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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.*;
import bjc.data.*;
/**
* Basic implementation of {@link MapEx}
*
* @author ben
*
* @param <KeyType>
* The type of the map's keys.
*
* @param <ValueType>
* The type of the map's values.
*/
public class FunctionalMap<KeyType, ValueType> implements MapEx<KeyType, ValueType> {
/* Our backing store. */
private Map<KeyType, ValueType> wrappedMap;
private boolean isFrozen = false;
private boolean thawEnabled = true;
/** Create a new blank functional map */
public FunctionalMap() {
wrappedMap = new HashMap<>();
}
/**
* Create a new functional map with the specified entries.
*
* @param entries
* The entries to put into the map.
*/
@SafeVarargs
public FunctionalMap(final Pair<KeyType, ValueType>... entries) {
this();
for (final Pair<KeyType, ValueType> entry : entries) {
entry.doWith(wrappedMap::put);
}
}
/**
* Create a new functional map wrapping the specified map.
*
* @param wrap
* The map to wrap.
*/
public FunctionalMap(final Map<KeyType, ValueType> wrap) {
if (wrap == null) throw new NullPointerException("Map to wrap must not be null");
wrappedMap = wrap;
}
@Override
public void clear() {
if (isFrozen) throw new ObjectFrozen("Can't clear frozen map");
wrappedMap.clear();
}
@Override
public boolean containsKey(final KeyType key) {
return wrappedMap.containsKey(key);
}
@Override
public void forEach(final BiConsumer<KeyType, ValueType> action) {
wrappedMap.forEach(action);
}
@Override
public Optional<ValueType> get(final KeyType key) {
if (key == null) throw new NullPointerException("Key must not be null");
if (wrappedMap.containsKey(key)) {
return Optional.of(wrappedMap.get(key));
} else {
return Optional.empty();
}
}
@Override
public int size() {
return wrappedMap.size();
}
@Override
public ListEx<KeyType> keyList() {
final FunctionalList<KeyType> keys = new FunctionalList<>();
wrappedMap.keySet().forEach(keys::add);
return keys;
}
@Override
public ValueType put(final KeyType key, final ValueType val) {
if (isFrozen) throw new ObjectFrozen("Can't put key " + key + " into frozen map");
if (key == null) throw new NullPointerException("Key must not be null");
return wrappedMap.put(key, val);
}
@Override
public ValueType remove(final KeyType key) {
if (isFrozen) throw new ObjectFrozen("Can't remove key " + key + " from frozen map");
return wrappedMap.remove(key);
}
@Override
public String toString() {
return wrappedMap.toString();
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (wrappedMap == null ? 0 : wrappedMap.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (!(obj instanceof FunctionalMap)) return false;
final FunctionalMap<?, ?> other = (FunctionalMap<?, ?>) obj;
if (wrappedMap == null) {
if (other.wrappedMap != null) return false;
} else if (!wrappedMap.equals(other.wrappedMap)) {
return false;
}
return true;
}
// IFreezable support
@Override
public boolean freeze() {
isFrozen = true;
return true;
}
@Override
public boolean thaw() {
if (thawEnabled) {
isFrozen = false;
return true;
} else {
return false;
}
}
@Override
public boolean deepFreeze() {
thawEnabled = false;
return freeze();
}
@Override
public boolean canFreeze() {
return true;
}
@Override
public boolean canThaw() {
return thawEnabled;
}
@Override
public boolean isFrozen() {
return isFrozen;
}
}
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