junrar.vfs2.provider.rar.RARFileObject.java Source code

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Here is the source code for junrar.vfs2.provider.rar.RARFileObject.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 junrar.vfs2.provider.rar;

import java.io.InputStream;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileType;
import org.apache.commons.vfs2.provider.AbstractFileName;
import org.apache.commons.vfs2.provider.AbstractFileObject;

import junrar.Archive;
import junrar.rarfile.FileHeader;

/**
 * A file in a RAR file system.
 * 
 * @author <a href="http://www.rogiel.com">Rogiel</a>
 */
public class RARFileObject extends AbstractFileObject<RARFileSystem> implements FileObject {
    /**
     * The TFile.
     */
    protected Archive archive;
    protected FileHeader header;
    @SuppressWarnings("unused")
    private final RARFileSystem fs;

    private final Set<String> children = new HashSet<String>();

    protected RARFileObject(AbstractFileName name, Archive archive, FileHeader header, RARFileSystem fs)
            throws FileSystemException {
        super(name, fs);
        this.fs = fs;
        this.archive = archive;
        this.header = header;
        archive.getMainHeader().isFirstVolume();
    }

    @Override
    public boolean doIsWriteable() throws FileSystemException {
        return false;
    }

    @Override
    protected FileType doGetType() {
        if (header == null || header.isDirectory()) {
            return FileType.FOLDER;
        } else {
            return FileType.FILE;
        }
    }

    @Override
    protected String[] doListChildren() {
        try {
            if (!getType().hasChildren()) {
                return null;
            }
        } catch (FileSystemException e) {
            // should not happen as the type has already been cached.
            throw new RuntimeException(e);
        }
        return children.toArray(new String[children.size()]);
    }

    @Override
    protected long doGetContentSize() {
        return header.getFullUnpackSize();
    }

    @Override
    protected long doGetLastModifiedTime() throws Exception {
        return header.getMTime().getTime();
    }

    @Override
    protected InputStream doGetInputStream() throws Exception {
        if (!getType().hasContent()) {
            throw new FileSystemException("vfs.provider/read-not-file.error", getName());
        }
        return archive.getInputStream(header);
    }

    /**
     * Attaches a child.
     * 
     * @param childName
     *            The name of the child.
     */
    public void attachChild(FileName childName) {
        children.add(childName.getBaseName());
    }

    /**
     * @param header
     */
    public void setHeader(FileHeader header) {
        this.header = header;
    }
}