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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.component.provider;
/**
* Convenience superclass of non-component freezables
*
* @author bratseth
*/
public class FreezableClass implements Freezable {
/** True when this cannot be changed any more */
private boolean frozen=false;
/**
* Freezes this class to prevent further changes. Override this to freeze internal data
* structures and dependent objects. Overrides must call super.
* Calling freeze on an already frozen registry must have no effect.
*/
public synchronized void freeze() {
frozen=true;
}
/** Returns whether this is currently frozen */
public final boolean isFrozen() { return frozen; }
/** Throws an IllegalStateException if this is frozen */
protected void ensureNotFrozen() {
if (frozen)
throw new IllegalStateException(this + " is frozen and cannot be modified");
}
/** Clones this. The clone is <i>not</i> frozen */
@Override
public FreezableClass clone() {
try {
FreezableClass clone=(FreezableClass)super.clone();
clone.frozen = false;
return clone;
}
catch (CloneNotSupportedException e) {
throw new RuntimeException(e);
}
}
}
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