studio.raptor.sqlparser.fast.value.ValueNull Maven / Gradle / Ivy

Go to download
/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package studio.raptor.sqlparser.fast.value;

import java.io.InputStream;
import java.io.Reader;
import java.math.BigDecimal;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Time;
import java.sql.Timestamp;
import studio.raptor.sqlparser.fast.message.ParseException;

/**
 * Implementation of NULL. NULL is not a regular data type.
 */
public class ValueNull extends Value {

  /**
   * The main NULL instance.
   */
  public static final ValueNull INSTANCE = new ValueNull();

  /**
   * This special instance is used as a marker for deleted entries in a map.
   * It should not be used anywhere else.
   */
  public static final ValueNull DELETED = new ValueNull();

  /**
   * The precision of NULL.
   */
  private static final int PRECISION = 1;

  /**
   * The display size of the textual representation of NULL.
   */
  private static final int DISPLAY_SIZE = 4;

  private ValueNull() {
    // don't allow construction
  }

  @Override
  public String getSQL() {
    return "NULL";
  }

  @Override
  public int getType() {
    return NULL;
  }

  @Override
  public String getString() {
    return null;
  }

  @Override
  public Boolean getBoolean() {
    return null;
  }

  @Override
  public Date getDate() {
    return null;
  }

  @Override
  public Time getTime() {
    return null;
  }

  @Override
  public Timestamp getTimestamp() {
    return null;
  }

  @Override
  public byte[] getBytes() {
    return null;
  }

  @Override
  public byte getByte() {
    return 0;
  }

  @Override
  public short getShort() {
    return 0;
  }

  @Override
  public BigDecimal getBigDecimal() {
    return null;
  }

  @Override
  public double getDouble() {
    return 0.0;
  }

  @Override
  public float getFloat() {
    return 0.0F;
  }

  @Override
  public int getInt() {
    return 0;
  }

  @Override
  public long getLong() {
    return 0;
  }

  @Override
  public InputStream getInputStream() {
    return null;
  }

  @Override
  public Reader getReader() {
    return null;
  }

  @Override
  public Value convertTo(int type) {
    return this;
  }

  @Override
  protected int compareSecure(Value v, CompareMode mode) {
    throw ParseException.throwInternalError("compare null");
  }

  @Override
  public long getPrecision() {
    return PRECISION;
  }

  @Override
  public int hashCode() {
    return 0;
  }

  @Override
  public Object getObject() {
    return null;
  }

  @Override
  public void set(PreparedStatement prep, int parameterIndex)
      throws SQLException {
    prep.setNull(parameterIndex, DataType.convertTypeToSQLType(NULL));
  }

  @Override
  public int getDisplaySize() {
    return DISPLAY_SIZE;
  }

  @Override
  public boolean equals(Object other) {
    return other == this;
  }

}