/*
* 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.result;
import org.h2.engine.Constants;
import org.h2.value.Value;
import org.h2.value.ValueBigint;
/**
* The default implementation of a row in a table.
*/
public class DefaultRow extends Row {
/**
* The constant that means "memory usage is unknown and needs to be calculated first".
*/
public static final int MEMORY_CALCULATE = -1;
/**
* The values of the row (one entry per column).
*/
protected final Value[] data;
private int memory;
DefaultRow(int columnCount) {
this.data = new Value[columnCount];
this.memory = MEMORY_CALCULATE;
}
public DefaultRow(Value[] data) {
this.data = data;
this.memory = MEMORY_CALCULATE;
}
public DefaultRow(Value[] data, int memory) {
this.data = data;
this.memory = memory;
}
@Override
public Value getValue(int i) {
return i == ROWID_INDEX ? ValueBigint.get(key) : data[i];
}
@Override
public void setValue(int i, Value v) {
if (i == ROWID_INDEX) {
key = v.getLong();
} else {
data[i] = v;
}
}
@Override
public int getColumnCount() {
return data.length;
}
@Override
public int getMemory() {
if (memory != MEMORY_CALCULATE) {
return memory;
}
return memory = calculateMemory();
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder("( /* key:").append(key).append(" */ ");
for (int i = 0, length = data.length; i < length; i++) {
if (i > 0) {
builder.append(", ");
}
Value v = data[i];
builder.append(v == null ? "null" : v.getTraceSQL());
}
return builder.append(')').toString();
}
/**
* Calculate the estimated memory used for this row, in bytes.
*
* @return the memory
*/
protected int calculateMemory() {
int m = Constants.MEMORY_ROW + Constants.MEMORY_ARRAY + data.length * Constants.MEMORY_POINTER;
for (Value v : data) {
if (v != null) {
m += v.getMemory();
}
}
return m;
}
@Override
public Value[] getValueList() {
return data;
}
@Override
public boolean hasSharedData(Row other) {
return other instanceof DefaultRow && data == ((DefaultRow) other).data;
}
@Override
public void copyFrom(SearchRow source) {
setKey(source.getKey());
for (int i = 0; i < getColumnCount(); i++) {
setValue(i, source.getValue(i));
}
}
}