package org.apache.lucene.store;
/**
* 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 java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.HashSet;
/**
* Expert: A Directory instance that switches files between
* two other Directory instances.
* <p>Files with the specified extensions are placed in the
* primary directory; others are placed in the secondary
* directory. The provided Set must not change once passed
* to this class, and must allow multiple threads to call
* contains at once.</p>
*
* <p><b>NOTE</b>: this API is new and experimental and is
* subject to suddenly change in the next release.
*/
public class FileSwitchDirectory extends Directory {
private final Directory secondaryDir;
private final Directory primaryDir;
private final Set primaryExtensions;
private boolean doClose;
public FileSwitchDirectory(Set primaryExtensions, Directory primaryDir, Directory secondaryDir, boolean doClose) {
this.primaryExtensions = primaryExtensions;
this.primaryDir = primaryDir;
this.secondaryDir = secondaryDir;
this.doClose = doClose;
this.lockFactory = primaryDir.getLockFactory();
}
/** Return the primary directory */
public Directory getPrimaryDir() {
return primaryDir;
}
/** Return the secondary directory */
public Directory getSecondaryDir() {
return secondaryDir;
}
public void close() throws IOException {
if (doClose) {
try {
secondaryDir.close();
} finally {
primaryDir.close();
}
doClose = false;
}
}
public String[] listAll() throws IOException {
Set files = new HashSet();
files.addAll(Arrays.asList(primaryDir.listAll()));
files.addAll(Arrays.asList(secondaryDir.listAll()));
return (String[]) files.toArray(new String[files.size()]);
}
public String[] list() throws IOException {
return listAll();
}
/** Utility method to return a file's extension. */
public static String getExtension(String name) {
int i = name.lastIndexOf('.');
if (i == -1) {
return "";
}
return name.substring(i+1, name.length());
}
private Directory getDirectory(String name) {
String ext = getExtension(name);
if (primaryExtensions.contains(ext)) {
return primaryDir;
} else {
return secondaryDir;
}
}
public boolean fileExists(String name) throws IOException {
return getDirectory(name).fileExists(name);
}
public long fileModified(String name) throws IOException {
return getDirectory(name).fileModified(name);
}
public void touchFile(String name) throws IOException {
getDirectory(name).touchFile(name);
}
public void deleteFile(String name) throws IOException {
getDirectory(name).deleteFile(name);
}
public void renameFile(String from, String to) throws IOException {
getDirectory(from).renameFile(from, to);
}
public long fileLength(String name) throws IOException {
return getDirectory(name).fileLength(name);
}
public IndexOutput createOutput(String name) throws IOException {
return getDirectory(name).createOutput(name);
}
public void sync(String name) throws IOException {
getDirectory(name).sync(name);
}
public IndexInput openInput(String name) throws IOException {
return getDirectory(name).openInput(name);
}
}