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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.lazy;

import java.util.Iterator;

import com.gs.collections.api.block.function.Function;
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;
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.impl.block.factory.Functions;
import com.gs.collections.impl.block.factory.Predicates;
import com.gs.collections.impl.lazy.iterator.CollectIterator;
import com.gs.collections.impl.utility.Iterate;
import net.jcip.annotations.Immutable;

/**
 * A CollectIterable is an iterable that transforms a source iterable using a function as it iterates.
 */
@Immutable
public class CollectIterable
        extends AbstractLazyIterable
{
    private final Iterable adapted;
    private final Function function;

    public CollectIterable(Iterable newAdapted, Function function)
    {
        this.adapted = newAdapted;
        this.function = function;
    }

    public void each(Procedure procedure)
    {
        Iterate.forEach(this.adapted, Functions.bind(procedure, this.function));
    }

    @Override
    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
        Iterate.forEachWithIndex(this.adapted, Functions.bind(objectIntProcedure, this.function));
    }

    @Override
    public  void forEachWith(Procedure2 procedure, P parameter)
    {
        Iterate.forEachWith(this.adapted, Functions.bind(procedure, this.function), parameter);
    }

    public Iterator iterator()
    {
        return new CollectIterator(this.adapted, this.function);
    }

    @Override
    public int size()
    {
        return Iterate.sizeOf(this.adapted);
    }

    @Override
    public boolean isEmpty()
    {
        return Iterate.isEmpty(this.adapted);
    }

    @Override
    public boolean notEmpty()
    {
        return !this.isEmpty();
    }

    @Override
    public Object[] toArray()
    {
        return this.toList().toArray();
    }

    @Override
    public boolean anySatisfy(Predicate predicate)
    {
        return Iterate.anySatisfy(this.adapted, Predicates.attributePredicate(this.function, predicate));
    }

    @Override
    public 
 boolean anySatisfyWith(Predicate2 predicate, P parameter)
    {
        return this.anySatisfy(Predicates.bind(predicate, parameter));
    }

    @Override
    public boolean allSatisfy(Predicate predicate)
    {
        return Iterate.allSatisfy(this.adapted, Predicates.attributePredicate(this.function, predicate));
    }

    @Override
    public 
 boolean allSatisfyWith(Predicate2 predicate, P parameter)
    {
        return this.allSatisfy(Predicates.bind(predicate, parameter));
    }

    @Override
    public boolean noneSatisfy(Predicate predicate)
    {
        return Iterate.noneSatisfy(this.adapted, Predicates.attributePredicate(this.function, predicate));
    }

    @Override
    public 
 boolean noneSatisfyWith(Predicate2 predicate, P parameter)
    {
        return this.noneSatisfy(Predicates.bind(predicate, parameter));
    }

    @Override
    public V detect(Predicate predicate)
    {
        T resultItem = Iterate.detect(this.adapted, Predicates.attributePredicate(this.function, predicate));
        return resultItem == null ? null : this.function.valueOf(resultItem);
    }

    @Override
    public  V detectWith(Predicate2 predicate, P parameter)
    {
        return this.detect(Predicates.bind(predicate, parameter));
    }

    @Override
    public  IV injectInto(IV injectedValue, final Function2 f)
    {
        return Iterate.injectInto(injectedValue, this.adapted, new Function2()
        {
            public IV value(IV argument1, T argument2)
            {
                return f.value(argument1, CollectIterable.this.function.valueOf(argument2));
            }
        });
    }

    @Override
    public int injectInto(int injectedValue, final IntObjectToIntFunction f)
    {
        return Iterate.injectInto(injectedValue, this.adapted, new IntObjectToIntFunction()
        {
            public int intValueOf(int intParameter, T objectParameter)
            {
                return f.intValueOf(intParameter, CollectIterable.this.function.valueOf(objectParameter));
            }
        });
    }

    @Override
    public long injectInto(long injectedValue, final LongObjectToLongFunction f)
    {
        return Iterate.injectInto(injectedValue, this.adapted, new LongObjectToLongFunction()
        {
            public long longValueOf(long intParameter, T objectParameter)
            {
                return f.longValueOf(intParameter, CollectIterable.this.function.valueOf(objectParameter));
            }
        });
    }

    @Override
    public double injectInto(double injectedValue, final DoubleObjectToDoubleFunction f)
    {
        return Iterate.injectInto(injectedValue, this.adapted, new DoubleObjectToDoubleFunction()
        {
            public double doubleValueOf(double intParameter, T objectParameter)
            {
                return f.doubleValueOf(intParameter, CollectIterable.this.function.valueOf(objectParameter));
            }
        });
    }

    @Override
    public float injectInto(float injectedValue, final FloatObjectToFloatFunction f)
    {
        return Iterate.injectInto(injectedValue, this.adapted, new FloatObjectToFloatFunction()
        {
            public float floatValueOf(float intParameter, T objectParameter)
            {
                return f.floatValueOf(intParameter, CollectIterable.this.function.valueOf(objectParameter));
            }
        });
    }

    @Override
    public V getFirst()
    {
        if (this.isEmpty())
        {
            return null;
        }
        return this.function.valueOf(Iterate.getFirst(this.adapted));
    }

    @Override
    public V getLast()
    {
        if (this.isEmpty())
        {
            return null;
        }
        return this.function.valueOf(Iterate.getLast(this.adapted));
    }
}