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Resize UnsafeList to initial capacity when cleared and implement clone.

Dieser Commit ist enthalten in:
Travis Watkins 2012-05-31 20:14:28 -05:00
Ursprung 894ea06567
Commit 70c91c161e

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@ -5,21 +5,22 @@ import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.AbstractList;
import java.util.Arrays;
import java.util.List;
import java.util.RandomAccess;
// implementation of an ArrayList that offers a getter without range checks
public class UnsafeList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, Serializable {
private static final long serialVersionUID = 8683452581112892189L;
private static final long serialVersionUID = 8683452581112892190L;
private transient Object[] data;
private int size;
private int initialCapacity;
public UnsafeList(int capacity) {
super();
if (capacity < 0) capacity = 128;
int rounded = Integer.highestOneBit(capacity - 1) << 1;
data = new Object[rounded];
initialCapacity = rounded;
}
public UnsafeList() {
@ -95,11 +96,9 @@ public class UnsafeList<E> extends AbstractList<E> implements List<E>, RandomAcc
}
public void clear() {
for (int i = 0; i < size; i++) {
data[i] = null;
}
// Create new array to reset memory usage to initial capacity
size = 0;
data = new Object[initialCapacity];
}
// actually rounds up to nearest power of two
@ -137,6 +136,7 @@ public class UnsafeList<E> extends AbstractList<E> implements List<E>, RandomAcc
os.defaultWriteObject();
os.writeInt(size);
os.writeInt(initialCapacity);
for (int i = 0; i < size; i++) {
os.writeObject(data[i]);
}
@ -146,9 +146,23 @@ public class UnsafeList<E> extends AbstractList<E> implements List<E>, RandomAcc
is.defaultReadObject();
size = is.readInt();
initialCapacity = is.readInt();
data = new Object[Integer.highestOneBit(size - 1) << 1];
for (int i = 0; i < size; i++) {
data[i] = is.readObject();
}
}
public UnsafeList<E> clone() {
try {
UnsafeList<E> copy = (UnsafeList<E>) super.clone();
copy.data = Java15Compat.Arrays_copyOf(data, size);
copy.size = size;
copy.initialCapacity = initialCapacity;
return copy;
} catch (CloneNotSupportedException ex) {
// This should never happen
return null;
}
}
}