/*
* Copyright 2004-2013 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.lealone.result;
import org.lealone.constant.Constants;
import org.lealone.store.Data;
import org.lealone.util.StatementBuilder;
import org.lealone.value.Value;
import org.lealone.value.ValueLong;
/**
* Represents a row in a table.
*/
public class Row implements SearchRow {
public static final int MEMORY_CALCULATE = -1;
public static final Row[] EMPTY_ARRAY = {};
private long key;
private final Value[] data;
private int memory;
private int version;
private boolean deleted;
private int sessionId;
private Value rowKey;
private long transactionId = -1;
public Value getRowKey() {
return rowKey;
}
public void setRowKey(Value rowKey) {
this.rowKey = rowKey;
}
public long getTransactionId() {
return transactionId;
}
public void setTransactionId(long transactionId) {
this.transactionId = transactionId;
}
public Row(Value[] data, int memory) {
this.data = data;
this.memory = memory;
}
public Row(Value rowKey, Value[] data, int memory) {
this.rowKey = rowKey;
this.data = data;
this.memory = memory;
}
/**
* Get a copy of the row that is distinct from (not equal to) this row.
* This is used for FOR UPDATE to allow pseudo-updating a row.
*
* @return a new row with the same data
*/
public Row getCopy() {
Value[] d2 = new Value[data.length];
System.arraycopy(data, 0, d2, 0, data.length);
Row r2 = new Row(d2, memory);
r2.key = key;
r2.version = version + 1;
r2.sessionId = sessionId;
return r2;
}
public void setKeyAndVersion(SearchRow row) {
setKey(row.getKey());
setVersion(row.getVersion());
}
public int getVersion() {
return version;
}
public void setVersion(int version) {
this.version = version;
}
public long getKey() {
return key;
}
public void setKey(long key) {
this.key = key;
}
public Value getValue(int i) {
return i == -1 ? ValueLong.get(key) : (i == -2 ? rowKey : data[i]);
}
/**
* Get the number of bytes required for the data.
*
* @param dummy the template buffer
* @return the number of bytes
*/
public int getByteCount(Data dummy) {
int size = 0;
for (Value v : data) {
size += dummy.getValueLen(v);
}
return size;
}
public void setValue(int i, Value v) {
if (i == -1) {
this.key = v.getLong();
} else if (i == -2) {
this.rowKey = v;
} else {
data[i] = v;
}
}
public boolean isEmpty() {
return data == null;
}
public int getColumnCount() {
return data.length;
}
public int getMemory() {
if (memory != MEMORY_CALCULATE) {
return memory;
}
int m = Constants.MEMORY_ROW;
if (data != null) {
int len = data.length;
m += Constants.MEMORY_OBJECT + len * Constants.MEMORY_POINTER;
for (int i = 0; i < len; i++) {
Value v = data[i];
if (v != null) {
m += v.getMemory();
}
}
}
this.memory = m;
return m;
}
public String toString() {
StatementBuilder buff = new StatementBuilder("( /* key:");
buff.append(getKey());
if (version != 0) {
buff.append(" v:" + version);
}
if (isDeleted()) {
buff.append(" deleted");
}
buff.append(" */ ");
if (data != null) {
for (Value v : data) {
buff.appendExceptFirst(", ");
buff.append(v == null ? "null" : v.getTraceSQL());
}
}
return buff.append(')').toString();
}
public void setDeleted(boolean deleted) {
this.deleted = deleted;
}
public void setSessionId(int sessionId) {
this.sessionId = sessionId;
}
public int getSessionId() {
return sessionId;
}
/**
* This record has been committed. The session id is reset.
*/
public void commit() {
this.sessionId = 0;
}
public boolean isDeleted() {
return deleted;
}
public Value[] getValueList() {
return data;
}
}