package org.apache.maven.index.reader;
/*
* 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.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* A trivial {@link File} directory handler that does not perform any locking or extra bits, and just serves up files
* by name from specified existing directory.
*/
public class DirectoryResourceHandler
implements WritableResourceHandler
{
private final File rootDirectory;
public DirectoryResourceHandler(final File rootDirectory) {
if (rootDirectory == null) {
throw new NullPointerException("null rootDirectory");
}
if (!rootDirectory.isDirectory()) {
throw new IllegalArgumentException("rootDirectory exists and is not a directory");
}
this.rootDirectory = rootDirectory;
}
public File getRootDirectory() {
return rootDirectory;
}
public WritableResource locate(final String name) throws IOException {
return new FileResource(new File(rootDirectory, name));
}
public void close() throws IOException {
// nop
}
private class FileResource
implements WritableResource
{
private final File file;
private FileResource(final File file) {
this.file = file;
}
public InputStream read() throws IOException {
if (file.isFile()) {
return new BufferedInputStream(new FileInputStream(file));
}
return null;
}
public OutputStream write() throws IOException {
return new BufferedOutputStream(new FileOutputStream(file));
}
public void close() throws IOException {
// nop
}
}
}