rowoutputtext.java

hsql是很有名的嵌入式数据库

/* Copyright (c) 2001-2005, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software 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 HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * 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.hsqldb.rowio;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;

import org.hsqldb.CachedRow;
import org.hsqldb.Trace;
import org.hsqldb.Types;
import org.hsqldb.lib.StringConverter;
import org.hsqldb.persist.TextCache;
import org.hsqldb.types.Binary;
import org.hsqldb.types.JavaObject;

/**
 *  Class for writing the data for a database row in text table format.
 *
 * @author sqlbob@users (RMP)
 * @version 1.8.0
 * @since 1.7.0
 */
public class RowOutputText extends RowOutputBase {

    protected String  fieldSep;
    protected String  varSep;
    protected String  longvarSep;
    private boolean   fieldSepEnd;
    private boolean   varSepEnd;
    private boolean   longvarSepEnd;
    private String    nextSep = "";
    private boolean   nextSepEnd;
    protected boolean allQuoted;
    private String    encoding;

    public RowOutputText(String fieldSep, String varSep, String longvarSep,
                         boolean allQuoted, String encoding) {

        super();

        initTextDatabaseRowOutput(fieldSep, varSep, longvarSep, allQuoted,
                                  encoding);
    }

    private void initTextDatabaseRowOutput(String fieldSep, String varSep,
                                           String longvarSep,
                                           boolean allQuoted,
                                           String encoding) {

        //-- Newline indicates that field should match to end of line.
        if (fieldSep.endsWith("\n")) {
            fieldSepEnd = true;
            fieldSep    = fieldSep.substring(0, fieldSep.length() - 1);
        }

        if (varSep.endsWith("\n")) {
            varSepEnd = true;
            varSep    = varSep.substring(0, varSep.length() - 1);
        }

        if (longvarSep.endsWith("\n")) {
            longvarSepEnd = true;
            longvarSep    = longvarSep.substring(0, longvarSep.length() - 1);
        }

        this.fieldSep   = fieldSep;
        this.varSep     = varSep;
        this.longvarSep = longvarSep;
        this.allQuoted  = allQuoted;
        this.encoding   = encoding;
    }

    public void writeEnd() {

        // terminate at the end of row
        if (nextSepEnd) {
            writeBytes(nextSep);
        }

        writeBytes(TextCache.NL);
    }

    public void writeSize(int size) {

        // initialise at the start of row
        nextSep    = "";
        nextSepEnd = false;
    }

    public void writeType(int type) {

        //--do Nothing
    }

    public void writeString(String s) {

        s = checkConvertString(s, fieldSep);

        // error
        if (s == null) {
            return;
        }

        // writeBytes(s);
        byte[] bytes = getBytes(s);

        write(bytes, 0, bytes.length);

        nextSep    = fieldSep;
        nextSepEnd = fieldSepEnd;
    }

    protected void writeVarString(String s) {

        s = checkConvertString(s, varSep);

        if (s == null) {
            return;
        }

        // writeBytes(s);
        byte[] bytes = getBytes(s);

        write(bytes, 0, bytes.length);

        nextSep    = varSep;
        nextSepEnd = varSepEnd;
    }

    protected void writeLongVarString(String s) {

        s = checkConvertString(s, longvarSep);

        if (s == null) {
            return;
        }

        // writeBytes(s);
        byte[] bytes = getBytes(s);

        write(bytes, 0, bytes.length);

        nextSep    = longvarSep;
        nextSepEnd = longvarSepEnd;
    }

    protected String checkConvertString(String s, String sep) {

        if (s.indexOf('\n') != -1 || s.indexOf('\r') != -1) {
            throw new IllegalArgumentException(
                Trace.getMessage(Trace.TEXT_STRING_HAS_NEWLINE));
        } else if (s.indexOf(sep) != -1) {
            return null;
        }

        return s;
    }

    private byte[] getBytes(String s) {

        byte[] bytes = null;

        try {
            bytes = s.getBytes(encoding);
        } catch (UnsupportedEncodingException e) {
            bytes = s.getBytes();
        }

        return bytes;
    }

    protected void writeByteArray(byte[] b) {

        ensureRoom(b.length * 2);
        StringConverter.writeHex(this.getBuffer(), count, b);

        count += b.length * 2;
    }

    public void writeShortData(short i) {
        writeIntData(i);
    }

    public void writeIntData(int i) {

        writeBytes(Integer.toString(i));

        nextSep    = fieldSep;
        nextSepEnd = fieldSepEnd;
    }

    public void writeIntData(int i, int position) {
        throw new java.lang.RuntimeException(
            Trace.getMessage(Trace.TextDatabaseRowOutput_writeIntData));
    }

    public void writeLongData(long i) {
        throw new RuntimeException();
    }

// fredt@users - comment - methods used for writing each SQL type
    protected void writeFieldType(int type) {

        writeBytes(nextSep);

        switch (type) {

            case Types.VARCHAR :
            case Types.VARCHAR_IGNORECASE :
                nextSep    = varSep;
                nextSepEnd = varSepEnd;
                break;

            case Types.LONGVARCHAR :
                nextSep    = longvarSep;
                nextSepEnd = longvarSepEnd;
                break;

            default :
                nextSep    = fieldSep;
                nextSepEnd = fieldSepEnd;
                break;
        }
    }

    protected void writeNull(int type) {
        writeFieldType(type);
    }

    protected void writeChar(String s, int t) {

        switch (t) {

            case Types.CHAR :
                writeString(s);

                return;

            case Types.VARCHAR :
            case Types.VARCHAR_IGNORECASE :
                writeVarString(s);

                return;

            case Types.LONGVARCHAR :
            default :
                writeLongVarString(s);

                return;
        }
    }

    protected void writeSmallint(Number o) {
        writeString(o.toString());
    }

    protected void writeInteger(Number o) {
        writeString(o.toString());
    }

    protected void writeBigint(Number o) {
        writeString(o.toString());
    }

    protected void writeReal(Double o, int type) {
        writeString(o.toString());
    }

    protected void writeDecimal(BigDecimal o) {
        writeString(o.toString());
    }

    protected void writeBit(Boolean o) {
        writeString(o.toString());
    }

    protected void writeDate(Date o) {
        writeString(o.toString());
    }

    protected void writeTime(Time o) {
        writeString(o.toString());
    }

    protected void writeTimestamp(Timestamp o) {
        writeString(o.toString());
    }

    protected void writeOther(JavaObject o) {

        byte[] ba = o.getBytes();

        writeByteArray(ba);
    }

    protected void writeBinary(Binary o, int t) {
        writeByteArray(o.getBytes());
    }

    public int getSize(CachedRow r) {

        reset();

        try {
            writeSize(0);
            writeData(r.getData(), r.getTable());
            writeEnd();
        } catch (Exception e) {
            reset();

//            throw (Trace.error(Trace.FILE_IO_ERROR, e.toString()));
        }

        int rowsize = size();

        reset();

        return rowsize;
    }
}