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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 2012 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.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.Predicates;
import com.gs.collections.impl.block.procedure.IfObjectIntProcedure;
import com.gs.collections.impl.block.procedure.IfProcedure;
import com.gs.collections.impl.block.procedure.IfProcedureWith;
import com.gs.collections.impl.lazy.iterator.SelectInstancesOfIterator;
import com.gs.collections.impl.utility.Iterate;
import net.jcip.annotations.Immutable;

/**
 * A SelectIterable is an iterable that filters a source iterable for instances of a Class as it iterates.
 */
@Immutable
public class SelectInstancesOfIterable
        extends AbstractLazyIterable
{
    private final Iterable adapted;
    private final Class clazz;

    public SelectInstancesOfIterable(Iterable newAdapted, Class clazz)
    {
        this.adapted = newAdapted;
        this.clazz = clazz;
    }

    public void forEach(Procedure procedure)
    {
        Iterate.forEach((Iterable) this.adapted, new IfProcedure(Predicates.instanceOf(this.clazz), procedure));
    }

    public void forEachWithIndex(ObjectIntProcedure objectIntProcedure)
    {
        Iterate.forEach((Iterable) this.adapted, new IfObjectIntProcedure(Predicates.instanceOf(this.clazz), objectIntProcedure));
    }

    public  void forEachWith(Procedure2 procedure, P parameter)
    {
        Iterate.forEachWith((Iterable) this.adapted, new IfProcedureWith(Predicates.instanceOf(this.clazz), procedure), parameter);
    }

    public Iterator iterator()
    {
        return new SelectInstancesOfIterator(this.adapted, this.clazz);
    }
}