95 lines
2.2 KiB
Java
95 lines
2.2 KiB
Java
package it.cavallium.strangedb.lists;
|
|
|
|
import it.unimi.dsi.fastutil.longs.LongArrayList;
|
|
import it.cavallium.strangedb.EnhancedObject;
|
|
import it.cavallium.strangedb.database.IDatabaseTools;
|
|
|
|
import java.io.IOException;
|
|
import java.util.StringJoiner;
|
|
|
|
public abstract class StrandeDbList<T> extends EnhancedObject {
|
|
|
|
private final Object indicesAccessLock = new Object();
|
|
|
|
protected abstract LongArrayList getIndices();
|
|
|
|
public StrandeDbList() {
|
|
|
|
}
|
|
|
|
public StrandeDbList(IDatabaseTools databaseTools) throws IOException {
|
|
super(databaseTools);
|
|
}
|
|
|
|
public T get(int index) throws IOException {
|
|
synchronized (indicesAccessLock) {
|
|
long uid = getIndices().getLong(index);
|
|
return loadItem(uid);
|
|
}
|
|
}
|
|
|
|
public void add(T value) throws IOException {
|
|
long uid = databaseTools.getObjectsIO().newNullObject();
|
|
synchronized (indicesAccessLock) {
|
|
getIndices().add(uid);
|
|
writeItemToDisk(uid, value);
|
|
}
|
|
}
|
|
|
|
public void update(int index, T value) throws IOException {
|
|
synchronized (indicesAccessLock) {
|
|
long uid = getIndices().getLong(index);
|
|
writeItemToDisk(uid, value);
|
|
}
|
|
}
|
|
|
|
public void set(int index, T value) throws IOException {
|
|
long uid = databaseTools.getObjectsIO().newNullObject();
|
|
synchronized (indicesAccessLock) {
|
|
getIndices().set(index, uid);
|
|
writeItemToDisk(uid, value);
|
|
}
|
|
}
|
|
|
|
public void add(int index, T value) throws IOException {
|
|
long uid = databaseTools.getObjectsIO().newNullObject();
|
|
synchronized (indicesAccessLock) {
|
|
getIndices().add(index, uid);
|
|
writeItemToDisk(uid, value);
|
|
}
|
|
}
|
|
|
|
public T getLast() throws IOException {
|
|
synchronized (indicesAccessLock) {
|
|
if (getIndices().size() > 0) {
|
|
return get(getIndices().size() - 1);
|
|
} else {
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
|
|
public boolean isEmpty() {
|
|
synchronized (indicesAccessLock) {
|
|
return getIndices().size() <= 0;
|
|
}
|
|
}
|
|
|
|
public int size() {
|
|
synchronized (indicesAccessLock) {
|
|
return getIndices().size();
|
|
}
|
|
}
|
|
|
|
protected abstract T loadItem(long uid) throws IOException;
|
|
|
|
protected abstract void writeItemToDisk(long uid, T item) throws IOException;
|
|
|
|
@Override
|
|
public String toString() {
|
|
return new StringJoiner(", ", StrandeDbList.class.getSimpleName() + "[", "]")
|
|
.add(getIndices().size() + " items")
|
|
.toString();
|
|
}
|
|
}
|