/*
* 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.io.Reader;
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 Reader} 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);
}
public boolean hasNext() {
if (savedException != null){
throw new NoSuchElementException(savedException.toString());
}
return line != null;
}
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;
}
public void remove() {
throw new UnsupportedOperationException();
}
public Iterator<String> iterator() {
return this;
}
}