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    • com.gs.collections.impl.bag.immutable.ImmutableSingletonBag Maven / Gradle / Ivy

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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.bag.immutable;

import java.io.Serializable;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.NoSuchElementException;

import com.gs.collections.api.bag.Bag;
import com.gs.collections.api.bag.ImmutableBag;
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.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.predicate.primitive.IntPredicate;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.multimap.MutableMultimap;
import com.gs.collections.api.multimap.bag.ImmutableBagMultimap;
import com.gs.collections.api.ordered.OrderedIterable;
import com.gs.collections.api.set.ImmutableSet;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.bag.mutable.HashBag;
import com.gs.collections.impl.block.factory.Comparators;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.block.factory.Predicates2;
import com.gs.collections.impl.block.procedure.MultimapEachPutProcedure;
import com.gs.collections.impl.factory.Bags;
import com.gs.collections.impl.factory.Sets;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.multimap.bag.HashBagMultimap;
import com.gs.collections.impl.tuple.Tuples;
import com.gs.collections.impl.utility.ArrayIterate;
import com.gs.collections.impl.utility.Iterate;

/**
 * @since 1.0
 */
final class ImmutableSingletonBag
        extends AbstractImmutableBag implements Serializable
{
    private static final long serialVersionUID = 1L;

    private final T value;

    ImmutableSingletonBag(T object)
    {
        this.value = object;
    }

    @Override
    public boolean allSatisfy(Predicate predicate)
    {
        return predicate.accept(this.value);
    }

    @Override
    public boolean noneSatisfy(Predicate predicate)
    {
        return !predicate.accept(this.value);
    }

    @Override
    public  IV injectInto(IV injectedValue, Function2 function)
    {
        return function.value(injectedValue, this.value);
    }

    @Override
    public T min(Comparator comparator)
    {
        return this.value;
    }

    @Override
    public T max(Comparator comparator)
    {
        return this.value;
    }

    @Override
    public T min()
    {
        return this.value;
    }

    @Override
    public T max()
    {
        return this.value;
    }

    @Override
    public > T minBy(Function function)
    {
        return this.value;
    }

    @Override
    public > T maxBy(Function function)
    {
        return this.value;
    }

    public ImmutableBag newWith(T element)
    {
        return Bags.immutable.with(this.value, element);
    }

    public ImmutableBag newWithout(T element)
    {
        return this.emptyIfMatchesOrThis(Predicates.equal(element));
    }

    private ImmutableBag emptyIfMatchesOrThis(Predicate predicate)
    {
        return predicate.accept(this.value) ? Bags.immutable.empty() : this;
    }

    public ImmutableBag newWithAll(Iterable elements)
    {
        return HashBag.newBag(elements).with(this.value).toImmutable();
    }

    public ImmutableBag newWithoutAll(Iterable elements)
    {
        return this.emptyIfMatchesOrThis(Predicates.in(elements));
    }

    public int size()
    {
        return 1;
    }

    @Override
    public boolean isEmpty()
    {
        return false;
    }

    @Override
    public boolean notEmpty()
    {
        return true;
    }

    public T getFirst()
    {
        return this.value;
    }

    public T getLast()
    {
        return this.value;
    }

    @Override
    public boolean contains(Object object)
    {
        return Comparators.nullSafeEquals(this.value, object);
    }

    @Override
    public boolean containsAllIterable(Iterable source)
    {
        return Iterate.allSatisfy(source, Predicates.equal(this.value));
    }

    @Override
    public boolean containsAllArguments(Object... elements)
    {
        return ArrayIterate.allSatisfy(elements, Predicates.equal(this.value));
    }

    public ImmutableBag selectByOccurrences(IntPredicate predicate)
    {
        return predicate.accept(1)
                ? this
                : Bags.immutable.empty();
    }

    public ImmutableBag select(Predicate predicate)
    {
        return predicate.accept(this.value)
                ? this
                : Bags.immutable.empty();
    }

    @Override
    public > R select(Predicate predicate, R target)
    {
        if (predicate.accept(this.value))
        {
            target.add(this.value);
        }
        return target;
    }

    @Override
    public > R selectWith(
            Predicate2 predicate,
            P parameter,
            R target)
    {
        if (predicate.accept(this.value, parameter))
        {
            target.add(this.value);
        }
        return target;
    }

    public ImmutableBag reject(Predicate predicate)
    {
        return this.select(Predicates.not(predicate));
    }

    @Override
    public > R reject(Predicate predicate, R target)
    {
        return this.select(Predicates.not(predicate), target);
    }

