public final class CyclicSerializableLinkedHashSet<T>
extends com.google.common.collect.ForwardingSet<T>
implements java.io.Serializable
LinkedHashSet that can be safely (de)serialized when involved in a reference cycle.
The motivating usecase of this class is the afformentioned cycles. Consider the following example:
class Foo implements Serializable {
private LinkedHashSet<Foo> children = new LinkedHashSet<>();
private Object hashSource = new Object();
public void addChild(Foo child) {
children.addChild(child);
}
{@literal @}Override
public int hashCode() {
return hashSouce.hashCode();
}
}
****
Foo f = new Foo();
f.addChild(f);
****
f were serialized and reserialized, there is a possiblity of exceptions via the
following steps. This class is designed to eliminate such issue.
f begins deserialization
f.children begins deserialization
f.children attempts to add f to itself
f.hashCode() is called
f.hashSource is null, throwing a NullPointerException
| Constructor and Description |
|---|
CyclicSerializableLinkedHashSet() |
| Modifier and Type | Method and Description |
|---|---|
protected java.util.Set<T> |
delegate() |
equals, hashCode, standardEquals, standardHashCode, standardRemoveAlladd, addAll, clear, contains, containsAll, isEmpty, iterator, remove, removeAll, retainAll, size, standardAddAll, standardClear, standardContains, standardContainsAll, standardIsEmpty, standardRemove, standardRetainAll, standardToArray, standardToArray, standardToString, toArray, toArrayclone, finalize, getClass, notify, notifyAll, wait, wait, waitCopyright © 2009-2018 Google. All Rights Reserved.