fileloblocator.java

开源的axion的数据库代码

/*
 * $Id: FileLobLocator.java,v 1.2 2002/12/16 23:34:55 rwald Exp $
 * =======================================================================
 * Copyright (c) 2002 Axion Development Team.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the following
 *    disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The names "Tigris", "Axion", nor the names of its contributors may
 *    not be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. Products derived from this software may not be called "Axion", nor
 *    may "Tigris" or "Axion" appear in their names without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * =======================================================================
 */

package org.axiondb.types;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * A file-based {@link LobLocator}.
 * 
 * @version $Revision: 1.2 $ $Date: 2002/12/16 23:34:55 $
 * @author Rodney Waldhoff
 */
public class FileLobLocator implements LobLocator {
    public FileLobLocator(File file) {
        _directoryName = file.getParentFile().getName();
        _fileName = file.getName();
    }

    public FileLobLocator(String directory, String file) {
        _directoryName = directory;
        _fileName = file;
    }

    public String getDirectoryName() {
        return _directoryName;
    }

    public String getFileName() {
        return _fileName;
    }

    public File getFile(File parentDir) {
        return new File(new File(parentDir,_directoryName),_fileName);
    }

    public LobSource getLobSource(File parentDir, RandomAccessFile dataFile) {
        // XXX FIX ME XXX
        return new FileLobSource(getFile(parentDir));
    }

    public String toString() {
        StringBuffer buf = new StringBuffer();
        buf.append("dir=");
        buf.append(getDirectoryName());
        buf.append(";file=");
        buf.append(getFileName());
        return buf.toString();
    }

    public void write(DataOutput out) throws IOException {
        out.writeUTF(_directoryName);
        out.writeUTF(_fileName);
    }

    public LobLocator read(DataInput in) throws IOException {
        return new FileLobLocator(in.readUTF(),in.readUTF());
    }

    private transient String _directoryName = null;
    private transient String _fileName = null;
}