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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 2013 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.api.list;

import java.util.Comparator;
import java.util.List;

import com.gs.collections.api.block.function.Function;
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.collection.MutableCollection;
import com.gs.collections.api.list.primitive.MutableBooleanList;
import com.gs.collections.api.list.primitive.MutableByteList;
import com.gs.collections.api.list.primitive.MutableCharList;
import com.gs.collections.api.list.primitive.MutableDoubleList;
import com.gs.collections.api.list.primitive.MutableFloatList;
import com.gs.collections.api.list.primitive.MutableIntList;
import com.gs.collections.api.list.primitive.MutableLongList;
import com.gs.collections.api.list.primitive.MutableShortList;
import com.gs.collections.api.multimap.list.MutableListMultimap;
import com.gs.collections.api.partition.list.PartitionMutableList;
import com.gs.collections.api.tuple.Pair;

/**
 * A MutableList is an implementation of a JCF List which provides methods matching the Smalltalk Collection protocol.
 */
public interface MutableList
        extends MutableCollection, List, Cloneable, ListIterable
{
    MutableList with(T element);

    MutableList without(T element);

    MutableList withAll(Iterable elements);

    MutableList withoutAll(Iterable elements);

    MutableList newEmpty();

    MutableList clone();

    MutableList select(Predicate predicate);

     MutableList selectWith(Predicate2 predicate, P parameter);

    MutableList reject(Predicate predicate);

     MutableList rejectWith(Predicate2 predicate, P parameter);

    PartitionMutableList partition(Predicate predicate);

     MutableList selectInstancesOf(Class clazz);

     MutableList collect(Function function);

    MutableBooleanList collectBoolean(BooleanFunction booleanFunction);

    MutableByteList collectByte(ByteFunction byteFunction);

    MutableCharList collectChar(CharFunction charFunction);

    MutableDoubleList collectDouble(DoubleFunction doubleFunction);

    MutableFloatList collectFloat(FloatFunction floatFunction);

    MutableIntList collectInt(IntFunction intFunction);

    MutableLongList collectLong(LongFunction longFunction);

    MutableShortList collectShort(ShortFunction shortFunction);

     MutableList collectWith(Function2 function, P parameter);

     MutableList collectIf(Predicate predicate, Function function);

     MutableList flatCollect(Function> function);

    MutableList distinct();

    /**
     * Sorts the internal data structure of this list and returns the list itself as a convenience.
     */
    MutableList sortThis(Comparator comparator);

    /**
     * Sorts the internal data structure of this list and returns the list itself as a convenience.
     */
    MutableList sortThis();

    /**
     * Sorts the internal data structure of this list based on the natural order of the attribute returned by {@code
     * function}.
     */
    > MutableList sortThisBy(Function function);

    MutableList subList(int fromIndex, int toIndex);

    /**
     * Returns an unmodifable view of the list.
     * The returned list will be Serializable if this list is Serializable.
     *
     * @return an unmodifiable view of this list
     */
    MutableList asUnmodifiable();

    MutableList asSynchronized();

    /**
     * Returns an immutable copy of this list. If the list is immutable, it returns itself.
     * The returned list will be Serializable if this list is Serializable.
     */
    ImmutableList toImmutable();

     MutableListMultimap groupBy(Function function);

     MutableListMultimap groupByEach(Function> function);

     MutableList> zip(Iterable that);

    MutableList> zipWithIndex();

    MutableList takeWhile(Predicate predicate);

    MutableList dropWhile(Predicate predicate);

    PartitionMutableList partitionWhile(Predicate predicate);

    /**
     * Returns a new MutableList in reverse order
     */
    MutableList toReversed();

    /**
     * Mutates the current list by reversing its order and returns the current list as a result
     */
    MutableList reverseThis();
}