package org.apache.lucene.index;
/**
* 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.
*/
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.store.IndexInput;
import java.util.LinkedList;
import java.util.HashSet;
import java.io.IOException;
/**
* Combines multiple files into a single compound file.
* The file format:<br>
* <ul>
* <li>VInt fileCount</li>
* <li>{Directory}
* fileCount entries with the following structure:</li>
* <ul>
* <li>long dataOffset</li>
* <li>String fileName</li>
* </ul>
* <li>{File Data}
* fileCount entries with the raw data of the corresponding file</li>
* </ul>
*
* The fileCount integer indicates how many files are contained in this compound
* file. The {directory} that follows has that many entries. Each directory entry
* contains a long pointer to the start of this file's data section, and a String
* with that file's name.
*/
final class CompoundFileWriter {
private static final class FileEntry {
/** source file */
String file;
/** temporary holder for the start of directory entry for this file */
long directoryOffset;
/** temporary holder for the start of this file's data section */
long dataOffset;
}
private Directory directory;
private String fileName;
private HashSet<String> ids;
private LinkedList<FileEntry> entries;
private boolean merged = false;
private SegmentMerger.CheckAbort checkAbort;
/** Create the compound stream in the specified file. The file name is the
* entire name (no extensions are added).
* @throws NullPointerException if <code>dir</code> or <code>name</code> is null
*/
public CompoundFileWriter(Directory dir, String name) {
this(dir, name, null);
}
CompoundFileWriter(Directory dir, String name, SegmentMerger.CheckAbort checkAbort) {
if (dir == null)
throw new NullPointerException("directory cannot be null");
if (name == null)
throw new NullPointerException("name cannot be null");
this.checkAbort = checkAbort;
directory = dir;
fileName = name;
ids = new HashSet<String>();
entries = new LinkedList<FileEntry>();
}
/** Returns the directory of the compound file. */
public Directory getDirectory() {
return directory;
}
/** Returns the name of the compound file. */
public String getName() {
return fileName;
}
/** Add a source stream. <code>file</code> is the string by which the
* sub-stream will be known in the compound stream.
*
* @throws IllegalStateException if this writer is closed
* @throws NullPointerException if <code>file</code> is null
* @throws IllegalArgumentException if a file with the same name
* has been added already
*/
public void addFile(String file) {
if (merged)
throw new IllegalStateException(
"Can't add extensions after merge has been called");
if (file == null)
throw new NullPointerException(
"file cannot be null");
if (! ids.add(file))
throw new IllegalArgumentException(
"File " + file + " already added");
FileEntry entry = new FileEntry();
entry.file = file;
entries.add(entry);
}
/** Merge files with the extensions added up to now.
* All files with these extensions are combined sequentially into the
* compound stream. After successful merge, the source files
* are deleted.
* @throws IllegalStateException if close() had been called before or
* if no file has been added to this object
*/
public void close() throws IOException {
if (merged)
throw new IllegalStateException(
"Merge already performed");
if (entries.isEmpty())
throw new IllegalStateException(
"No entries to merge have been defined");
merged = true;
// open the compound stream
IndexOutput os = null;
try {
os = directory.createOutput(fileName);
// Write the number of entries
os.writeVInt(entries.size());
// Write the directory with all offsets at 0.
// Remember the positions of directory entries so that we can
// adjust the offsets later
long totalSize = 0;
for (FileEntry fe : entries) {
fe.directoryOffset = os.getFilePointer();
os.writeLong(0); // for now
os.writeString(fe.file);
totalSize += directory.fileLength(fe.file);
}
// Pre-allocate size of file as optimization --
// this can potentially help IO performance as
// we write the file and also later during
// searching. It also uncovers a disk-full
// situation earlier and hopefully without
// actually filling disk to 100%:
final long finalLength = totalSize+os.getFilePointer();
os.setLength(finalLength);
// Open the files and copy their data into the stream.
// Remember the locations of each file's data section.
byte buffer[] = new byte[16384];
for (FileEntry fe : entries) {
fe.dataOffset = os.getFilePointer();
copyFile(fe, os, buffer);
}
// Write the data offsets into the directory of the compound stream
for (FileEntry fe : entries) {
os.seek(fe.directoryOffset);
os.writeLong(fe.dataOffset);
}
assert finalLength == os.length();
// Close the output stream. Set the os to null before trying to
// close so that if an exception occurs during the close, the
// finally clause below will not attempt to close the stream
// the second time.
IndexOutput tmp = os;
os = null;
tmp.close();
} finally {
if (os != null) try { os.close(); } catch (IOException e) { }
}
}
/** Copy the contents of the file with specified extension into the
* provided output stream. Use the provided buffer for moving data
* to reduce memory allocation.
*/
private void copyFile(FileEntry source, IndexOutput os, byte buffer[])
throws IOException
{
IndexInput is = null;
try {
long startPtr = os.getFilePointer();
is = directory.openInput(source.file);
long length = is.length();
long remainder = length;
int chunk = buffer.length;
while(remainder > 0) {
int len = (int) Math.min(chunk, remainder);
is.readBytes(buffer, 0, len, false);
os.writeBytes(buffer, len);
remainder -= len;
if (checkAbort != null)
// Roughly every 2 MB we will check if
// it's time to abort
checkAbort.work(80);
}
// Verify that remainder is 0
if (remainder != 0)
throw new IOException(
"Non-zero remainder length after copying: " + remainder
+ " (id: " + source.file + ", length: " + length
+ ", buffer size: " + chunk + ")");
// Verify that the output length diff is equal to original file
long endPtr = os.getFilePointer();
long diff = endPtr - startPtr;
if (diff != length)
throw new IOException(
"Difference in the output file offsets " + diff
+ " does not match the original file length " + length);
} finally {
if (is != null) is.close();
}
}
}