com.mysql.cj.core.io.StringValueFactory Maven / Gradle / Ivy

/*
  Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  , like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FOSS License Exception
  .

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA

 */

package com.mysql.cj.core.io;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;

import com.mysql.cj.api.io.ValueFactory;
import com.mysql.cj.core.util.StringUtils;

/**
 * A {@link com.mysql.cj.api.io.ValueFactory} implementation to create strings.
 */
public class StringValueFactory implements ValueFactory {
    private String encoding;

    public StringValueFactory() {
    }

    public StringValueFactory(String encoding) {
        this.encoding = encoding;
    }

    /**
     * Create a string from date fields. The fields are formatted in a YYYY-mm-dd format. A point-in-time is not calculated.
     */
    public String createFromDate(int year, int month, int day) {
        // essentially the same string we received from the server, no TZ interpretation
        return String.format("%04d-%02d-%02d", year, month, day);
    }

    /**
     * Create a string from time fields. The fields are formatted in a HH:MM:SS[.nnnnnnnnn] format. A point-in-time is not calculated.
     */
    public String createFromTime(int hours, int minutes, int seconds, int nanos) {
        if (nanos > 0) {
            return String.format("%02d:%02d:%02d.%09d", hours, minutes, seconds, nanos);
        }
        return String.format("%02d:%02d:%02d", hours, minutes, seconds);
    }

    /**
     * Create a string from time fields. The fields are formatted by concatening the result of {@link createFromDate(int,int,int)} and {@link
     * createFromTime(int,int,int,int)}. A point-in-time is not calculated.
     */
    public String createFromTimestamp(int year, int month, int day, int hours, int minutes, int seconds, int nanos) {
        return String.format("%s %s", createFromDate(year, month, day), createFromTime(hours, minutes, seconds, nanos));
    }

    public String createFromLong(long l) {
        return String.valueOf(l);
    }

    public String createFromBigInteger(BigInteger i) {
        return i.toString();
    }

    public String createFromDouble(double d) {
        return String.valueOf(d);
    }

    public String createFromBigDecimal(BigDecimal d) {
        return d.toString();
    }

    /**
     * Interpret the given byte array as a string. This value factory needs to know the encoding to interpret the string. The default (null) will interpet the
     * byte array using the platform encoding.
     */
    public String createFromBytes(byte[] bytes, int offset, int length) {
        return StringUtils.toString(bytes, offset, length, this.encoding);
    }

    @Override
    public String createFromBit(byte[] bytes, int offset, int length) {
        // BIT values are interpreted as numbers, not as character codes
        return new BigInteger(ByteBuffer.allocate(length + 1).put((byte) 0).put(bytes, offset, length).array()).toString();
    }

    public String createFromNull() {
        return null;
    }

    public String getTargetTypeName() {
        return String.class.getName();
    }
}