/*
* Copyright 2004-2023 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://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 org.h2.engine.CastDataProvider;
import org.h2.message.DbException;
/**
* Implementation of NULL. NULL is not a regular data type.
*/
public final class ValueNull extends Value {
/**
* The main NULL instance.
*/
public static final ValueNull INSTANCE = new ValueNull();
/**
* The precision of NULL.
*/
static final int PRECISION = 1;
/**
* The display size of the textual representation of NULL.
*/
static final int DISPLAY_SIZE = 4;
private ValueNull() {
// don't allow construction
}
@Override
public StringBuilder getSQL(StringBuilder builder, int sqlFlags) {
return builder.append("NULL");
}
@Override
public TypeInfo getType() {
return TypeInfo.TYPE_NULL;
}
@Override
public int getValueType() {
return NULL;
}
@Override
public int getMemory() {
// Singleton value
return 0;
}
@Override
public String getString() {
return null;
}
@Override
public Reader getReader() {
return null;
}
@Override
public Reader getReader(long oneBasedOffset, long length) {
return null;
}
@Override
public byte[] getBytes() {
return null;
}
@Override
public InputStream getInputStream() {
return null;
}
@Override
public InputStream getInputStream(long oneBasedOffset, long length) {
return null;
}
@Override
public boolean getBoolean() {
throw DbException.getInternalError();
}
@Override
public byte getByte() {
throw DbException.getInternalError();
}
@Override
public short getShort() {
throw DbException.getInternalError();
}
@Override
public int getInt() {
throw DbException.getInternalError();
}
@Override
public long getLong() {
throw DbException.getInternalError();
}
@Override
public BigDecimal getBigDecimal() {
return null;
}
@Override
public float getFloat() {
throw DbException.getInternalError();
}
@Override
public double getDouble() {
throw DbException.getInternalError();
}
@Override
public int compareTypeSafe(Value v, CompareMode mode, CastDataProvider provider) {
throw DbException.getInternalError("compare null");
}
@Override
public boolean containsNull() {
return true;
}
@Override
public int hashCode() {
return 0;
}
@Override
public boolean equals(Object other) {
return other == this;
}
}