/*
* This file is part of the Wayback archival access software
* (http://archive-access.sourceforge.net/projects/wayback/).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA 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.archive.wayback.util.flatfile;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.NoSuchElementException;
import org.archive.util.iterator.CloseableIterator;
/**
* Iterator that returns sequential lines from a file.
*
* @author brad
* @version $Date$, $Revision$
*/
public class RecordIterator implements CloseableIterator<String> {
private BufferedReader br;
protected String next = null;
protected boolean done = false;
/**
* @param br
*/
public RecordIterator(BufferedReader br) {
this.br = br;
if(br == null) {
done = true;
}
}
public boolean hasNext() {
if (next != null)
return true;
if(done) {
return false;
}
try {
String nextLine = br.readLine();
if (nextLine == null) {
close();
} else {
next = nextLine;
}
} catch (IOException e) {
throw new RuntimeException(e);
}
return (next != null);
}
public String next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
// 'next' is guaranteed non-null by a hasNext() which returned true
String returnString = this.next;
this.next = null;
return returnString;
}
/**
* @throws IOException
*/
public void close() throws IOException {
if(done == false) {
done = true;
br.close();
}
}
/* (non-Javadoc)
* @see java.util.Iterator#remove()
*/
public void remove() {
throw new RuntimeException("unsupported remove");
}
}