org.apache.commons.vfs.provider.tar.TarFileProvider.java Source code

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Here is the source code for org.apache.commons.vfs.provider.tar.TarFileProvider.java

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/*
 * 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.commons.vfs.provider.tar;

import org.apache.commons.vfs.Capability;
import org.apache.commons.vfs.FileName;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.FileSystem;
import org.apache.commons.vfs.FileSystemException;
import org.apache.commons.vfs.FileSystemOptions;
import org.apache.commons.vfs.FileType;
import org.apache.commons.vfs.provider.AbstractLayeredFileProvider;
import org.apache.commons.vfs.provider.FileProvider;
import org.apache.commons.vfs.provider.LayeredFileName;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;

/**
 * A file system provider for Tar files.  Provides read-only file systems.
 */
public class TarFileProvider extends AbstractLayeredFileProvider implements FileProvider {
    protected final static Collection capabilities = Collections.unmodifiableCollection(
            Arrays.asList(new Capability[] { Capability.GET_LAST_MODIFIED, Capability.GET_TYPE,
                    Capability.LIST_CHILDREN, Capability.READ_CONTENT, Capability.URI, Capability.VIRTUAL }));

    public TarFileProvider() {
        super();
    }

    /**
     * Creates a layered file system.  This method is called if the file system
     * is not cached.
     *
     * @param scheme The URI scheme.
     * @param file   The file to create the file system on top of.
     * @return The file system.
     */
    protected FileSystem doCreateFileSystem(final String scheme, final FileObject file,
            final FileSystemOptions fileSystemOptions) throws FileSystemException {
        final FileName rootName = new LayeredFileName(scheme, file.getName(), FileName.ROOT_PATH, FileType.FOLDER);
        return new TarFileSystem(rootName, file, fileSystemOptions);
    }

    public Collection getCapabilities() {
        return capabilities;
    }
}