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package com.hubspot.jinjava.util;
import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.annotation.Nonnull;
public class ScopeMap<K, V> implements Map<K, V> {
private final Map<K, V> scope;
private final ScopeMap<K, V> parent;
public ScopeMap() {
this(null);
}
public ScopeMap(ScopeMap<K, V> parent) {
this.scope = new HashMap<>();
this.parent = parent;
}
public ScopeMap(ScopeMap<K, V> parent, Map<K, V> scope) {
this(parent);
this.scope.putAll(scope);
}
public ScopeMap<K, V> getParent() {
return parent;
}
public Map<K, V> getScope() {
return scope;
}
@Override
public int size() {
return keySet().size();
}
@Override
public boolean isEmpty() {
return size() == 0;
}
@Override
public boolean containsKey(Object key) {
return get(key) != null;
}
@Override
public boolean containsValue(Object value) {
if (scope.containsValue(value)) {
return true;
}
if (parent != null) {
return parent.containsValue(value);
}
return false;
}
public V get(Object key, V defVal) {
V val = get(key);
if (val != null) {
return val;
}
return defVal;
}
@Override
public V get(Object key) {
V val = scope.get(key);
if (val != null) {
return val;
}
if (parent != null) {
return parent.get(key);
}
return null;
}
@Override
public V put(K key, V value) {
if (value == this) {
throw new IllegalArgumentException(
String.format("attempt to put on map with key '%s' and value of itself", key)
);
}
return scope.put(key, value);
}
@Override
public boolean replace(K key, V oldValue, V newValue) {
boolean replaced = scope.replace(key, oldValue, newValue);
if (replaced) {
return true;
}
if (parent != null) {
return parent.replace(key, oldValue, newValue);
}
return false;
}
@Override
public V replace(K key, V value) {
V val = scope.replace(key, value);
if (val != null) {
return val;
}
if (parent != null) {
return parent.replace(key, value);
}
return null;
}
@Override
public V remove(Object key) {
return scope.remove(key);
}
@Override
public void putAll(@Nonnull Map<? extends K, ? extends V> m) {
for (Entry<? extends K, ? extends V> entry : m.entrySet()) {
if (entry.getValue() == this) {
throw new IllegalArgumentException(
String.format(
"attempt to putAll on map with key '%s' and value of itself",
entry.getKey()
)
);
}
}
scope.putAll(m);
}
@Override
public void clear() {
scope.clear();
}
@Override
@Nonnull
public Set<K> keySet() {
Set<K> keys = new HashSet<>();
if (parent != null) {
keys.addAll(parent.keySet());
}
keys.addAll(scope.keySet());
return keys;
}
@Override
@Nonnull
public Collection<V> values() {
Set<java.util.Map.Entry<K, V>> entrySet = entrySet();
Collection<V> values = new ArrayList<>(entrySet.size());
for (Map.Entry<K, V> entry : entrySet) {
values.add(entry.getValue());
}
return values;
}
@Override
@SuppressFBWarnings(
justification = "using overridden get() to do scoped retrieve with parent fallback",
value = "WMI_WRONG_MAP_ITERATOR"
)
@Nonnull
public Set<java.util.Map.Entry<K, V>> entrySet() {
Set<java.util.Map.Entry<K, V>> entries = new HashSet<>();
for (K key : keySet()) {
entries.add(new ScopeMapEntry<>(key, get(key), this));
}
return entries;
}
public static class ScopeMapEntry<K, V> implements Map.Entry<K, V> {
private final Map<K, V> map;
private final K key;
private V value;
public ScopeMapEntry(K key, V value, Map<K, V> map) {
this.key = key;
this.value = value;
this.map = map;
}
@Override
public K getKey() {
return key;
}
@Override
public V getValue() {
return value;
}
@Override
public V setValue(V value) {
this.value = value;
map.put(key, value);
return value;
}
}
}