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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.

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/*
 * Copyright 2015 Goldman Sachs.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gs.collections.impl.bimap.mutable;

import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import com.gs.collections.api.bag.MutableBag;
import com.gs.collections.api.bag.primitive.MutableBooleanBag;
import com.gs.collections.api.bag.primitive.MutableByteBag;
import com.gs.collections.api.bag.primitive.MutableCharBag;
import com.gs.collections.api.bag.primitive.MutableDoubleBag;
import com.gs.collections.api.bag.primitive.MutableFloatBag;
import com.gs.collections.api.bag.primitive.MutableIntBag;
import com.gs.collections.api.bag.primitive.MutableLongBag;
import com.gs.collections.api.bag.primitive.MutableShortBag;
import com.gs.collections.api.bimap.ImmutableBiMap;
import com.gs.collections.api.bimap.MutableBiMap;
import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.function.Function0;
import com.gs.collections.api.block.function.Function2;
import com.gs.collections.api.block.function.primitive.BooleanFunction;
import com.gs.collections.api.block.function.primitive.ByteFunction;
import com.gs.collections.api.block.function.primitive.CharFunction;
import com.gs.collections.api.block.function.primitive.DoubleFunction;
import com.gs.collections.api.block.function.primitive.FloatFunction;
import com.gs.collections.api.block.function.primitive.IntFunction;
import com.gs.collections.api.block.function.primitive.LongFunction;
import com.gs.collections.api.block.function.primitive.ShortFunction;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.set.MutableSetMultimap;
import com.gs.collections.api.partition.set.PartitionMutableSet;
import com.gs.collections.api.set.MutableSet;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.bimap.AbstractBiMap;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.block.procedure.CollectionAddProcedure;
import com.gs.collections.impl.block.procedure.PartitionProcedure;
import com.gs.collections.impl.block.procedure.SelectInstancesOfProcedure;
import com.gs.collections.impl.factory.BiMaps;
import com.gs.collections.impl.list.fixed.ArrayAdapter;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.multimap.set.UnifiedSetMultimap;
import com.gs.collections.impl.partition.set.PartitionUnifiedSet;
import com.gs.collections.impl.set.mutable.UnifiedSet;
import com.gs.collections.impl.utility.Iterate;
import com.gs.collections.impl.utility.MapIterate;

abstract class AbstractMutableBiMap extends AbstractBiMap implements MutableBiMap
{
    private UnifiedMap delegate;
    private AbstractMutableBiMap inverse;

    AbstractMutableBiMap(Map map)
    {
        this.delegate = UnifiedMap.newMap();
        this.inverse = new Inverse(UnifiedMap.newMap(), this);
        this.putAll(map);
    }

    AbstractMutableBiMap(Map delegate, Map inverse)
    {
        this.checkNull(delegate, inverse);
        this.checkSame(delegate, inverse);
        this.delegate = UnifiedMap.newMap(delegate);
        this.inverse = new Inverse(inverse, this);
    }

    private AbstractMutableBiMap(Map delegate, AbstractMutableBiMap valuesToKeys)
    {
        this.delegate = UnifiedMap.newMap(delegate);
        this.inverse = valuesToKeys;
    }

    private void checkNull(Map delegate, Map inverse)
    {
        if (delegate == null || inverse == null)
        {
            throw new IllegalArgumentException("The delegate maps cannot be null.");
        }
    }

    private void checkSame(Map keysToValues, Map valuesToKeys)
    {
        if (keysToValues == valuesToKeys)
        {
            throw new IllegalArgumentException("The delegate maps cannot be same.");
        }
    }

    private static boolean nullSafeEquals(Object value, Object other)
    {
        if (value == null)
        {
            if (other == null)
            {
                return true;
            }
        }
        else if (other == value || value.equals(other))
        {
            return true;
        }
        return false;
    }

    @Override
    protected UnifiedMap getDelegate()
    {
        return this.delegate;
    }

