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package bjc.utils.funcdata;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import bjc.utils.data.experimental.IPair;
/**
* Basic implementation of {@link IFunctionalMap}
*
* @author ben
*
* @param <K>
* The type of the map's keys
* @param <V>
* The type of the map's values
*/
public class FunctionalMap<K, V> implements IFunctionalMap<K, V> {
/**
* A map that transforms values from one type to another
*
* @author ben
*
* @param <K>
* The type of the map's keys
* @param <V>
* The type of the map's values
* @param <V2>
* The type of the transformed values
*/
private static final class TransformedValueMap<K, V, V2>
implements IFunctionalMap<K, V2> {
private IFunctionalMap<K, V> mapToTransform;
private Function<V, V2> transformer;
public TransformedValueMap(IFunctionalMap<K, V> destMap,
Function<V, V2> transform) {
mapToTransform = destMap;
transformer = transform;
}
@Override
public V2 get(K key) {
return transformer.apply(mapToTransform.get(key));
}
@Override
public boolean containsKey(K key) {
return mapToTransform.containsKey(key);
}
@Override
public String toString() {
return mapToTransform.toString();
}
@Override
public V2 put(K key, V2 val) {
throw new UnsupportedOperationException(
"Can't add items to transformed map");
}
@Override
public <V3> IFunctionalMap<K, V3> mapValues(
Function<V2, V3> transform) {
return new TransformedValueMap<>(this, transform);
}
@Override
public IFunctionalList<K> keyList() {
return mapToTransform.keyList();
}
@Override
public void forEach(BiConsumer<K, V2> action) {
mapToTransform.forEach((key, val) -> {
action.accept(key, transformer.apply(val));
});
}
@Override
public V2 remove(K key) {
return transformer.apply(mapToTransform.remove(key));
}
@Override
public int getSize() {
return mapToTransform.getSize();
}
@Override
public void forEachKey(Consumer<K> action) {
mapToTransform.forEachKey(action);
}
@Override
public void forEachValue(Consumer<V2> action) {
mapToTransform.forEachValue((val) -> {
action.accept(transformer.apply(val));
});
}
@Override
public IFunctionalList<V2> valueList() {
return mapToTransform.valueList().map(transformer);
}
}
private Map<K, V> wrappedMap;
/**
* Create a new blank functional map
*/
public FunctionalMap() {
wrappedMap = new HashMap<>();
}
/**
* Create a new functional map wrapping the specified map
*
* @param wrap
* The map to wrap
*/
public FunctionalMap(Map<K, V> wrap) {
if (wrap == null) {
throw new NullPointerException("Map to wrap must not be null");
}
wrappedMap = wrap;
}
/**
* Create a new functional map with the specified entries
*
* @param entries
* The entries to put into the map
*/
@SafeVarargs
public FunctionalMap(IPair<K, V>... entries) {
this();
for (IPair<K, V> entry : entries) {
entry.doWith((key, val) -> {
wrappedMap.put(key, val);
});
}
}
/*
* (non-Javadoc)
*
* @see bjc.utils.funcdata.IFunctionalMap#put(K, V)
*/
@Override
public V put(K key, V val) {
if (key == null) {
throw new NullPointerException("Key must not be null");
}
return wrappedMap.put(key, val);
}
/*
* (non-Javadoc)
*
* @see bjc.utils.funcdata.IFunctionalMap#get(K)
*/
@Override
public V get(K key) {
if (key == null) {
throw new NullPointerException("Key must not be null");
}
if (!wrappedMap.containsKey(key)) {
throw new IllegalArgumentException(
"Key " + key + " is not present in the map");
}
return wrappedMap.get(key);
}
/*
* (non-Javadoc)
*
* @see bjc.utils.funcdata.IFunctionalMap#mapValues(java.util.function.
* Function)
*/
@Override
public <V2> IFunctionalMap<K, V2> mapValues(
Function<V, V2> transformer) {
if (transformer == null) {
throw new NullPointerException("Transformer must not be null");
}
return new TransformedValueMap<>(this, transformer);
}
/*
* (non-Javadoc)
*
* @see bjc.utils.funcdata.IFunctionalMap#containsKey(K)
*/
@Override
public boolean containsKey(K key) {
return wrappedMap.containsKey(key);
}
@Override
public String toString() {
return wrappedMap.toString();
}
@Override
public IFunctionalList<K> keyList() {
FunctionalList<K> keys = new FunctionalList<>();
wrappedMap.keySet().forEach((key) -> {
keys.add(key);
});
return keys;
}
@Override
public void forEach(BiConsumer<K, V> action) {
wrappedMap.forEach(action);
}
@Override
public V remove(K key) {
return wrappedMap.remove(key);
}
@Override
public int getSize() {
return wrappedMap.size();
}
@Override
public void forEachKey(Consumer<K> action) {
wrappedMap.keySet().forEach(action);
}
@Override
public void forEachValue(Consumer<V> action) {
wrappedMap.values().forEach(action);
}
@Override
public IFunctionalList<V> valueList() {
FunctionalList<V> values = new FunctionalList<>();
wrappedMap.values().forEach((value) -> {
values.add(value);
});
return values;
}
}
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