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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 2011 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.procedure.Procedure;
import com.gs.collections.api.block.procedure.Procedure2;
import com.gs.collections.api.block.procedure.primitive.ObjectIntProcedure;
import com.gs.collections.impl.Counter;
import com.gs.collections.impl.lazy.iterator.FlatCollectIterator;
import com.gs.collections.impl.utility.Iterate;
import net.jcip.annotations.Immutable;

@Immutable
public class FlatCollectIterable
        extends AbstractLazyIterable
{
    private final Iterable adapted;
    private final Function> function;

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

    public void forEach(final Procedure procedure)
    {
        Iterate.forEach(this.adapted, new Procedure()
        {
            public void value(T each)
            {
                Iterate.forEach(FlatCollectIterable.this.function.valueOf(each), procedure);
            }
        });
    }

    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
        final Procedure innerProcedure = new AdaptObjectIntProcedureToProcedure(objectIntProcedure);
        Iterate.forEach(this.adapted, new Procedure()
        {
            public void value(T each)
            {
                Iterable iterable = FlatCollectIterable.this.function.valueOf(each);
                Iterate.forEach(iterable, innerProcedure);
            }
        });
    }

    public  void forEachWith(final Procedure2 procedure, final P parameter)
    {
        Iterate.forEach(this.adapted, new Procedure()
        {
            public void value(T each)
            {
                Iterate.forEachWith(FlatCollectIterable.this.function.valueOf(each), procedure, parameter);
            }
        });
    }

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

    private static final class AdaptObjectIntProcedureToProcedure implements Procedure
    {
        private static final long serialVersionUID = 1L;

        private final Counter index;
        private final ObjectIntProcedure objectIntProcedure;

        private AdaptObjectIntProcedureToProcedure(ObjectIntProcedure objectIntProcedure)
        {
            this.objectIntProcedure = objectIntProcedure;
            this.index = new Counter();
        }

        public void value(V each)
        {
            this.objectIntProcedure.value(each, this.index.getCount());
            this.index.increment();
        }
    }
}