    @Override
    protected UnifiedMap getInverse()
    {
        return this.inverse.delegate;
    }

    public HashBiMap newEmpty()
    {
        return new HashBiMap();
    }

    public MutableBiMap withKeyValue(K key, V value)
    {
        this.put(key, value);
        return this;
    }

    public MutableBiMap withAllKeyValues(Iterable> keyValues)
    {
        for (Pair keyVal : keyValues)
        {
            this.put(keyVal.getOne(), keyVal.getTwo());
        }
        return this;
    }

    public MutableBiMap withAllKeyValueArguments(Pair... keyValuePairs)
    {
        return this.withAllKeyValues(ArrayAdapter.adapt(keyValuePairs));
    }

    public MutableBiMap withoutKey(K key)
    {
        this.removeKey(key);
        return this;
    }

    public MutableBiMap withoutAllKeys(Iterable keys)
    {
        for (K key : keys)
        {
            this.removeKey(key);
        }
        return this;
    }

    public MutableBiMap inverse()
    {
        return this.inverse;
    }

    public MutableSetMultimap flip()
    {
        // TODO: We could optimize this since we know the values are unique
        return MapIterate.flip(this);
    }

    public MutableBiMap flipUniqueValues()
    {
        return new HashBiMap(this.inverse());
    }

    public V put(K key, V value)
    {
        if (this.inverse.delegate.containsKey(value))
        {
            if (AbstractMutableBiMap.nullSafeEquals(key, this.inverse.delegate.get(value)))
            {
                return value;
            }
            throw new IllegalArgumentException("Value " + value + " already exists in map!");
        }

        boolean containsKey = this.delegate.containsKey(key);
        V put = this.delegate.put(key, value);
        if (containsKey)
        {
            this.inverse.delegate.removeKey(put);
        }
        this.inverse.delegate.put(value, key);
        return put;
    }

    public V forcePut(K key, V value)
    {
        boolean containsValue = this.inverse.delegate.containsKey(value);
        if (containsValue)
        {
            if (AbstractMutableBiMap.nullSafeEquals(key, this.inverse.delegate.get(value)))
            {
                return value;
            }
        }

        boolean containsKey = this.delegate.containsKey(key);
        V put = this.delegate.put(key, value);
        if (containsKey)
        {
            this.inverse.delegate.removeKey(put);
        }
        K oldKey = this.inverse.delegate.put(value, key);
        if (containsValue)
        {
            this.delegate.removeKey(oldKey);
        }
        return put;
    }

    public void putAll(Map map)
    {
        Set> entries = map.entrySet();
        for (Map.Entry entry : entries)
        {
            this.put(entry.getKey(), entry.getValue());
        }
    }

    public V add(Pair keyValuePair)
    {
        return this.put(keyValuePair.getOne(), keyValuePair.getTwo());
    }

    public V remove(Object key)
    {
        if (!this.delegate.containsKey(key))
        {
            return null;
        }
        V oldValue = this.delegate.remove(key);
        this.inverse.delegate.remove(oldValue);
        return oldValue;
    }

    public V removeKey(K key)
    {
        return this.remove(key);
    }

    public void clear()
    {
        this.delegate.clear();
        this.inverse.delegate.clear();
    }

    public V getIfAbsentPut(K key, V value)
    {
        V oldValue = this.delegate.get(key);

        if (oldValue != null || this.delegate.containsKey(key))
        {
            return oldValue;
        }

        this.put(key, value);
        return value;
    }

    public V getIfAbsentPut(K key, Function0 function)
    {
        V value = this.delegate.get(key);

        if (value != null || this.delegate.containsKey(key))
        {
            return value;
        }

