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package bjc.utils.funcdata;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import bjc.utils.funcutils.ListUtils;
/**
* 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 IMap<KeyType, ValueType> {
/* The map we delegate lookups to. */
private final IMap<KeyType, ValueType> delegate;
/* The map we store things in. */
private final IMap<KeyType, ValueType> store;
/**
* Create a new extended map.
*
* @param delegate
* The map to lookup things in.
*
* @param store
* The map to store things in.
*/
public ExtendedMap(final IMap<KeyType, ValueType> delegate, final IMap<KeyType, ValueType> store) {
this.delegate = delegate;
this.store = store;
}
@Override
public void clear() {
store.clear();
}
@Override
public boolean containsKey(final KeyType key) {
if (store.containsKey(key)) return true;
return delegate.containsKey(key);
}
@Override
public IMap<KeyType, ValueType> extend() {
return new ExtendedMap<>(this, new FunctionalMap<>());
}
@Override
public void forEach(final BiConsumer<KeyType, ValueType> action) {
store.forEach(action);
delegate.forEach(action);
}
@Override
public void forEachKey(final Consumer<KeyType> action) {
store.forEachKey(action);
delegate.forEachKey(action);
}
@Override
public void forEachValue(final Consumer<ValueType> action) {
store.forEachValue(action);
delegate.forEachValue(action);
}
@Override
public 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 IList<KeyType> keyList() {
return ListUtils.mergeLists(store.keyList(), delegate.keyList());
}
@Override
public <MappedValue> IMap<KeyType, MappedValue> transform(final Function<ValueType, MappedValue> transformer) {
return new TransformedValueMap<>(this, transformer);
}
@Override
public ValueType put(final KeyType key, final ValueType val) {
return store.put(key, val);
}
@Override
public ValueType remove(final KeyType key) {
if (!store.containsKey(key)) return delegate.remove(key);
return store.remove(key);
}
@Override
public IList<ValueType> valueList() {
return ListUtils.mergeLists(store.valueList(), delegate.valueList());
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + (delegate == null ? 0 : delegate.hashCode());
result = prime * result + (store == null ? 0 : store.hashCode());
return result;
}
@Override
public boolean equals(final Object obj) {
if (this == obj) return true;
if (obj == null) return false;
if (!(obj instanceof ExtendedMap)) return false;
final ExtendedMap<?, ?> other = (ExtendedMap<?, ?>) obj;
if (delegate == null) {
if (other.delegate != null) return false;
} else if (!delegate.equals(other.delegate)) return false;
if (store == null) {
if (other.store != null) return false;
} else if (!store.equals(other.store)) return false;
return true;
}
@Override
public String toString() {
return String.format("ExtendedMap [delegate=%s, store=%s]", delegate, store);
}
}
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