SimpleClob.java

package org.nutz.dao.util.blob;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;
import java.io.Reader;
import java.io.Writer;
import java.sql.Clob;
import java.sql.SQLException;

import org.nutz.lang.Files;
import org.nutz.lang.Lang;
import org.nutz.lang.Streams;

public class SimpleClob implements Clob {

    private File file;

    public SimpleClob(File f) {
        this.file = f;
    }

    public long length() throws SQLException {
        return file.length();
    }

    public String getSubString(long pos, int length) throws SQLException {
        if (pos < 1)
            throw new SQLException("pos<1");
        pos--;
        String str = Files.read(file);
        if (pos >= length)
            throw new IllegalArgumentException("pos="+pos);
        if (pos + length >= length())
            return str.substring((int)pos);
        return str.substring((int)pos, (int)(pos + length - 1));
    }

    public Reader getCharacterStream() throws SQLException {
        return Streams.fileInr(file);
    }

    public InputStream getAsciiStream() throws SQLException {
        return Streams.buff(Streams.fileIn(file));
    }

    public long position(String searchstr, long start) throws SQLException {
        throw Lang.noImplement();
    }

    public long position(Clob searchstr, long start) throws SQLException {
        throw Lang.noImplement();
    }

    public int setString(long pos, String str) throws SQLException {
        throw Lang.noImplement();
    }

    public int setString(long pos, String str, int offset, int len) throws SQLException {
        throw Lang.noImplement();
    }

    public OutputStream setAsciiStream(long pos) throws SQLException {
        throw Lang.noImplement();
    }

    public Writer setCharacterStream(long pos) throws SQLException {
        throw Lang.noImplement();
    }

    public void truncate(long len) throws SQLException {
        try {
            new RandomAccessFile(file, "rw").setLength(len);
        }
        catch (FileNotFoundException e) {
            throw Lang.wrapThrow(e);
        }
        catch (IOException e) {
            throw Lang.wrapThrow(e);
        }
    }

    public void free() throws SQLException {
        Files.deleteFile(file);
    }

    public Reader getCharacterStream(long pos, long length) throws SQLException {
        throw Lang.noImplement();
    }

}