        V newValue = function.value();
        this.put(key, newValue);
        return newValue;
    }

    public 

V getIfAbsentPutWith(K key, Function function, P parameter) { V value = this.delegate.get(key); if (value != null || this.delegate.containsKey(key)) { return value; } V newValue = function.valueOf(parameter); this.put(key, newValue); return newValue; } public V getIfAbsentPutWithKey(K key, Function function) { V value = this.delegate.get(key); if (value != null || this.delegate.containsKey(key)) { return value; } V newValue = function.valueOf(key); this.put(key, newValue); return newValue; } public V updateValue(K key, Function0 factory, Function function) { if (this.delegate.containsKey(key)) { V newValue = function.valueOf(this.delegate.get(key)); this.put(key, newValue); return newValue; } V newValue = function.valueOf(factory.value()); this.put(key, newValue); return newValue; } public

V updateValueWith(K key, Function0 factory, Function2 function, P parameter) { if (this.delegate.containsKey(key)) { V newValue = function.value(this.delegate.get(key), parameter); this.put(key, newValue); return newValue; } V newValue = function.value(factory.value(), parameter); this.put(key, newValue); return newValue; } public Set keySet() { return new KeySet(); } public Collection values() { return new ValuesCollection(); } public Set> entrySet() { return new EntrySet(); } public Iterator iterator() { return new InternalIterator(); } public ImmutableBiMap toImmutable() { return BiMaps.immutable.withAll(this.delegate); } public MutableBiMap asSynchronized() { throw new UnsupportedOperationException(this.getClass().getSimpleName() + ".asSynchronized() not implemented yet"); } public MutableBiMap asUnmodifiable() { throw new UnsupportedOperationException(this.getClass().getSimpleName() + ".asUnmodifiable() not implemented yet"); } @Override public MutableBiMap clone() { return new HashBiMap(this); } public MutableBiMap tap(Procedure procedure) { this.forEach(procedure); return this; } public HashBiMap select(final Predicate2 predicate) { final HashBiMap result = HashBiMap.newMap(); this.delegate.forEachKeyValue(new Procedure2() { public void value(K key, V value) { if (predicate.accept(key, value)) { result.put(key, value); } } }); return result; } public HashBiMap reject(final Predicate2 predicate) { final HashBiMap result = HashBiMap.newMap(); this.delegate.forEachKeyValue(new Procedure2() { public void value(K key, V value) { if (!predicate.accept(key, value)) { result.put(key, value); } } }); return result; } public HashBiMap collect(final Function2> function) { final HashBiMap result = HashBiMap.newMap(); this.delegate.forEachKeyValue(new Procedure2() { public void value(K key, V value) { Pair pair = function.value(key, value); result.put(pair.getOne(), pair.getTwo()); } }); return result; } public HashBiMap collectValues(final Function2 function) { final HashBiMap result = HashBiMap.newMap(); this.delegate.forEachKeyValue(new Procedure2() { public void value(K key, V value) { result.put(key, function.value(key, value)); } }); return result; } public MutableBag collect(Function function) { return this.delegate.collect(function); } public MutableBag collectWith(Function2 function, P parameter) { return this.delegate.collectWith(function, parameter); } public MutableBag flatCollect(Function> function) { return this.delegate.flatCollect(function); } public MutableBooleanBag collectBoolean(BooleanFunction booleanFunction) { return this.delegate.collectBoolean(booleanFunction); } public MutableByteBag collectByte(ByteFunction byteFunction) { return this.delegate.collectByte(byteFunction); } public MutableCharBag collectChar(CharFunction charFunction) { return this.delegate.collectChar(charFunction); } public MutableDoubleBag collectDouble(DoubleFunction doubleFunction) { return this.delegate.collectDouble(doubleFunction); } public MutableFloatBag collectFloat(FloatFunction floatFunction) { return this.delegate.collectFloat(floatFunction); } public MutableIntBag collectInt(IntFunction intFunction) { return this.delegate.collectInt(intFunction); } public MutableLongBag collectLong(LongFunction longFunction) { return this.delegate.collectLong(longFunction); } public MutableShortBag collectShort(ShortFunction shortFunction) { return this.delegate.collectShort(shortFunction); } public MutableBag collectIf(Predicate predicate, Function function) { return this.delegate.collectIf(predicate, function); } public MutableSet> zipWithIndex() { return this.delegate.zipWithIndex(new UnifiedSet>()); } public MutableSetMultimap groupBy(Function function) { return this.delegate.groupBy(function, new UnifiedSetMultimap()); } public MutableSetMultimap groupByEach(Function> function) { return this.delegate.groupByEach(function, new UnifiedSetMultimap()); } public MutableSet> zip(Iterable that) { return this.delegate.zip(that, new UnifiedSet>()); } public MutableSet select(Predicate predicate) { return this.delegate.select(predicate, new UnifiedSet()); } public

