/****************************************************************
* 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.james.nntpserver.repository;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.james.nntpserver.DateSinceFileFilter;
import org.apache.james.util.io.AndFileFilter;
import org.apache.james.util.io.ExtensionFileFilter;
import org.apache.james.util.io.IOUtil;
import org.apache.james.util.io.InvertedFileFilter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
/**
* Group is represented by a directory.
* Articles are stored in files with the name of file == article number
*
*/
class NNTPGroupImpl extends AbstractLogEnabled implements NNTPGroup {
/**
* The directory to which this group maps.
*/
private final File root;
/**
* The last article number in the group
*/
private int lastArticle;
/**
* The last article number in the group
*/
private int firstArticle;
/**
* The number of articles in the group.
*/
private int numOfArticles;
/**
* Whether the first, last, and total number of articles in the
* group have been read from disk.
* An instance may collect range info once. This involves disk I/O
*/
private boolean articleRangeInfoCollected = false;
/**
* The sole constructor for this particular NNTPGroupImpl.
*
* @param root the directory containing the articles
*/
NNTPGroupImpl(File root) {
this.root = root;
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getName()
*/
public String getName() {
return root.getName();
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getDescription()
*/
public String getDescription() {
return getName();
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#isPostAllowed()
*/
public boolean isPostAllowed() {
return true;
}
/**
* Generates the first, last, and number of articles from the
* information in the group directory.
*/
private void collectArticleRangeInfo() {
if ( articleRangeInfoCollected ) {
return;
}
String[] list = root.list();
int first = -1;
int last = -1;
for ( int i = 0 ; i < list.length ; i++ ) {
int num = Integer.parseInt(list[i]);
if ( first == -1 || num < first ) {
first = num;
}
if ( num > last ) {
last = num;
}
}
numOfArticles = list.length;
firstArticle = Math.max(first,0);
lastArticle = Math.max(last,0);
articleRangeInfoCollected = true;
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getNumberOfArticles()
*/
public int getNumberOfArticles() {
collectArticleRangeInfo();
return numOfArticles;
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getFirstArticleNumber()
*/
public int getFirstArticleNumber() {
collectArticleRangeInfo();
return firstArticle;
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getLastArticleNumber()
*/
public int getLastArticleNumber() {
collectArticleRangeInfo();
return lastArticle;
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getArticle(int)
*/
public NNTPArticle getArticle(int number) {
File f = new File(root,number + "");
return f.exists() ? new NNTPArticleImpl(this, f) : null;
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getArticlesSince(Date)
*/
public Iterator getArticlesSince(Date dt) {
File[] f = root.listFiles(new AndFileFilter
(new DateSinceFileFilter(dt.getTime()),
new InvertedFileFilter(new ExtensionFileFilter(".id"))));
List list = new ArrayList();
for ( int i = 0 ; i < f.length ; i++ ) {
list.add(new NNTPArticleImpl(this, f[i]));
}
return list.iterator();
}
/**
* @see org.apache.james.nntpserver.NNTPGroup#getArticles()
*/
public Iterator getArticles() {
File[] f = root.listFiles();
List list = new ArrayList();
for ( int i = 0 ; i < f.length ; i++ )
list.add(new NNTPArticleImpl(this, f[i]));
return list.iterator();
}
/**
* @see org.apache.james.nntpserver.repository.NNTPGroup#getListFormat()
*/
public String getListFormat() {
StringBuffer showBuffer =
new StringBuffer(128)
.append(getName())
.append(" ")
.append(getLastArticleNumber())
.append(" ")
.append(getFirstArticleNumber())
.append(" ")
.append((isPostAllowed() ? "y":"n"));
return showBuffer.toString();
}
/**
* @see org.apache.james.nntpserver.repository.NNTPGroup#getListNewsgroupsFormat()
*/
public String getListNewsgroupsFormat() {
StringBuffer showBuffer =
new StringBuffer(128)
.append(getName())
.append(" ")
.append(getDescription());
return showBuffer.toString();
}
/**
* @see org.apache.james.nntpserver.repository.NNTPGroup#addArticle(InputStream)
*/
public NNTPArticle addArticle(InputStream newsStream)
throws IOException {
File articleFile = null;
synchronized (this) {
int artNum;
if (numOfArticles < 0)
throw new IllegalStateException("NNTP Group is corrupt (articles < 0).");
else if (numOfArticles == 0) {
firstArticle = 1;
artNum = 1;
} else {
artNum = getLastArticleNumber() + 1;
}
articleFile = new File(root, artNum + "");
articleFile.createNewFile();
lastArticle = artNum;
numOfArticles++;
}
if (getLogger().isDebugEnabled()) {
getLogger().debug("Copying message to: "+articleFile.getAbsolutePath());
}
FileOutputStream fout = null;
try {
fout = new FileOutputStream(articleFile);
IOUtil.copy(newsStream,fout);
fout.flush();
} finally {
try {
if (fout != null) {
fout.close();
}
} catch (IOException ioe) {
// Ignore this exception so we don't
// trash any "real" exceptions
}
}
return new NNTPArticleImpl(this, articleFile);
}
// public NNTPArticle getArticleFromID(String id) {
// if ( id == null )
// return null;
// int idx = id.indexOf('@');
// if ( idx != -1 )
// id = id.substring(0,idx);
// File f = new File(root,id + ".id");
// if ( f.exists() == false )
// return null;
// try {
// FileInputStream fin = new FileInputStream(f);
// int count = fin.available();
// byte[] ba = new byte[count];
// fin.read(ba);
// fin.close();
// String str = new String(ba);
// int num = Integer.parseInt(str);
// return getArticle(num);
// } catch(IOException ioe) {
// throw new NNTPException("could not fectch article: "+id,ioe);
// }
// }
}
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