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/*
* esodata - data structures and other things, of varying utility
* Copyright 2022, Ben Culkin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package bjc.funcdata;
import java.util.*;
import java.util.function.*;
/**
* An extended version of a map, that stores values into a map, but can look
* into a different one for others.
*
* @author Ben Culkin
*
* @param <KeyType>
* The type of the keys of the map.
*
* @param <ValueType>
* The type of the values of the map.
*/
class ExtendedMap<KeyType, ValueType> implements MapEx<KeyType, ValueType> {
/* The map we delegate lookups to. */
private final MapEx<KeyType, ValueType> delegate;
/* The map we store things in. */
private final MapEx<KeyType, ValueType> store;
private boolean isFrozen = false;
private boolean thawEnabled = true;
/**
* Create a new extended map.
*
* @param delegate
* The map to lookup things in.
*
* @param store
* The map to store things in.
*/
public ExtendedMap(final MapEx<KeyType, ValueType> delegate,
final MapEx<KeyType, ValueType> store) {
this.delegate = delegate;
this.store = store;
}
@Override
public void clear() {
if (isFrozen) return;
store.clear();
}
@Override
public boolean containsKey(final KeyType key) {
if (store.containsKey(key)) return true;
return delegate.containsKey(key);
}
@Override
public void forEach(final BiConsumer<KeyType, ValueType> action) {
store.forEach(action);
delegate.forEach(action);
}
@Override
public Optional<ValueType> get(final KeyType key) {
if (store.containsKey(key)) return store.get(key);
return delegate.get(key);
}
@Override
public int size() {
return store.size() + delegate.size();
}
@Override
public ListEx<KeyType> keyList() {
ListEx<KeyType> ilst = new FunctionalList<>();
ilst.addAll(store.keyList());
ilst.addAll(delegate.keyList());
return ilst;
}
@Override
public ValueType put(final KeyType key, final ValueType val) {
if (isFrozen)
throw new ObjectFrozen("Can't insert key " + key + " into frozen map");
return store.put(key, val);
}
@Override
public ValueType remove(final KeyType key) {
if (isFrozen)
throw new ObjectFrozen("Can't remove key " + key + " from frozen map");
if (!store.containsKey(key)) return delegate.remove(key);
return store.remove(key);
}
@Override
public int hashCode() {
// isFrozen isn't counted
return Objects.hash(delegate, store);
}
/* Misc. object support. */
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (getClass() != obj.getClass()) return false;
ExtendedMap<?, ?> other = (ExtendedMap<?, ?>) obj;
// isFrozen isn't counted
return Objects.equals(delegate, other.delegate) && Objects.equals(store, other.store);
}
@Override
public String toString() {
return String.format("ExtendedMap [delegate=%s, store=%s]", delegate, store);
}
/* IFreezable support */
@Override
public boolean freeze() {
isFrozen = true;
return true;
}
@Override
public boolean deepFreeze() {
thawEnabled = false;
return freeze();
}
@Override
public boolean thaw() {
if (thawEnabled) {
isFrozen = false;
return true;
}
return false;
}
@Override
public boolean isFrozen() {
return isFrozen;
}
@Override
public boolean canFreeze() {
return true;
}
@Override
public boolean canThaw() {
return thawEnabled;
}
}
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