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Stream API from Java 8 rewrited on iterators for Java 7 and below.

There is a newer version: 1.2.2

package com.annimon.stream;

import com.annimon.stream.function.BiConsumer;
import com.annimon.stream.function.Function;
import com.annimon.stream.function.Supplier;

/**
 * The Collector of stream data.
 * 
 * @param  the type of input elements to the reduction operation
 * @param  the mutable accumulation type of the reduction operation
 * @param  the result type of the reduction operation
 * @see Stream#collect(com.annimon.stream.Collector)
 */
public interface Collector {
    
    /**
     * Function provides new containers.
     * 
     * @return {@code Supplier}
     */
    Supplier supplier();
    
    /**
     * Function folds elements into container.
     * 
     * @return {@code Supplier}
     */
    BiConsumer accumulator();
    
    /**
     * Function produces result by transforming intermediate type.
     * 
     * @return {@code Function}
     */
    Function finisher();
}