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    • com.gs.collections.impl.list.immutable.ImmutableEmptyList 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.list.immutable;

import java.io.IOException;
import java.io.Serializable;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.RandomAccess;

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.DoubleObjectToDoubleFunction;
import com.gs.collections.api.block.function.primitive.IntObjectToIntFunction;
import com.gs.collections.api.block.function.primitive.LongObjectToLongFunction;
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.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.api.list.ImmutableList;
import com.gs.collections.api.partition.list.PartitionImmutableList;
import com.gs.collections.api.stack.MutableStack;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.factory.Lists;
import com.gs.collections.impl.factory.Stacks;
import com.gs.collections.impl.partition.list.PartitionFastList;
import net.jcip.annotations.Immutable;

/**
 * This is a zero element {@link ImmutableList} which is created by calling the Lists.immutable.empty() method.
 */
@Immutable
final class ImmutableEmptyList
        extends AbstractImmutableList
        implements Serializable, RandomAccess
{
    static final ImmutableList INSTANCE = new ImmutableEmptyList();
    private static final PartitionImmutableList EMPTY = new PartitionFastList().toImmutable();

    private static final long serialVersionUID = 1L;

    private Object readResolve()
    {
        return INSTANCE;
    }

    @Override
    public ImmutableList newWithout(T element)
    {
        return this;
    }

    @Override
    public ImmutableList newWithoutAll(Iterable elements)
    {
        return this;
    }

    public int size()
    {
        return 0;
    }

    @Override
    public boolean contains(Object obj)
    {
        return false;
    }

    public T get(int index)
    {
        throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + this.size());
    }

    @Override
    public ImmutableList tap(Procedure procedure)
    {
        return this;
    }

    public void each(Procedure procedure)
    {
    }

    @Override
    public void reverseForEach(Procedure procedure)
    {
    }

    @Override
    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
    }

    @Override
    public 
     void forEachWith(Procedure2 procedure, P parameter)
    {
    }

    public ImmutableList newWith(T newItem)
    {
        return Lists.immutable.with(newItem);
    }

    @Override
    public T min(Comparator comparator)
    {
        throw new NoSuchElementException();
    }

    @Override
    public T max(Comparator comparator)
    {
        throw new NoSuchElementException();
    }

    @Override
    public T min()
    {
        throw new NoSuchElementException();
    }

    @Override
    public T max()
    {
        throw new NoSuchElementException();
    }

    @Override
    public > T minBy(Function function)
    {
        throw new NoSuchElementException();
    }

    @Override
    public > T maxBy(Function function)
    {
        throw new NoSuchElementException();
    }

    @Override
    public  ImmutableList> zip(Iterable that)
    {
        return Lists.immutable.empty();
    }

    @Override
    public >> R zip(Iterable that, R target)
    {
        return target;
    }

    @Override
    public ImmutableList> zipWithIndex()
    {
        return Lists.immutable.empty();
    }

    @Override
    public MutableStack toStack()
    {
        return Stacks.mutable.empty();
    }

    @Override
    public >> R zipWithIndex(R target)
    {
        return target;
    }

    @Override
    public ImmutableList select(Predicate predicate)
    {
        return this;
    }

    @Override
    public > R selectWith(Predicate2 predicate, P parameter, R target)
    {
        return target;
    }

    @Override
    public ImmutableList reject(Predicate predicate)
    {
        return this;
    }

    @Override
    public > R rejectWith(Predicate2 predicate, P parameter, R target)
    {
        return target;
    }

    @Override
    public PartitionImmutableList partition(Predicate predicate)
    {
        return (PartitionImmutableList) EMPTY;
    }

    @Override
    public  ImmutableList collect(Function function)
    {
        return Lists.immutable.empty();
    }

    @Override
    public  ImmutableList collectIf(Predicate predicate, Function function)
    {
        return Lists.immutable.empty();
    }

    @Override
    public > R collectWith(Function2 function, P parameter, R target)
    {
        return target;
    }

