| /* |
| * 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.commons.net.nntp; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.commons.net.io.DotTerminatedMessageReader; |
| import org.apache.commons.net.io.Util; |
| |
| /** |
| * Wraps a {@link BufferedReader} and returns an {@code Iterable<String>} |
| * which returns the individual lines from the reader. |
| * @since 3.0 |
| */ |
| class ReplyIterator implements Iterator<String>, Iterable<String> { |
| |
| private final BufferedReader reader; |
| |
| private String line; |
| |
| private Exception savedException; |
| |
| /** |
| * |
| * @param _reader the reader to wrap |
| * @param addDotReader whether to additionally wrap the reader in a DotTerminatedMessageReader |
| * @throws IOException |
| */ |
| ReplyIterator(BufferedReader _reader, boolean addDotReader) throws IOException { |
| reader = addDotReader ? new DotTerminatedMessageReader(_reader) : _reader; |
| line = reader.readLine(); // prime the iterator |
| if (line == null) { |
| Util.closeQuietly(reader); |
| } |
| } |
| |
| ReplyIterator(BufferedReader _reader) throws IOException { |
| this(_reader, true); |
| } |
| |
| // @Override |
| @Override |
| public boolean hasNext() { |
| if (savedException != null){ |
| throw new NoSuchElementException(savedException.toString()); |
| } |
| return line != null; |
| } |
| |
| // @Override |
| @Override |
| public String next() throws NoSuchElementException { |
| if (savedException != null){ |
| throw new NoSuchElementException(savedException.toString()); |
| } |
| String prev = line; |
| if (prev == null) { |
| throw new NoSuchElementException(); |
| } |
| try { |
| line = reader.readLine(); // save next line |
| if (line == null) { |
| Util.closeQuietly(reader); |
| } |
| } catch (IOException ex) { |
| savedException = ex; // if it fails, save the exception, as it does not apply to this call |
| Util.closeQuietly(reader); |
| } |
| return prev; |
| } |
| |
| // @Override |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| // @Override |
| @Override |
| public Iterator<String> iterator() { |
| return this; |
| } |
| } |