/*
* Copyright 2004-2018 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 org.h2.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 org.h2.engine.Mode;
import org.h2.message.DbException;
/**
* Implementation of NULL. NULL is not a regular data type.
*/
public class ValueNull extends Value {
/**
* The main NULL instance.
*/
public static final ValueNullINSTANCE = 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 ValueNullDELETED = 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 StringgetSQL() {
return "NULL";
}
@Override
public int getType() {
return Value.NULL;
}
@Override
public StringgetString() {
return null;
}
@Override
public boolean getBoolean() {
return false;
}
@Override
public DategetDate() {
return null;
}
@Override
public TimegetTime() {
return null;
}
@Override
public TimestampgetTimestamp() {
return null;
}
@Override
public byte[] getBytes() {
return null;
}
@Override
public byte getByte() {
return 0;
}
@Override
public short getShort() {
return 0;
}
@Override
public BigDecimalgetBigDecimal() {
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 InputStreamgetInputStream() {
return null;
}
@Override
public ReadergetReader() {
return null;
}
@Override
public ValueconvertTo(int type, int precision, Modemode, Objectcolumn, String[] enumerators) {
return this;
}
@Override
protected int compareSecure(Valuev, CompareModemode) {
throw DbException.throwInternalError("compare null");
}
@Override
public long getPrecision() {
return PRECISION;
}
@Override
public int hashCode() {
return 0;
}
@Override
public ObjectgetObject() {
return null;
}
@Override
public void set(PreparedStatementprep, int parameterIndex)
throws SQLException {
prep.setNull(parameterIndex, DataType.convertTypeToSQLType(Value.NULL));
}
@Override
public int getDisplaySize() {
return DISPLAY_SIZE;
}
@Override
public boolean equals(Objectother) {
return other == this;
}
}