    @Override
    public > R rejectWith(
            Predicate2 predicate,
            P parameter,
            R target)
    {
        return this.selectWith(Predicates2.not(predicate), parameter, target);
    }

    public  ImmutableBag selectInstancesOf(Class clazz)
    {
        return clazz.isInstance(this.value)
                ? (ImmutableBag) this
                : Bags.immutable.empty();
    }

    public  ImmutableBag collect(Function function)
    {
        return Bags.immutable.with(function.valueOf(this.value));
    }

    public  ImmutableBag collectIf(
            Predicate predicate,
            Function function)
    {
        return predicate.accept(this.value)
                ? Bags.immutable.with(function.valueOf(this.value))
                : Bags.immutable.empty();
    }

    @Override
    public > R collectIf(
            Predicate predicate, Function function, R target)
    {
        if (predicate.accept(this.value))
        {
            target.add(function.valueOf(this.value));
        }
        return target;
    }

    public  ImmutableBag flatCollect(Function> function)
    {
        return this.flatCollect(function, HashBag.newBag()).toImmutable();
    }

    @Override
    public > R flatCollect(
            Function> function, R target)
    {
        Iterate.addAllTo(function.valueOf(this.value), target);
        return target;
    }

    @Override
    public T detect(Predicate predicate)
    {
        return predicate.accept(this.value)
                ? this.value
                : null;
    }

    @Override
    public T detectIfNone(Predicate predicate, Function0 function)
    {
        return predicate.accept(this.value)
                ? this.value
                : function.value();
    }

    @Override
    public int count(Predicate predicate)
    {
        return predicate.accept(this.value)
                ? 1
                : 0;
    }

    @Override
    public boolean anySatisfy(Predicate predicate)
    {
        return predicate.accept(this.value);
    }

    public  ImmutableBagMultimap groupBy(Function function)
    {
        return this.groupBy(function, HashBagMultimap.newMultimap()).toImmutable();
    }

    @Override
    public > R groupBy(Function function, R target)
    {
        target.putAll(function.valueOf(this.value), this);
        return target;
    }

    public  ImmutableBagMultimap groupByEach(Function> function)
    {
        return this.groupByEach(function, HashBagMultimap.newMultimap()).toImmutable();
    }

    @Override
    public > R groupByEach(Function> function, R target)
    {
        this.forEach(MultimapEachPutProcedure.on(target, function));
        return target;
    }

    public int sizeDistinct()
    {
        return 1;
    }

    public int occurrencesOf(Object item)
    {
        return Comparators.nullSafeEquals(this.value, item) ? 1 : 0;
    }

    public void forEachWithOccurrences(ObjectIntProcedure objectIntProcedure)
    {
        objectIntProcedure.value(this.value, 1);
    }

    public MutableMap toMapOfItemToCount()
    {
        return UnifiedMap.newWithKeysValues(this.value, 1);
    }

    public ImmutableBag toImmutable()
    {
        return this;
    }

    public void each(Procedure procedure)
    {
        procedure.value(this.value);
    }

    @Override
    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
        objectIntProcedure.value(this.value, 0);
    }

    @Override
    public 
     void forEachWith(Procedure2 procedure, P parameter)
    {
        procedure.value(this.value, parameter);
    }

    /**
     * @deprecated in 6.0. Use {@link OrderedIterable#zip(Iterable)} instead.
     */
    @Deprecated
    public  ImmutableBag> zip(Iterable that)
    {
        Iterator iterator = that.iterator();
        if (!iterator.hasNext())
        {
            return Bags.immutable.empty();
        }
        return Bags.immutable.with(Tuples.pair(this.value, iterator.next()));
    }

    /**
     * @deprecated in 6.0. Use {@link OrderedIterable#zipWithIndex()} instead.
     */
    @Deprecated
    public ImmutableSet> zipWithIndex()
    {
        return Sets.immutable.with(Tuples.pair(this.value, 0));
    }

    public Iterator iterator()
    {
        return new SingletonIterator();
    }

    private class SingletonIterator
            implements Iterator
    {
        private boolean next = true;

        public boolean hasNext()
        {
            return this.next;
        }

        public T next()
        {
            if (this.next)
            {
                this.next = false;
                return ImmutableSingletonBag.this.value;
            }
            throw new NoSuchElementException("i=" + this.next);
        }

        public void remove()
        {
            throw new UnsupportedOperationException("Cannot remove from an ImmutableBag");
        }
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj)
        {
            return true;
        }
        if (!(obj instanceof Bag))
        {
            return false;
        }
        Bag bag = (Bag) obj;
        if (this.size() != bag.size())
        {
            return false;
        }
        return this.occurrencesOf(this.value) == bag.occurrencesOf(this.value);
    }

    @Override
    public String toString()
    {
        return '[' + this.makeString() + ']';
    }

    @Override
    public int hashCode()
    {
        return (this.value == null ? 0 : this.value.hashCode()) ^ 1;
    }

    private Object writeReplace()
    {
        return new ImmutableBagSerializationProxy(this);
    }
}
    
    
    
    

    




    
    
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