MutableSet selectWith(Predicate2 predicate, P parameter) { return this.delegate.selectWith(predicate, parameter, new UnifiedSet()); } public MutableSet reject(Predicate predicate) { return this.delegate.reject(predicate, new UnifiedSet()); } public

MutableSet rejectWith(Predicate2 predicate, P parameter) { return this.delegate.rejectWith(predicate, parameter, new UnifiedSet()); } public PartitionMutableSet partition(Predicate predicate) { PartitionMutableSet result = new PartitionUnifiedSet(); this.inverse.forEachKey(new PartitionProcedure(predicate, result)); return result; } public

PartitionMutableSet partitionWith(Predicate2 predicate, P parameter) { return this.partition(Predicates.bind(predicate, parameter)); } @Override public void forEachValue(Procedure procedure) { this.inverse.delegate.forEachKey(procedure); } public MutableBiMap groupByUniqueKey(Function function) { return new HashBiMap(this.delegate.groupByUniqueKey(function)); } public MutableMap aggregateBy(Function groupBy, Function0 zeroValueFactory, Function2 nonMutatingAggregator) { return this.delegate.aggregateBy(groupBy, zeroValueFactory, nonMutatingAggregator); } public MutableMap aggregateInPlaceBy(Function groupBy, Function0 zeroValueFactory, Procedure2 mutatingAggregator) { return this.delegate.aggregateInPlaceBy(groupBy, zeroValueFactory, mutatingAggregator); } public MutableSet selectInstancesOf(Class clazz) { MutableSet result = new UnifiedSet(); this.inverse.forEachKey(new SelectInstancesOfProcedure(clazz, result)); return result; } public void writeExternal(ObjectOutput out) throws IOException { this.delegate.writeExternal(out); } public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { this.delegate = UnifiedMap.newMap(); this.delegate.readExternal(in); final UnifiedMap inverseDelegate = UnifiedMap.newMap(); this.delegate.forEachKeyValue(new Procedure2() { public void value(K key, V value) { inverseDelegate.put(value, key); } }); this.inverse = new Inverse(inverseDelegate, this); } private class InternalIterator implements Iterator { private final Iterator iterator = AbstractMutableBiMap.this.delegate.iterator(); private V currentValue; public boolean hasNext() { return this.iterator.hasNext(); } public V next() { V next = this.iterator.next(); this.currentValue = next; return next; } public void remove() { this.iterator.remove(); AbstractMutableBiMap.this.inverse.delegate.remove(this.currentValue); } } private class KeySet implements Set, Serializable { @Override public boolean equals(Object obj) { return AbstractMutableBiMap.this.delegate.keySet().equals(obj); } @Override public int hashCode() { return AbstractMutableBiMap.this.delegate.keySet().hashCode(); } public int size() { return AbstractMutableBiMap.this.size(); } public boolean isEmpty() { return AbstractMutableBiMap.this.isEmpty(); } public boolean contains(Object key) { return AbstractMutableBiMap.this.delegate.containsKey(key); } public Object[] toArray() { return AbstractMutableBiMap.this.delegate.keySet().toArray(); } public T[] toArray(T[] a) { return AbstractMutableBiMap.this.delegate.keySet().toArray(a); } public boolean add(K key) { throw new UnsupportedOperationException("Cannot call add() on " + this.getClass().getSimpleName()); } public boolean remove(Object key) { int oldSize = AbstractMutableBiMap.this.size(); AbstractMutableBiMap.this.remove(key); return AbstractMutableBiMap.this.size() != oldSize; } public boolean containsAll(Collection source) { for (Object key : source) { if (!AbstractMutableBiMap.this.delegate.containsKey(key)) { return false; } } return true; } public boolean addAll(Collection source) { throw new UnsupportedOperationException("Cannot call addAll() on " + this.getClass().getSimpleName()); } public boolean