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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.block.function;

import java.util.Collection;

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.FloatObjectToFloatFunction;
import com.gs.collections.api.block.function.primitive.IntObjectToIntFunction;
import com.gs.collections.api.block.function.primitive.LongObjectToLongFunction;

/**
 * Provides static Function2s which can be used by Iterate.injectInto for adding primitives or to a collection
 */
public final class AddFunction
{
    public static final IntObjectToIntFunction INTEGER_TO_INT = new AddIntegerToIntFunction();
    public static final LongObjectToLongFunction INTEGER_TO_LONG = new AddIntegerToLongFunction();
    public static final DoubleObjectToDoubleFunction INTEGER_TO_DOUBLE = new AddIntegerToDoubleFunction();
    public static final FloatObjectToFloatFunction INTEGER_TO_FLOAT = new AddIntegerToFloatFunction();
    public static final DoubleObjectToDoubleFunction DOUBLE_TO_DOUBLE = new AddDoubleToDoubleFunction();
    public static final FloatObjectToFloatFunction FLOAT_TO_FLOAT = new AddFloatToFloatFunction();
    public static final Function2 INTEGER = new AddIntegerFunction();
    public static final Function2 DOUBLE = new AddDoubleFunction();
    public static final Function2 FLOAT = new AddFloatFunction();
    public static final Function2 LONG = new AddLongFunction();
    public static final Function2 STRING = new AddStringFunction();
    public static final Function2, ?, Collection> COLLECTION = new AddCollectionFunction();

    private AddFunction()
    {
        throw new AssertionError("Suppress default constructor for noninstantiability");
    }

    private static class AddIntegerToIntFunction implements IntObjectToIntFunction
    {
        private static final long serialVersionUID = 1L;

        public int intValueOf(int intParameter, Integer objectParameter)
        {
            return intParameter + objectParameter;
        }
    }

    private static class AddIntegerToLongFunction implements LongObjectToLongFunction
    {
        private static final long serialVersionUID = 1L;

        public long longValueOf(long longParameter, Integer objectParameter)
        {
            return longParameter + objectParameter.longValue();
        }
    }

    private static class AddIntegerToDoubleFunction implements DoubleObjectToDoubleFunction
    {
        private static final long serialVersionUID = 1L;

        public double doubleValueOf(double doubleParameter, Integer objectParameter)
        {
            return doubleParameter + objectParameter;
        }
    }

    private static class AddIntegerToFloatFunction implements FloatObjectToFloatFunction
    {
        private static final long serialVersionUID = 1L;

        public float floatValueOf(float floatParameter, Integer objectParameter)
        {
            return floatParameter + objectParameter;
        }
    }

    private static class AddDoubleToDoubleFunction implements DoubleObjectToDoubleFunction
    {
        private static final long serialVersionUID = 1L;

        public double doubleValueOf(double doubleParameter, Double objectParameter)
        {
            return doubleParameter + objectParameter;
        }
    }

    private static class AddFloatToFloatFunction implements FloatObjectToFloatFunction
    {
        private static final long serialVersionUID = 1L;

        public float floatValueOf(float floatParameter, Float objectParameter)
        {
            return floatParameter + objectParameter;
        }
    }

    private static class AddIntegerFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Integer value(Integer argument1, Integer argument2)
        {
            return argument1 + argument2;
        }
    }

    private static class AddDoubleFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Double value(Double argument1, Double argument2)
        {
            return argument1 + argument2;
        }
    }

    private static class AddFloatFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Float value(Float argument1, Float argument2)
        {
            return argument1 + argument2;
        }
    }

    private static class AddLongFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public Long value(Long argument1, Long argument2)
        {
            return argument1 + argument2;
        }
    }

    private static class AddStringFunction implements Function2
    {
        private static final long serialVersionUID = 1L;

        public String value(String argument1, String argument2)
        {
            if (argument1 != null && argument2 != null)
            {
                return argument1 + argument2;
            }

            return argument1 == null ? argument2 : argument1;
        }
    }

    private static class AddCollectionFunction implements Function2, T, Collection>
    {
        private static final long serialVersionUID = 1L;

        public Collection value(Collection collection, T addElement)
        {
            collection.add(addElement);
            return collection;
        }
    }
}