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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.collections;
import java.util.Collection;
import java.util.List;
/**
* An array list which can be frozen to disallow further edits.
* After freezing, edit operations will throw UnsupportedOperationException.
* Freezable lists may optionally allow new items to be added to the end of the list also after freeze.
*
* @author bratseth
*/
public class FreezableArrayList<ITEM> extends ListenableArrayList<ITEM> {
private static final long serialVersionUID = 5900452593651895638L;
private final boolean permitAddAfterFreeze;
private boolean frozen = false;
/** Creates a freezable array list which does not permit adds after freeze */
public FreezableArrayList() {
this(false);
}
/** Creates a freezable array list which does not permit adds after freeze */
public FreezableArrayList(int initialCapacity) {
this(false, initialCapacity);
}
public FreezableArrayList(boolean permitAddAfterFreeze) {
this.permitAddAfterFreeze = permitAddAfterFreeze;
}
public FreezableArrayList(boolean permitAddAfterFreeze, int initialCapacity) {
super(initialCapacity);
this.permitAddAfterFreeze = permitAddAfterFreeze;
}
/** Irreversibly freezes the content of this */
public void freeze() {
this.frozen = true;
}
@Override
public boolean add(ITEM e) {
if ( ! permitAddAfterFreeze) throwIfFrozen();
return super.add(e);
}
@Override
public void add(int index, ITEM e) {
throwIfFrozen();
super.add(index, e);
}
@Override
public boolean addAll(Collection<? extends ITEM> a) {
if ( ! permitAddAfterFreeze) throwIfFrozen();
return super.addAll(a);
}
@Override
public boolean addAll(int index, Collection<? extends ITEM> a) {
throwIfFrozen();
return super.addAll(index, a);
}
@Override
public ITEM set(int index, ITEM e) {
throwIfFrozen();
return super.set(index, e);
}
@Override
public ITEM remove(int index) {
throwIfFrozen();
return super.remove(index);
}
@Override
public boolean remove(Object o) {
throwIfFrozen();
return super.remove(o);
}
@Override
public void clear() {
throwIfFrozen();
super.clear();
}
@Override
protected void removeRange(int fromIndex, int toIndex) {
throwIfFrozen();
super.removeRange(fromIndex, toIndex);
}
@Override
public boolean removeAll(Collection<?> c) {
throwIfFrozen();
return super.removeAll(c);
}
@Override
public boolean retainAll(Collection<?> c) {
throwIfFrozen();
return super.retainAll(c);
}
private void throwIfFrozen() {
if ( frozen )
throw new UnsupportedOperationException(this + " is frozen");
}
}
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