retainAll(Collection collection) { int oldSize = AbstractMutableBiMap.this.size(); Iterator iterator = this.iterator(); while (iterator.hasNext()) { K next = iterator.next(); if (!collection.contains(next)) { this.remove(next); } } return oldSize != AbstractMutableBiMap.this.size(); } public boolean removeAll(Collection collection) { int oldSize = AbstractMutableBiMap.this.size(); for (Object object : collection) { AbstractMutableBiMap.this.remove(object); } return oldSize != AbstractMutableBiMap.this.size(); } public void clear() { AbstractMutableBiMap.this.clear(); } public Iterator iterator() { return AbstractMutableBiMap.this.inverse().iterator(); } @Override public String toString() { return Iterate.makeString(this, "[", ", ", "]"); } protected Object writeReplace() { MutableSet replace = UnifiedSet.newSet(AbstractMutableBiMap.this.size()); AbstractMutableBiMap.this.forEachKey(CollectionAddProcedure.on(replace)); return replace; } } private class ValuesCollection implements Collection { public int size() { return AbstractMutableBiMap.this.size(); } public boolean isEmpty() { return AbstractMutableBiMap.this.isEmpty(); } public boolean contains(Object key) { return AbstractMutableBiMap.this.inverse.delegate.containsKey(key); } public Object[] toArray() { return AbstractMutableBiMap.this.delegate.values().toArray(); } public T[] toArray(T[] a) { return AbstractMutableBiMap.this.delegate.values().toArray(a); } public boolean add(V v) { throw new UnsupportedOperationException("Cannot call add() on " + this.getClass().getSimpleName()); } public boolean remove(Object value) { int oldSize = AbstractMutableBiMap.this.size(); AbstractMutableBiMap.this.inverse().remove(value); return oldSize != AbstractMutableBiMap.this.size(); } public boolean containsAll(Collection collection) { for (Object key : collection) { if (!AbstractMutableBiMap.this.inverse.delegate.containsKey(key)) { return false; } } return true; } public boolean addAll(Collection collection) { throw new UnsupportedOperationException("Cannot call addAll() on " + this.getClass().getSimpleName()); } public boolean removeAll(Collection collection) { int oldSize = AbstractMutableBiMap.this.size(); for (Object object : collection) { this.remove(object); } return oldSize != AbstractMutableBiMap.this.size(); } public boolean retainAll(Collection collection) { int oldSize = AbstractMutableBiMap.this.size(); Iterator iterator = this.iterator(); while (iterator.hasNext()) { V next = iterator.next(); if (!collection.contains(next)) { this.remove(next); } } return oldSize != AbstractMutableBiMap.this.size(); } public void clear() { AbstractMutableBiMap.this.clear(); } public Iterator iterator() { return AbstractMutableBiMap.this.iterator(); } @Override public String toString() { return Iterate.makeString(this, "[", ", ", "]"); } } private class EntrySet implements Set> { @Override public boolean equals(Object obj) { if (obj instanceof Set) { Set other = (Set) obj; if (other.size() == this.size()) { return this.containsAll(other); } } return false; } @Override public int hashCode() { return AbstractMutableBiMap.this.hashCode(); } public int size() { return AbstractMutableBiMap.this.size(); } public boolean isEmpty() { return AbstractMutableBiMap.this.isEmpty(); } public boolean contains(Object o) { if (!(o instanceof Map.Entry)) { return false; } Map.Entry entry = (Map.Entry) o; K key = entry.getKey(); V actualValue = AbstractMutableBiMap.this.get(key); if (actualValue != null) { return actualValue.equals(entry.getValue()); } return entry.getValue() == null && AbstractMutableBiMap.this.containsKey(key); } public Object[] toArray() { Object[] result = new Object[AbstractMutableBiMap.this.size()]; return this.copyEntries(result); } public T[] toArray(T[] result) { int size = AbstractMutableBiMap.this.size(); if (result.length < size) { result = (T[]) Array.newInstance(result.getClass().getComponentType(), size); } this.copyEntries(result); if (size < result.length) { result[size] = null; } return result; } public boolean add(Map.Entry entry) { throw new UnsupportedOperationException(); } public boolean remove(Object e) { if (!