    @Override
    public  ImmutableList flatCollect(Function> function)
    {
        return Lists.immutable.empty();
    }

    @Override
    public > R flatCollect(Function> function, R targetCollection)
    {
        return targetCollection;
    }

    @Override
    public T detect(Predicate predicate)
    {
        return null;
    }

    @Override
    public int count(Predicate predicate)
    {
        return 0;
    }

    @Override
    public 
     int countWith(Predicate2 predicate, P parameter)
    {
        return 0;
    }

    @Override
    public boolean anySatisfy(Predicate predicate)
    {
        return false;
    }

    @Override
    public boolean allSatisfy(Predicate predicate)
    {
        return true;
    }

    @Override
    public boolean noneSatisfy(Predicate predicate)
    {
        return true;
    }

    @Override
    public 
     boolean anySatisfyWith(Predicate2 predicate, P parameter)
    {
        return false;
    }

    @Override
    public 
     boolean allSatisfyWith(Predicate2 predicate, P parameter)
    {
        return true;
    }

    @Override
    public 
     boolean noneSatisfyWith(Predicate2 predicate, P parameter)
    {
        return true;
    }

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

    @Override
    public int injectInto(int injectedValue, IntObjectToIntFunction intObjectToIntFunction)
    {
        return injectedValue;
    }

    @Override
    public long injectInto(long injectedValue, LongObjectToLongFunction longObjectToLongFunction)
    {
        return injectedValue;
    }

    @Override
    public double injectInto(double injectedValue, DoubleObjectToDoubleFunction doubleObjectToDoubleFunction)
    {
        return injectedValue;
    }

    @Override
    public T getFirst()
    {
        return null;
    }

    @Override
    public T getLast()
    {
        return null;
    }

    @Override
    public int indexOf(Object object)
    {
        return -1;
    }

    @Override
    public boolean equals(Object otherList)
    {
        if (otherList == this)
        {
            return true;
        }
        if (!(otherList instanceof List))
        {
            return false;
        }
        List list = (List) otherList;
        return list.isEmpty();
    }

    @Override
    public int hashCode()
    {
        return 1;
    }

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

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

    @Override
    public > R select(Predicate predicate, R target)
    {
        return target;
    }

    @Override
    public > R reject(Predicate predicate, R target)
    {
        return target;
    }

    @Override
    public > R collect(Function function, R target)
    {
        return target;
    }

    @Override
    public > R collectIf(Predicate predicate, Function function, R target)
    {
        return target;
    }

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

    @Override
    public String toString()
    {
        return "[]";
    }

    @Override
    public String makeString()
    {
        return "";
    }

    @Override
    public String makeString(String separator)
    {
        return "";
    }

    @Override
    public String makeString(String start, String separator, String end)
    {
        return start + end;
    }

    @Override
    public void appendString(Appendable appendable)
    {
    }

    @Override
    public void appendString(Appendable appendable, String separator)
    {
    }

    @Override
    public void appendString(Appendable appendable, String start, String separator, String end)
    {
        try
        {
            appendable.append(start);
            appendable.append(end);
        }
        catch (IOException e)
        {
            throw new RuntimeException(e);
        }
    }

    @Override
    public ImmutableList take(int count)
    {
        if (count < 0)
        {
            throw new IllegalArgumentException("Count must be greater than zero, but was: " + count);
        }
        return this;
    }

    @Override
    public ImmutableList takeWhile(Predicate predicate)
    {
        return this;
    }

    @Override
    public ImmutableList drop(int count)
    {
        if (count < 0)
        {
            throw new IllegalArgumentException("Count must be greater than zero, but was: " + count);
        }
        return this;
    }

    @Override
    public ImmutableList dropWhile(Predicate predicate)
    {
        return this;
    }

    @Override
    public PartitionImmutableList partitionWhile(Predicate predicate)
    {
        return (PartitionImmutableList) EMPTY;
    }
}
    
    
    
    

    




    
    
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