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233 lines (205 loc) · 4.73 KB
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package javaforce.db;
import java.io.*;
import java.util.*;
import javaforce.*;
import javaforce.io.*;
/** Tables store Row's in memory for fast access.
*
* @author pquiring
*/
public class Table<ROW extends Row> extends SerialObject {
private Row.Creator ctr;
@SuppressWarnings("unchecked")
private ROW create() {
return (ROW)ctr.newInstance();
}
public Table(Row.Creator rowCreator) {
ctr = rowCreator;
}
private ArrayList<ROW> rows = new ArrayList<ROW>();
private int minid = 1;
private int nextid = 1;
private int maxid = 2147483647; //2^31-1
private boolean reuseids = false;
public int id; //table id if in TableList (else free to use)
public String name; //user defined table name
public int xid; //user defined xref table id
protected transient String filename;
public boolean load(String filename) {
rows.clear();
this.filename = filename;
if (!new File(filename).exists()) {
return false;
}
try {
FileInputStream fis = new FileInputStream(filename);
ObjectReader ois = new ObjectReader(fis);
ois.readObject(this);
fis.close();
return true;
} catch (Exception e) {
JFLog.log(e);
return false;
}
}
public boolean save() {
try {
FileOutputStream fos = new FileOutputStream(filename);
ObjectWriter oos = new ObjectWriter(fos);
oos.writeObject(this);
fos.close();
return true;
} catch (Exception e) {
JFLog.log(e);
return false;
}
}
private int findIdx(ROW row) {
int cnt = rows.size();
if (cnt == 0) return 0;
int min = 0;
int idx = cnt / 2;
int max = cnt;
int tmp, delta;
while (true) {
if (idx == cnt) return idx;
ROW r = rows.get(idx);
switch (r.compare(row)) {
case 0: return idx;
case -1:
//r is lower : move towards max
if (idx == max) return idx;
tmp = idx;
delta = ((max - idx) / 2);
if (delta == 0) delta++;
idx += delta;
min = tmp;
break;
case 1:
//r is higher : move towards min
if (idx == min) return idx;
tmp = idx;
delta = ((idx - min) / 2);
if (delta == 0) delta++;
idx -= delta;
max = tmp;
break;
}
}
}
public synchronized void add(ROW row) {
if (reuseids) {
int id = minid;
int cnt = getCount();
for(int a=0;a<cnt;a++) {
ROW r = rows.get(a);
if (r.id == id) {
id++;
if (id == maxid) {
JFLog.log("Warning:Table is full!");
return;
}
a = -1;
}
}
row.id = id;
} else {
row.id = nextid++;
if (nextid == maxid) {
JFLog.log("Warning:Table id reset to start!");
nextid = minid;
}
}
row.timestamp = System.currentTimeMillis();
rows.add(findIdx(row), row);
}
public ROW get(int id) {
int size = rows.size();
for(int a=0;a<size;a++) {
ROW row = rows.get(a);
if (row.id == id) return row;
}
return null;
}
public void remove(int id) {
int size = rows.size();
for(int a=0;a<size;a++) {
ROW row = rows.get(a);
if (row.id == id) {
rows.remove(a);
break;
}
}
}
public void clear() {
rows.clear();
}
public ArrayList<ROW> getRows() {
return rows;
}
public int getCount() {
return rows.size();
}
public int getMinId() {
return minid;
}
public int getMaxId() {
return maxid;
}
public int getNextId() {
return nextid;
}
public void setMinId(int id) {
if (nextid < id) {
nextid = id;
}
minid = id;
}
public void setMaxId(int id) {
if (nextid > id) {
nextid = minid;
}
maxid = id;
}
public boolean getReuseIds() {
return reuseids;
}
public void setReuseIds(boolean state) {
reuseids = state;
}
private static final int version = 1;
public void readObject() throws Exception {
int ver = readInt();
minid = readInt();
nextid = readInt();
maxid = readInt();
reuseids = readBoolean();
id = readInt();
name = readString();
xid = readInt();
int cnt = readInt();
for(int a=0;a<cnt;a++) {
ROW row = create();
row.readInit(this);
row.readObject();
rows.add(row);
}
}
public void writeObject() throws Exception {
writeInt(version);
writeInt(minid);
writeInt(nextid);
writeInt(maxid);
writeBoolean(reuseids);
writeInt(id);
writeString(name);
writeInt(xid);
int cnt = rows.size();
writeInt(cnt);
for(int a=0;a<cnt;a++) {
ROW row = rows.get(a);
row.writeInit(this);
row.writeObject();
}
}
}