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/*
 * Copyright (c) 2009. The Codehaus. All Rights Reserved.
 *
 *   Licensed 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.codehaus.httpcache4j.cache;

import org.codehaus.httpcache4j.util.StorageUtil;
import org.codehaus.httpcache4j.util.DeletingFileFilter;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.Validate;

import java.util.*;
import java.io.*;

/**
 * @author Erlend Hamnaberg
 * @version $Revision: #5 $ $Date: 2008/09/15 $
 */
final class FileManager implements Serializable {
    private final FileResolver fileResolver;
    private static final long serialVersionUID = -5273056780013227862L;
    private final File baseDirectory;

    public FileManager(final File baseDirectory) {
        Validate.notNull(baseDirectory, "Base directory may not be null");
        this.baseDirectory = baseDirectory;
        StorageUtil.ensureDirectoryExists(this.baseDirectory);
        File files = createFilesDirectory();
        this.fileResolver = new FileResolver(files);
    }

    private File createFilesDirectory() {
        File files = new File(baseDirectory, "files");
        StorageUtil.ensureDirectoryExists(files);
        return files;
    }

    File createFile(Key key, InputStream stream) throws IOException {
        File file = fileResolver.resolve(key);

        FileOutputStream outputStream = FileUtils.openOutputStream(file);
        try {
            IOUtils.copy(stream, outputStream);
        } finally {
            IOUtils.closeQuietly(outputStream);
        }
        if (file.length() == 0) {
            file.delete();
            file = null;
        }

        return file;
    }

    void clear() {
        baseDirectory.listFiles(new DeletingFileFilter());
        createFilesDirectory();
    }

}