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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.collection.mutable;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.RandomAccess;

import com.gs.collections.api.RichIterable;
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.Function3;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.collection.MutableCollection;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.map.MutableMap;
import com.gs.collections.api.tuple.Twin;
import com.gs.collections.impl.AbstractRichIterable;
import com.gs.collections.impl.block.factory.Comparators;
import com.gs.collections.impl.block.factory.Procedures2;
import com.gs.collections.impl.block.procedure.MutatingAggregationProcedure;
import com.gs.collections.impl.block.procedure.NonMutatingAggregationProcedure;
import com.gs.collections.impl.factory.Lists;
import com.gs.collections.impl.map.mutable.UnifiedMap;
import com.gs.collections.impl.utility.Iterate;
import com.gs.collections.impl.utility.internal.IterableIterate;

public abstract class AbstractMutableCollection
        extends AbstractRichIterable
        implements MutableCollection
{
    public 

Twin> selectAndRejectWith( Predicate2 predicate, P parameter) { return IterableIterate.selectAndRejectWith(this, predicate, parameter); } public boolean removeIf(Predicate predicate) { return IterableIterate.removeIf(this, predicate); } public

boolean removeIfWith(Predicate2 predicate, P parameter) { return IterableIterate.removeIfWith(this, predicate, parameter); } public IV injectIntoWith( IV injectValue, Function3 function, P parameter) { return IterableIterate.injectIntoWith(injectValue, this, function, parameter); } public boolean addAllIterable(Iterable iterable) { int oldSize = this.size(); if (iterable instanceof List && iterable instanceof RandomAccess) { List list = (List) iterable; int size = list.size(); for (int i = 0; i < size; i++) { this.add(list.get(i)); } } else { Iterate.forEachWith(iterable, Procedures2.addToCollection(), this); } return oldSize != this.size(); } public boolean removeAllIterable(Iterable iterable) { return this.removeAll(CollectionAdapter.wrapSet(iterable)); } public boolean retainAllIterable(Iterable iterable) { return this.retainAll(CollectionAdapter.wrapSet(iterable)); } public RichIterable> chunk(int size) { if (size <= 0) { throw new IllegalArgumentException("Size for groups must be positive but was: " + size); } Iterator iterator = this.iterator(); MutableList> result = Lists.mutable.empty(); while (iterator.hasNext()) { MutableCollection batch = this.newEmpty(); for (int i = 0; i < size && iterator.hasNext(); i++) { batch.add(iterator.next()); } result.add(batch); } return result; } public MutableMap aggregateInPlaceBy( Function groupBy, Function0 zeroValueFactory, Procedure2 mutatingAggregator) { MutableMap map = UnifiedMap.newMap(); this.forEach(new MutatingAggregationProcedure(map, groupBy, zeroValueFactory, mutatingAggregator)); return map; } public MutableMap aggregateBy( Function groupBy, Function0 zeroValueFactory, Function2 nonMutatingAggregator) { MutableMap map = UnifiedMap.newMap(); this.forEach(new NonMutatingAggregationProcedure(map, groupBy, zeroValueFactory, nonMutatingAggregator)); return map; } public boolean add(T element) { throw new UnsupportedOperationException("Cannot call add() on " + this.getClass().getSimpleName()); } public boolean remove(Object o) { Iterator iterator = this.iterator(); while (iterator.hasNext()) { if (Comparators.nullSafeEquals(o, iterator.next())) { iterator.remove(); return true; } } return false; } public boolean addAll(Collection source) { return this.addAllIterable(source); } public boolean removeAll(Collection source) { return this.removeAllIterable(source); } public boolean retainAll(Collection source) { int oldSize = this.size(); Iterator iterator = this.iterator(); while (iterator.hasNext()) { if (!source.contains(iterator.next())) { iterator.remove(); } } return this.size() != oldSize; } public MutableMap groupByUniqueKey(Function function) { return Iterate.groupByUniqueKey(this, function); } }





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