(e instanceof Map.Entry)) { return false; } Map.Entry entry = (Map.Entry) e; K key = (K) entry.getKey(); V value = (V) entry.getValue(); V actualValue = AbstractMutableBiMap.this.delegate.get(key); if (actualValue != null) { if (actualValue.equals(value)) { AbstractMutableBiMap.this.remove(key); return true; } return false; } if (value == null && AbstractMutableBiMap.this.delegate.containsKey(key)) { AbstractMutableBiMap.this.remove(key); return true; } return false; } public boolean containsAll(Collection collection) { for (Object obj : collection) { if (!this.contains(obj)) { return false; } } return true; } public boolean addAll(Collection> collection) { throw new UnsupportedOperationException("Cannot call addAll() on " + this.getClass().getSimpleName()); } public boolean retainAll(Collection collection) { int oldSize = AbstractMutableBiMap.this.size(); Iterator> iterator = this.iterator(); while (iterator.hasNext()) { Map.Entry next = iterator.next(); if (!collection.contains(next)) { iterator.remove(); } } return oldSize != AbstractMutableBiMap.this.size(); } public boolean removeAll(Collection collection) { boolean changed = false; for (Object obj : collection) { if (this.remove(obj)) { changed = true; } } return changed; } public void clear() { AbstractMutableBiMap.this.clear(); } public Iterator> iterator() { return new InternalEntrySetIterator(); } private Object[] copyEntries(Object[] result) { int count = 0; for (Pair pair : AbstractMutableBiMap.this.keyValuesView()) { result[count] = new InternalEntry(pair.getOne(), pair.getTwo()); count++; } return result; } private class InternalEntrySetIterator implements Iterator> { private final Iterator> iterator = AbstractMutableBiMap.this.delegate.entrySet().iterator(); private V currentValue; public boolean hasNext() { return this.iterator.hasNext(); } public Entry next() { Entry next = this.iterator.next(); Entry result = new InternalEntry(next.getKey(), next.getValue()); this.currentValue = result.getValue(); return result; } public void remove() { this.iterator.remove(); AbstractMutableBiMap.this.inverse.delegate.removeKey(this.currentValue); } } private final class InternalEntry implements Entry { private final K key; private V value; private InternalEntry(K key, V value) { this.key = key; this.value = value; } public K getKey() { return this.key; } public V getValue() { return this.value; } @Override public boolean equals(Object obj) { if (obj instanceof Entry) { Entry other = (Entry) obj; Object otherKey = other.getKey(); Object otherValue = other.getValue(); return AbstractMutableBiMap.nullSafeEquals(this.key, otherKey) && AbstractMutableBiMap.nullSafeEquals(this.value, otherValue); } return false; } @Override public int hashCode() { return (this.key == null ? 0 : this.key.hashCode()) ^ (this.value == null ? 0 : this.value.hashCode()); } @Override public String toString() { return this.key + "=" + this.value; } public V setValue(V value) { V result = AbstractMutableBiMap.this.put(this.key, value); this.value = value; return result; } } } private static class Inverse extends AbstractMutableBiMap implements Externalizable { private static final long serialVersionUID = 1L; public Inverse() { // Empty constructor for Externalizable class super(UnifiedMap.newMap(), UnifiedMap.newMap()); } Inverse(Map delegate, AbstractMutableBiMap inverse) { super(delegate, inverse); } } }