
| boolean atLineBreak = false; |
| |
| public StringListInputStream(List lines) throws IOException { |
| this.lines = lines; |
| nextLine = 0; |
| buffer = null; |
| offset = 0; |
| atLineBreak = false; |
| |
| // if we have at least one line in the list, get the bytes now. |
| if (lines.size() > 0) { |
| nextBuffer(); |
| } |
| } |
| |
| /** |
| * Just override the single byte read version, which handles all of the |
| * lineend markers correctly. |
| * |
| * @return The next byte from the stream or -1 if we've hit the EOF. |
| */ |
| public int read() throws IOException { |
| // leave off at the split between a line? |
| if (atLineBreak) { |
| // flip this off and return the second line end character. Also step |
| // to the next line. |
| atLineBreak = false; |
| nextBuffer(); |
| return '\n'; |
| } |
| // gone past the end? Got an EOF |
| if (buffer == null) { |
| return -1; |
| } |
| |
| // reach the end of the line? |
| if (offset >= buffer.length) { |
| // we're now working on a virtual linebreak |
| atLineBreak = true; |
| return '\r'; |
| } |
| // just return the next byte |
| return buffer[offset++]; |
| |
| } |
| |
| /** |
| * Step to the next buffer of string data. |
| * |
| * @exception IOException |
| */ |
| protected void nextBuffer() throws IOException { |
| // give an eof check. |
| if (nextLine >= lines.size()) { |
| buffer = null; |
| } else { |
| try { |
| String next = (String) lines.get(nextLine++); |
| buffer = next.getBytes("US-ASCII"); |
| |
| } catch (UnsupportedEncodingException e) { |
| throw new IOException("Invalid string encoding"); |
| } |
| } |
| |
| offset = 0; |
| } |
| } |