/*
* 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.jackrabbit.core.fs.mem;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.jackrabbit.core.fs.FileSystem;
import org.apache.jackrabbit.core.fs.FileSystemException;
/**
* An in-memory file system implementation.
*/
public class MemoryFileSystem implements FileSystem {
private Map<String, MemoryFileSystemEntry> entries = new HashMap<String, MemoryFileSystemEntry>();
public void close() {
}
private MemoryFile getFile(String filePath) throws FileSystemException {
MemoryFileSystemEntry entry = getEntry(filePath);
assertIsFile(filePath);
return (MemoryFile) entry;
}
public void createFolder(String folderPath) throws FileSystemException {
if (exists(folderPath)) {
throw new FileSystemException("Folder or file " + folderPath
+ " already exists");
}
if (!exists(FileSystem.SEPARATOR)) {
createFolderInternal("/");
}
String relativePath = folderPath.substring(1);
String[] pathElements = relativePath.split(FileSystem.SEPARATOR);
String currentFolderPath = "";
for (int i = 0; i < pathElements.length; i++) {
String pathElement = pathElements[i];
currentFolderPath += "/" + pathElement;
createFolderInternal(currentFolderPath);
}
}
private void createFolderInternal(String folderPath) {
MemoryFolder folder = new MemoryFolder();
entries.put(folderPath, folder);
}
public void deleteFile(String filePath) throws FileSystemException {
assertExistence(filePath);
entries.remove(filePath);
}
public void deleteFolder(String folderPath) throws FileSystemException {
assertIsFolder(folderPath);
Set<String> selectedNames = new HashSet<String>();
for (String name : entries.keySet()) {
if (name.equals(folderPath) || name.startsWith(folderPath + SEPARATOR)) {
selectedNames.add(name);
}
}
for (String name : selectedNames) {
entries.remove(name);
}
}
public boolean exists(String path) throws FileSystemException {
return entries.containsKey(path);
}
public InputStream getInputStream(String filePath)
throws FileSystemException {
assertExistence(filePath);
assertIsFile(filePath);
MemoryFile file = getFile(filePath);
return new ByteArrayInputStream(file.getData());
}
private void assertIsFolder(String folderPath) throws FileSystemException {
assertExistence(folderPath);
if (!getEntry(folderPath).isFolder()) {
throw new FileSystemException("Folder " + folderPath
+ " does not exist");
}
}
private void assertIsFile(String filePath) throws FileSystemException {
if (!isFile(filePath)) {
throw new FileSystemException(filePath + " is a folder");
}
}
public OutputStream getOutputStream(String filePath)
throws FileSystemException {
if (isFolder(filePath)) {
throw new FileSystemException("path denotes folder: " + filePath);
}
String folderPath = filePath;
if (filePath.lastIndexOf(FileSystem.SEPARATOR) > 0) {
folderPath = filePath.substring(0, filePath.lastIndexOf("/"));
} else {
folderPath = "/";
}
assertIsFolder(folderPath);
final MemoryFile file = new MemoryFile();
entries.put(filePath, file);
return new FilterOutputStream(new ByteArrayOutputStream()) {
public void write(byte[] bytes, int off, int len) throws IOException {
out.write(bytes, off, len);
}
public void close() throws IOException {
out.close();
file.setData(((ByteArrayOutputStream) out).toByteArray());
}
};
}
public boolean hasChildren(String path) throws FileSystemException {
assertIsFolder(path);
return list(path).length > 0;
}
public void init() {
createFolderInternal("/");
}
public boolean isFile(String path) throws FileSystemException {
return exists(path) && !getEntry(path).isFolder();
}
private MemoryFileSystemEntry getEntry(String path) {
return entries.get(path);
}
private void assertExistence(String path) throws FileSystemException {
if (!exists(path)) {
throw new FileSystemException("no such file " + path);
}
}
public boolean isFolder(String path) throws FileSystemException {
if (path.equals("/")) {
return true;
} else {
return exists(path) && getEntry(path).isFolder();
}
}
public long lastModified(String path) throws FileSystemException {
assertExistence(path);
return getEntry(path).getLastModified();
}
public long length(String filePath) throws FileSystemException {
assertIsFile(filePath);
return getFile(filePath).getData().length;
}
public String[] list(String folderPath) {
if (folderPath.equals("/")) {
folderPath = "";
}
Set<String> selectedNames = new HashSet<String>();
for (String name : entries.keySet()) {
if (name.matches(folderPath + "/[^/]*") && !name.equals("/")) {
selectedNames.add(name.substring(folderPath.length() + 1));
}
}
return selectedNames.toArray(new String[selectedNames.size()]);
}
public String[] listFiles(String folderPath) {
return listInternal(folderPath, false);
}
public String[] listFolders(String folderPath) {
return listInternal(folderPath, true);
}
private String[] listInternal(String folderPath, boolean isFolder) {
String[] names = list(folderPath);
if (folderPath.equals("/")) {
folderPath = "";
}
Set<String> result = new HashSet<String>();
for (String n : names) {
if (getEntry(folderPath + "/" + n).isFolder() == isFolder) {
result.add(n);
}
}
return result.toArray(new String[result.size()]);
}
}